演讲主题：

传动系统噪声、振动和声振粗糙度（NVH）的整合和优化。

演讲人介绍：

1988: 在西北工业大学获得机械工程学士

1991: 在西北工业大学获得声学工程、噪声、振动控制硕士学位

1991~1996: 在西北工业大学担任讲师

2000: 在北卡罗来纳州立大学获得机械工程博士学位

2000 ~ 2010: 在北美轴制造公司担任噪声、振动和声振粗糙度高级工程师

2010至今: 在北美轴制造公司担任技术工程主管

他在噪声、振动控制方面具有20多年的工作经验，已经出版40多部出版物，受邀参加众多会议和其它活动并发表演讲。现在，他拥有五项美国专利，另三项专利正在申请中。他现在的工作内容和专攻的方向是汽车传动噪声、振动和声振粗糙度。

演讲摘要：

如今方兴未艾的四轮驱动和全轮驱动动力传动系统架构已经在降低动力传动系统噪音方面对工程师们带来了全新的挑战。与此同时，工程师们亦不断面临来自日益严格的噪音水平要求。动力传动系统噪声、振动和声振粗糙度不仅涉及驾驶舒适感问题，更为重要的是，其通常与消费者对汽车质量以及巨额成本的感受具有千丝万缕的关系。

本演讲对成功实现动力传动系统与汽车的整合所需的噪声、振动和声振粗糙度工程策略和工艺进行讨论。任何噪声、振动和声振粗糙度问题都是源路径响应器系统的问题，所以，需要采取不同途径和策略解决各部分问题，这将通过图文并茂的方式进行讨论。通过实例对涉及始设备制造商和供应商协助问题的系统整合的重要性进行讨论。噪声、振动和声振粗糙度整合的另一个重要方面就是在与噪声、振动和声振粗糙度性能相关的各种相互矛盾的必要设计事项之间实现平衡。噪音问题一般包括轴齿轮发出嘎嘎响声、动力传动系统失衡/径向振摆、二阶运动学问题、启动震动、发动机扭矩波动、发动机空转震动等。不幸的是，各种替代设计方案会在提高一些噪声、振动和声振粗糙度性能的同时降低其它性能。对平衡不同动力传动系统噪声、振动和声振粗糙度要求的相关方法进行讨论。本演讲中亦对在如今的噪声、振动和声振粗糙度工程工艺中采用计算机辅助工程（CAE）的重要性进行说明。最后对优化全轮驱动（AWD）混合型汽车动力传动系统的噪声、振动和声振粗糙度的相关实例进行讨论。

Speaker Introduction:

1988: B.Sc. in Engineering Mechanics, Northwestern Polytechnical University

1991: M.Sc. in Acoustic Engineering, Noise & Vibration Control, Northwestern Polytechnical University

1991~1996: Lecturer, Northwestern Polytechnical University

2000: Ph.D. in Mechanical Engineering, North Carolina State University

2000 ~ 2010: Senior NVH Engineer, AAM

2010 ~ Current: Technical Engineering Leader, AAM

Dr. Zhaohui Sun has over 20 years of experience in noise, vibration and control. He has over 40 technical publications, and has given invited talks in many conferences and other events. He currently holds 5 US patents with 3 more pending. His current job and interests are in automotive drivetrain noise, vibration and harshness.

Abstract of Speech:

Today's emerging 4-wheel-drive and all-wheel-drive driveline architectures have presented new challenges to engineers in achieving low driveline system noise. In the meantime there's also a constant pressure from increasingly stringent noise level requirements. Driveline system NVH (noise, vibration & harshness) is not only a driving comfort issue, more importantly it is often associated with consumer's perception of vehicle quality and therefore significant cost.

This presentation discusses NVH engineering strategies and processes to achieve successful integration of drivetrain systems into vehicles. As any NVH problem being a source-path-responder system, different approaches and strategies are required to address each individual part of the issue, which are discussed with illustrations. The importance of system integration that involves teamwork of OEMs and suppliers are discussed with real examples. Another important aspect of NVH integration addresses balancing competing design imperatives regarding to NVH performances. The common noise issues may include axle gear whine, driveline imbalance/run-out, 2nd order kinematics, launch shudder, engine torque fluctuation,engine idle shake etc. Unfortunately various design alternatives may improve some NVH performance attributes while degrading others. Discussions are presented on methodologies in balancing these different driveline NVH requirements. The importance of using CAE in today's NVH engineering process is also illustrated throughout the presentation. An example of NVH optimization of a drivetrain system in an AWD cross-over vehicle is presented and discussed in the last.