The Design And Experimental Research Of A Nonlinear Vibration Isolator

In most practical engineering situation, vibration isolation is widespread, it plays a very important role in the national economy and our lives. Set a vibration isolator system in the transmission path, which can reduce vibration from the source to the receiver. This paper summarizes the previous accumulated design for the isolation, designs and analyzes a new type of nonlinear vibration isolator. The isolator has good versatility and good vibration isolation. Specifically, the paper's main findings and conclusions are as follows:1,Analyze the oblique thin-walled beam structure's buckling force characteristics in the vertical direction. By two thin diagonal layout thin-walled beam in parallel with the spring, and nearby the equilibrium position, it has such characteristic that with the capacity change, the displacement has more significant changes but the capacity force has small changes.2,Analyze the device's dynamic characteristics under harmonic excitation, which has a smaller range of dynamic stiffness in the work region. Contrast with the linear system (vertical spring structure), it was found that the device has a low resonance frequency, which can enlarge the zone of vibration isolation. The system also has a smaller displacement transmissibility, and can effectively isolate the vibration from the ground, base and so on, to achieve the purpose of protecting the object.3,Through the dynamics model of the system, combined with static test results, the system's dynamic equation is derived. Since the buckling force properties of thin-walled beam structure, the composite structure's characteristic has changed, the vibration can be described by Duffing equation. By the harmonic balance method, the approximate solution can be obtained. By using Runge-Kutta solution, we can obtain exact solution. Analyze the dynamic system , it may occur such phenomenon that bifurcation ,system stability and the jumps.4,Design a isolator prototype to verify the theory. The model is adjustable. Moving the supportable plate in the chute to adjust the distance between the horizontal direction. Vertical direction of the adjustment knob is to adjust the vertical distance. The model can expand the carrying capacity, and it has versatility.5,The acceleration transmissibility of linear spring and the isolator are tested on vibration table test. Basically, experimental results are consistent with the theoretical analysis. Through experimental results, the isolator can reduce the natural frequency of the system, thereby expanding the range of vibration isolation.