Method for determining equivalent damping of dry friction damping isolators

Abstract

The invention relates to a method for confirming an equivalent damp of a dry-friction damping vibration isolator. The method comprises the following steps: (1) establishing a theoretical model of the dry-friction damping vibration isolator; (2) performing a sweep frequency test on a vibration isolator loaded with a load; (3) performing finite element simulation; (4) performing finite element calculation; (5) optimizing a damp; and (6) confirming a practical equivalent damp C of the dry-friction damping vibration isolator. A test and theoretical simulation combined method is applied to the method for confirming the equivalent damp of the dry-friction damping vibration isolator provided by the invention, a vibration isolation curve of the vibration isolator is acquired through the sweep frequency test, the vibration isolation curve is taken as an optimization target, the damp in each frequency band is taken as a variable, the equivalent damp of the dry-friction damping vibration isolator is confirmed according to a finite element simulation method, and thus a new effective method for confirming and finding the equivalent damp of the dry-friction damping vibration isolator is supplied.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a method for determining equivalent damping. Background technique [0002] In the field of nonlinear vibration research, vibration isolation systems with dry friction damping have received extensive attention. In mechanical structures, dry friction can quickly and effectively suppress the dynamic response of external disturbance excitation to the system, so it is widely used in the vibration isolation of aeroengine blades, crystal oscillators and other structures. [0003] In recent years, scholars at home and abroad have done a lot of research on the vibration system composed of nonlinear vibration isolators with dry friction. For example, Bai Hongbai et al. studied the equivalent linearization calculation method of the viscous damping hysteresis oscillator's harmonic excitation response; the literature researched the periodic motion behavior of the friction oscillator unde...

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Problems solved by technology

However, the above existing literature does not give a clear equivalent method for the corresponding relationship between friction, damping and frequency.

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