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Identification method for contact collision parameter between complex surfaces

A technology for complex surfaces and collision parameters, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of contact collision stiffness coefficient and damping coefficient that cannot be obtained by existing methods, and achieve high precision and ensure accurate Effects of Sex and Stability

Inactive Publication Date: 2018-05-08
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for identifying contact collision parameters between complex surfaces to solve the problem that the corresponding contact collision stiffness coefficient and damping coefficient cannot be obtained by existing methods for contact collision surfaces with complex geometric shapes

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  • Identification method for contact collision parameter between complex surfaces
  • Identification method for contact collision parameter between complex surfaces
  • Identification method for contact collision parameter between complex surfaces

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Embodiment Construction

[0018] In order to illustrate the technical scheme and technical purpose of the present invention, the present invention will be further introduced below in conjunction with the accompanying drawings.

[0019] combine figure 1 , a method for identifying contact collision parameters between complex surfaces of the present invention, comprising the following steps:

[0020] The symbols used in the present invention follow the following rules: the symbols representing vectors and matrices are expressed in bold and bold; the symbols representing variables are expressed in italics.

[0021] Step 1. Obtain input parameters: contact collision force F, contact collision displacement δ, and contact collision velocity

[0022] Obtain the contact collision force F, contact collision displacement δ and contact collision velocity within the time of a contact collision between two complex surfaces by experiment or finite element simulation method These three parameters are also the inp...

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Abstract

The invention discloses an identification method for a contact collision parameter between complex surfaces. The method comprises: firstly, through experiments or a finite element simulation method, obtaining contact collision force, contact collision displacement, and contact collision speed during one time contact collision of two complex surfaces; then performing dimensionless processing on input parameters; defining nondimensionalized parameters, using a standardized parameter to perform dimensionless processing on the input parameters; finally, estimating related contact collision kineticparameters; using an unscented Kalman method to perform kinetic parameter estimation, including establishing a parameter estimation model corresponding to a contact collision problem based on an universal model of the unscented Kalman method, then using an unscented Kalman algorithm to estimate the contact collision kinetic parameters. The method reduces difference of a left side quantity value and a right side quantity value of an estimation equation, ensures accuracy and stability of a parameter estimation result, and the parameter estimation result reaches second order and even higher precision.

Description

technical field [0001] The invention belongs to the field of mechanical dynamics, in particular to a method for identifying contact collision parameters between complex surfaces. Background technique [0002] Due to factors such as manufacturing precision, assembly error, wear and material deformation in the actual mechanical structure, the existence of gaps is inevitable. The existence of gaps in the mechanism will lead to the occurrence of contact collisions, which will affect the dynamic response of the system, aggravate the wear and damage of the mechanism, generate serious noise and vibration, and lead to the reduction of the overall precision of the mechanical system, performance degradation and hidden dangers. For high-speed system, this effect is particularly large. At present, there are two main methods to solve this problem: one is to improve the processing and manufacturing precision, eliminate the gap, so as to avoid the occurrence of contact collision, but cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2119/06
Inventor 钱林方陈光宋马佳付佳维陈红彬陈龙淼徐亚栋
Owner NANJING UNIV OF SCI & TECH
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