CN111079321A - Exhaust system silencer radiation noise calculation method - Google Patents
Exhaust system silencer radiation noise calculation method Download PDFInfo
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- CN111079321A CN111079321A CN201811219992.1A CN201811219992A CN111079321A CN 111079321 A CN111079321 A CN 111079321A CN 201811219992 A CN201811219992 A CN 201811219992A CN 111079321 A CN111079321 A CN 111079321A
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Abstract
A method for calculating radiation noise of a silencer of an exhaust system comprises the following steps: s1: extracting a static pressure curve of each cavity in the silencer to be analyzed from simulation software; s2, preprocessing the conversion tool completed in the development of the analysis process, and converting the static pressure into frequency spectrum excitation; s3, carrying out finite element modeling on the silencer and carrying out frequency response calculation; s4, extracting a calculation result, and synthesizing the calculation result into a waterfall graph and a total sound pressure curve; s5, evaluating the total sound pressure curve and the waterfall chart, if the total sound pressure curve and the waterfall chart do not pass through, returning to the adjusting structure, and starting the evaluation again from the step S1; if the noise passes, the step of analyzing the radiated noise of the silencer is completed, and the manufacturing stage of the sample piece is started. Compared with the prior art, the method improves the identification capability of the early-stage risks of the silencer development, simplifies the original development process depending on tests and repeated iteration, and saves the development cost and time.
Description
Technical Field
The invention relates to a method for calculating radiation noise of a silencer of an exhaust system, and belongs to the technical field of engine exhaust systems.
Background
The conventional exhaust system muffler radiation noise control is generally: in the early stage, the dynamic characteristic of the shell is known through modal analysis of the silencer shell, and resonance caused by excitation of an engine and airflow is avoided by a method of raising the modal frequency of the shell as much as possible. And in the later stage, the silencer sample piece is manufactured and installed on a sample car for actual measurement, if the radiated noise is found to be large, the acoustic structure is changed again, and the sample piece is remade for retesting.
Although the traditional evaluation mode of the radiated noise of the exhaust system muffler can be normally developed, due to the shortage of the means, the traditional evaluation mode has some obvious defects:
the early evaluation means is lack, only modal frequency can be passed, and the mode frequency cannot be used as exact reference, except the condition of very poor performance, the problem of radiation noise of the silencer is difficult to detect in the early stage;
later stage iteration cost is too high, in case radiation noise problem appears, needs readjust the structure, makes the sample, tests again, and still has the risk that the experiment is not passed, and iteration is repeated, and time and cost are all higher.
How to effectively identify risks in the early stage, which can reduce the time for finding the risks through real vehicle verification and reduce the development cost brought by sample manufacturing and test arrangement, is a technical problem to be solved in the industry.
Disclosure of Invention
The invention aims to provide a method for calculating the radiation noise of a silencer of an exhaust system, which can save development cost and time.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for calculating radiation noise of a silencer of an exhaust system comprises the following steps:
s1: extracting a static pressure curve of each cavity in the silencer to be analyzed from simulation software;
s2, preprocessing the conversion tool completed in the development of the analysis process, and converting the static pressure into frequency spectrum excitation;
s3, carrying out finite element modeling on the silencer and carrying out frequency response calculation;
s4, extracting a calculation result, and synthesizing the calculation result into a waterfall graph and a total sound pressure curve;
s5, evaluating the total sound pressure curve and the waterfall chart, if the total sound pressure curve and the waterfall chart do not pass through, returning to the adjusting structure, and starting the evaluation again from the step S1; if the noise passes, the step of analyzing the radiated noise of the silencer is completed, and the manufacturing stage of the sample piece is started.
As a further improved technical scheme of the invention, the exhaust system muffler radiation noise calculation method identifies risks in the step of acoustic development.
As a further improved technical scheme of the invention, the simulation software comprises GT-Power software and Wave or CFD simulation software.
As a further improved technical solution of the present invention, in step S3, the step of performing finite element modeling on the muffler includes a muffler structure and an external sound field.
As a further improvement of the present invention, in step S4, the sound pressure of the sound field outside the muffler and other physical quantities calculated from the sound pressure are extracted as a result.
As a further improved technical scheme of the invention, a sample does not need to be prepared in the method for calculating the radiation noise of the exhaust system silencer.
As a further improvement of the present invention, in step S2, the static pressure is converted into the spectral excitation by Fast Fourier Transform (FFT).
Compared with the prior art, the method for calculating the radiation noise of the exhaust system silencer not only considers the characteristics of the engine by extracting the acoustic simulation result, but also considers the dynamic characteristics of the silencer by calculating the acoustic finite element, thereby saving the development cost and time.
Drawings
Fig. 1 is a development flow of radiation noise of a conventional exhaust system muffler.
Fig. 2 is a development flow of the radiation noise of the muffler of the exhaust system of the present invention.
Fig. 3 is a muffler radiation noise analysis flow.
Detailed Description
Referring to fig. 2, the present invention discloses a development process of radiated noise of an exhaust system muffler, which includes a step of muffler development, a step of acoustic development, a step of sample fabrication, and a step of real vehicle verification, wherein the step of acoustic development includes a method for calculating the radiated noise of the exhaust system muffler.
Compared with the prior art, the development process of the radiation noise of the exhaust system silencer needs testing and structural adjustment in advance, and risk identification is carried out in the acoustic development step of early analysis as much as possible. By excluding and optimizing the risks in advance in a calculation mode, the final development result basically does not generate the risk of repeated iteration, and the optimized structure can obtain better radiation noise performance.
