Study On The Recovery System Of Track Vibration Energy Based On The Running Of Vehicle

With the development of railway transportation, rail-side equipments, such as wirelesssensor and RF coil are applied to the signaling systems in a huge amount. Due to the lackof power and high cost of power transmission, most of those rail-side equipments are takenbattery as their power supply. Such a method not only increases the cost of maintanence,but also triggers the possibility of pollution. This thesis intends to use the rail vibrationenergy as a new power supply to those equipments, which solves the supply issue and atthe same time save the additional cost for power supply in the field. This thesis studies amethod harvesting the vibration energy to use piezoelectric transducer as the powerresource of the rail-side equipments. The displacement response of the piezoelectrictransducer can be obtained through vehicle-track-piezoelectric coupling vibration model,and the relationship between the output and deformation of piezoelectric transducer arestudied by the model of drum transducer. The whole track vibration energy harvestingsystem is analytically modeled, numerically simulated, and experimentally proven in thisthesis to demonstrate the feasibility and the reliability of the theoretical mode.Track irregularity is carefully studied as the excitation source of track vibration. Thedifferences between the track spectrums of some countries are compared. Based onperiodogram method, the track random irregularity is simulated numerically. The resultdata serves as the input of the vehicle-track-piezoelectric coupling vibration model.The dynamic modeling problem of track vibration recovery system is studied. Basedon the vehicle-track coupling dynamics, vehicle-track-piezoelectric coupling vibrationmodel is established by an equivalent mass and spring system. Physical and mathematicalmodel are carefully studies. Morever, the numerical computing methods are also discussedin detail.Based on the first type piezoelectric equation, the model of drum vibrator isestablished to study the output characteristic of track vibration recovery system. The output voltage and power of the drum vibrater are simulated in different operation condition andload resistance.Based on experiment rig of track vibration energy recovery, the vibrator groups aremade for experiments. It contains16drum vibrators. The experiments are carried outcarefully in different condition and load resistance.The experimental results and theoreticalsimulation results have good consistency and the feasibility of track vibration energyrecovery and the reliability of the theoretical simulation are proved.The results of theoritical research show that drum transducer groups with2seriesconnections and200parallel connections can harvest the maximum power of about3.5Win full load condition at60km/h of train speed, and the out power of drum transducer grouphas the pulse characteristic. In the experiment research, the output voltage of drumtransducer group with2series connections and16parallel connections is60V~70V in theopen circuit, which is similar to the theoretical simulation results. A new method isproposed for the track vibration energy harvesting in this thesis, which is the theoreticalbasis for the harvest, recovery and recycle of the track vibration energy.