- 1、本文档共75页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
排气系统exhaust_p1
* The noise shown directly relates with rpm Noise attenuation of muffler/resonator directly relates with frequency Thus, relation between noise curves and frequency must be established Frequency = engine speed/20 The tailpipe noise is dominated by 3rd order and 6th order, so the Insertion Loss for each order can be established. Tuning of Tailpipe Noise Attenuation * Insertion Loss for 3rd Order Noise 75 Hz 250 Hz After adding mufflers/resonators, if the IL target is reached, the tailpipe noise will reach the target at most rpm Tuning of Tailpipe Noise Attenuation * 300 Hz It the target is reached, the noise at 3000 rpm peak will be reduced Insertion Loss for 6th Order Noise Tuning of Tailpipe Noise Attenuation * 75 Hz muffler is used to kill the noise peak at 1500 rpm 发动机 75Hz Tuning of Tailpipe Noise Attenuation The noise peak at 1500 rpm (75Hz) is attenuated * 75 Hz muffler is used to kill the noise peak at 1500 rpm 250 Hz muffler is used to kill the noise peak at 5000 rpm 发动机 75Hz 250Hz Tuning of Tailpipe Noise Attenuation * 75 Hz muffler is used to kill the noise peak at 1500 rpm 250 Hz muffler is used to kill the noise peak at 5000 rpm 300 Hz muffler is used to kill the noise peak at 3000 rpm 发动机 75Hz 250Hz 300Hz Tuning of Tailpipe Noise Attenuation * Continuously add tuner (quarter wave tuner or dissipative material) to kill the rest peaks The target is usually have +/-2 dB variation The status is still higher than the target Tuning of Tailpipe Noise Attenuation * Both noise and power loss are desired to be minimized However, more noise reduction will increase more power loss Two Key Parameters in Exhaust System Design Low power loss: the backpressure must be reduced simple muffler less restriction --- increase tailpipe noise Low noise Large mufflers More restriction in muffler --- increase power loss Tailpipe noise and power loss is a conflict pair. They must be traded off. Example: Camry (Toyota): quite, 11% power loss Taurus (Ford): loud, 6% p
您可能关注的文档
- 戴尔公司物流方案设计0702.doc
- 房地产开发9-10章.ppt
- 戴尔2010上海体验店规划方案.ppt
- 房屋内部3D模型.ppt
- 我国房地产税收与住房价格的关系研究_1659145612.doc
- 房颤与猝死致病新基因NUP155的发现_王擎.ppt
- 手机银行使用指南及常见疑难解答20100926.doc
- 手绘效果图3讲义.doc
- 手机维修培训20100110.ppt
- 手工书55招.ppt
- 《GB/Z 44363-2024致热性 医疗器械热原试验的原理和方法》.pdf
- GB/T 16716.6-2024包装与环境 第6部分:有机循环.pdf
- 中国国家标准 GB/T 44376.1-2024微细气泡技术 水处理应用 第1 部分:亚甲基蓝脱色法评价臭氧微细气泡水发生系统.pdf
- 《GB/T 44376.1-2024微细气泡技术 水处理应用 第1 部分:亚甲基蓝脱色法评价臭氧微细气泡水发生系统》.pdf
- GB/T 44376.1-2024微细气泡技术 水处理应用 第1 部分:亚甲基蓝脱色法评价臭氧微细气泡水发生系统.pdf
- 中国国家标准 GB/T 44315-2024科技馆展品设计通用要求.pdf
- GB/T 44305.2-2024塑料 增塑聚氯乙烯(PVC-P)模塑和挤塑材料 第2部分:试样制备和性能测定.pdf
- 《GB/T 44315-2024科技馆展品设计通用要求》.pdf
- GB/T 44315-2024科技馆展品设计通用要求.pdf
- GB/T 39560.9-2024电子电气产品中某些物质的测定 第9 部分:气相色谱-质谱法(GC-MS)测定聚合物中的六溴环十二烷.pdf
文档评论(0)