Why Does a Car Make a Thumping Sound When Driving on Rough Roads?
1 Answers
Generally, the most common source of abnormal noises on bumpy roads is the vehicle's chassis. If the chassis makes clunking sounds on rough roads, the first step is to inspect the car's shock absorbers. Based on the location of the sound, identify the problematic area. When the car is parked on flat ground, the distance between the car and the ground is too small, making it difficult to inspect for faults. It is best to visit a 4S shop or repair shop and use a lift to raise the vehicle for inspection. Check if there are any gaps in the shock absorbers or if the suspension has any faults. If the shock absorber is leaking oil, it may be due to a faulty oil seal gasket, and the shock absorber may need to be replaced. When driving on bumpy roads, the car body may also produce abnormal noises, mainly due to the deformation and squeezing of the body caused by the rough surface. Examples include noises from the sunroof or doors. In such cases, it is necessary to clean the sunroof guide rails and lubricate them, as well as clean and lubricate the door seals. Precautions for Driving on Bumpy Roads According to normal driving habits, the typical speed on urban or rural roads is generally between 40-80 km/h. However, for obstacles like speed bumps, although there are no strict national regulations, industry standards usually specify a height of no more than 5 cm. From a design perspective, the safest speed to pass such obstacles should not exceed 20 km/h. If the speed exceeds 40 km/h, the comfort of the passengers may be affected. When the speed exceeds 60 km/h or even 80 km/h, the impact force on the car body can be several times or even more than ten times greater than at 20 km/h. Among the common speed-reducing obstacles, ranked from least to most damaging to the car body, conventional speed bumps are relatively low, cement speed bumps are the most damaging, and hard dirt mounds may fall somewhere in the middle to upper range.
