Research On Vibration Energy Acquisition Technology Of Buckling T-shaped Piezoelectric Beam

With the continuous expansion of marine engineering applications,how to provide energy for COSCO Marine also uses engineering has become an emerging topic.It is the efforts of researchers from various countries to find and develop new energy to solve the energy problems in marine engineering.Vibration occurs all the time in the marine environment,ranging from various types of marine engineering machinery,to various components,and even human life.Vibration generates energy.In order to collect vibration energy,a new type of green pollution-free energy,scholars A vibration energy harvester was developed to convert it into electrical energy as a substitute for chemical batteries^[12]for use in breakwaters and small and medium-sized electronic components on islands and reefs.The static analysis of the buckling T-shaped beam using finite element software found that the voltage value measured by the buckling T-shaped piezoelectric beam increased linearly with the length of the substrate;as the width of the substrate increased,the measured The smaller the voltage value.In the dynamic analysis,the peak value of the voltage-frequency curve of the fixed-simple-supported beam is smaller than that of the single-sided fixed-support,but the acquisition frequency width is larger.Compared with the cantilever beam,the T-beam has a larger output voltage value and a larger acquisition frequency width,indicating that the T-beam has better vibration energy harvesting performance than the traditional cantilever.Through the harmonic response analysis of Ansys software,the change trend of the voltage value with the excitation frequency is studied.It can be found that the greater the length of the substrate of the T-beam parallel to the Y direction,the greater the peak value of the T-beam output voltage-frequency curve,and the parallel The greater the length of the substrate in the X direction,the smaller the peak value of the output voltage.The peak value of the output voltage at the second-order natural frequency increases with the length of the substrate parallel to the X direction;as the substrate parallel to the Y direction As the width increases,the peak value of the output voltage value decreases,and the effect of the substrate width parallel to the X direction is just the opposite;the output voltage value increases with the increase of the additional weight;the external axial force exerts a voltage output value The impact is positively correlated.Through the transient analysis,the trend of the voltage value with time is studied.The effect of different model sizes on the extreme value of the voltage output value is basically the same as the result obtained by the harmonic response analysis.The length of the substrate parallel to the Y direction is 300mm,the length of the substrate parallel to the X direction is100mm,and the first-second natural frequency ratio of the T-beam when the substrate 1.2width is 12mm is exactly 2,the voltage output obtained in the transient analysis The extreme value is significantly larger than other sizes.It shows that when the internal resonance ratio is 1:2,the frequency width and voltage output value can be effectively increased.Comparing aerodynamic energy collection simulation studies,it can be found that the effect of different model sizes and external axial forces on the output voltage value change trend is the same as that obtained in Ansys.Compared with the effect of the model size on the output voltage value under the harmonic load,it is found that under the aerodynamic load,the effect of the substrate width parallel to the X direction on the output voltage value is opposite,and the harmonic load is parallel to the Y direction.The output voltage value when the substrate length is 300mm is greater than 280mm.The harmonic voltage and the aerodynamic load have the same effect on the output voltage under other conditions.