Analysis on the shock and vibration system of vehicle transportation

Generally speaking, the vibration with large amplitude and repetition frequency lower than the natural frequency of the vehicle, transmission and product as a whole is called shock.

From the perspective of the total time of the vehicle transportation process, this shock does not account for an important proportion, and it accounts for a small component in the effective value of the vibration acceleration, that is, essentially does not change the stability assumption during the transportation process. However, its magnitude is relatively large, and it can produce a stress exceeding its allowable on the vehicle and the products it transports, causing temporary or permanent damage to the vehicle or product. *Obvious examples are shocks caused by vehicles passing through pits on the road, crossing railroads, or falling during transportation.

Through measurement, it is shown that the factor that determines the impact damage potential energy is the impact of long duration and large amplitude. In other words, the rising speed of the shock pulse determines the potential energy of shock damage to some extent.

Because the vehicle and the products fastened on it constitute a complex vibration system, when it resonates with the road, it causes forced vibration. The vehicle or product will also generate high stress, which can exceed the allowable stress of the vehicle or product under certain conditions and cause damage. This situation should be distinguished from impact, but the transportation process is more of continuous low-overload stable random vibration. Therefore, the product transportation test is also a low-overload and long-term random vibration test. The damage caused by this is fatigue damage. For the above two environments, the entire transportation process exists simultaneously. But for products with different requirements, there are different treatment methods due to different focus points. For civilian products, due to its versatility and versatility, it is always unavoidable to be subject to instantaneous large overload impact during transportation, which is generally regarded as the main factor that causes product damage during transportation. Therefore, the shock response time curve is used as the original basis for transportation simulation. For military products, due to their speciality and specificity, various effective measures must be taken during the transportation process to avoid the impact environment of large overload. It is generally considered that the long-term random vibration of low overload is the main factor that causes product damage during transportation.

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