Вибрация на кузов от двигателя: причины, почему появились, что если передается на кузов

Основные причины появления вибрации в работе автомобиля

Практически каждый автовладелец может столкнуться с такой неприятной проблемой, как повышение вибрации машины. При появлении такого дефекта водителю необходимо как можно быстрее обратиться за помощью в автосервис, чтобы своевременно решить проблему и избежать более серьезной поломки транспортного средства в дальнейшем.
Вибрация отрицательно влияет не только на общее состояние автомобиля, но и оказывает негативное воздействие на водителя и его пассажиров. В кузове могут со временем появиться трещины, гайки и винты постепенно начинают раскручиваться, что приводит к разрушениям и аварийным ситуациям.

Причины вибрации во время движения

Подобные толчки могут проявляться из-за дисбаланса ходовой части автотранспорта, а служить этому может ряд причин:

1. Конструктивные. Нарушение конструкции какой-либо автодетали меняет балансировку, например, деформация дисков колеса.
2. Технологические. Несоответствие размеров установленных новых элементов к заводским параметрам. К примеру, вес недавно установленного шатуна отклоняется от стандартных значений, вследствие чего нагрузка в моторе распределяется асимметрично, что вызывает вибрационные толчки в процессе движения автомобиля.
3. Эксплуатационные. Неравномерный износ составных частей и их деформация, потеря виброизоляционных свойств из-за поломки или сильного износа подушек крепления мотора, предназначенных для снижения силы ударов от двигателя к кузову.

В случае постоянной вибрации, необходимо провести диагностику автомобиля, после которой специалистом будут выявлены причины возникновения неполадок и предложены способы их ликвидации.

Довольно часто тряска кузова появляется при разгоне. Факторов, влияющих на данный показатель достаточно много.
Когда на скорости в авто ощущаются какие-либо колебания, незамедлительно стоит определить причины их появления.

Для этого выполняют ряд действий:

1. Осматривают колеса. Зачастую вибрация проявляется на скорости 100 км/ч и выше. Если до этого вы побывали в ДТП, при котором был задет колесный диск, то именно из-за его деформации может возникнуть дисбаланс, либо спали балансировочные грузики. Потребуется балансировка колес в автоцентре.
2. Определяют состояние развала-схождения. Данную проблему можно легко обнаружить, стоит лишь визуально осмотреть покрышки. Если внешняя и внутренняя стороны изношены неравномерно и сильно инертны, то пора проводить процедуру регулировки сход-развала колес.
3. Проверяют качество и состояние шин. Очень жесткая и некачественная резина способна вызвать тряску даже на минимальной скорости. А для того чтобы понять действительно ли являются покрышки причиной возникновения неполадок в работе авто следует поменять передние шины и задние местами. Однако лучше всего в такой ситуации обратиться в автосервис, где специалист проведет все необходимые манипуляции и устранит неполадки.
4. Проводят диагностику ходовой части, проверяют:

• стойки и амортизаторы подвески. При истирании данных запчастей авто будет вибрировать от малейшей кочки, поэтому выход один – их замена на новые детали;
• шаровые опоры. При их амортизации появляется люфт, который и вызывает вибрацию, поэтому обязательно отслеживайте состояние этих элементов и их срок службы;
• ШРУСы. Они всегда должны быть в целостности, при возникновении малейшего люфта (обнаружить его можно с помощью прокрутки вала), их обязательно стоит заменить.

5. Исключают вероятность иных поломок. Осмотру подлежат:

Причины вибрации при разгоне: как их ликвидировать?

Когда автомобиль «дрожит» при разгоне, стоит насторожиться, ведь это может привести к достаточно серьезным последствиям.

Причинами такого «недуга» машины чаще всего являются:

• низкий уровень масла в коробке передач. Начинает вибрировать не только двигатель, но и транспорт в целом. Чтобы понять, что причина тряски заключается  в этом, стоит разогнаться до скорости, на которой вы ощутите вибрацию и при нажатии на педаль акселератора, динамика будет снижаться. Если это подтверждается, то проблема решается легко, стоит лишь повысить уровень масла;
• засорение фильтра коробки передач. В машинах с автоматической коробкой передач, тряску при разгоне может вызвать засорение фильтра, особенно на высоких скоростях. Проблема решается элементарной заменой фильтра;
• износ карданного шарнира (вала). При начале движения автомобиля может появиться сильная вибрация в карданном вале. Выходом из такой ситуации станет установка нового вала или замена подшипников крестовины. Лучше своевременно заменить один элемент, чем потом платить за достаточно дорогой ремонт всего автомобиля. Это касается только машины с ручной коробкой передач, если же установлена коробка-автомат, то вначале необходимо проверить ее составляющие элементы.

