【摘要】 非负声强通过提取振动结构表面仅含正向辐射能量贡献的声强分布场，可有效规避传统声强场中近场区域可能出现的声能量抵消效应，直观表征结构表面对远场声辐射的贡献。结合非负声强在识别振动结构表面声辐射贡献方面的优势，选取预定义表面上非负声强积分作为目标函数，提出了一种针对声振耦合系统的双材料拓扑优化方法。该方法根据结构的声辐射模式，在结构表面预定义了一个用于目标函数评估的局部区域。同时，考虑了声场与结构之间双向耦合的影响，从而实现了强耦合系统表面特定声辐射模式的设计。数值模拟表明，以预定义区域上的非负声强积分为目标函数的双材料拓扑优化可以有效改变耦合系统的声辐射模式，减少强辐射区域对远场声辐射的贡献，同时降低结构辐射声功率。更多还原

【Abstract】 The non-negative intensity(NNI) can effectively avoid the acoustic energy cancellation effect that may occur in the near-field region of the traditional sound intensity field. This is realized by extracting the sound intensity distribution field on the vibration structure surface that only contains the positive radiation energy contribution. The NNI can directly and intuitively represent the contribution of the structure surface to the far-field acoustic radiation. Combining the advantages of the NNI in identifying the acoustic radiation contribution of the vibration structure surface, a bi-material topology optimization method for vibro-acoustic coupling systems was proposed, in which the integral of NNI on the predefined surface was selected as the objective function. In the method, a local area was predefined for the objective function evaluation on the structure surface based on the acoustic radiation mode of the structure. Considering the bidirectional coupling between the acoustic field and the structure, the design of the acoustic radiation mode on the surface of the coupled system was carried out. The numerical simulation shows that the bi-material topology optimization with the integral of non-negative intensity on the predefined area as the objective function can effectively change the acoustic radiation mode of the coupling system, reduce the contribution of the strong radiation area to the far-field acoustic radiation, and simultaneously reduce the acoustic radiation power of the structure.更多还原