Referring to fig. 3, the method for calculating the radiation noise of the muffler of the exhaust system according to the present invention includes the following steps:
s1: extracting a static pressure curve of each cavity in the silencer to be analyzed from simulation software;
s2, preprocessing the static pressure by a conversion tool completed in the development of an analysis process, and converting the static pressure into frequency spectrum excitation by FFT (fast Fourier transform);
s3, carrying out finite element modeling on the silencer and carrying out frequency response calculation;
s4, extracting a calculation result, and synthesizing the calculation result into a waterfall graph and a total sound pressure curve;
s5, evaluating the total sound pressure curve and the waterfall chart, if the total sound pressure curve and the waterfall chart do not pass through, returning to the adjusting structure, and starting the evaluation again from the step S1; if the noise passes, the step of analyzing the radiated noise of the silencer is completed, and the manufacturing stage of the sample piece is started.
In step S1, the simulation software includes GT-Power software, Wave or CFD simulation software (e.g., Fluent, Star CCM +, etc.). Step S1 is to extract excitation information in the muffler from the simulation software.
In step S3, the step of finite element modeling for the muffler includes a muffler structure and an external sound field, i.e., the computational model includes a finite element model of the muffler and the external sound field.
In step S4, the result is extracted as the sound pressure of the sound field outside the muffler and other physical quantities calculated from the sound pressure.
Compared with the prior art, the method for calculating the radiation noise of the exhaust system silencer not only considers the characteristics of the engine by extracting the acoustic simulation result, but also considers the dynamic characteristics of the silencer by calculating the acoustic finite element, and a sample does not need to be prepared in the step, so that the development cost and time are saved. According to the invention, by developing a simulation method aiming at the radiation noise of the silencer of the exhaust system, the identification capability of the early-stage risk of the silencer development is improved, the original development process depending on the test and the repeated iteration is simplified, the development efficiency is improved, and the cost of the repeated sample piece manufacturing and testing is saved.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.
Claims (7)
1. A method for calculating radiation noise of a silencer of an exhaust system comprises the following steps:
s1: extracting a static pressure curve of each cavity in the silencer to be analyzed from simulation software;
s2, preprocessing the conversion tool completed in the development of the analysis process, and converting the static pressure into frequency spectrum excitation;
s3, carrying out finite element modeling on the silencer and carrying out frequency response calculation;
s4, extracting a calculation result, and synthesizing the calculation result into a waterfall graph and a total sound pressure curve;
s5, evaluating the total sound pressure curve and the waterfall chart, if the total sound pressure curve and the waterfall chart do not pass through, returning to the adjusting structure, and starting the evaluation again from the step S1; if the noise passes, the step of analyzing the radiated noise of the silencer is completed, and the manufacturing stage of the sample piece is started.
2. The exhaust system muffler radiation noise calculation method according to claim 1, wherein: the exhaust system muffler radiation noise calculation method identifies risks in the step of acoustic development.
3. The exhaust system muffler radiation noise calculation method according to claim 1, wherein: the simulation software comprises GT-Power software and Wave or CFD simulation software.
4. The exhaust system muffler radiation noise calculation method according to claim 1, wherein: in step S3, the step of finite element modeling for the muffler includes the muffler structure and the external sound field.
5. The exhaust system muffler radiation noise calculation method according to claim 4, wherein: in step S4, the result is extracted as the sound pressure of the sound field outside the muffler and other physical quantities calculated from the sound pressure.
6. The exhaust system muffler radiation noise calculation method according to claim 1, wherein: according to the method for calculating the radiation noise of the exhaust system silencer, a sample does not need to be prepared.
7. The exhaust system muffler radiation noise calculation method according to claim 1, wherein: in step S2, the static pressure is converted into the spectral excitation by a Fast Fourier Transform (FFT).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811219992.1A CN111079321A (en) | 2018-10-19 | 2018-10-19 | Exhaust system silencer radiation noise calculation method |
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| CN201811219992.1A CN111079321A (en) | 2018-10-19 | 2018-10-19 | Exhaust system silencer radiation noise calculation method |
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| CN111079321A true CN111079321A (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113343542A (en) * | 2021-07-14 | 2021-09-03 | 义乌吉利动力总成有限公司 | Optimal design method of intake manifold and intake manifold |
Citations (3)
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| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| JP2017166995A (en) * | 2016-03-16 | 2017-09-21 | 住友ゴム工業株式会社 | Evaluation method of noise performance of tire |
| CN108021750A (en) * | 2017-12-04 | 2018-05-11 | 北京理工大学 | A kind of internal combustion engine radiated noise method of tire for considering human hearing characteristic |
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2018
- 2018-10-19 CN CN201811219992.1A patent/CN111079321A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| JP2017166995A (en) * | 2016-03-16 | 2017-09-21 | 住友ゴム工業株式会社 | Evaluation method of noise performance of tire |
| CN108021750A (en) * | 2017-12-04 | 2018-05-11 | 北京理工大学 | A kind of internal combustion engine radiated noise method of tire for considering human hearing characteristic |
Non-Patent Citations (1)
| Title |
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| 陈启林: "水下燃气射流数值仿真与试验研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113343542A (en) * | 2021-07-14 | 2021-09-03 | 义乌吉利动力总成有限公司 | Optimal design method of intake manifold and intake manifold |
| CN113343542B (en) * | 2021-07-14 | 2023-01-31 | 义乌吉利动力总成有限公司 | Optimal design method of intake manifold and intake manifold |
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Application publication date: 20200428 |