Автомобильная вибрация – это всегда нехороший вестник, поэтому при малейших подозрениях на ее появление, как можно скорее обращайтесь к опытным специалистам в автомастерскую.

Профессиональные услуги по обслуживанию и ремонту авто любой сложности предоставляют в автосервисе «Заречный», одном из крупнейших в Щелково. Наши мастера всегда рады предоставить квалифицированную помощь и провести: диагностику, рихтовку, сход-развал, слесарные и малярные работы с индивидуальным подбором краски, ремонт двигателя, тормозной и выхлопной систем, электрооборудования и иных агрегатов. У нас доступные цены, высокое качество обслуживания, современные инструменты и оборудование.

Посетить автосервис «Заречный» вы сможете по адресу: г. Щелково, ул.Заречная, 84.

Вибрация в автомобиле: видео

Вибрация в автомобиле, ее причины и способы устранения:

 

90000 Diagnosing Causes of Steering & Suspension Vibration 90001 90002 The song «Good Vibrations» by the Beach Boys may have been a big hit in its day, but there’s no such thing as good vibrations or noise when it is coming from your vehicle’s suspension. Suspension vibrations are annoying and may be a warning signal that something is amiss. So do not ignore such symptoms. Investigate any unusual noises or car vibrations immediately to determine the cause. 90003 90002 Most suspension vibrations and noises can be classified according to when they occur: 90003 90002 * Engine speed sensitive — The vibration / noise is directly related to engine speed and nothing else (not vehicle speed or driving conditions).The symptom appears or changes in direct proportion to engine rpm. 90003 90002 * Vehicle speed sensitive — The vibration / noise only occurs at certain speeds or changes in direct proportion to vehicle speed. 90003 90002 * Acceleration / deceleration sensitive — The vibration / noise is only noticed when vehicle speed changes (as when starting out from a stop, passing, slowing down or coasting). 90003 90002 * Random — The vibration / noise comes and goes with no obvious connection to engine rpm, vehicle speed or driving conditions.90003 90014 SUSPENSION VIBRATION DIAGNOSIS 90015 90002 The first diagnostic step is to figure out exactly what’s going on. Focus on the driving conditions that accompany the vibration or sound. Does it only occur under certain driving conditions? If so, when? Does it change with vehicle speed? When is the problem most noticeable? When did you first notice the problem? Is it a noise (sound only), or vibration, or both? Where does the noise or vibration seem to be coming from? Can you feel it in the steering wheel, seat or both? «90003 90002 Next, take the vehicle for a test drive, and try to duplicate the operating conditions that create the vibration or noise.This will confirm the problem and hopefully give you a clearer picture of what exactly is happening. 90003 90002 * A vibration that appears above a certain vehicle speed should point you in the direction of the wheels, driveline and suspension. Because the list of potential causes is a long one, do not jump to conclusions until you’ve performed some preliminary checks. 90003 90002 * A vibration or noise that only occurs when accelerating or coasting typically indicates a problem in the driveline or chassis.90003 90002 * A vibration or a noise that depends on engine rpm alone should tell you to look in the engine compartment. 90003 90002 * Random noises and vibrations that come and go are often a clue that something is loose or broken and is rattling around. 90003 90014 SPEED SENSITIVE VIBRATIONS 90015 90002 Nine out of ten times, speed-sensitive vibrations are due to an out-of-balance wheel. But what about the tenth time when balancing does not cure the shakes? Is it a bent rim, an out-of-round rim or tire, an off-center wheel or hub, or a bent or imbalanced driveshaft? Sometimes the problem is worn shocks or a loose part in the suspension or steering linkage.90003 90002 Most tire / wheel imbalance problems will make themselves evident at speeds above 45 to 50 mph. A back-and-forth shimmy in the steering wheel means one or both front wheels are dynamically imbalanced, or a rim is bent. A simple bubble balancer can not address either of these. 90003 90002 An off-car electronic spin balancer will check both static and dynamic balance of the tire and wheel assembly. Some balancers can also check radial and lateral runout. But off-car balancers only do the tire and wheel assembly.They do not take into account brake rotors or drums that may be out of balance. So when a vibration problem does not go away even though the wheels have been rebalanced, it should tell you the balance problem is probably on the vehicle. 90003 90002 First, try re-indexing the rotor one or two lug positions on the hub to see if that reduces the imbalance. If there is no change, the rotor may need to be balanced or replaced. 