某型抓料机噪声测量分析与控制

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1、西南交通大学硕士学位论文某型抓料机噪声测量分析与控制姓名：张德满申请学位级别：硕士专业：车辆工程指导教师：董大伟20080401西南交通大学硕士研究生学位论文第Ⅱ页AbstractInordertodeploitationthemarketofinternational，theWYZmachinesCallnotsatisfythenewestnoiselimitstanderdofEurope．andneedtobereducedmore．OneZhonggongLtd．andSouthwestJaotongu

2、niversityaffordedconditiontomeasurethenoiseofthecabofWYZmachinesoutsideandinsideandthevibrationofWYZmachines’Sbodyinlocale．thismeasurecanaffordtrustinessgistforthechoiceanddesignofreducenoise．Bythecompute，thenoiseoutsideWYZmachinesis4．8dBhigherthannoiselimits

3、tanderdofEurope．Theoutsidenoisemostlycomposedbytwoparts．120．5Hzandthenoisewiththemostimportantpartof392Hz．Byfregueneyanalysisandthefactualconfigurationofthemathine，wecanestimatethenoisewith120．5Hzspreadedfrommufflerofengine．andthenoisewiththemostimportantpart

4、of392Hzspreadedfromhydraulicpressuresystern．Freguencyanalysisindicatethatoutsidenoisemostlycomposedbythemiddleandlowfreguencynoise．themostimportpartis120．5Hzandthenoisewiththemostimportantpartof392Hzandbreathof1000Hz．Baseonthefreguencycharacteristicofthenoise

5、andpracticabilitydemandofengineering，choosetinyperforationsyntonystructureasthemeasuretoreducethefregnencyof120．5Hzand392Hzofoutsidenoiseseparately．Textmakeuseofthemethodofoptimizationdesign，withtheoptimizationfunctionofabsorptioncoefficientin120．5Hzand392Hz，

6、computeouttheoptimizationstructureparameterofthetinyperforationsyntonystructure．thisstructureCanaimattheoutsidenoiseofcertainmachinestoabsorption．TheoreticallyitCanwholehogreducetheoutsidenoise．BaseonthereverberationCOe衔cientoftinyperforationsyntonystructurea

7、ndthenoisesignalprereduce，Cancomputeoutthenoisereducedbythetinyperforationsyntonystructuretheoretically,andthencomputeouttheoutsidenoiseafterreducediS100．0dB．ThisnoiseafterreduceCanaccordwithnewestnoiselimitstanderdofEurope．Keywordsnoise，engineeringmachine，op

8、timizationdesign，microperforated-panel西南交通大学学位论文版权使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定，同意学校保留并向国家有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权西南交通大学可以将本学位论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存和汇编本学位