Modeling, testing and optimization of the vibroacoustic performance of laminated steels and other damping treatments used in automotive components

减少乘用车的内部噪音和振动是性能、音质和客户满意度的主要要求。采用粘弹性材料的被动阻尼技术通常用于控制几种主要汽车部件的振动。目前，实际的阻尼处理及其性质因车辆平台和整体OEM实践而异。需要开发一种强大的策略来选择、定位和优化更宽频率和温度下的阻尼处理。这个项目是朝着这个方向迈出的第一步。它集中于约束和自由层处理，重点是层压钢。优化和设计这种材料需要对阻尼材料的机理及其与底层振动结构的相互作用进行详细和基础的研究。这是这个项目的主要目标。它旨在通过建模和测试来识别、理解和量化这些阻尼处理。最终结果是：(i)开发准确可靠的数值模型，能够预测含有粘弹性材料的结构的频率响应，并在此基础上，（ii）在设计阶段评估可能的阻尼解决方案的性能，以及（iii）开发成本和重量最低的新阻尼材料和策略，同时保持组件的刚度和可制造性。目前的研究项目正在通过一些数值和实验研究来解决这些具有挑战性的问题。拟议的工作将与加拿大通用汽车公司的工程师和科学家密切合作。他们将提供重要的互补专业知识（聚合物材料，三明治层压，粘合等），并确保拟议的研究符合最高和最具区别性的质量标准，易用性，并满足汽车行业的实际需求。此外，它将确保已开发的技术迅速转让给加拿大通用汽车公司。

Reduction of interior noise and vibration in passenger vehicles is a major requirement for performance, sound quality and customer satisfaction. Passive damping technology using viscoelastic materials is classically used to control the vibration of several major automotive components. Currently, the actual damping treatment and its nature vary with vehicle platforms and overall OEM practices. There is a need to develop a robust strategy to select, locate and optimize the damping treatment over broader frequencies and temperatures.  This project is a first step into this direction. It concentrates on constrained and free layer treatments with an emphasis on laminated steels. Optimizing and designing such materials requires a detailed and fundamental investigation of the mechanisms of damping materials and their interaction with the underlying vibrating structures. This is the main objective of this project. It is aimed at identifying, understanding and quantifying, through modeling and testing, these damping treatments. The end results are (i) development of accurate and reliable numerical models capable of predicting the frequency response of structures containing viscoelastic materials and on this basis, (ii) assessment at the design stage of the performance of possible damping solutions, and (iii) development of new damping materials and strategies with the lowest cost and weight while maintaining components stiffness and manufacturability. The present research program is tackling these challenging issues through several numerical and experimental studies. The proposed work will be performed with close collaboration with GM of Canada engineers and scientists. They will provide important complementary expertise (polymeric materials, sandwich lamination, adhesion, etc.) and ensure that the proposed research meets the highest and most discriminating standards for quality, ease of use, and answers to the real needs of the automotive industry. Moreover, it will ensure the rapid transfer of the developed technology to GM of Canada.