90003 90002 Or, use an on-car balancer to balance the wheel on the car.Unfortunately, a conventional on-car spin balancer can not be used on most vehicles with FWD or fulltime all-wheel drive (AWD) because spinning the wheel with the suspension unsupported risks damaging the CV joint. Also, if a FWD or AWD vehicle has any type of limited-slip differential (including the viscous clutch type), you can not spin just one wheel. For these kind of balance problems, you may need an off-car balancer that can also detect force variations in the tire. 90003 90002 Variations in the stiffness of the sidewall, particularly in low profile tires, can have the same effect as excessive radial runout as the tire rolls down the highway.Match mounting the tire on the rim with the stiffest point on the tire over the lowest point on the rim may reduce the effect of force variation. If not, the tire may have to be replaced. 90003 90002 Vibrations caused by out-of-round tires or wheels, bent rims or excessive hub runout can be diagnosed on the vehicle with a dial indicator, or on a wheel balancer that has this capability. Minor runout problems can be corrected by tire matching (lining up the high and low spots on the wheel and tire to minimize runout) or tire truing (shaving the tire to make it rounder, another job that requires special equipment).90003 90002 As a rule, most hubs with sealed wheel bearing assemblies should have less than .002 inches of runout. More than that may cause a vibration and / or tell you the bearing is failing. 90003 90002 A sawtooth or heel-and-toe wear pattern on the tires can also produce vibrations and noise that may be speed sensitive. This type of wear is common on the rear tires of some front-wheel drive cars, and may be caused by a toe-out condition on one or both rear wheels. Not rotating the tires often enough can also cause unusual wear patterns to develop on the rear tires of many front-wheel drive cars.Run your hand around the rear tires to feel for roughness. If the tread blocks are worn unevenly, you’ll probably feel ridges one way but not the other. The fix here is to replace the worn tires and realign the rear wheels. 90003 90014 DRIVESHAFT VIBRATIONS 90015 90002 If the wheels are in balance, the rims are not bent and the tires are round — and the car still shakes — the imbalance may be in the driveshaft. This would be more likely on a rear-wheel drive vehicle than a FWD car.Here’s why. 90003 90002 FWD driveshafts turn at the same speed as the wheels. At 55 mph, a typical FWD driveshaft may only be turning at 800 rpm — which is not fast enough to cause a vibration unless the shaft is bent or severely out of balance. Because of this, most FWD driveshafts are not balanced at the factory (unlike RWD shafts), nor is runout as critical. Maximum runout for a RWD driveshaft is generally .010 inches. For FWD, twice as much runout is considered acceptable. 90003 90002 On some FWD driveshafts, a «vibration damper» weight is used to control torsional vibrations.If the weight has been removed or lost, it may cause cyclic vibrations to occur at certain speeds. 90003 90002 Worn U-joints on RWD driveshafts can cause vibrations at any speed as can an incorrectly installed U-joint. A worn U-joint (or inner CV joint in FWD applications) will usually «clunk» when the transmission is put into gear or when changing speed abruptly. A bad U-joint may also emit a cyclic chirp when starting out from a dead stop. 90003 90002 Cyclic vibrations can also be caused by excessive driveshaft angle.This may be a problem if somebody has raised or lowered the stock ride height of the vehicle by more than several inches. It’s a common problem on 4×4 trucks that have been raised excessively with a lift kit. When a U-joint runs at an angle of more than a few degrees, the geometry of the joint induces cyclic vibrations in the shaft. The greater the angle, the stronger the intensity of the vibrations. 90003 90002 With FWD, bad CV joints usually do not vibrate but they do click. The best way to check for worn outer joints is to turn the steering wheel to one side, then put the car in reverse and accelerate backwards.Running the joint in the opposite direction to which it normally turns exaggerates any wear that might be present. 90003 90002 Bad wheel bearings will usually make themselves evident before they fail. If you hear a whining, squeaking, chirping or grumbling noise that seems to be coming from a wheel, better check the bearings. 90003 90014 RESONANCE 90015 90002 One of the most annoying sources of noise and vibration, and one that is sometimes confused with wheel vibration, is that caused by resonant vibration in the exhaust system.At certain speeds, the natural oscillations that occur in the exhaust may «stack up» causing the exhaust system to buzz or resonate. The problem may be due to a change in the exhaust system (replacing the muffler or tailpipe with one that differs from the original equipment design), a bent or mislocated pipe (which touches the chassis) or a broken or bent pipe hanger. 90003 90002 «Tuning» weights are also attached to the transmission tailshaft, differential or rear axle mounts on some vehicles to dampen chassis and drivetrain vibrations.A spring has a natural frequency at which it wants to oscillate. If that frequency happens to fall within the range of normal driving, the factory engineers (if they catch it) may add a little weight to the suspension component to alter its frequency. If the original weights have been removed or are missing, an annoying vibration or shake may result at certain speeds or when driving on rough roads. 