| In the application of vibration isolation,passive vibration isolation is often one of the most commonly used and effective means,but due to the randomness of external excitation,especially in harsh environments such as far sea,deep space and deep wells,passive vibration isolation can not meet the requirements in low frequency band and resonance area.Active vibration isolation can make up for the deficiency of passive vibration isolation and become an important means to solve the problems of resonance and low frequency vibration.However,the active vibration isolation is unstable in the high frequency band,and the active control module needs a stable power supply,which limits the active vibration isolation under remote harsh conditions.In view of the limitations of passive and active vibration isolation,the combination of active and passive vibration isolation and piezoelectric capture of electric energy is the key means to solve the complex vibration problem under remote harsh conditions.Therefore,the original intention of this paper is to carry out the research on the vibration isolation method which has the ability of vibration energy capture and meets the needs of active and passive vibration isolation.By means of energy capture,the vibration energy is captured and converted to provide electric energy for the active control system,which makes the active vibration isolation more convenient under harsh conditions.At the same time,through the capture,conversion and reuse of vibration energy,active and passive vibration isolation can be developed in the direction of energy saving and low carbonization.Therefore,based on the piezoelectric energy capture theory,this paper carries out the research on the piezoelectric oscillator and the energy capture efficiency.Through the theoretical analysis and simulation of the cantilever piezoelectric vibrator,the key factors affecting the energy capture of the piezoelectric vibrator are obtained.For the purpose of active vibration isolation power supply,a secondary energy capture device is designed to realize high efficient energy capture in low frequency band through the principle of collision frequency conversion.Using metal rubber with excellent vibration isolation performance as vibration isolation material,a metal rubber double-layer vibration isolator is designed.Combined with the dynamic model of double-layer vibration isolation,the transmission characteristics of the system are analyzed,and the parameters of the vibration isolation system are determined.According to the influence of the active control force on the vibration isolation system,the active-passive combined vibration isolation method is optimized.secondly,the active vibration isolation scheme of adaptive control is determined by designing and analyzing the control system.Through the simulation analysis,the force transfer characteristics of the vibration isolation system under different working conditions are obtained.On this basis,the experimental platform of the energy capture and vibration isolation system is built to verify the feasibility of the secondary energy capture device and the superiority of the vibration isolation system in a wide frequency band.In this paper,an active-passive combined vibration isolation method of metal rubber based on piezoelectric energy capture is proposed,which uses the way of energy capture to realize the conversion and utilization of energy,and through the combination of active and passive to achieve efficient vibration isolation in a wide frequency band.The metal rubber active-passive vibration isolation with piezoelectric energy capture can not only reduce the overall energy consumption of the vibration isolation system,but also improve the environmental adaptability of the active-passive vibration isolation under harsh conditions,which is of great significance for enriching the wide-band vibration control theory and developing green low-carbon vibration isolation technology. |
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