Reserch On Elecromagnetic Vibration Energy Harvest Of Bridge

The purpose of this paper is to solve the energy supply problem of wirelessmonitoring system for bridges. Based on the domestic and overseas present research formcrio-generator and bridge vibration, the vibration of bridge and vibration energy harvestare researched.First of all, several models of bridge vibration are introduced and their calculationways are analyzed. A moving constant force is chosen as the model of a moving car andthe bridge is considered to be a Bernoulli Euler beam bridge in this pqper. To make a morerealistic analysis of the structure, the viscous damping is considered in the formula，andthe methods for calculating bridge model are discussed in the frequency domain. Theformula of bridge vibration displacement and acceleration are worked out.Secondly, the calculation of the magnetic field and the edge values is discussed,based on the deep analysis of principle of electromagnetic vibration energy capture. Avibration energy acquisition model is established, and the induced electromotive force ofthe coil and the force between the permanent magnets are analyzed. The expressions of thepermanent magnet force and the induced electromotive force are obtained using magneticscalar potential and magnetic vector potential by the Laplace transform method. Theelectromagnetic damping model of the coil is obtained after analyzing the instantaneouspower of electromechanical coupling. Finally, a Simulink simulation model is establishedbased on the kinematic equations and the formulas are embedded into Simulink by Matlablanguage code. The coil simulation module, by which the output voltage of the load candirectly obtained, is established with the electrical simulation in the Simulink model. Themethod to calculate the output power of the electromagnetic vibration energy is given.