福特汽车NVH噪声）知识培训教材课件.pptVIP

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 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 20HZ~10000HZ frequency range. —声音的频率大体上在20赫兹到10000赫兹之间。 — Characterized by frequency,level 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 0.5HZ~50HZ 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 vibration 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。 NVH ObjectivesNVH的目标 NVH link to customer satisfactionNVH反映了消费者满意的程度 TGR—Press 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” TGR—Things 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有关系的。 NVH Links to Company ProfitNVH关系着公司的利益 15~29% of warranty cost has noise as a condition code. 15~29%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 noise was $346 million –18% of total warranty. 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%。 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） 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,turbulences 零件之间的撞击