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Window motor abnormal noise detection method and apparatus based on MFCC and SVM

A technology of abnormal noise and detection method, which is applied to measurement devices, electrical devices, computer parts, etc., can solve problems such as hindering the realization of full automation of window motors, inability to distinguish abnormal noise motors, and inability to accurately estimate the degree of noise contribution.

Active Publication Date: 2016-08-10
CENT SOUTH UNIV
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Problems solved by technology

[0006] In the above method (1), the detection of motor noise by manual auscultation has the disadvantage of strong subjectivity, that is, different people will have different feelings when hearing the same sound. Fatigue is prone to problems such as false detection and missed detection. At the same time, manual detection hinders the realization of full automation of window motor production
[0007] In the method (2) above, the total sound pressure level can identify the window motor that is too loud, but cannot identify the motor with abnormal noise
The analysis method based on the sound spectrum can identify abnormal noise motors to a certain extent, but the frequency spectrum in Hz cannot accurately estimate the contribution of each frequency component to the noise, which makes these methods have limitations in practical applications

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  • Window motor abnormal noise detection method and apparatus based on MFCC and SVM
  • Window motor abnormal noise detection method and apparatus based on MFCC and SVM
  • Window motor abnormal noise detection method and apparatus based on MFCC and SVM

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0066] Such as figure 1 As shown, a method for detecting abnormal noise of a window motor based on MFCC and SVM includes the following steps:

[0067] Step 1: Fix the motor and get the sound signal of the motor.

[0068] The motor is positioned through the positioning bolts on the equipment replacement plate and the positioning holes of the motor, and is clamped and fixed by manual clamps. The microphone (model G.R.A.S 46AE) used for motor sound signal collection is installed at 100-110mm directly above the output shaft of the window motor reducer gear. The data acquisition card model (NI PCI 4462) is connected to the industrial computer through the PCI slot of the industrial computer. The sampling rate of motor sound signal collection is 51200, the sampling time is 4.5s, and the data is saved in WAV. format.

[0069] Step 2: Read the collected WAV ...

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Abstract

The invention discloses a window motor abnormal noise detection method and apparatus based on an MFCC and an SVM. Sound signals during no-load running of a motor are acquired and pre-processed. In the pre-processing stage, a second order Hanning self-convolution window is used as a window function for interception of the sound signals. After pre-processing, data extraction of MFCC parameters is conducted and an SVM is entered for abnormal noise determination. An MFCC feature value and a determination result Label are stored in a historical database. To improve the SVM discriminant accuracy, the invention adopts an artificial bee colony algorithm for SVM parameter automatic adjustment and updating; and the method has the characteristics of high reliability, practicality, and the like, and can be used for effectively distinguishing abnormal motor noises in practical applications.

Description

technical field [0001] The invention relates to an on-line detection technology for motor abnormal noise at a production site of an automobile window motor, in particular to a method and device for detecting abnormal noise of a window motor based on MFCC and SVM. Background technique [0002] As people put forward higher requirements for the comfort of the automotive acoustic environment, NVH (Noise, Vibration, Harshness) has become an important indicator for evaluating the overall performance of automotive motors. The window motor of the car is close to the driver, and the unpleasant sound brought by the window motor will affect the acoustic comfort in the car and bring people an unpleasant acoustic experience, and the motor noise reflects the running state of the motor, and the motor with abnormal noise is often accompanied by Internal structural defects. Before leaving the factory, automotive window motors must undergo strict vibration and noise tests in accordance with ...

Claims

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Application Information

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IPC IPC(8): G01H11/06G06K9/62G10L25/24G10L25/51
CPCG10L25/24G10L25/51G01H11/06G06F18/2411
Inventor 谭建平刘思思李锋黄涛
Owner CENT SOUTH UNIV
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