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Tune energy and human ear frequency selectivity based squeal judgment method for speed reducers/changers

A frequency-selective, decelerating and variable-speed technology, applied in voice analysis, instruments, etc., can solve problems such as ignoring human ear selectivity

Active Publication Date: 2019-06-21
XI AN JIAOTONG UNIV
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Problems solved by technology

Judging the howling by directly analyzing the energy of the center frequency by 1 / 3 octave band only considers the energy of the noise signal, ignoring the frequency selectivity of the human ear, and cannot give the frequency order that causes howling according to the subjective feeling of the human ear. primary and secondary relationship

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  • Tune energy and human ear frequency selectivity based squeal judgment method for speed reducers/changers
  • Tune energy and human ear frequency selectivity based squeal judgment method for speed reducers/changers
  • Tune energy and human ear frequency selectivity based squeal judgment method for speed reducers/changers

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Embodiment Construction

[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0048] Such as figure 1 As shown, a method for judging the howling of a decelerator based on tone energy and frequency selectivity of the human ear, including the following steps:

[0049] Step 1: Sampling the noise signal of the decelerator through the noise sensor at high frequency. The sampling frequency is 40960 Hz. Each gear of the decelerator has a different degree of whistling and abnormal sound during the acceleration process; the structure diagram of the decelerator with gear parameters such as figure 2 as shown, figure 2 The number of teeth of each gear, input shaft, output shaft and intermediate shaft are marked in the middle, and the corresponding gear positions of each gear pair are marked below; select the third gear with serious whistling, the speed n=2337rpm, and each shaft rotates Frequency and gear engagement frequency a...

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Abstract

The invention relates to a tune energy and human ear frequency selectivity based squeal judgment method for speed reducers / changers. The method comprises the steps: firstly, sampling noise signals ofa speed reducer / changer, carrying out A weighting on the noise signals, converting processed signals to log domains, and carrying out Fourier transformation, so as to obtain energy-amplitude frequencycurves; then, calculating feature loudness and critical band rate of the noise signals, calculating frequency band acuity of each feature loudness, and subjecting frequency band acuity to normalizingtreatment; subjecting the energy-amplitude frequency curves to frequency interval Gauss smoothing processing to obtain background noises, and selecting candidate tunes; calculating a frequency band acuity weighting factor according to a corresponding relationship between the critical band rate and frequency, and carrying out weighting, so as to obtain the energy-amplitude frequency curves of thenoise signals; calculating tune energy in bandwidth of the tunes, background noise energy and difference between the tune energy and the background noise energy, and carrying out primary and secondarysequencing on abnormal noise frequencies affecting squeal. According to the method, a low-frequency region becomes a non-sensitive region, and a high-frequency region highlights acuity attribute, andthus, a subjective sensation of human ears to squeal is effectively simulated.

Description

technical field [0001] The invention relates to the technical field of evaluation of abnormal noise of deceleration gears, in particular to a method for judging the whine of deceleration gears based on tone energy and human ear frequency selectivity. 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 lead to ear-piercing abnormal noises...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L25/18G10L25/51
Inventor 王琇峰金帅普郭美娜
Owner XI AN JIAOTONG UNIV
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