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A Transfer Path Analysis Method Based on Absolute Transfer 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: 2021-03-09
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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  • A Transfer Path Analysis Method Based on Absolute Transfer Rate Function
  • A Transfer Path Analysis Method Based on Absolute Transfer Rate Function
  • A Transfer Path Analysis Method Based on Absolute Transfer 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 present invention discloses a transmission path analysis method based on the absolute transmissibility function, which uses the absolute transmissibility function to analyze the contribution, which can avoid the heavy load identification work in the traditional transmission path analysis, and simplify the operation process in engineering practice. Thereby improving the efficiency of delivery path analysis and shortening the project cycle. And it is commonly used in high-frequency and low-frequency transfer path analysis situations. The method of the present invention includes: proposing an advanced transfer path analysis method based on the absolute transmissibility function, that is, calculating the absolute transmissibility function through the measured transmissibility function of the system to obtain the analysis of the contribution of the subsystem; using the normalization principle to analyze the transfer path The rate function is used for processing; the obtained contribution results are identified by principal component analysis.

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...

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Application Information

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Patent Type & Authority Patents(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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