Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (1): 108-112.DOI: 10.12068/j.issn.1005-3026.2020.01.019

• Mechanical Engineering • Previous Articles     Next Articles

Influence of Adsorbed Micro-particles on Micro-suspended Bridge Sensor

MA Shu-jun, WANG Xiao-xiao   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2018-11-09 Revised:2018-11-09 Online:2020-01-15 Published:2020-02-01
  • Contact: MA Shu-jun
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Abstract: In order to further improve the detection accuracy of the sensor, a systematic theoretical investigation on the vibration characteristics of a nanomechanical sensor with a micro-particle adsorbed at various positions was carried out. Taking the typical micro-suspended bridge structure as the research object, considering the influence of the particle’s own mass, and using the perturbation theory, the expression of the exact mode shape and the corresponding resonant frequency of the loaded micro-suspended bridge was obtained. By this method, the relationship between the mass of the adsorbed particles and the dynamic characteristics of the micro-suspended bridge can be easily determined. The results show that the particle with larger mass has a great influence on the performance of the micro-suspended bridge. With the increase of the mass of the particle to be tested, the change of the mode shape of the micro-suspended bridge cannot be ignored. Finally, the accuracy of the result was verified by finite element simulation.

Key words: micro-particle, micro-suspended bridge, mass error, mode shape, perturbation method

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