Study On Mechanical Characteristics And Hysteresis Model Of Wire Rope Vibration Isolator

When warships are fighting at sea,they will inevitably face various shock damage problems caused by non-contact explosion.This kind of high-strength shock will cause great damage to the warship and ship-based equipment.In order to guarantee the safety of the ship and improve the combat capability of the ship,it is necessary to isolate the vibration and shock of the warship equipment effectively.Therefore,as the most widely application of wire rope vibration isolator on ships,it is very important to study the mechanical properties under vibration and shock.Taking the wire rope vibration isolator as the research object,the mechanical characteristics and hysteresis model of the wire rope vibration isolator are studied.The dynamics of the single-degree-of-freedom vibration isolation system is solved,and the coulomb damping and structural damping are linearized and equivalent based on the principle that the energy consumed by the vibration isolator in a vibration period is equal,so as to compared and analyzed the response of the vibration isolator under different damping,focus on the analysis of the similarities and differences between linear damping and structural damping in the amplitude-frequency and phase-frequency characteristics.Because the complicated internal structure can not be simulated by theoretical calculation and finite element software,the quasi-static,dynamic and impact experiments of D-type and Q-type wire rope vibration isolators were designed and carried out,and the performance changes of wire rope vibration isolators under different loading displacement,structural parameters of wire rope vibration isolators,impact pulse and pulse width were explored.Because of the hysteresis damping inside the wire rope vibration isolator,it had strong nonlinear characteristics,so its constitutive relationship was much more complex than other systems.Based on the static experiment of the wire rope vibration isolator,the constitutive relationship and parameter identification of the wire rope vibration isolator were studied.Due to the problem that the identification parameters of the newton iterative method of the hysteresis model did not converge,the genetic algorithm is proposed.The results show that this method can accurately identify the parameters of the hysteretic model of the vibration isolator,and then determine the constitutive relationship of the hysteretic model of the wire rope isolator.By comparing the theoretical hysteresis model curve with the experimental hysteresis loop,it is found that the error between them is small,and the influence of different hysteresis model parameters on the performance of the isolator is explored.Aiming at the disadvantages of traditional hysteretic model,such as complex modeling and difficult parameter identification,an elliptical energy model was proposed and established based on the dynamic and impact experiments of wire rope isolators.It was verified that the model can characterize the energy consumption and hysteretic characteristics of D-type,Q-type and T-type wire rope isolators in vibration and impact environment under tension and compression direction,and has strong universality and wide application range.The hysteresis model of the wire rope isolator is simplified,the number of parameters to be identified is reduced,and the error between the theoretical model curve and the experimental hysteresis loop area is small,which lays a foundation for the subsequent study of the constitutive relationship model and mechanical properties of the wire rope vibration isolator,and provides a theoretical basis for the design and selection of the wire rope vibration isolator.