90003 90014 ACCELERATION / COAST VIBRATIONS & NOISE 90015 90002 Clunks, groans and squeaks that only occur during acceleration, deceleration, sudden speed changes or when encountering bumps usually point to loose, worn or deteriorated suspension components.Check the control arm bushings, ball joints, sway bar mounts and shocks. 90003 90002 If a car shakes or shudders after hitting a bump or on rough roads, it usually indicates worn shocks. On cars or trucks equipped with a hydraulic steering stabilizer, a bad stabilizer can cause the same kind of symptom. 90003 90002 Excessive backlash in the differential gears, or worn bearings or gears in the transmission or transaxle will typically make a whining noise that’s loudest during deceleration, but rarely cause a vibration.If you detect audible gear noise, check the lube levels in the differential, transmission or transaxle. 90003 90002 A shudder that comes and goes with changing vehicle speed can sometimes be traced to a lockup torque converter that is engaging and disengaging. Such problems may be caused by a bad vehicle speed sensor, MAP sensor, engine computer or TCC solenoid. 90003 90014 RPM REVERBERATIONS 90015 90002 A vibration that comes and goes with changing engine speed can be due to a broken or collapsed motor mount, by loose or broken engine accessories, or sometimes by loose or worn drive belts.Vibrations can be transmitted to the chassis or body by metal-to-metal contact at the mount, by an exhaust pipe or manifold making contact with the chassis, steering linkage or suspension, or by an engine-driven accessory (A / C compressor, alternator, etc.) making contact. 90003 90002 To rule out a broken motor mount, check for signs of physical contact (scuff marks, shiny spots, etc.) between the engine, transmission, transaxle or exhaust system and the rest of the vehicle. The integrity of the motor mounts can be checked by prying up on the engine and transmission or transaxle.90003 90002 On rear-wheel drive vehicles, the rubber insulator that holds the left motor mount together is often loose because torque twists the engine away from the mount and eventually rips it apart. Additional symptoms that would point to this problem often include a clunk or shudder during hard acceleration or when the transmission is put into gear. 90003 90002 On front-wheel drive applications with transverse-mounted engines, the upper «torque strap» or motor brace is often the one that suffers the most as a result of engine torque.The combination of heat, vibration and oil contamination can cause the rubber bushings to deteriorate. The result can be an engine that bucks, shakes and rattles when accelerating or shifting. Transverse-mounted engines roll quite a bit during hard acceleration, so bad motor mounts are fairly common. 90003 90002 If a bolt works loose on an automatic transmission torque converter, it can create an imbalance that increases in intensity with higher rpms. To check for this condition, drop the inspection plate on the bellhousing and crank the engine while watching for missing or loose bolts.90003 90014 RANDOM NOISES & VIBRATIONS 90015 90002 Loose shock absorbers, spring mounts, ball joints, stabilizer bars, control arm bushings, poorly hung exhaust systems, etc. can all make clunks or rattles when starting from a dead stop, when braking or when cornering, or when traveling over rough roads. If there is also looseness in the steering, the tie rod ends, idler arm or steering rack mounts may be bad. In any event, get the vehicle up in the air and thoroughly inspect the steering and suspension.90003 90002 An often overlooked cause of suspension noise may be a loose spare tire or other items in the trunk area. 90003 90002 Exhaust rattles and / or vibrations may also be transmitted through the chassis and feel like something else. To rule out this possibility, inspect the exhaust with the engine running and the vehicle on a lift. 90003 90100 90101 90102 90103 90104 SUSPENSION NOISE & VIBRATION DIAGNOSTIC CHART 90105 90106 90002 CAUSES RELATED TO VEHICLE SPEED: 90003 90002 * Wheel / tire imbalance 90003 90002 * Bent rim 90003 90002 * Out-of-round tire and / or rim 90003 90002 * Driveshaft imbalance (RWD primarily) 90003 90002 * Driveshaft bent 90003 90002 * Defective or misaligned U-joint 90003 90002 * Defective CV joint 90003 90002 * Excessive driveshaft angle (4×4 trucks) 90003 90002 * Worn wheel bearings 90003 90002 * Exhaust vibration 90003 90002 * Missing chassis / drivetrain damper weights 90003 90106 90002 CAUSES RELATED TO ACCELERATION, DECELERATION & SPEED CHANGES: 90003 90002 * Worn differential / transmission / transaxle gears or bearings 90003 90002 * Loose / worn suspension components 90003 90002 * Engine vacuum leaks 90003 90002 * Exhaust backfiring 90003 90002 * Torque converter clutch lockup & release 90003 90002 * Loose / broken motor, transmission or transaxle mounts 90003 90106 90002 CAUSES RELATED TO ENGINE RPM: 90003 90002 * Loose / broken motor mounts 90003 90002 * Engine misfire 90003 90002 * Loose / broken accessory mounting bracket 90003 90002 * Defective accessory shaft bearings 90003 90002 * Damaged cooling fan or clutch 90003 90002 * Loose / worn V-belt 90003 90002 * Defect in power steering system 90003 90002 * Loose / missing torque converter bolts 90003 90165 90166 90167.90000 Human vibration, hand-arm vibration, whole body vibration 90001 90002 Human exposure to whole-body vibration should be evaluated using the method defined in ISO 2631-1. Whole-body vibration is applicable to motions transmitted from workplace machines and vehicles to the human body through a supporting surface. For health and safety evaluations, this is through the buttocks and feet of a seated person or the feet of a standing person. 