NVH_noise vibration harshness_噪声和振动控制工程(福特汽车).ppt

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1、NVH(noisevibrationharshness)噪声和振动控制工程VehicleNVHAwarenessD.Griffiths1SummaryFlowChart流程总图VehicleNVHAwareness2.1VehicleLevelPowertrainNVHBackground背景Issues结果Targets指标参数Trends趋向Categorization目录Customerconcerns用户关注的问题Phenomena现象Op.cond工作状态Sources来源Alignment列表Targetsetting物体位置Proc

2、ess方法Parametric参数模型NPAmodel-mech.noise噪声路径分析模型-机械噪声NPAmodel-airbornenoise噪声路径分析模型-空气噪声Bodysensitivity&Modes车身灵敏度和样式Soundpackagecapability消音性能MechanicallyTrans.Force机械传动产生的力Resonance共振Force&vibrationinputs施加的力和振动Frequencyalignment频率表Historicproblem老问题AirborneNoiseSources空气传播的噪

3、声来源Powerplant做功设备Induction进气Exhaust排气2Background背景Issues问题-Sound-Loudness/speechinterference-声音-响度/语音干涉-Soundqualityonasneededbasisduringdevelopment在改善音质的过程中依据的原理-Vibration-velocityoracceleration振动-速度或者加速度Trends:competitionissteadilyimproving趋向：竞争越来越激烈VehicleNVHAwareness32.1V

4、ehicleLevelPowertrainNVHCustomerConcerns顾客关心的问题General-P/TNVHisdefinedastheNVHthecustomerascribestopowertrainsources,usuallybecauseofOperatingcondition(e.g..idleorwot)P/T振动和噪声的协调性被如此定义的原因，用户认为是由于噪声和振动是动力装置所产生，而噪声与振动通常是与运行工况密切相关的（例如…空转）EngineeringDefinition工程上的解释Vehiclepowertr

5、ainNVHisanyvehiclenoiseorvibrationduetopowertrainexcitationincludinginduction,exhaustandtailpipesources车辆动力装置的噪声和振动问题是由于动力装置的激励产生的包括进排气和排气管的激励。VehicleNVHAwareness42.1VehicleLevelPowertrainNVH-CategorizationP/TNVHPhenomenaP/T噪声和振动表现出的一些现象VehicleNVHAwarenessBoom轰隆声Lowfrequencys

6、ound20-80Hz低频声音20-80HzClunk沉闷声Transient,lowfrequency,broadband瞬时的，低频，宽带Drone嗡嗡声Largeamplitudesingletone,100-200hz大振幅，单音调，100-200HzGrowl咆哮声Broadband,100-1000hz,noticeabletimevariation宽频带，100-1000hz，明显的随时间变化Moan呼啸声Lowamplitudetone,80-200hz小振幅，80-200HzPTperiodsSoundpeaksduetores

7、onance由于共振，声音达到峰值Rattle咔嗒声Randomimpactnoise杂乱的冲击噪声Rumble隆隆声Lowtomid-frequencybroadbandnoise,100-500hzwithtimevariation低中频的宽频噪声100-500Hz，随时间而变化Tick&Hash滴答声Miscellaneoustimevaryingnoise杂乱的，随时间变化的噪声Whine呜呜声Midtohighfrequencysound,200-2000hz,toneanharmonics中高频声音，200-2000hz，和声52.1

8、VehicleLevelPowertrainNVH-CategorizationShake,Roughness,Boom,Moan振动，