beam structures
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2022 ◽  
Vol 260 ◽  
pp. 106714
Author(s):  
Jaemin Jeon ◽  
Jaeyong Kim ◽  
Jong Jun Lee ◽  
Dongil Shin ◽  
Yoon Young Kim

2021 ◽  
pp. 107754632110399
Author(s):  
Chen Mao ◽  
Wai On Wong ◽  
Li Cheng

The localization of shaking forces acting on an operating machine is an important step to identify vibration and noise sources. The forced vibration response of a linearly vibrating structure is assumed to be linear. However, the energy distribution of a linearly vibrating structure contains “coupled terms” in the modal decomposition of the vibration energy density function. These coupled energy terms represent the cross-modal energy density associated with the exciting force of a dynamic structure under forced vibration. In this research, it is proved analytically that the high-order cross-modal energy densities of a linear dynamic structure are highly correlated to the location of the external exciting force. Using this finding, a new force localization index based on the high-order cross-modal energy densities of a dynamic structure is proposed and tested. Numerical tests on uniform and step beam structures under force excitation with different frequencies and locations have been carried out to test the effectiveness of the proposed force localization method. It is found that the proposed force localization method works well on vibrating beam structures. Experiments are carried out to verify the proposed force localization method.


2021 ◽  
Vol 27 (67) ◽  
pp. 1231-1236
Author(s):  
Masamichi SASATANI ◽  
Yu KURAHASHI ◽  
Hiro KAWAHARA ◽  
Katsuya SAKURAI ◽  
Junichiro ITO

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6796
Author(s):  
Andrzej Koszewnik ◽  
Kacper Lesniewski ◽  
Vikram Pakrashi

This paper investigates damage identification metrics and their performance using a cantilever beam with a piezoelectric harvester for Structural Health Monitoring. In order to do this, the vibrations of three different beam structures are monitored in a controlled manner via two piezoelectric energy harvesters (PEH) located in two different positions. One of the beams is an undamaged structure recognized as reference structure, while the other two are beam structures with simulated damage in form of drilling holes. Subsequently, five different damage identification metrics for detecting damage localization and extent are investigated in this paper. Overall, each computational model has been designed on the basis of the modified First Order Shear Theory (FOST), considering an MFC element consisting homogenized materials in the piezoelectric fiber layer. Frequency response functions are established and five damage metrics are assessed, three of which are relevant for damage localization and the other two for damage extent. Experiments carried out on the lab stand for damage structure with control damage by using a modal hammer allowed to verify numerical results and values of particular damage metrics. In the effect, it is expected that the proposed method will be relevant for a wide range of application sectors, as well as useful for the evolving composite industry.


2021 ◽  
pp. 621-628
Author(s):  
Hrishikesh G. Menon ◽  
Shammo Dutta ◽  
M. P. Hariprasad ◽  
Balakrishnan Shankar
Keyword(s):  

2021 ◽  
Vol 52 (10) ◽  
pp. 1064-1072
Author(s):  
M. Abdulkareem ◽  
A. Ganiyu ◽  
O. Nathaniel ◽  
I. Mallum ◽  
W. Dunu

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