School of Electronics and Information, Yangtze University, Jingzhou 434023, China.
School of Mechanical Engineering, Yangtze University, Jingzhou 434023, China.
Sensors (Basel). 2022 Jul 10;22(14):5167. doi: 10.3390/s22145167.
Impact force refers to a transient phenomenon with a very short-acting time, but a large impulse. Therefore, the detection of impact vibration is critical for the reliability, stability, and overall life of mechanical parts. Accordingly, this paper proposes a method to indirectly characterize the impact force by using an impact stress wave. The LS-DYNA software is utilized to establish the model of a ball impacting the steel plate, and the impact force of the ball and the impact response of the detection point are obtained through explicit dynamic finite element analysis. In addition, on this basis, a correspondence between the impact force and the impact response is established, and finally, an experimental platform for impact force detection is built for experimental testing. The results obtained by the finite element method are in good agreement with the experimental measurement results, and it can be inferred that the detected piezoelectric signal can be used to characterize the impact force. The method proposed herein can guide the impact resistance design and safety assessment of structures in actual engineering applications.
冲击力是一种作用时间极短但冲量很大的瞬态现象。因此，检测冲击振动对于机械零件的可靠性、稳定性和整体寿命至关重要。为此，本文提出了一种通过冲击应力波间接表征冲击力的方法。利用 LS-DYNA 软件建立了球撞击钢板的模型，通过显式动力有限元分析得到了球的冲击力和检测点的冲击响应。在此基础上，建立了冲击力与冲击响应之间的对应关系，最后建立了冲击力图测试实验平台进行实验验证。有限元方法的结果与实验测量结果吻合较好，推断检测到的压电信号可以用来描述冲击力。本文提出的方法可以为实际工程应用中的结构抗冲击设计和安全评估提供指导。
