Sliding pair gap value rapid identification method combined with nonlinear detection

Abstract

The invention discloses a sliding pair gap value rapid identification method combined with nonlinear detection. The method comprises the following steps: firstly carrying out the vibration testing ofa nonlinear mechanical structure containing a sliding pair through employing a Gaussian white noise random signal as an excitation source, and measuring a displacement response signal at a gap position; according to the measured displacement response signal, generating a corresponding replacement displacement response signal by using a replacement data technology, and calculating a corresponding EMD energy entropy; performing difference significance test according to the calculated EMD energy entropies of the original displacement response signal and the substitute displacement response signal; and calculating a second derivative of a probability density function by utilizing the original displacement response signal passing the difference significance test, drawing a corresponding curve,and realizing rapid identification of the sliding pair gap value according to the abscissa corresponding to the inflection point of the curve. By adopting the method for identification, the required data information in the process is less, the calculation efficiency is high, and the rapid dynamic monitoring of the sliding pair clearance value can be realized.

Description

technical field [0001] The invention belongs to the technical field of nonlinear system parameter identification, and relates to a method for quickly identifying the gap value of a sliding pair combined with nonlinear detection. Background technique [0002] Considering the need for relative linear motion between parts, there are sliding pair mechanisms in various mechanical equipment. In order to ensure the relative sliding between the sliding pair mechanisms, there is inevitably a gap between the joint surfaces of the sliding pair. The existence of such gaps will change the dynamic characteristics of the structure, and will also have a negative impact on the overall operating stability and performance of mechanical equipment. The gap value refers to the size of the gap between the joint surfaces of the sliding pair components, which is a key parameter characterizing the nonlinearity of the sliding pair gap, and is also the direct object of the adverse effect of subsequent...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fast identification method of sliding pair gap value combined with nonlinear detection, which solves the problems of more required data information and lower calculation efficiency existing in the prior art

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