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1、1.1 NVH Overview NVH 概论,Ford Motor Company Vehicle Attributes Engineering 福特汽车公司整车设计部门,Vehicle NVH Awareness,J.Juan/M.Haffey,1,What is NVH? 什么是NVH呢？,Noise-what the customer hears噪声- 指的是顾客所能听到的声音 Sound mainly in the 20HZ10000HZ frequency range. 声音的频率大体上在20赫兹到10000赫兹之间。 Characterized by frequency,leve
2、l and quality. 通过频率、级别和音质来描述。 Vibration-What the customer fells and sees.振动-指的是顾客所感觉到的和看到的。 Motion sensed by the body mainly in the 0.5HZ50HZ frequency range. 身体所能感知运动的频率范围通常在0.5赫兹到50赫兹之间。 Characterized by frequency,level and direction. 通过频率、振幅和方向来描述。 Harshness-Combined effects of noise and vibratio
3、n不舒适性-指的是噪声和振动的综合影响。 Rough,grating or discordant sensations. 粗野的，刺耳的或不和谐的感觉。,Vehicle NVH Awareness,1.1 NVH Overview,2,NVH must fulfill legal requirements.NVH必须满足法定的要求。 NVH should provide the acoustical/tactile feedback for safe and confident driving.NVH应该使乘员在驾驶方面有安全和自信的感觉。Link to operating condition
4、s. 在各种操作环境。Connection to earth.在各种路面。 NVH should avoid any negative perception.NVH应该避免任何不好的感觉。unpleasant ,unrefined ,unexpected ,and annoying events.令人不愉快的，粗俗的，意料之外的和令人讨厌的事情。 NVH can exceed customer expectations.NVH应该能超过顾客的期望值。,Vehicle NVH Awareness,1.1 NVH Overview,3,NVH Objectives NVH的目标,NVH link
5、to customer satisfaction NVH反映了消费者满意的程度,TGRPress review(examples)TGR媒体评论（例如）“Fiesta has a surprisingly quiet & well refined engine”“ Fiesta有一台令人惊讶的安静而且舒适的发动机”“F150 ride is smooth quiet with the 4.6 L”“F150乘坐舒适安静的4.6升发动机汽车”TGRThings Gone Wrong 20%30% of TGW is NVH related.TGR所抱怨的事情20%30%抱怨的产生都是与NVH有关
6、系的。,Vehicle NVH Awareness,1.1 NVH Overview,4,Vehicle NVH Awareness,1.1 NVH Overview,5,NVH Links to Company Profit NVH关系着公司的利益,1529% of warranty cost has noise as a condition code.1529%的保修的费用是花费在与噪声有关的。 1994 model year,36MIS,warranty cost associated with all noisewas $346 million 18% of total warrant
7、y.94年型车，3年的在用车，在噪声方面的保修费用是3.46亿美元占总费用的18%。,Vehicle NVH Awareness,1.1 NVH Overview,6,NVH Links to Company Profit NVH关系着公司的利益,NVH Prototype cost reduction opportunity.COMBINED COST BREAKDOWN PROTOTYPE COST CONTRIBUTION综合成本明细 样机花费的组成(TASE+SAFETY+NVH)（TASE+安全设备+NVH）,Total Cost=$303M (Base on TASE,Safety
8、,NVH Cost of Attribute Studies 总支出=3.03亿美元 （基于TASE，安全，NVH的研究费用）,Vehicle NVH Awareness,1.1 NVH Overview,7,Sound Generation Mechanism 产生噪声的原理,Multiple mechanisms generate a variability of vehicle sound.汽车所产生噪声的原理是多种多样的。 Combustion Airflow,pumping 燃烧 气流，进排气 Impacts between components Airflow,turbulence
9、s 零件之间的撞击 气流，(液体或气体的)紊乱 Friction contact of components Surface roughness 构件之间的摩擦 粗糙的表面 Rotating parts Unbalance masses旋转的部件 不平衡块 Flow in pipes Tire force variation 在管中的流动 轮胎压力的变化,Vehicle NVH Awareness,1.1 NVH Overview,8,Vehicle Sounds 汽车的噪声,Combustion noise wind noise Gear rattle Bearing knock 燃烧的噪声
10、 风的噪声 齿轮传动的声音 轴承的敲击声 Diesel knocking Sunroof noise Gear whine Electric windows 柴油机的敲击声 遮阳顶棚的噪声 齿轮的声音 电动窗的噪声 Valve train Door slam Gear lever tizz Tire noise 气阀机构的噪声 门的砰的声音 变速杆换档的噪声 轮胎的噪声 FEAD noise Central locking Driveline clonk Exhaust noise FEAD噪声 中央门锁的噪声 动力传动系统的噪声 排气噪声 PAS noise Switch noise Dri
11、veline thrash Squeaks and rattles 动力转向系统的声音 开关的噪声 动力传动系统的噪声 吱吱声和喀嚓声 Fuel pump noise Indicator ticking Road noise Water splash noise燃油泵的噪声 指示器的滴答声 道路的噪声 水溅的噪声 Alternator whine Windscreen wipe noise Impact harshness Intake noise 交流发电机的噪声 挡风玻璃的噪声 撞击振动声 通风口的噪声,Vehicle NVH Awareness,1.1 NVH Overview,9,NVH Phenomena NVH现象,OPERATING CONDITION 操作环境,DESCRIPTION 描述,SOURCE资源,Pass-By Deceleration Cruise Acceleration Idle Staring,BoomRumbleGrowlWhineRattleSqueal Hiss,EngineTransmissionExhaust/intakeRoadWindTire,Vehicle NVH Awareness,1.1 NVH Overview,10,Vehicle Noise Examples 汽车的噪声举例,