90003 90002 When carrying out whole-body measurements, it is preferable to measure over the entire exposure time.If that is not possible or necessary, measurements should be made over periods of at least 20 minutes. Where short measurements are necessary, they should be at least three minutes long and should be repeated to achieve a total measurement time of more than 20 minutes. Longer measurements of 2 hours or more are preferable (half or full working day measurements are sometimes possible). 90003 90002 When assessing whole-body vibrations, acceleration should be picked up at the seat surface for a seated person or underneath the feet of a standing person.The accelerometer should be placed in a Seat Pad, which is preferably fixed to the floor or seat using tape or a strap to ensure that the accelerometer remains at the desired position and is able to withstand any position changes of the driver or operator of a machine . However, for correct results, the Seat Pad must be loaded during the measurement by the worker, who should stand or sit on the pad. 90003 90002 RMS vibration magnitude, Peak value, MTVV and VDV of the frequency-weighted acceleration should be measured simultaneously in all three directions, where Z-direction is always along the main body axis (i.e., for measurements at the feet and seat it is vertical to the seat and floor plane), the X-direction is aligned with the fore-and-aft motion and the Y-direction with a side-to-side motion. 90003 90002 In contrast to hand-arm vibration assessment, frequency weightings are different for X, Y, and Z-direction. In the context of health risk assessment, when measuring whole-body vibration at the feet and seat, ISO 2631-1 requires the use of Wk in the Z-direction, whereas Wd is used for the acceleration in the X and Y directions 90003 90002 Whole-body vibrations are measured with the help of the so-called seat sensor, where we need to install the triaxial sensor in the rubber adapter on which we sit.It is important that the z-axis is in a vertical direction since it is weighted differently than x and y. 90003 90014 Image 4: Seat pad sensor 90002 Vibration should always be evaluated by measuring the weighted vibration acceleration. Crest factor determines the method for evaluation of vibration. In the case of a high crest factor (greater than 9) to evaluate the vibration running RMS or VDV should be used. Using the vector sum (total vibration value) is recommended for the evaluation of comfort and health risk assessment if the vibration in two or three axes are comparable.90003 90002 For an assessment of occasional shocks and short-term vibration, the running RMS is used. In this case, the maximum value in the observation time is called as MTVV and is defined as the maximum instantaneous vibration magnitude. Vibration transmitted to the human body should be measured at a point between the body and the vibrating surface. In the case of a sitting person, this will be a seat, the seat back or the floor under feet. 90003 90002 Vibration should be measured according to the axis direction that begins at the point of human contact with the vibrating surface.The vertical axis (Z) should follow the orientation of the body, so the Z axis does not necessarily have to be vertical. The direction of the axis must be specified in the report. 90003 90002 The duration of the measurement shall be sufficient to ensure statistical accuracy and should take into account the typical vibration exposure. Measuring time should also be included in the report. The health of sitting persons is affected by vibrations in the frequency range of 0.5 Hz to 80 Hz. Measurements should be made using the appropriate frequency weightings: the Wk (Z-axis) and the Wd (axes X, Y).Because horizontal vibration is more harmful, the weighting coefficients should be 1.4 for the X, Y and 1 for the Z axis. Weighted RMS should be assessed in each of the 3 directions on the seat surface. In special cases, other weightings, such as Wc, Wf, We, Wj should be used. 90003 90002 Whole-body vibration should be evaluated on the basis of the result of the daily dose of A (8) expressed as equivalent frequency-weighted acceleration within eight hours, and calculated as the highest value of RMS or VDV determined in three axes X , Y, Z.90003 90002 0 90003 Advanced issue found 90002 ▲ 90003 90029 Image 5: Different measurement positions at whole-body vibration measurement 90002 90003 90002 Based on the frequency-weighted acceleration signals, the daily vibration exposure is determined by calculating the exposure for each of the three axes separately and then selecting the highest of the three