Vibration absorption device of adjustable natural frequency and engine with same

Abstract

The invention belongs to the technical field of vibration attenuation and vibration absorption of engineering structures and mechanical structures, and discloses a vibration absorption device of adjustable natural frequency and an engine with the same; wherein, the vibration absorption device of adjustable natural frequency is characterized by comprising a liquid storage tank, a liquid pump, a vibration absorption spring, a vibration absorption mass block arranged at the upper end of the vibration absorption spring, and an additional liquid tank fixed on the vibration absorption mass block. The additional liquid tank is divided into an upper air cavity and a lower liquid cavity by a piston, and the lower liquid cavity, the liquid pump and the liquid storage tank are sequentially connectedby a hose. The vibration absorption device of adjustable natural frequency is arranged on a mounting seat of the engine, and engine vibration is absorbed to the maximum extent by dynamically adjustingthe natural frequency of the vibration absorption device, thus reducing engine vibration.

Description

technical field [0001] The invention belongs to the field of engineering and mechanical structure vibration reduction and vibration elimination technology, and in particular relates to a vibration-absorbing device with adjustable natural frequency and an engine with the vibration-absorbing device. Background technique [0002] The vibration of engineering and mechanical structures is often accompanied by noise, deterioration of working conditions and material fatigue, and may even cause structural damage in severe cases. Therefore, the research on vibration reduction technology has important engineering significance. Dynamic vibration absorption is a commonly used vibration reduction technology. It absorbs the vibration energy of the main vibration structure by adding a dynamic vibration absorption device, so as to achieve the purpose of reducing the vibration level of the main vibration structure. The principle of dynamic vibration absorbing device is as follows: figure 1 ...

AI Technical Summary

Problems solved by technology

However, this vibration absorber only works in a narrow frequency range

When the frequency of the exciting force deviates from the natural frequency of the vibration-absorbing device, the vibration-absorbing effect of the vibration-absorbing device will decrease rapidly, resulting in an increase in the vibration of the main vibration structure

For example, when this kind of vibration absorbing device is used for vibration absorption of automobile engine, the vibration absorption effect is very poor because the engine speed often changes with the road conditions and the driver's will.

Therefore, the practical application of dynamic vibration absorbers is greatly limited, especially in the occasions where the frequency of the exciting force changes frequently

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