汽车车外噪声仿真分析.doc
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汽车车外噪声仿真分析,2万字，包括详细仿真程序自己原创的毕业论文，已经通过校内系统检测，重复率低，仅在本站独家出售，大家放心下载使用摘要 汽车车外噪声是汽车nvh性能的重要指标之一，也是国家为改善环境噪声关注的重点项目之一。很多国家都制定相关的条例和法规，希望能通过这种方法促使汽车噪声降低。强制性噪声限值标准的提高，对汽...
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汽车车外噪声仿真分析
2万字，包括详细仿真程序
自己原创的毕业论文，已经通过校内系统检测，重复率低，仅在本站独家出售，大家放心下载使用
摘要 汽车车外噪声是汽车NVH性能的重要指标之一，也是国家为改善环境噪声关注的重点项目之一。很多国家都制定相关的条例和法规，希望能通过这种方法促使汽车噪声降低。强制性噪声限值标准的提高，对汽车的产品开发研究提出了更高要求，从而促使了汽车技术的不断进步。合理选择噪声源并建立预测模型，快速有效的进行声辐射模拟与贡献率排行，对于汽车产品的降噪工作将具有重要的指导作用。
首先依据一般情况，将发动机、排气和驱动桥作为主要噪声源，将其视作点声源，通过Matlab软件仿真出，在距车7.5米远，高1.2米处接收点的车外噪声声压级。然后再进行车外噪声测试，获取汽车通过噪声数据，验证该模型建立正确。该模型只需输入汽车噪声源位置参数，到达始端线的速度和该噪声源的近场噪声声压值，就可以得出远场测点的声压值，仿真出的数据准确度高。该模型不仅适用于实验车辆。对其他车辆也同样适用。
关键词：汽车 车外噪声预测 噪声源 点声源
Simulation analysis of vehicle pass-by noise
Abstract Automotive vehicle noise is one of the important indicators of automotive NVH performance, as well as one of the key projects which is aimed to improve the environmental noise. For this reason, many countries have developed regulations to reduce vehicle noise. The improved mandatory standards of noise limits have proposed a higher requirement for product research and development which contributed to the progress of automotive technology. Selecting reasonable noise sources and building predictive models, carrying out simulation of acoustic radiation efficiently and ranking the acoustic radiation contribution rate, all of which may have an important role in guiding automotive products for noise reduction.
Firstly, according to the general case, the engine, exhaust and drive axle , which are seen as point sources, are the main sources of noise. Then，through Matlab the noise level of the receiving point which was 7.5 meters away from the car and 1.2 meters high from the ground was simulated. Finally, vehicle noise tests conducts to get the car through the noise, in order to verify whether the model is correct or not. As long as inputting the parameters of the noise source of the car, the speed when reached the beginning line and the near-field noise sound pressure level of the noise source to the model, the far-field noise sound pressure can be drawn and has high accuracy. The model is not only applicable to the experimental vehicle, but also applies to other vehicles.
Key words Vehicle pass-by noise Forecast Noise source Point source
目录
第一章 绪论 2
1.1 研究意义 2
1.2 国内外噪声法规 2
1.2.1 ECE通过噪声法规及其发展...................................3
1.2.2 国内车辆通过噪声法规发展 4
1.3 国内外通过噪声发展现状 5
1.3.1 我国汽车通过噪声模拟研究..................................6
1.3.2 国外汽车通过噪声模拟研究..................................7
1.4 本文研究内容 7
第二章 车辆通过噪声分析 9
2.1 汽车噪声源分析 9
2.2 发动机噪声产生机理 9
2.2.1 发动机空气动力噪声........................................10
2.2.2 发动机表面辐射噪声........................................12
2.3 传动系噪声产生机理 13
2.3.1 齿轮噪声..................................................13
2.3.2 轴承噪声..................................................14
2.3.3 传动轴噪声................................................14
2.4 轮胎噪声产生机理 .....14
2.5 其他噪声产生机理 14
2.5.1 制动噪声..................................................14
2.5.2 车身振动噪声..............................................15
2.6 本章小结 15
第三章 汽车车外噪声仿真 16
3.1 汽车车外噪声预测模型 16
3.2 预测模型仿真分析 18
3.2.1 时域预测..................................................18
3.2.2 频域分析..................................................21
3.3 本章小结 26
第四章 汽车加速噪声测试 27
4.1 加速行驶车外噪声测试方法 27
4.1.1 实验仪器.................................................27
4.1.2 测试条件..................................................28
4.1.3 测试方法..................................................28
4.2 实验方案概述 29
4.3 整车噪声测试 30
4.4 仿真结果分析 31
4.4.1 主要噪声源分析............................................31
4.4.2预测模型和实际测量对比分析................................32
4.5本章小结 34
