| In order to achieve effective isolation of a given frequency excitation and further broaden the bandwidth of low frequency vibration isolation, a quasi-zero stiffness dynamic vibration absorption system with a sliding block cantilever beam is proposed. Firstly, the principle of adjusting the stiffness and natural frequency of the cantilever beam-sliding block subsystem is analyzed theoretically, and then the influence of structural parameters on the natural frequency is discussed, and the modal analysis is carried out by ABAQUS. Then, the experiment platform for cantilever beam quasi-zero stiffness vibration absorption model is set up, and the experiments of sinusoidal harmonic sweep frequency, sinusoidal fixed frequency and half-sinusoidal impact are carried out, and the inherent characteristics, vibration absorption performance and impact resistance of the system are analyzed. Moreover, the dynamic responses of the cantilever beam quasi-zero stiffness vibration absorption system are compared with that of the quasi-zero stiffness isolation system. The results show that the response peaks of the subsystem are greater than those of the main system, which indicates that the vibration energy of the main system is transferred to the subsystem due to the anti-resonance characteristics, thus reducing the vibration of the main system. Meanwhile, compared with the quasi-zero stiffness isolation system, the initial isolation frequency and response peak value of the system are reduced correspondingly, which is consistent with the theoretical analysis results. When the excitation frequency corresponds to nature frequency of subsystem, the system exhibits obvious vibration absorption performance. In addition, when the pulse width is less than 15ms and the shock excitation is less than 7g half-sinusoidal acceleration shock, the cantilever beam quasi-zero stiffness dynamic vibration absorption system has better cushioning performance. |
