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An acoustic one-dimensional analysis method of an exhaust system

An exhaust system and analysis method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of lack of high-precision control procedures and calculation methods, to ensure accuracy, save costs, and improve acoustics The effect of development efficiency

Active Publication Date: 2019-03-05
JIANGLING MOTORS
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Problems solved by technology

[0003] In the early development and design of the exhaust system, many OEMs and exhaust suppliers use GT for acoustic simulation, but lack of high-precision control procedures and calculation methods

Method used

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Embodiment

[0016] Example: see figure 1 with figure 2 .

[0017] An exhaust system acoustic one-dimensional analysis method, the steps are as follows:

[0018] Step 1: According to the pipeline direction of the exhaust system and the structure of the muffler, establish a three-dimensional solid model of the exhaust system in the GEM3D module in the GT software; a. 3D modeling of the muffler: establish the outer contour of the muffler, and establish the insulation Plate, establish the number of perforations in the partition, establish the internal pipes, small holes, and sleeves of the muffler, use the sleeve command to create the sleeve for the muffler with a sleeve structure, and use wool to build the sound-absorbing cotton for the muffler with sound-absorbing cotton; b. Establishment of the external pipeline model: for the single-row exhaust system, according to the outline and relative coordinates of the pipeline, use the command to build the pipeline to build the pipeline. The est...

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Abstract

The invention relates to the automobile exhaust field, in particular to an acoustic one-dimensional analysis method of an exhaust system, which comprises the following steps that 1 according to the pipeline direction of the exhaust system and the structure of a muffler, a three-dimensional solid model of the exhaust system is established in a GEM3D module in a GT software; 2 after the 3D model isestablished, the related parameters of the model are defined in detail; 3 an engine is used as a noise source to carry out one-dimensional engine model checking; 4 the 3D model of the exhaust system is discretized into a one-dimensional model, which is combined with the engine model and the intake system model to form a complete intake system-engine-exhaust system analysis model, and then the noise at the exhaust tailpipe nozzle is analyzed; 5 the total value of overall and the second, fourth, and sixth order noise of the exhaust system is extracted for the real vehicle verification. The method of the invention guarantees the accuracy of the model, improves the acoustic development efficiency of the exhaust system, and saves the exhaust development cycle and cost.

Description

technical field [0001] The invention relates to the field of automobile exhaust, in particular to an acoustic one-dimensional analysis method of an exhaust system. Background technique [0002] With the development of society and the advancement of technology, people have higher and higher requirements for modern cars. In particular, the noise and vibration problems of automobiles have attracted more attention. Exhaust noise is one of the main noise sources of a car, which will spread into the car through the air and directly affect the feeling and comfort of passengers. Among the exhaust noise, the low-frequency exhaust noise has the greatest impact on people. Therefore, it is necessary to design the muffler to reduce the exhaust noise, so that the exhaust noise meets the NVH design target, thereby ensuring the NVH level of the vehicle. [0003] In the early development and design of the exhaust system, many OEMs and exhaust suppliers use GT for acoustic simulation, but ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/20
Inventor 林胜吴赵生苏伟辉李少杰
Owner JIANGLING MOTORS
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