values. This necessitates an additional factor, 90033 ki 90034, that must be applied to the measured vibration values. For the X and Y-direction, the factor is 1.4. For the Z-direction, the factor is 1.0: 90003 90002 90003 90002 The maximum of these three values ​​will then be the daily vibration exposure: 90003 90002 90003 90002 This is significantly different than the procedure used to determine hand-arm vibration exposure , where the three axes were combined to a single, total vibration value. However, according to ISO 2631-1, Section 6.5, a vibration total value may be used if no dominant axis of vibration can be found. The vibration total value for whole body vibration is calculated according to the following equation: 90003 90002 90003 90002 In some countries, different exposure limit values ​​are given for different axes.Therefore, a paradox may occur such that, while the axis with the largest exposure value will not be found critical, another axis with a smaller exposure value will be above the limit for this axis. The report, based on the axis with the highest value, would not indicate a risk, even though the limit is violated for another axis. 90003 90002 If a worker is exposed to more than one source of vibration, the partial vibration exposure Aj, i (8), for each axis and operation 90033 i 90034, is to be calculated first: 90003 90002 90003 90002 The partial vibration exposures are then added for each of the three axes separately, and the total daily vibration exposure is found as the maximum of these three sums: 90003 90002 90003 90002 The total daily vibration dose, A (8), applies well if the vibration history is rather smooth , free of shocks or other sudden changes or peaks in the acceleration.However, when, for example, driving a vehicle over rough surfaces, such as found on construction sites and sandpits, shocklike events may occur and an assessment based on RMS values ​​may no longer be appropriate. The fourth power vibration dose value (VDV) has been developed to take such transients into account. Unlike RMS vibration magnitude, the measured VDV is a cumulative value it increases with the measurement time. It is, therefore, important for any measurement of VDV, to know the period over which the value was measured.Further, due to the fourth power, transients and peaks are given more weight in the integration. If the measurement time is shorter than the estimated exposure time, the measured VDV must be expanded to the actual exposure time: 90003 90002 90003 90002 Where T 90063 meas 90064 is the measurement period and T 90063 exp 90064 is the full expected exposure time, and note again the k-factors (1.4, 1.4 and 1.0). Further, if a person is exposed to more than one vibration source, the total VDV is to be calculated from the partial vibration dose values ​​for each axis: 90003 90002 90003 90002 The highest of the three individual VDVs gives the daily VDV.90003 90002 Another useful quantity when investigating human vibration with transients is the running RMS. It has a short integration time of 1 s and thus, is well suited to indicate the magnitude of short events. The so-called maximum transient vibration value (MTVV) represents the maximum running RMS value found over one measurement period. 90003 90002 ISO 2631-1 provides some guidelines concerning when it is recommended to consider VDV, running RMS and MTVV instead of the vibration magnitude, aw: 90003 90076 90077 If, VDV should be considered in addition to RMS 90078 90077 If, MTVV should be considered in addition to RMS 90078 90077 If, VDV should be considered in addition to RMS 90078 90083 90002 If one of these conditions is given, it indicates that the vibration history had peaks significantly above the general average vibration level.90003 90002 The ratio between the Peak value and RMS vibration magnitude, the crest factor (CF), is considered to be a rather uncertain criterion because the peak may have occurred at a different time ranging from minutes to hours before or after the vibration event that determined the RMS. 90003 .90000 Is it MS, Parkinson’s, or Something Else? 90001 90002 Internal vibrations are like tremors that happen inside your body. You can not see internal vibrations, but you can feel them. They produce a quivering sensation inside your arms, legs, chest, or abdomen. 90003 90002 Internal vibrations are not as life-altering as external tremors. For example, you will not physically shake while trying to pour a cup of tea or write a letter. Internal vibrations also are not the same as vertigo, which is another symptom of some neurological conditions.Vertigo feels like the world is spinning around you. 90003 90002 Still, internal tremors can feel unpleasant. And because they are not visible, these tremors can be hard to explain to your doctor. Keep reading to learn more about possible causes for your internal tremors and next steps. 90003 90002 Tremors are caused by damage in your brain affecting the nerves that control your muscles. Internal vibrations are thought to stem from the same causes as tremors. The shaking may simply be too subtle to see.90003 90002 Nervous system conditions such as Parkinson’s disease, multiple sclerosis (MS), and essential tremor can all cause these tremors. One study reported that 33 percent of people with Parkinson’s disease had internal vibrations. Thirty-six percent of people with MS and 55 percent of people with essential tremor also reported feeling internal vibrations. Sometimes, anxiety can cause or worsen the tremors. 