Operating condition transmission path analysis method based on blind source separation technology

Abstract

The invention discloses an operating condition transmission path analysis method based on a blind source separation technology. The operating condition transmission path analysis method aims at eliminating the problem of mutual crosstalk among vibration sources in the traditional operating condition transmission path analysis method, and improves the calculation and analysis precision of transmission path contribution. The operating condition transmission path analysis method comprises the steps of: firstly, designing test operating conditions for a mechanical system to be analyzed; measuring test operating condition data, and carrying out blind source separation processing to obtain a separation signal under each test operating condition; establishing and solving an OTPA linear system equation according to the separation signals under the test operating conditions and a response signal of a target point, so as to obtain a transmission rate function matrix; measuring a response signal of a reference point of the mechanical system to be analyzed under the actual operating condition, and carrying out blind source separation processing to obtain a separation signal; multiplying the response signal under the actual operating condition by the recognized transmission rate function matrix to obtain a transmission path contribution result; and ranking different path contribution to obtain a contribution ratio of each transmission path, thereby completing operating condition transmission path analysis.

Description

technical field [0001] The invention relates to the field of vibration reduction and noise reduction of mechanical equipment, in particular to a method for analyzing transmission paths of operating conditions based on blind source separation technology. Background technique [0002] The acoustic stealth performance of underwater vehicles is an important index to measure its safety and combat capability; the vibration and noise of cars and high-speed trains is an important index to evaluate vehicle performance. Therefore, effective monitoring and control of mechanical equipment vibration and noise is of great engineering significance for improving equipment performance. Controlling the transmission path of vibration or noise by applying damping materials or sound-absorbing materials is a very effective method in vibration reduction and noise reduction. The identification of vibration or noise transmission paths is the key to the problem. At present, transfer path analysis (TP...

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Problems solved by technology

Controlling the transmission path of vibration or noise by applying damping materials or sound-absorbing materials is a very effective method in vibration reduction and noise reduction. The identification of vibration or noise transmission paths is the key to the problem. At present, transfer path analysis (TPA) is often used ) or operating condition transfer path analysis (OTPA) method to identify the vibration or noise transfer path, and the traditional transfer path analysis method is difficult to quickly and effectively identify in engineering practice due to its complex frequency response function test and load identification process The transfer path, the transfer path analysis method of operating conditions is a rapid analysis method of the transfer path that has emerged in recent years. This method uses the test condition data to identify the transfer rate function matrix and applies it to the actual condition data to obtain the transfer path Contribution results, this method is simple and fast, and is widely used in engineering practice

[0003] However, in the implementation process of the OTPA method, the mutual crosstalk between the vibration sources makes the measured reference point response signal the result of mixing the signals of each vibration source, which cannot accurately reflect the characteristics of the vibration source, making the path contribution calculated by OTPA There is a large error

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