Study On The Recovery And Storage Methods Of Track Vibration Energy Based On The Running Of Vehicle

With rapid social and economic development,Rail transit has increasingly become an essential commuter way in people’s daily life.Wireless monitoring network which consists of widely deployed trackside wireless sensor node is an important means to ensure the safe operation of the railway transit.The way to supply wireless sensor equipment with power by collecting railway vibration energy is studied,which can reduce or even replace the traditional energy supply methods,such as battery and maintenance,save costs,reduce pollution and efficiently maintain the operation of the trackside equipment in real time.The piezoelectricity type energy recovery interface circuit is studied,the main contents and achievements are as follows:(1)This thesis intends to use the rail vibration energy as a new power supply to rail-side equipment.analyzed the energy conversion process of piezoelectric materials,calculation methods for output power of cantilever beam piezoelectric oscillator,and drum-shaped piezoelectric oscillator are analyzed with basis theory of first piezoelectric equation,and the relationship between the output and deformation.Electric-mechanical coupling model with drum-shaped piezoelectric vibrator is built as a conversion devices of vibration energy and electric power.The displacement response of the piezoelectric transducer can be obtained through vehicle-track-piezoelectric coupling vibration model.(2)The recovery power of Standard,Series-SSHI and SECE interface circuits is derived theoretically,the relationship between recovery power and load is analyzed.An optimized DSCE interface circuits is designed,the control process of the DSCE interface circuit is clarified in detail,the theoretical recovery power of this circuit is derived,relationship between the control mode and output power is analyzed.The theoretical output power of several interface circuit compared,results showed DSCE interface circuit’s output power is less than Series-SSHI circuit’s maximum output power in the optimal load,but the DSCE circuit’s output power is not affected by load which has a better adaptability to load.(3)Piezoelectric oscillator model is established by Simulink,as well as Standard,Series-SSHI,SECE and DSCE circuits to simulate the control processes and working modes.The simulation interface circuit is obtained under the piezoelectric vibrator output voltage,output current and load voltage.Completed the output characteristics theory analysis of interface circuits.(4)The experimental platform is established,an extreme displacement detection circuit is designed as a secondary circuit which provides interface circuit with control signals.The harvesting power of Standard,Series-SSHI,SECE and DSCE interface circuits under different load and fixed motivation are measured.The relationship between circuit and load are analyzed and compared.Experimental results agree well with theoretical analysis.