Roundness error evaluating method based on EMD (empirical mode decomposition)

An empirical mode decomposition and roundness error technology, applied to measuring devices, instruments, etc., can solve problems such as difficult to obtain satisfactory results, different analysis results, difficult to master, etc., to achieve easy programming, fast and convenient analysis process, and easy to master Effect

Active Publication Date: 2014-09-10
浙江知多多网络科技有限公司
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Problems solved by technology

Scholars at home and abroad have done some research on the separation of roundness errors. At first, the digital filter technology was used to directly filter out the interference components of the test signal. The conventional digital filter takes the stationary signal as the analysis object, but the signal in the roundness error test often has non-stationa

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  • Roundness error evaluating method based on EMD (empirical mode decomposition)
  • Roundness error evaluating method based on EMD (empirical mode decomposition)
  • Roundness error evaluating method based on EMD (empirical mode decomposition)

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Embodiment Construction

[0033] The method of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] figure 1 It is a flow chart of the roundness error estimation method based on empirical mode decomposition, and the specific implementation steps are as follows:

[0035] Step 1: Collect equiangular data from 0 to 360° around the rotation center of the workpiece, divide the circumference into N equal parts, and obtain the distance data from the edge to the rotation center, that is, the radius x(θ j ), where j is an integer from 0 to N, θ j =j*360 / N.

[0036] Step 2: EMD decomposition is performed on the measured radius data, and various components in the signal are decomposed into several IMF components and a residual component. The specific decomposition process is as follows:

[0037] (1) Determine the signal x(θ j ) all local extreme points, use cubic splines to connect all local maximum points to form an upper envelope, and then use cubic ...

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Abstract

The invention discloses a roundness error evaluating method based on EMD. The method comprises performing angle sampling on a workpiece within one circle to obtain radius data of the workpiece, performing EMD on the radius data to decompose the radius data into a plurality of intrinsic mode functions (IMF) and a residual component from high frequency to low frequency, removing interference signal components through wave numbers; performing reconstitution through residue IMF to obtain surface shape error signals and further to calculate roundness errors. The roundness error evaluating method based on EMD is high in anti-interference performance, self-adapting, higher in analysis precision compared with traditional methods, rapid and convenient in the entire analysis process and easy to master by users.

Description

technical field [0001] The invention belongs to the technical field of precision instrument manufacturing and measurement, in particular to a roundness error evaluation method based on an empirical mode decomposition method. Background technique [0002] Roundness error is an important form and position accuracy index of rotary parts, and is the basis for evaluating many other form and position errors. The existence of roundness error directly affects the fit and rotation accuracy of parts, which will cause friction, vibration, noise, etc., which will reduce the service life of parts and increase energy consumption. Therefore, accurate evaluation of roundness error not only provides a basis for the acceptance of parts , and provide a reliable guarantee for the improvement of parts processing accuracy and assembly accuracy. [0003] The components of the roundness error detection signal are complex. In addition to the roundness error signal, it also includes measurement nois...

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Application Information

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IPC IPC(8): G01B21/20
Inventor 章国稳吕琦马婧华尚平刘亦安毛晓靖
Owner 浙江知多多网络科技有限公司
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