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<p>Electromechanical actuators (EMAs) are extensively employed in small aircraft. However, inherent structural nonlinearities such as freeplay, arising from limitations in production and manufacturing processes, can adversely affect the dynamic behavior of fin-actuator systems. This paper studies the correlation between modal frequencies and freeplay through the developed simulation model of the fin-actuator, and the modal frequencies are obtained by the impact hammer test. Both freeplay and friction effects are incorporated into the model to evaluate the influence of freeplay gap length and external loads on the frequency response function (FRF). Comparative analyses reveal that, under consistent impact load, significant differences exist in the vibration frequency responses for a fin with/without an external weight load. These results suggest a positive correlation between the frequency discrepancy and the magnitude of the freeplay, offering a reference for the detection of freeplay in fin-actuator systems.</p>

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Nonlinear modeling and vibration modal analysis of Fin-actuator system with freeplay

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Yanshen Ren,
  • Zhiwei Xu,
  • Dejia Tang,
  • Ruoyu Liu,
  • Li Fang,
  • Wei Wang

摘要

Electromechanical actuators (EMAs) are extensively employed in small aircraft. However, inherent structural nonlinearities such as freeplay, arising from limitations in production and manufacturing processes, can adversely affect the dynamic behavior of fin-actuator systems. This paper studies the correlation between modal frequencies and freeplay through the developed simulation model of the fin-actuator, and the modal frequencies are obtained by the impact hammer test. Both freeplay and friction effects are incorporated into the model to evaluate the influence of freeplay gap length and external loads on the frequency response function (FRF). Comparative analyses reveal that, under consistent impact load, significant differences exist in the vibration frequency responses for a fin with/without an external weight load. These results suggest a positive correlation between the frequency discrepancy and the magnitude of the freeplay, offering a reference for the detection of freeplay in fin-actuator systems.