A Novel Design Of Quasi-zero-stiffness Isolator Based On Pseudoelasticitv Effect And Its Experiment Study

Vibration is a common phenomenon in nature,and it is an inevitable phenomenon when it is stimulated by external stimuli.Vibration is very crucial for some equipment,especially for some important equipment and precision instruments.The suppression of vibration has been a hot topic,and many researchers have put forward a lot of solutions to the common vibration isolation.However,the problem of low frequency vibration isolation is especially difficult because of its own theoretical difficulty,and low frequency vibration is an urgent problem to be solved for some military equipment,such as engine.In this paper,a lot of reading and summarizing the methods of suppressing low frequency vibration at home and abroad,a new method based on the quasi zero stiffness principle and the combination of hydraulic pressure vessels is proposed to solve the problem of low frequency vibration isolation.The quasi zero stiffness principle has been applied to the hydraulic accumulator and the new type of intelligent material shape memory alloy spring.The experimental bench is designed,and the principle is demonstrated,and the feasibility of the whole system to solve the problem of low frequency vibration isolation is verified.This paper is divided into six chapters,the main contents are as follows:The first chapter introduces the research background and significance,research status of low frequency vibration isolation at home and abroad were reviewed,analyzed the principle of vibration isolation and cannot be used in the traditional low frequency vibration field,and finally leads to the subject.In the second chapter,Shape memory alloys and their shape memory effect and superelastic effect are briefly introduced.Some common constitutive models for shape memory alloy engineering are summarized.Finally,the application of shape memory alloy in the field of vibration is briefly introduced.The third chapter:the quasi zero stiffness principle based on the pseudo elastic effect of shape memory alloy is introduced in detail,and the concept of the inertial container is described,which leads to the vibration isolation system for the low frequency vibration design.The working principle of the system is analyzed,and the vibration isolation capability is verified,which provides a theoretical basis for the following experiment.In the fourth chapter,the theoretical model of Ginzburg-Landau based on improved,leads to a differential equation model of shape memory alloy spring,combined with the mechanism of the Preisach model,a new multi crystal dynamic model,realize the accurate description of the shape memory alloy spring variety of hysteretic nonlinear mechanical behavior.Finally,the parameter identification method of single crystal model and multi crystal model is presented in this chapter,which is the nonlinear optimization algorithm based on the minimum error.The fifth chapter:the experimental study of low frequency vibration isolation system is presented in this paper,introduces the experimental principle and experimental device,according to the experiment scheme,the corresponding experimental data collected through the Labview program to analyze the data,verify the validity of the experimental system for low frequency vibration.In the sixth chapter,the work of this paper is summarized,the deficiencies of this project are described,and the prospects for the development of the low frequency vibration isolation device are presented.