Method for simulating noise radiation and decomposing noise sources when automobile speeds up

A technology of accelerating driving and noise radiation, applied in the fields of automotive product development, noise control, and acoustic signal processing, which can solve the problems of increasing product development cycle and cost, etc.

Inactive Publication Date: 2010-08-18
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the development of automobile products, it is often through the noise test of the prototype car to determine whether the noise meets the standard. When the noise exceeds the standard, the product will be noise-reduced and design improved, thereby increasing the product development cycle and cost.

Method used

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  • Method for simulating noise radiation and decomposing noise sources when automobile speeds up
  • Method for simulating noise radiation and decomposing noise sources when automobile speeds up
  • Method for simulating noise radiation and decomposing noise sources when automobile speeds up

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 , 2 Shown is a principle schematic diagram and a dynamic schematic diagram thereof of the present invention;

[0031] 1.1 figure 1 It is a schematic diagram of the device, describing the general idea of ​​the present invention, wherein the source refers to each noise source P j , figure 1 The noise source shown in is the engine and the exhaust port; the path is the transfer function in which the noise is emitted by the components and received by the receiver; the contribution is the total sound pressure level P received by the receiver m is the total contribution of each assembly component at this receiver.

[0032] 1.2 Dynamic description of the exterior noise test of accelerating vehicles

[0033] Information at time t:

[0034] X(t) The spatial position of the vehicle at time t

[0035] v(t) The speed of the vehicle at time t

[0036] rpm(t) The speed of the vehicle at time t

[0037] load(t) The load of the vehicle at time t

[0038] x i ...

Embodiment 2

[0055] Such as image 3 Shown is a schematic diagram of the prediction algorithm of the present invention;

[0056] 2.1 Load data

[0057] 2.1.1 Load the vehicle structure data, including the length of the vehicle body and the spatial position of the geometric center of each assembly component relative to the front of the vehicle (see Table 2);

[0058] 2.1.2 Load the component bench test data, that is, the sound pressure level of each assembly component at different speeds (see Table 3-Table 10), the data of each component in Table 3-Table 10 indicates that the engine speed interval is: 1000 , 1500, 2000, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400r. / min, the sound pressure level of each component measured by the microphone on the bench test.

[0059] 2.1.3 Load the lane data, load the data according to the test conditions described in ISO362- "Measurement Method for Exterior Noise of Accelerated Vehicles", including the incoming speed, outgoing speed, ...

Embodiment 3

[0082] Such as Figure 4 , 5 Shown is the operation result figure of the present invention;

[0083] in Figure 4 It represents the schematic diagram of the external noise of the simulated accelerating vehicle, Figure 5 Indicates the equivalent sound pressure level of each noise source and its contribution. List the final calculation results in Table 11;

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PUM

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Abstract

The invention relates to a method for simulating noise radiation and decomposing noise sources when an automobile speeds up, which is characterized in that: individual noise characteristics are measured by performing a bench test on a structure and an engine, the engine and a gearbox, a cooling fan, a muffler, an exhaust port, an inlet port, tires and a rear axle of a vehicle. The method comprises the following specific steps: (1) establishing an acoustical model of an assembly individual; (2) establishing a motion equation of the vehicle in an accelerating outside noise test based on an incoming speed, an outgoing speed and a length of the vehicle regulated by an accelerating outside noise measurement method; (3) when the vehicle is at an x position, measuring predicted sound pressure at a microphone by using a formula; and (4) predicting a sound pressure level of maximum accelerating outside noise. The accelerating outside noise is simulated, predicted, and compared with an outfield measurement and an anechoic chamber through a noise simulation test; and a deviation between a simulation calculation and a measured result is within 2dB (A) so as to meets project requirements.

Description

Technical field: [0001] The invention relates to a method for simulating the noise radiation and decomposing the noise source when the vehicle accelerates, and belongs to the fields of automobile product development, noise control and acoustic signal processing. Background technique: [0002] Accelerated vehicle exterior noise is one of the mandatory items for vehicle certification, and products with excessive noise levels are not allowed to be produced, sold or registered. For the development of automobile products, it is often through the noise test of the prototype car to determine whether the noise meets the standard. When the noise exceeds the standard, the product will be noise-reduced and design improved, thereby increasing the product development cycle and cost. The current control of the noise outside the vehicle during acceleration is post-event and passive control. Invention content: [0003] The purpose of the present invention is to provide a method for simul...

Claims

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Application Information

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IPC IPC(8): G01M17/00
Inventor 卢炳武姜文君赵彤航刘文静王刚吕伟国侯建储昭坦
Owner FAW GROUP
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