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A test method for structural road noise transfer function

A transfer function and test method technology, applied in the field of automotive NVH (English abbreviation) experiments, can solve the problems of time-consuming and labor-intensive, transfer function calculation errors, singularity of the input signal self-power spectrum matrix, etc., to achieve high application value and improve reliability. Noise ratio, easy operation

Active Publication Date: 2021-01-05
WUHAN UNIV OF TECH
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Problems solved by technology

However, the traditional TPA needs to disassemble the system, the test preparation is cumbersome, time-consuming and labor-intensive, and the vehicle cannot reflect the dynamic nonlinear transfer characteristics of the suspension in the static state, so the transfer path analysis method (OTPA-Operational Transfer Path Analysis) was proposed. By testing the excitation source response and the target point response under the actual working state of the system, and calculating the transmissibility matrix between the two, the contribution of each transmission path can be obtained without identifying the actual vibration source. Excitation load
Compared with the traditional TPA, OTPA greatly reduces the test workload and improves the efficiency significantly. It can simultaneously identify structure-borne road noise and air-borne road noise. However, due to the strong coherence between the excitations input to the four wheels, the input signal Since the power spectrum matrix is ​​singular, it will cause a large error in the calculation of the transfer function

Method used

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  • A test method for structural road noise transfer function
  • A test method for structural road noise transfer function
  • A test method for structural road noise transfer function

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Embodiment Construction

[0028] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] In this preferred embodiment, the structure road noise transfer function testing method of the present invention comprises the following steps:

[0030] (1) if figure 1 As shown, a pulse excitation device is arranged on the drum of the two-axis chassis dynamometer, an acceleration sensor 1 (preferably a three-way acceleration sensor) is arranged at the center of the four wheels, and an acceleration sensor 1 is arranged at the ear of the seat in the car. The sound pressure sensor 3 is connected to the data acquisition system 2 through a connection line. The data acquisition system 2 can be placed inside or outside the vehicle, subject to the convenience of the experiment.

[0031] In this embodiment, the pulse excitation generating device is realized by means of a general-purpose biaxial chassis dynamometer or...

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Abstract

The invention discloses a structure road noise transfer function test method. The signal-to-noise ratio of a signal can be remarkably improved by sequentially applying periodic pulse excitation onto each wheel, and the strong coherent excitation input and influence of background noise on structure noise transfer function estimation are reduced by a windowing the measured signal. Compared with the prior art, the structure road noise transfer function test method proposed by the invention has the advantage of higher accuracy, is simple and convenient to operate and has relatively high application value in aspects of automobile road noise transfer function test and transfer path analysis.

Description

technical field [0001] The invention belongs to the technical field of automobile NVH (English abbreviation of Noise, Vibration, Harshness) experiment, and in particular relates to a test method of structural road noise transfer function. Background technique [0002] The noise in the car has a direct and important impact on ride comfort, which reflects the core competitiveness of automotive products, and is highly valued by both the automotive industry and academia. The main components of interior noise are tire / road noise, power / drive train noise, wind noise, etc. According to different sources and transmission media, tire / road noise can be divided into air noise and structure noise. Air noise is caused by the mutual circulation and disturbance of the air around the tire when it rotates. Structural noise in tire / road noise (referred to as structural road noise) is generated by the vibration of the vehicle body caused by the excitation of the road surface through the tire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/007G01M17/013G01H1/12
CPCG01H1/12G01M17/007G01M17/013
Inventor 卢炽华朱亚伟刘志恩彭辅明申存锐陈浩谢丽萍
Owner WUHAN UNIV OF TECH
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