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首页> 外文期刊>SAE International Journal of Vehicle Dynamics, Stability, and NVH >An Efficient Input Mobility Mapping Computational Method
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An Efficient Input Mobility Mapping Computational Method

机译：一个有效的输入移动映射计算方法

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摘要

The input mobility is a crucial structural parameter regarding vibro-acoustic design of industrial objects. Whatever the frequency range, the vibrational power input into a structure - and consequently the average structural-acoustic response - is governed by the input mobility. When packaging structure-borne noise sources, the knowledge of the input mobility at the source connection points is mandatory for noise control. The input mobility is classically computed at the required points as a specific Frequency Response Function (FRF). During an industrial design process, the choice of connection points requires an a priori knowledge of the input mobility at every possible location of the studied structure-borne source, i.e. a mapping of the input mobility. The classical FRF computation at every Degree Of Freedom (DOF) of the considered structure would lead to consider millions of load cases which is beyond current computational limits. This paper presents how to efficiently compute the full map of band-averaged input mobility over a Finite Elements mesh. The proposed method is based upon a modal decomposition of the structural response and analytical frequency integration; consequently, it only requires the modal basis as it is currently computed. The frequency band average allows optimizing the storage size. Since the input mobility is a real quantity, associated to each DOF of a structure, modal display tools can be used without modification. Thus, a meaningful map is provided, allowing efficient structural dynamics analysis over a broad frequency range.
机译：输入流动性是一个至关重要的结构关于纵槽设计参数工业对象。——振动功率输入到一个结构因此平均structural-acoustic反应是由输入流动性。当包装结构传递噪声来源,知识输入流动性的来源噪声控制的连接点是强制性的。输入流动性是经典计算需要点作为一个特定的频率响应函数(降维)。过程,连接点的选择要求一个先验的知识输入流动性每一个可能的位置进行了研究结构传递源,即的映射输入流动性。每一个自由度(自由度)的考虑结构会导致考虑数以百万计的负载情况下,超出当前的计算限制。计算的完整地图band-averaged输入流动在一个有限的网格元素。该方法是基于模态分解的结构响应和分析频率集成;它只需要模态基础上目前计算。允许优化存储大小。输入流动性是一个真正的数量相关每个自由度的结构模态工具可以显示没有修改。提供地图,允许高效的结构动力学分析在一个广泛的频率范围。

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