Identification of external force acting on a machine or a structure in the case of unknown excitation points
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 6
Abstract
Identification of any external forces acting on a machine or a structure is important for the diagnosis of potential failures or distress. One of the force identification methods is based on the frequency response function. This method is very useful but requires knowledge of the location of the acting force. In this study, an identification method is proposed for the case of unknown excitation points. In the method, the distributed external force is approximately expressed using the same number of unknown parameters as the sensors. The optimum identification condition is determined by two objective functions of the reconstruction accuracy of measured data and the spatial variation of the identified external force. The identification method proposed is checked using the actual measured data. A beam structure elastically supported at both ends is considered. The beam is excited by using an electromagnet. This excitation method is non-contact way so the magnitude of the external force cannot be directly measured by the load cell. The external force is identified using the measured data with an excitation frequency. It was shown that the identified external force was feasible using the proposed method.
Authors and Affiliations
Shozo Kawamura, Tomohiko Ise, Masami Matsubara
Keywords
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- EP ID EP394348
- DOI 10.9790/9622-0806021219.
- Views 108
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