Proposal of the pipe diagnosis method using in-plane bending vibration of cylindrical shell
Proposal of the pipe diagnosis method using in-plane bending vibration of cylindrical shell
复制标题
圆柱壳面内弯曲振动管道诊断方法的提出
DOI：
10.1299/transjsme.17-00522
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shigeki Shinoda
中科院分区：
文献类型：
--
作者：
S. Takata;Inoue Hirofumi;Shigeki Shinoda
本文采用均匀圆柱壳近似和面内弯曲模态对配水管的劣化诊断进行了研究。由于面内弯曲模式的本征频率与管道厚度成正比，因此预计面内弯曲模式在检测劣化方面具有高精度。首先，利用有限元方法，研究了平面弯曲模态的特性。结果表明，面内弯曲模态对管长和管端边界条件的依赖性很小，出现在音频频段，与管厚呈线性关系。此外，还导出了二维环近似下的计算公式.此外，本文还引入了平均壁厚和均匀圆柱壳近似来处理管道的损伤问题。利用减薄管的厚度，以前的研究，平均厚度和均匀圆柱壳近似的有效性进行了确认。另一方面，实际管道中存在阀门、消火栓等子结构，为了处理子结构与圆柱壳的耦合振动，采用半解析导纳法（SARM）进行特征值分析。在子结构无附着的情况下进行了试验研究。在实际管道系统上实验观察到了面内弯曲模态，其共振频率与理论值吻合较好。
In this paper, deterioration diagnosis for distribution main pipe was studied using the uniform cylindrical shell approximation and in-plane bending mode. The in-plane bending mode is expected to have high accuracy in detection of deterioration, because the eigen frecuency of the mode is proportional to pipe thickness. First, using the finite element method, the characteristics of in-plane bending mode are investigated. It is confirmed that in-plane bending mode has little small dependence on the pipe length and the boundary conditions at the pipe ends, it appears in the audio frequency bands, and it has linear dependence on the pipe thickness. In addition, formula with two dimensional ring approximation is derived. Moreover, the average thickness and the uniform-cylindrical shell approximation are introduced for deal with the deteriorated pipe. Using the thinning pipe thickness of previous study, validity of the average thickness and the uniform-cylindrical shell approximation were confirmed. On the other hand, actual pipeline has the sub-structure, for example, valve, hydrant, and so on. In order to deal with the coupled vibration between the cylindrical shell and the sub-structure, eigenvalue analysis are conducted using the Semi-Analytical Receptance Method (SARM). The experimental consideration were conducted in case of that the sub-structure non-attached case. The in-plane bending mode is observed experimentally on the actual pipe system and its resonant frequency shows good match with the theoretical values.
减少单次大剂量生物效应的机制。
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Gao Xin;Yamazaki Yuto;Tezuka Yuta;Omata Kei;Ono Yoshikiyo;Morimoto Ryo;Nakamura Yasuhiro;Satoh Fumitoshi;Sasano Hironobu;Michihiro Nakamura;平山亮一
通讯作者：
平山亮一