A nonlinear torsional damper used at the end of an elastic structure

Abstract

The invention relates to a nonlinear torsional damper used at the end of an elastic structure. The nonlinear torsional damper comprises a rocker arm, a spring, a motion amplification mechanism, an annular vibrator and an eddy current retarder; one end of the rocker arm is vertically fixed with the end of the elastic structure and the other end of the rocker arm is connected with the spring; the rocker arm is arranged in a circumference; the other end of the spring is connected with a driving part of the motion amplification mechanism; a driven part of the motion amplification mechanism is connected with the annular vibrator; a rotor of the eddy current retarder is connected with the annular vibrator; and a stator of the eddy current retarder is connected with the motion amplification mechanism. Through the motion amplification mechanism, equivalent rotation inertia amplification is realized, so that transverse vibration of the elastic structure and energy transfer of torsional vibration of the annular vibrator are realized. According to the nonlinear torsional damper, transversal bending vibration energy of protected bodies is absorbed and dissipated through torsional vibration, the rotation is free of stroke limit, the motion space is determined, and the possibility of colliding and interfering with other mechanisms is avoided.

Description

technical field [0001] The invention relates to the field of mechanical vibration damping, in particular to a nonlinear torsional vibration damper used at the end of an elastic structure. Background technique [0002] Vibration control is of great significance in engineering fields such as military, infrastructure, aerospace, precision measurement and control. The linear vibration absorber is the earliest and most common vibration suppression device in the field of passive control. However, it is very sensitive to the operating frequency, and the efficiency will drop rapidly outside the operating frequency domain; it is particularly important that it will affect the free vibration characteristics of the original system. Change the original design performance. As an improvement, nonlinearity is applied to the damper. Since there is no linear resonance frequency, the nonlinear damper can realize broadband vibration control without affecting the free vibration characteristics...

AI Technical Summary

Problems solved by technology

However, the nonlinear dampers currently used in the lateral vibration control of elastic continuum mostly use linear motion oscillators, which have the disadvantages of large range of motion and inconvenient installation and maintenance; and the control efficiency in micro-vibration environments still needs to be improved

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