电磁式振动能量收集器的寿命预测方法研究OA

A Comsol stress analysis combined with S-N curve was developed to evaluate the fatigue life of an electromagnetic vibration energy harvester.Firstly,the open circuit voltage,optimal matching resistance,and coil resistance at the resonant frequency were experimentally measured to establish a quantitative relationship between vibration acceleration and the maximum force acting on the spring.Then,a model was established in Comsol based on the structural dimensions of the harvester,and the S-N curve of the corresponding material was selected.Finally,the stress distribution characteristics of the spring at different accelerations were combined to obtain the number of spring failure cycles corresponding to each acceleration.To overcome the problems of insignificant spring fatigue at low accelerations and long experimental cycles,aging experiments were conducted in high acceleration environments of 2.2g and 2.5g(g is the acceleration due to gravity).Based on the proposed method,a resonant frequency of 30 Hz was constructed The aging test prototype of the electromagnetic energy harvester was tested,and the experimental results were consistent with the simulation predictions,verifying the feasibility and accuracy of the method.