Eliminating the Influence of Additional Sensor Mass on Structural Natural Frequency in the Modal Experiment

Publication Type:
Conference Proceeding
Vibration Engineering for a Sustainable Future Experiments, Materials and Signal Processing, 2021, 2, pp. 73-79
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A contact sensor affects natural frequency of lightweight structures greatly as it adds extra mass. Although there are some measures such as light mass sensor and complex theory to test structural modes, a simple and effective experimental method is present to obtain accurate modal parameters in this article. In the method, mode shape nodes of the original structure are firstly acquired by experiment and then the modal experiment is conducted by fixing the contact sensor near the mode nodes. The experiments are implemented for a cantilever beam and a suspended beam to verify this method. Results of the first three order frequencies indicate that the accurate modal data can be obtained by using the present method as compared to theoretical results.
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