90003 90002 Most people with internal tremors also have other sensory symptoms, such as aching, tingling, and burning.The other symptoms you have with the vibrations can give clues to which condition you have. 90003 90002 Symptoms of Parkinson’s disease include: 90003 90016 90017 tight muscles that are hard to move 90018 90017 slow, shuffling, stiff movements 90018 90017 small handwriting 90018 90017 quiet or hoarse voice 90018 90017 loss of your sense of smell 90018 90017 serious look on your face, called a mask 90018 90017 trouble sleeping 90018 90017 constipation 90018 90017 dizziness 90018 90035 90002 Symptoms of essential tremor include: 90003 90016 90017 small movements of the arms and legs, especially when you are active 90018 90017 head nodding 90018 90017 twitching in your eyelids and other parts of your face 90018 90017 quivering or shaky voice 90018 90017 trouble with balance 90018 90017 problems writing 90018 90035 90002 Symptoms of MS include: 90053 90003 90016 90017 numbness in your arms, legs, face, and body 90018 90017 stiffness 90018 90017 weakness 90018 90017 fatigue 90018 90017 trouble walking 90018 90017 dizziness and vertigo 90018 90017 blu rred vision or other sight problems 90018 90017 trouble controlling urination or bowel movements 90018 90017 depression 90018 90035 90002 If you’re having internal vibrations, see your primary care doctor for an exam.Also make an appointment if you have symptoms such as: 90003 90016 90017 numbness 90018 90017 weakness 90018 90017 trouble walking 90018 90017 dizziness 90018 90035 90002 Your doctor will start by asking about your symptoms and medical history. You’ll have tests done to check for signs of neurologic conditions that can cause tremors. Your doctor will ask you to perform a series of tasks. These can test your: 90003 90016 90017 reflexes 90018 90017 strength 90018 90017 muscle tone 90018 90017 feeling 90018 90017 movement and walking ability 90018 90017 balance and coordination 90018 90035 90002 The doctor may also order one or more of these tests: 90003 90016 90017 electromyogram, which measures how well your muscles respond to stimulation 90018 90017 evoked potential tests, which use electrodes to measure how well your nervous system responds to stimulation 90018 90017 lumbar puncture (spinal tap), which removes a sample of fluid from around your spinal cord to look for signs of MS 90018 90017 magnetic resonance imaging (MRI) scan, which shows lesions in your brain and spinal cord 90018 90035 90002 Your doctor might refer you to a neurologist.A neurologist is a specialist who treats disorders of the nervous system. 90003 90002 90118 Read more: Tests for multiple sclerosis »90119 90003 90002 To get the right treatment, first you need an accurate diagnosis. Sometimes internal vibrations will improve once you treat the condition that’s causing them. If your doctor can not figure out the reason for your tremors, you might need to see a specialist for more tests. 90003 90123 Drugs for an underlying condition 90124 90002 Parkinson’s disease is treated with carbidopa-levodopa (Sinemet), pramipexole (Mirapex), and ropinirole (Requip).These drugs increase the amount of dopamine in your brain or they mimic the effects of dopamine. Dopamine is a chemical messenger that helps your body move smoothly. 90003 90002 Essential tremor is treated with a type of blood pressure drug called a beta-blocker. It can also be treated with antiseizure drugs. 90003 90002 MS treatment depends on the type of MS and its progression. It may include steroids to bring down inflammation in the brain and spinal cord. Other treatments include disease-modifying drugs like interferon and glatiramer acetate (Copaxone).90003 90123 Drugs to control tremors 90124 90002 Certain medications can also specifically help control tremors. These drugs include: 90003 90016 90017 anticholinergic drugs like trihexyphenidyl (Artane) and benztropine (Cogentin) 90018 90017 botulinum toxin A (Botox) 90018 90017 tranquilizers such as alprazolam (Xanax) or clonazepam (Klonopin), if anxiety causes your tremors 90018 90035 90123 Other options 90124 90002 Working with a physical therapist can help you gain better muscle control, which may help with tremors.90003 90002 If other treatments have not worked, your doctor might recommend surgery. In a technique called deep brain stimulation (DBS), the doctor implants electrodes in your brain and a battery-operated generator in your chest. The generator delivers electrical pulses to parts of your brain that control movement. 