Intelligent online quality detection method for automobile transmission

A quality inspection method, the technology of automobile transmission, applied in the direction of machine gear/transmission mechanism testing, etc., can solve the problems of high system price and high environmental requirements, and achieve the effect of comprehensive defect types

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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Problems solved by technology

Similar systems have been successfully applied to industrial occasions in foreign countries, but these systems have high environmental r

Method used

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  • Intelligent online quality detection method for automobile transmission
  • Intelligent online quality detection method for automobile transmission
  • Intelligent online quality detection method for automobile transmission

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0027] The hardware structure of the system is as figure 1 As shown, it is mainly composed of three parts: test bench, signal acquisition system, and industrial control system. The system synchronously collects vibration signals and speed pulse signals. According to the actual speed of the transmission, the maximum speed of the test bench is determined to be 3600r / min, and the encoder is a 360-line incremental photoelectric encoder for collecting speed signals; the vibration sensor is a piezoelectric acceleration sensor, and the frequency range is 0~ 16.5kHz, the sensitivity is 3.1pc / g, used to collect the vibration signal of the transmission box; the internal clock of the acquisition card is 10MHz, with a 32-bit counter, and the analog input can reach 1.25MHz.

[0028] In the example, the input shaft of the transmission is taken as the test object, the encoder sends out 360 pulses per revolution, the number of analysis points is 2048 points, the average is 3 times in the tim...

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Abstract

The invention discloses an intelligent online quality detection method for an automobile transmission, belonging to the field of automobile noise and vibration control. Specific to the important and complexity of online delivery testing, synchronous acquisition of vibrating voltage signals and rotating speed pulse signals is realized on the aspect of signal acquisition. The vibrating voltage signals acquired in the delivery testing process of the automobile transmission are unstable signals, so that the phenomenon of 'frequency alias' occurs when the conventional signal processing method is adopted. Processing of unstable signals of the transmission is performed by combining an order method with a cepstrum method for extracting characteristic signals, so that the problem of 'frequency alias' is solved, sidebands of power spectra are eliminated, and characteristic signals are convenient to observe and extract. A support vector method is used on the aspect of quality detection, and a support vector model is continuously enriched and updated by using a standard extremal curve method, so that the model comprises more information, and the aim of realizing high detection speed and high accuracy is fulfilled.

Description

technical field [0001] The invention relates to an intelligent on-line quality detection method of an automobile transmission, which detects on-line whether there is a defect in the automobile transmission and the cause and location of the defect during the traffic inspection test, especially for the on-line detection of a new transmission produced by a domestic transmission manufacturer , belonging to the field of automotive noise and vibration control. Background technique [0002] As an important part of the car transmission system, the performance and quality of the transmission have a great influence on the overall performance of the car. The internal structure of the transmission is complex and prone to failure. Once a failure occurs, a major accident will occur. Therefore, before the transmission leaves the factory, a traffic inspection test must be carried out. [0003] Since the types of transmission defects are very complex, to accurately diagnose the type and lo...

Claims

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Application Information

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IPC IPC(8): G01M13/02
Inventor 付胜蔡莎莎
Owner BEIJING UNIV OF TECH
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