|Title:||Cross-modal vibration energy method for dynamic force identification|
Hong Kong Polytechnic University -- Dissertations
|Department:||Department of Mechanical Engineering|
|Pages:||xii, 83 leaves : ill. ; 30 cm.|
|Abstract:||Force identification is important in locating the vibration and noise sources of an operating machine. The forced vibration response of linearly vibrating structure is linear by definition. However, the energy distribution of linearly vibrating structures contains "coupled terms" in the modal decomposition of the response function. These coupled terms represent the cross-modal energy terms of a dynamic structure under forced vibration. In this research, it is proved analytically that certain cross-modal energy terms are highly correlated to the location of the external exciting force. Based on this finding, a new force localization method based on the cross-modal energy terms is developed, and a new index based on the suitably selected cross-modal energy terms to locate the force is developed. Numerical tests on 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 even when random noise is taken into consideration. It is shown that the new method can identify the exciting force well. Experiments are done for verification of the proposed force localization method.|
|Rights:||All rights reserved|
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item: