Nonlinear Vibration in Vehicular Structures

利用数值模拟来量化道路车辆、飞机和船舶等复杂机械结构的噪声和振动性能，这是一种日益普遍的做法。然而，在用于预测噪声和振动响应的数学模型中，结构不同部件固有的非线性通常被排除在外。到目前为止，这些复杂结构的结构模型往往被过度简化，部分原因是考虑到可接受的模拟时间，但也缺乏作为操纵和优化机械结构中非线性共振响应特征的系统手段。对车辆的非线性共振响应进行建模的能力将改变目前使用全尺寸原型来评估噪声和振动性能的做法，从而显著降低下一代汽车的开发成本。研究将探索创新的方法(通过非线性动力学、计算力学和优化的组合)，以可接受的计算成本纳入车辆结构的噪声和振动响应的非线性影响。

It is an increasingly common practice to employ numerical simulations to quantify the noise and vibration performance of complex mechanical structures, such as road vehicles, aircraft and ships. However, nonlinearities inherent in the different components of a structure are often excluded from the mathematical models used to predict noise and vibration response. Hitherto, structural models of these complex structures were often overly simplified, partly to allow for acceptable simulation times but also as a systematic means for manipulating and optimising features of nonlinear resonant response in mechanical structures is still lacking. The ability to model the nonlinear resonant response of a vehicle will lead to a paradigm shift in the current practice of using full-scale prototype to assess noise and vibration performance, leading to a significant reduction in development cost of next generation vehicles.The research will explore innovative methods (through a combination of nonlinear dynamics, computational mechanics and optimisation) to incorporate the effects of nonlinearity in noise and vibration response of vehicular structures, at an acceptable computational cost.