Quantitative squeaking evaluation method based on orthogonal-paired comparison test and SVR

A technique for pairwise comparison and quantitative evaluation, which is used in measurement devices, testing of mechanical components, and testing of machine/structural components, etc. It can solve the problems of neglecting and unable to give the contribution percentage of pure tone components to howling.

Active Publication Date: 2019-09-20
XI AN JIAOTONG UNIV +1
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Problems solved by technology

Judging howling by directly analyzing the sound pressure level of the center frequency by 1/3 octave band only considers the energy of the noise signal, ignoring the influence of comprehensive factors such as human psychology, physiology, and environment, and cannot give howling noise based on the subjective feeling of the human ear. Quantitative index called abnormal noise
There are usually multiple pure tone components in...

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  • Quantitative squeaking evaluation method based on orthogonal-paired comparison test and SVR
  • Quantitative squeaking evaluation method based on orthogonal-paired comparison test and SVR
  • Quantitative squeaking evaluation method based on orthogonal-paired comparison test and SVR

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[0098] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0099] Such as figure 1 As shown, a method for quantitative evaluation of howling based on orthogonal-paired comparison test and SVR includes the following steps:

[0100] Step 1: Design an Orthogonal Experiment:

[0101] 1.1) Statistical audio signal characteristics, select 3 factors of amplitude (A), frequency (f), and background noise energy (Eb) in the frequency domain, each factor selects p parameters in turn from low to high, and this embodiment takes 5 Parameters, where the background noise amplitude is the amplitude of the K-point moving average to the audio signal spectrum, get K=1%×N, as follows for the K-point moving average filter:

[0102] yy(1)=y(1)

[0103] yy(2)=(y(1)+y(2)+y(3)) / 3

[0104] yy(3)=(y(1)+y(2)+y(3)+y(4)+y(5)) / M

[0105] yy(4)=(y(2)+y(3)+y(4)+y(5)+y(6)) / M

[0106] ...

[0107] The calculation formula of backg...

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Abstract

Provided in the invention is a quantitative squeaking evaluation method based on an orthogonal-paired comparison test and SVR. A testing sample for a training model is obtained by combining an orthogonal test and a paired comparison test; subjective evaluation of an actually measured audio sample is performed; quantification of the squeaking abnormal sound contribution degrees by different pure tones is performed; and a multi-pure-tone squeaking quantitative evaluation model is constructed by combining an exclusion-contrast thought and a grade scoring method and support vector regression and validity detection is performed. The orthogonal test has characteristics of balancing dispersion, evenness and comparability; and the test number can be reduced substantially. The paired test has characteristics of being easy to operate and being performed simply and fast; the requirement on professional knowledge is low; and the target features can be reflected better. Therefore, the quantitative evaluation of the contribution of the prominent squeaking frequency to the total noise can be realized.

Description

technical field [0001] The invention relates to the technical field of whistling and abnormal sound evaluation of decelerators, in particular to a quantitative evaluation method of whistling based on an orthogonal-pair comparison test and SVR. Background technique [0002] The speed reducer is a mechanism used to change the rotational speed and torque from the engine. It can realize the output of different rotational speeds. It has the advantages of high efficiency, simple structure and convenient use. It is widely used in ships, vehicles and other fields. The gear system of the speed reducer is generally composed of a constant meshing gear pair, a gear meshing gear pair and an idler meshing gear pair. During the production process of the gear, due to the lack of precision of the processing equipment and unreasonable assembly operation, the gear tooth surface appears microscopic. Problems such as uneven appearance and local defects, which in turn lead to harsh whistling an...

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Application Information

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IPC IPC(8): G01M13/021G01M13/028G06F17/50
CPCG01M13/021G01M13/028G06F30/20
Inventor 王琇峰金帅普和丹郭美娜
Owner XI AN JIAOTONG UNIV
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