第五章 总结和展望 35
5.1工作总结 35
5.2工作展望 35
致谢 37
参考文献 38
附录 39
附录A 匀加速工况整车噪声时域仿真程序 39
附录B 匀加速工况整车噪声频域仿真程序 41
附录C 匀速工况整车噪声时域仿真程序 43
附录D 匀速工况整车噪声频域仿真程序 45
2万字，包括详细仿真程序
自己原创的毕业论文，已经通过校内系统检测，重复率低，仅在本站独家出售，大家放心下载使用
摘要 汽车车外噪声是汽车NVH性能的重要指标之一，也是国家为改善环境噪声关注的重点项目之一。很多国家都制定相关的条例和法规，希望能通过这种方法促使汽车噪声降低。强制性噪声限值标准的提高，对汽车的产品开发研究提出了更高要求，从而促使了汽车技术的不断进步。合理选择噪声源并建立预测模型，快速有效的进行声辐射模拟与贡献率排行，对于汽车产品的降噪工作将具有重要的指导作用。
首先依据一般情况，将发动机、排气和驱动桥作为主要噪声源，将其视作点声源，通过Matlab软件仿真出，在距车7.5米远，高1.2米处接收点的车外噪声声压级。然后再进行车外噪声测试，获取汽车通过噪声数据，验证该模型建立正确。该模型只需输入汽车噪声源位置参数，到达始端线的速度和该噪声源的近场噪声声压值，就可以得出远场测点的声压值，仿真出的数据准确度高。该模型不仅适用于实验车辆。对其他车辆也同样适用。
关键词：汽车 车外噪声预测 噪声源 点声源
Simulation analysis of vehicle pass-by noise
Abstract Automotive vehicle noise is one of the important indicators of automotive NVH performance, as well as one of the key projects which is aimed to improve the environmental noise. For this reason, many countries have developed regulations to reduce vehicle noise. The improved mandatory standards of noise limits have proposed a higher requirement for product research and development which contributed to the progress of automotive technology. Selecting reasonable noise sources and building predictive models, carrying out simulation of acoustic radiation efficiently and ranking the acoustic radiation contribution rate, all of which may have an important role in guiding automotive products for noise reduction.
Firstly, according to the general case, the engine, exhaust and drive axle , which are seen as point sources, are the main sources of noise. Then，through Matlab the noise level of the receiving point which was 7.5 meters away from the car and 1.2 meters high from the ground was simulated. Finally, vehicle noise tests conducts to get the car through the noise, in order to verify whether the model is correct or not. As long as inputting the parameters of the noise source of the car, the speed when reached the beginning line and the near-field noise sound pressure level of the noise source to the model, the far-field noise sound pressure can be drawn and has high accuracy. The model is not only applicable to the experimental vehicle, but also applies to other vehicles.
Key words Vehicle pass-by noise Forecast Noise source Point source
目录
第一章 绪论 2
1.1 研究意义 2
1.2 国内外噪声法规 2
1.2.1 ECE通过噪声法规及其发展...................................3
1.2.2 国内车辆通过噪声法规发展 4
1.3 国内外通过噪声发展现状 5
1.3.1 我国汽车通过噪声模拟研究..................................6
1.3.2 国外汽车通过噪声模拟研究..................................7
1.4 本文研究内容 7
第二章 车辆通过噪声分析 9
2.1 汽车噪声源分析 9
2.2 发动机噪声产生机理 9
2.2.1 发动机空气动力噪声........................................10
2.2.2 发动机表面辐射噪声........................................12
2.3 传动系噪声产生机理 13
2.3.1 齿轮噪声..................................................13
2.3.2 轴承噪声..................................................14
2.3.3 传动轴噪声................................................14
2.4 轮胎噪声产生机理 .....14
2.5 其他噪声产生机理 14
2.5.1 制动噪声..................................................14
2.5.2 车身振动噪声..............................................15
2.6 本章小结 15
第三章 汽车车外噪声仿真 16
3.1 汽车车外噪声预测模型 16
3.2 预测模型仿真分析 18
3.2.1 时域预测..................................................18
3.2.2 频域分析..................................................21
3.3 本章小结 26
第四章 汽车加速噪声测试 27
4.1 加速行驶车外噪声测试方法 27
4.1.1 实验仪器.................................................27
4.1.2 测试条件..................................................28
4.1.3 测试方法..................................................28
4.2 实验方案概述 29
4.3 整车噪声测试 30
4.4 仿真结果分析 31
4.4.1 主要噪声源分析............................................31
4.4.2预测模型和实际测量对比分析................................32
4.5本章小结 34
第五章 总结和展望 35
5.1工作总结 35
5.2工作展望 35
致谢 37
参考文献 38
附录 39
附录A 匀加速工况整车噪声时域仿真程序 39
附录B 匀加速工况整车噪声频域仿真程序 41
附录C 匀速工况整车噪声时域仿真程序 43
附录D 匀速工况整车噪声频域仿真程序 45
