Study On The Recovery Theory Of Speed Bump Vibration Energy Based On The Running Of Vehicle

Speed bumps are always set in traffic areas for safety. While the vehicle travels through the speed bump, vibration energy can be generated by speed bump vibration. Most of the energy is absorbed by speed bump and roadbed. It is feasible that the mechanical energy is converted to electrical energy. Recycling has strong feasibility. Machinery energy recovery from speed bump based on piezoelectric transducer consistent with sustainable development and the concept of low-carbon. It is an effective way of energy recovery and has great research value. This research is focused on energy harvesting from speed bump vibration in order to provide power for small electronic equipment on both sides of the road. The displacement response of the piezoelectric transducer can be obtained through vehicle-speed bump-piezoelectric coupling vibration model, and the relationship between the output and deformation of piezoelectric transducer are studied by the model of cymbal transducer. The whole speed bump vibration energy harvesting system is analytically modeled, numerically simulated, and experimentally proven in this thesis to demonstrate the feasibility and the reliability of the theoretical mode.Road irregularity and speed bump itself are carefully studied as the excitation source of speed bump vibration. The differences between the road spectrums in some methods are compared. Based on harmonic superposition method, the road random irregularity is simulated numerically. The result data serves as the input of the vehicle-speed bump-piezoelectric coupling vibration model.The dynamic modeling problem of speed bump vibration recovery system is studied.Based on the vehicle-road coupling dynamics, vehicle-speed bump-piezoelectric coupling vibration model is established by an equivalent mass and spring system. Physical and mathematical model are carefully studies. Morever, the numerical computing methods are also discussed in detail.Based on the first type and the forth type piezoelectric equations, the model of cymbal vibrator is established to study the output characteristic of speed bump vibration recovery system. The output voltage and power of the cymbal vibrater are simulated in different load resistances.Based on experiment rig of speed bump vibration energy recovery, the vibrator groups are made for experiments. It contains 5 cymbal vibrators. The experiments are carried out carefully in different load resistances. The experimental results and theoretical simulation results have good consistency and the feasibility of speed bump vibration energy recovery and the reliability of the theoretical simulation are proved.The theoretical results show that, the displacement and load of cymbal piezoelectric vibrator vibration have obvious characteristics of pulse. Speed bump vibration energy recovery test device and cymbal piezoelectric vibrator are designed. The simulation and experiment results show that peak open-circuit voltage of piezoelectric transducer group is about 150V-170 V at the velocity of 2 m/s, and it can generate 229 mW in the optimal load.The whole vibration energy harvesting system is analytically modeled, numerically simulated, and experimentally realized to demonstrate the feasibility and the reliability of the theoretical model. This study explored the new way of energy recovery with speed bump, and laid the theoretical foundation for the vibration energy recovery, storage and reuse.