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Non-contacting test methodology studies of automotive body components have become a very useful, high resolution and sensitive test technique to engineering personnel. Continuous wave laser holometry, computer aided holometry (CAH), pulsed laser holometry and a scanning laser system were used to image vibration patterns. These methods were selected because of improved data turn-around time in the test development process while having no mass-loading effects on the sheet metal panels. An analysis of the vehicle body structure was conducted to improve the interior body structure sound quality and to reduce road noise presence. An interrogation of the interior noise spectrum identified critical frequencies affecting vehicle NVH. This paper addresses the results of using the aforementioned non-contacting test methods to reduce panel responses by developing an optimum rib section and pattern, and the addition of adhered stiffening materials.

Body structure design and development is becoming more and more critical for noise, vibration and harshness (NVH) vehicle performance. Many body structure design alternatives are studied analytically and in hardware during a vehicle program. Because of design and fabrication time, body structure hardware development can be very expensive and extremely time consuming. Consequently, the use of experimental design techniques for vehicle NVH development are becoming more popular to bring quality products to the market faster. This paper demonstrates how an experimental approach was used to develop the body structure. Initially, a hardware experiment was used to assess the effects of four parts groups for Body Chassis NVH. Then, to further study the major parts groups, a computational experiment was performed. The result of these two experiments (hardware and computational) was used to recommend design concepts which reduced interior noise levels and improved body chassis NVH.