90003 90002 Internal tremors are not dangerous. They can be uncomfortable enough to interfere with your daily life, however. Whether this symptom improves depends on what’s causing the tremors and which treatment you get.90003 90002 Finding the right treatment might involve some trial and error. If the first medication you take does not work, go back to your doctor. See if you can try something else. The tremor might not go away entirely, but you may be able to control it enough that it no longer bothers you. 90003 90002 A tremor that no one can see can be hard to describe to your doctor. To help you explain this symptom, start keeping a diary of your tremors. Write down: 90003 90016 90017 at what time of the day they happen 90018 90017 what you were doing when they started 90018 90017 what they feel like 90018 90017 how long they last 90018 90017 what other symptoms you have with them, such as dizziness or weakness 90018 90035 90002 Bring this diary with you to your appointments.Use it as a guide during conversations with your doctor. 90003.90000 How our body ‘listens’ to vibrations — ScienceDaily 90001 90002 We all know the feeling of a mobile phone vibrating in our hands when announcing an incoming call. If we perceive these vibrations so clearly, it is due to specialized receptors that transduce them into neural signals sent to our brain. But how does the latter encode their physical characteristics? To understand this, neuroscientists from the University of Geneva (UNIGE) have observed what happens in the brains of mice whose forepaws perceive vibrations.They discovered that neurons in the somatosensory cortex are activated in a manner similar to those in the sound-reactive auditory cortex. These results, published in the journal 90003 Nature 90004, suggest that feeling a phone vibrate or hearing it ring is ultimately based on the same brain codes. 90005 90002 If you place a glass of water on your desk, you can probably see on its surface the concentric oscillatory motions created by the small movements that occur nearby. These oscillations are caused by vibrations that propagate through the floor, desk, glass and all other solid surfaces.These vibrations are also important sensory stimuli that we use to detect, for example, an approaching train or to identify the familiar step of our office neighbour. «We live surrounded by vibrations that are extremely important in how we perceive the world,» explains Daniel Huber at the Department of Basic Neurosciences at the UNIGE Faculty of Medicine, who led this work. «So we wanted to know how the brain perceives and represents them.» 90005 90002 90009 A combination of frequency and amplitude 90010 90005 90002 Using two-photon microscopy, Daniel Huber’s team visualized the activity of hundreds of neurons in a mouse’s somatosensory cortex as vibrations of different frequencies were delivered to its forepaw.Like in the auditory cortex, individual neurons were selectively tuned: they strongly responded to some frequencies and less so to others. «It turns out that these neurons are preferentially tuned to a specific combination of frequency and amplitude, and that this combination corresponds to what the mouse actually perceives. In other words, a mouse is unable to distinguish a high-frequency vibration with a low amplitude from a low-frequency vibration with a higher amplitude, «explains Mario Prsa, a researcher in Dr.Huber’s team and the study’s first author. «It is the same psychoacoustic effect detected in the auditory system, where the perceived pitch of a sound changes with both frequency and loudness.» Thus, despite the fact that sounds — which travel through the air — and vibrations — which are transmitted through solid matter — are processed by different sensory channels, they are both perceived and encoded similarly in the brain. 90005 90002 90009 Everything goes through Pacinian corpuscles 90010 90005 90002 In a second step, the researchers sought to identify the origin of the somatosensory stimuli involved by performing a detailed histological analysis of Pacinian corpuscles in mouse forelimb.Pacinian corpuscles are known to transduce high frequency vibrations in mammals and are densely expressed in the dermis of primate fingertips. «Surprisingly, we found that the vibration responses in the mouse brain stem from Pacinian corpuscles located on the forearm bones, whereas they were totally absent in the paw’s skin,» explains Géraldine Cuenu, a student in the UNIGE master’s programme in neurosciences, who took charge of this detailed analysis. Using optogenetics, the scientists confirmed the link between cortical responses and the particular configuration of mechanoreceptors in the forelimbs.90005 90002 90009 An ancestor of the hearing system? 90010 90005 90002 Could it be that the particular distribution of vibration-sensitive mechanoreceptors along the bones of the forelimb acts as a seismograph to «listen» to vibrations? Vibratory stimuli are indeed used by a number of living organisms to communicate through plants, branches and other solid substrates. «Our discoveries probably reveal the existence of an ancient sensory channel, which could be an evolutionary precursor of hearing,» concludes Mario Prsa.This somewhat vestigial, yet highly sensitive modality might also explain how we are able to identify subtle clues linked to upcoming natural disasters, or why construction or traffic causes nuisances even when inaudible. 90005 90002 90009 Story Source: 90010 90005 90002 Materials provided by 90009 Université de Genève 90010. 90003 Note: Content may be edited for style and length. 90004 90005 .