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

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...

AI Technical Summary

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 the noise signal of the gear reducer. The TNR index in the ECMA standard calculates the signal-to-noise ratio in the critical frequency band, which can indicate the contribution of the pure tone to the howling to a certain extent, but ignores the psychological and physiological factors. , environment and other factors, it is impossible to give the contribution percentage of each pure tone component to the abnormal howling sound

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