Development of the estimation method of energy flow path inside the 3-dimensional structure using surface velocity data and finite element method

利用表面速度数据和有限元方法开发 3 维结构内部能量流路径估计方法

• 批准号: 10450034
• 负责人: UEHA Sadayuki
• 金额: $ 2.5万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450034/
• 关键词: structural intensity; Inverse problem; finite element method; noise control; Laser Doppler vibrometer; noise problem; vibration measurement; noise source identification

Many studies about structural intensity (SI) measurement, which is useful to know transmission paths of the vibration energy in a body, have been reported until now. Most of the works, however, have been done only for thin bodies, such as beams or plates because of the difficulty in measuring interior vibration distribution in thick structures. In this research, we propose a new SI measurement method applicable to thick bodies. The entire vibration distribution in the structure is calculated by dynamic analysis of finite element method (FEM) from the partial surface vibration data if the density, the sound velocity, sizes of a body under study and the locations of excitation and absorption are given apriori. The entire SI distribution can be estimated using the results. Based on this method, we have successfully carried several SI measurements for thick vibrating bodies. The merits of this method are as follows: (1) Only surface vibration data of the structure is needed to estimate the entire SI distribution. (2) It is applicable for arbitrary 3-D structures if the conditions mentioned above are satisfied apriori. In the research, the influence of the measurement error and the required number of the measurement data are also investigated.

迄今为止，已经报道了许多关于结构强度（SI）测量的研究，这有助于了解体内振动能量的传输路径。然而，大多数工作仅针对薄体（例如梁或板）进行，因为测量厚结构中的内部振动分布很困难。在这项研究中，我们提出了一种适用于厚体的新 SI 测量方法。如果先验地给出了所研究物体的密度、声速、尺寸以及激励和吸收的位置，则可以通过有限元方法（FEM）对部分表面振动数据进行动态分析来计算结构中的整个振动分布。可以使用结果来估计整个 SI 分布。基于该方法，我们成功地进行了多次厚振动体的SI测量。该方法的优点如下：（1）仅需要结构的表面振动数据即可估计整个SI分布。 (2) 如果先验满足上述条件，则它适用于任意 3 维结构。研究中还考察了测量误差和所需测量数据数量的影响。