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A Split-free Substructure Frequency Response Function Identification Method

A frequency response function and mechanical system technology, which is applied in the field of mechanical vibration analysis and detection, can solve problems such as the frequency response function between degrees of freedom that cannot be calculated, and achieve improved operability and analysis efficiency, strong engineering applicability, and improved analysis efficiency Effect

Inactive Publication Date: 2021-02-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a substructure frequency response function identification method based on in-situ measurement frequency response without splitting, based on the "source-path-acceptor" model, and adopts coupling mechanical frequency response function prediction Decouple the mechanical frequency response function, overcome the problem that the existing technology cannot calculate the frequency response function between any degrees of freedom of the mechanical substructure, improve the calculation accuracy of the frequency response function, and lay the foundation for the analysis of the vibration transmission path of the mechanical system

Method used

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  • A Split-free Substructure Frequency Response Function Identification Method
  • A Split-free Substructure Frequency Response Function Identification Method
  • A Split-free Substructure Frequency Response Function Identification Method

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Embodiment 1

[0026] Such as figure 1 As shown, this embodiment includes the following steps:

[0027] Step one, to figure 2 The discrete mechanical system shown includes active parts and passive parts, and the active part consists of four mass blocks M 5 , M 6 , M 8 , M 9 Composition, the passive part consists of 5 mass blocks M 1 ~ M 4 , M 7 Composition, there are 3 transmission paths K between the active part and the passive part 35 、K 46 、K 78 , the mass M 3 , M 4 and M 7 is the coupling point on the passive side, and the mass M 5 , M 6 , M 8 is the coupling point on the side of the active part, and the mass M 1 The displacement is the target response, there are 7 measurement points in total, and the analysis frequency range is 1-250Hz.

[0028] Step 2. Measure the frequency response function of the coupling mechanical system: measure the frequency response function matrix H of the active part of the coupling point c，aa , The frequency response function matrix H of th...

Embodiment 2

[0033] Such as Figure 4 As shown, the present embodiment has shown the simple physical model of vehicle body, and this model comprises vehicle body (passive parts, such as Figure 4 (a) shown) and "engine" bracket (active parts, such as Figure 4 As shown in (c), the bracket is connected to the vehicle body through three rubber suspensions. The experimental device is as follows Figure 4 (b) shown.

[0034] This embodiment includes the following steps:

[0035] Step 1. Determine the measurement point and analyze the frequency range: record the suspension points on the side of the active part as a1, a2 and a3, and the suspension points on the side of the passive part as p1, p2 and p3. The schematic diagram of the suspension and the global coordinate system are as follows: Figure 5 shown. The target point is a point (one-way) vibration response on the right side of the vehicle body, denoted as t. Only the translational degrees of freedom of the suspension points are consi...

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Abstract

A substructure frequency response function identification method based on in-situ measurement of frequency response function without splitting. Firstly, the components in the mechanical system are classified into active parts, passive parts and elastic The frequency response function of the decoupled mechanical system is obtained by using the component frequency response function prediction formula. Based on the "source-path-acceptor" model, the present invention uses the coupled mechanical frequency response function to predict the decoupled mechanical frequency response function, overcomes the problem in the prior art that the frequency response function between any degrees of freedom of the mechanical substructure cannot be calculated, and improves the frequency response The calculation accuracy of the function is improved, and it lays the foundation for the analysis of the vibration transmission path of the mechanical system.

Description

technical field [0001] The invention relates to a technology in the field of mechanical vibration analysis and detection, in particular to a substructure frequency response function identification method based on in-situ measurement of the frequency response function and without splitting. Background technique [0002] Transfer Path Analysis (TPA) is widely used to analyze and deal with vibration and noise problems of complex mechanical systems. Through TPA, the excitation source can be identified and quantified, the path of energy transfer from the excitation source to the target point can be analyzed, and different transfer paths can be accurately evaluated and sorted. Contributions to target points, noise and vibration can be controlled within predetermined target values ​​by controlling and improving these paths. The classic TPA has become the standard TPA in the field of automotive NVH due to its comprehensive information and high analysis accuracy. Classical TPA mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/16G06F17/17
CPCG06F17/16G06F17/17
Inventor 朱平王增伟刘钊覃智威张海潮
Owner SHANGHAI JIAO TONG UNIV
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