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Analyzing method for transferring path based on absolute transferring rate function

A technology of transmission path analysis and transmission rate, which is applied in the field of vibration signal analysis, structural dynamic parameter identification, and vibration modal analysis under working conditions. The effect of shortening the test process and avoiding the load identification process

Active Publication Date: 2017-11-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] In order to overcome the problems existing in the prior art, the embodiment of the present invention provides a transfer path analysis method using the absolute transmissibility function, which can simplify the relatively complicated experimental process of the traditional transfer path analysis, shorten the test process; avoid the transmissibility matrix Ill-conditioned problems in computing

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  • Analyzing method for transferring path based on absolute transferring rate function
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  • Analyzing method for transferring path based on absolute transferring rate function

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Embodiment Construction

[0017] The embodiment of the present invention provides a transmission path analysis technology suitable for low frequency and high frequency bands, which can calculate the contribution of each subsystem in the whole frequency band, thereby expanding the applicable scope of transmission path analysis.

[0018] To achieve the above object, the implementation of the present invention adopts the following steps:

[0019] Step 1: Import the transmissibility function of the measurement structure;

[0020] Step 2: Choose an appropriate method to estimate the transfer rate function matrix;

[0021] Step 3: Normalize the transfer rate function to eliminate the ill-conditioned problem of the matrix;

[0022] Step 4: Calculate the estimated transmissibility function matrix to obtain the absolute transmissibility function matrix;

[0023] Step 5: Transform the subsystem response time domain data under real excitation into frequency domain data, and multiply the response of the frequenc...

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Abstract

The embodiment of the invention discloses an analyzing method for a transferring path based on an absolute transferring rate function. By analyzing contribution degree through the absolute transferring rate function, the heavy loading identification work in the traditional transferring path analysis is avoided, and the practical operational process in engineering is simplified, thereby improving the analysis efficiency of the transferring path and shortening project period. The analyzing method is suitable for transferring path analysis condition of low-frequency and high-frequency. According to the method of the invention, the method comprises the following steps: providing an advanced transferring path analysis method based on the absolute transferring rate function, namely, the analysis of calculating the transferring rate function of the system obtained by measurement to obtain the absolute transferring rate function and subsystem contribution degree; processing the transferring rate function by a normalization principle and identifying the obtained contribution degree result by taking a principle component analysis method.

Description

technical field [0001] The invention relates to the field of vibration signal analysis and structural dynamic parameter identification, in particular to the field of vibration mode analysis under working conditions. Background technique [0002] Transfer Path Analysis (TPA) is a research method to solve the problem of noise vibration and harshness (Noise Vibration Harshness, NVH). After more than 20 years of development, this method has been widely used in the location of noise and vibration sources at home and abroad, and has been widely recognized in the NVH field. In practical application, the transfer path analysis method has derived many methods, among which the traditional TPA method is currently the most widely used method, and other transfer path methods are developed on the basis of this method. [0003] As a basic method, the structure information obtained by the traditional TPA method has a high precision. During the gradual development of TPA technology, the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/15G06F17/16
CPCG06F17/15G06F17/16
Inventor 王彤黄英杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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