A method for detecting abnormal knocking noise of gear box off-line

A detection method and gearbox technology, which is applied in the field of vibration and acoustic roughness (English abbreviation) detection, gearbox NVH, can solve the problems of low efficiency, large instantaneous energy, high cost, etc., achieve unified evaluation standards and avoid misjudgment , low cost effect

A detection method and gearbox technology, which is applied in the field of vibration and acoustic roughness (English abbreviation) detection, gearbox NVH, can solve the problems of low efficiency, large instantaneous energy, high cost, etc., achieve unified evaluation standards and avoid misjudgment , low cost effect

CN109813546BActive Publication Date: 2020-09-15苏州微著设备诊断技术有限公司
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  • A method for detecting abnormal knocking noise of gear box off-line
  • A method for detecting abnormal knocking noise of gear box off-line
  • A method for detecting abnormal knocking noise of gear box off-line

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, a method for offline detection of abnormal knocking noise of a gear box includes the following steps:

[0031] Step 1: Use the vibration acceleration sensor to collect the vibration signal of the gearbox respectively, and the photoelectric sensor to sample the speed signal of the input shaft of the gearbox, and the sampling frequency is 20KHz; Simplified picture such as figure 2 As shown, gear structure parameters: input bevel gear teeth number: z 1 =21, output bevel gear teeth number: z 2 =28, the average speed of the gearbox input shaft: f n =158.3rpm, the original vibration signal waveform of the gearbox is as follows image 3 shown;

[0032] Step 2: According to the number of teeth and the transmission relationship of each gear of the gearbox, and taking the order of the input shaft of the gearbox a...

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Abstract

The invention discloses an off-line detection method for a knock abnormal sound of a gearbox. Firstly, based on a statistics method, a random impact interference component in a vibration signal is removed; then, based on a TSA method, a periodic impact component representing the knock abnormal sound of the gearbox is extracted; finally, a kurtosis index of the signal is calculated and extracted tobe compared with a set abnormal sound threshold value, in this way, whether or not the knock abnormal sound of the gearbox exists is judged, and an abnormal sound source is locked on a rotary shaft.The off-line detection method can be applied to the off-line detection stage of the gearbox, in a random impact interference environment, the knock abnormal sound of the gearbox is automatically detected, wrong judgment and judgment missing in human ear detection are avoided, the knock abnormal sound of the gearbox is automatically detected, and the off-line detection method has the advantages ofrealizing uniform evaluation standards, being high in efficiency and low in cost, and easily tracing to the source of the problem.

Description

technical field [0001] The present invention relates to a gearbox NVH (English abbreviation for Noise, Vibration and Harshness) detection method, in particular to a gearbox knocking abnormal sound off-line detection method. Background technique [0002] In modern industry, as an important general-purpose component for connecting and transmitting power in mechanical equipment, gearboxes are widely used because of their advantages such as fixed transmission ratio, large transmission torque, compact and reliable structure, etc. With the development of society, NVH issues are getting more and more attention from various industries. As one of the difficult problems in NVH control, the off-line detection of abnormal noise of gearboxes has increasingly become the focus of attention of the manufacturing industry. [0003] During the production, handling, and installation of axle gear parts, due to improper operation by production personnel, the gears collide with other equipment, w...

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Application Information

Patent Timeline
15 Sep 2020
Publication
CN109813546B
IPC
G01M13/021; G01M13/028
Inventors
王琇峰; 王国振