Experimental study on dynamic characteristics of a quasi-zero stiffness vibration isolator

In this paper, a kind of quasi-zero stiffness isolator with cam-roller nonlinear spring mechanism as negative stiffness mechanism is studied by sinusoidal sweep frequency experiment, sinusoidal constant frequency experiment and half-sinusoidal impact experiment. The dynamic response characteristics and impact resistance of quasi-zero stiffness isolator are analyzed. The experimental results show that when the excitation is constant, the dynamic response of the quasi-zero stiffness isolation system has a response peak, and the response acceleration and displacement all increase first and then decrease with the increase of frequency. When the excitation amplitude increases, the initial isolation frequency becomes large and the effective isolation bandwidth becomes narrow. For the half-sinusoidal acceleration impact with the pulse width less than 10ms and excitation acceleration less than 13.0g, the quasi-zero stiffness isolation system has excellent isolation and cushioning performance.