Operation-condition transfer path analysis method based on Landweber iteration method

Abstract

The invention discloses an operation-condition transfer path analysis method based on a Landweber iteration method. Based on test operation condition designing and test operation condition data measurement, a transmissibility functional matrix is reversely solved through observed reference-point response signals and target-point response signals. The operation-condition transfer path analysis method includes the following steps that 1, reference-point and target-point response signals under a test condition are collected by arranging sensors, and observed signals are subjected to fast fouriertransform; 2, an iteration scheme suitable for the ill-posed Landseber iteration method is selected and used for estimating the transmissibility functional matrix; 3, the obtained transmissibility functional matrix is reciprocally multiplied by reference point responses measured in actual conditions, and the contribution quantity and the total contribution quantity of all transfer paths are calculated. According to the operation-condition transfer path analysis method, in the process that the transmissibility functional matrix is solved, and due to small disturbance of original data, large disturbance of obtained solutions can be avoided; the good noise-resistant capacity is achieved, the fitting degree of the obtained solutions is high, and the excellent actual situation reflecting capacity is achieved.

Description

technical field [0001] The invention relates to the fields of mechanical vibration signal processing and vibration reduction and noise reduction, in particular to a method for analyzing transmission paths of operating conditions based on the Landweber iterative method. Background technique [0002] Acoustic stealth performance of underwater weapons Acoustic stealth performance is an important index to measure its safety and combat capability. Therefore, effective monitoring and control of vibration and noise of shell structure equipment has important engineering significance for improving equipment performance. The identification of the vibration or noise transfer path is the key to the problem. At present, the method of transfer path analysis (TPA) or operating condition transfer path analysis (OTPA) is often used to identify the vibration or noise transfer path. The traditional transfer path analysis method is due to its The complex frequency response function test and loa...

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Problems solved by technology

The identification of the vibration or noise transfer path is the key to the problem. At present, the method of transfer path analysis (TPA) or operating condition transfer path analysis (OTPA) is often used to identify the vibration or noise transfer path. The traditional transfer path analysis method is due to its The complex frequency response function test and load identification process make it difficult to quickly and effectively identify the transfer path in engineering practice. The transfer path analysis method of operating conditions is a rapid analysis method of transfer path that has emerged in recent years. This method uses test condition data Identify the transfer rate function matrix and apply it to the actual working condition data to obtain the result of the contribution of the transfer path. This method is simple and fast, and is widely used in engineering practice

[0003] Existing OTPA methods all have defects such as low fitting degree of transfer rate function matrix and insufficient stability, that is, the ability of the solution to reflect the actual situation and the ability to resist noise cannot meet the actual engineering needs

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