Experimental Study On Mechanical Properties Of Spring Metal-net Rubber Compound Damper

The metal-net rubber is formed by a certain processing process of stainless steel wire.The damper made of metal-net rubber has many excellent properties that are difficult to obtain by rubber dampers,such as large damping,strong shock absorbing ability,non-volatile in vacuum,no fear of radiation environment,high and low temperature resistance,resistance of fatigue and aging,long life.However,the internal structure of the metal-net rubber is very complicated,and the contact and action forms between the wires are difficult to distinguish.It is a special material with highly nonlinear characteristics,so its mechanical properties have high research value.It has always been a research hotspot that many scholars pay much attention to.Spring and metal-net rubber compound damper have high stiffness designability and load carrying capacity.In this paper,the metal-net rubber is used as the damping element,and the spring metal-net rubber compound damper is designed and fabricated with the wave spring.The static and dynamic mechanical properties of the damper are tested.The details are as follows:(1)According to the parameter separation idea,the static hysteresis curve of the spring metal-net rubber compound damper is decomposed into the elastic restoring force and the dry friction damping force,and the theoretical derivation of the stiffness model and the damping model is carried out.The static hysteresis test was carried out to control the relative density,preload and load amplitude.The static hysteresis characteristics and vibration damping of spring metal-net rubber compound damper under different relative density,preload and loading amplitude were analyzed.The variation rule of energy consumption evaluation parameters.(2)The elastic regenerative force is represented by a power series polynomial,the dry friction damping force is represented by an elliptic equation,and the dynamic hysteresis expression of the spring metal-net rubber compound damper is derived by combining the power series polynomial with the elliptic equation.The relative density,pre-tightening amount and loading frequency were controlled as variables.The dynamic hysteresis test was carried out on the spring metal-net rubber compound damper and the metal-net rubber damper respectively.The comparative analysis of the two dampers at different relative densitiesDynamic hysteresis characteristics and variation rules of vibration and energy consumption evaluation parameters under preload and loading frequency conditions.(3)According to the viscoelastic damping theory,the expression of the shock-acceleration response of the spring metal-net rubber compound damper is derived.Controlling the relative density,pre-tightening amount,impact amplitude and impact pulse width as variables,the impact test of the spring metal-net rubber compound damper was carried out,and the spring-wire mesh rubber compound damper was analyzed at different relative densities.The variation law of impact acceleration response and impact evaluation parameters under preload,impact amplitude and impact pulse width loading conditions.(4)Combined with the dynamic hysteresis test and impact test data of spring metal-net rubber compound damper,the error analysis of dynamic hysteresis and impact acceleration response theoretical value is calculated according to the proposed dynamic model and impact acceleration response model.The correctness of the dynamic hysteresis mechanical model and the impact acceleration response model is verified,and the variation law of the dynamic response of the damper under different spring stiffness is studied.