内燃机车驾驶室噪声控制

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1、上海交通大学硕士学位论文内燃机车驾驶室噪声控制姓名：庞培森申请学位级别：硕士专业：机械设计及理论指导教师：汪鸿振20060217摘要第三章介绍了噪声控制的常用方法，用传递矩阵法分析了微穿孔板吸声结构的声学特性，并用化双层微穿孔板设计为单层微穿孔板设计的方法设计了双层微穿孔板吸声结构，最后通过声学计算软件Sysnoise进行了吸声效果仿真预测。第四章介绍了振动控制的常用方法，对应用广泛的粘弹性阻尼减振结构的理论及研究方法进行论述，并通过有限元软件，应用模态应变能法和谐响应分析法，对粘弹性约束阻尼结构的减振性能进行了仿真分析。第五章对论文做了总结，并对以后的工作提出建议。关键词：内燃机车，驾驶室

2、，噪声控制，偏相干分析，微穿孔板，约束阻尼IIABSTRACTINTERNALCOMBUSTIONLOCOMOTIVECAB’SNOISECONTROLABSTRACTWiththeincreasingoftrains’velocityandlocomotives’power,thenoiseincabsgrowslarger,eventhatsomecab’snoiseexceedthecriteria.Cab’snoisenotonlyinjuredriver’shealthandpolluteenvironment,butalsoinfluentthesafetyofdriving.T

3、rain’snoisepollutionhasbecomeanimportantconstrainfactor.Thethesispointedatcab’snoisepollution,mainnoisesourceswereidentifiedusingpartialcoherenceanalysismethod.Thetheoryandcalculationofpartialcoherenceanalysiswereexplicated.Tocab’snoise,microperforatedpanel’sacousticcharacterwasanalysesusingtransfe

4、rmatrixmethod.Absorbstructurewasdesignedusingchange2-layerdesigntosinglelayerdesignmethod.AbsorbeffectivenesswasestimatedbyacousticsoftSysnoise.Inordertodecreasecab’svibration,thecharacterofvisco-elasticconstraindampstructuretoabsorbvibrationwascalculatedusingfiniteelementmethod.Inchapterone,thesis

5、’sbackground,significanceandtheIIIABSTRACTdevelopmentofcabnoise’scontrolinandoutofcountryareintroduced.Inchaptertwo,cabnoise’scharacterwasanalyses,aswellasthetheoryandcalculationofpartialcoherenceanalysismethod.Atlastcab’snoisesourceswereidentifiedbypartialcoherenceanalysismethod.Inchapterthree,usu

6、almethodsofnoisecontrolwereintroducedatfirst.Microperforatedpanel’sacousticcharacterwasresearchedusingtransfermatrixmethod.Microperforatedabsorberstructurewasdesignedusingchange2-layerdesigntosinglelayerdesignmethod.Absorber’seffectivenesswasestimatedbyacousticsoftSysnoise.Inchapterfour,methodsofvi

7、brationcontrolwereintroducedatfirst.Theoryandresearchmethodofwidelyusedvisco-elasticconstraindampstructurewerediscussed.Thecharacterofvisco-elasticconstraindampstructuretoabsorbvibrationwascalculatedusingfi