Structural Design And Experimental Study Of Micro Wave Energy Piezoelectric Power Generation Device

With the deepening of people’s demand for ocean exploration and ocean environment perception,various advanced ocean sensors are applied to ocean monitoring and exploration.Whether the ocean platform carrying these sensors can provide long-term stable and reliable low carbon energy source has become a key factor affecting the effective performance of the ocean monitoring system.This thesis introduces the current mainstream wave energy conversion power generation technology for small ocean sensor network nodes,and compares the characteristics of different technologies.It is found that traditional wave energy power generation devices have significant improvement space in structural design and size control.Guided by the idea of modular and lightweight design,applying piezoelectric power generation theory to guide the design of wave energy power generation devices,a miniature wave energy piezoelectric power generation device is proposed.This device not only ensures effective output voltage and output power,but also further reduces the size of the internal core device,providing the possibility for subsequent matching of marine wireless sensors.The micro wave energy piezoelectric power generation device is divided into two parts as a whole.The first part is a lantern type external shell,which provides buoyancy and protection for the device.The second part is the core of the internal piezoelectric power generation device,which is a combination of composite spring pendulum,permanent magnet excitation slider and piezoelectric cantilever beam array.After the prototype modeling is completed,the device is physically constructed,and the multi-physical field modeling analysis is carried out for the wave energy piezoelectric power capture device at the theoretical level,A mechanical-electrical coupling mathematical model of piezoelectric vibration system based on distributed parameters is established.Using the finite element analysis software,the output characteristics of the piezoelectric vibrator were analyzed,and the appropriate spacing between the magnetic block of the piezoelectric vibrator and the frequency-increasing permanent magnet is selected,which provides theoretical reference and support for the experimental setup.A periodic force excitation platform simulating the horizontal wave force excitation of sea waves in the real environment is established.The crank-slider mechanism driven by the motor is used to carry out periodic force excitation under different excitation conditions for the mounted wave energy piezoelectric power generation core device.The output characteristic data points of the system under multi-factor conditions are obtained and the time-domain graph of voltage is drawn.After extracting the peak-peak voltage of each stage,the three-dimensional scatter diagram under multi-factor superposition is drawn,When the device is equipped with four piezoelectric cantilever beams and each piezoelectric cantilever beam is in series mode,the system can reach the maximum output voltage peak-to-peak value of 6.954 V.The output characteristic curve of the device is further obtained.When the load resistance is 5.8 k Ω,the maximum output power of 4.39 m W is reached.This output characteristic provides the possibility for the later application of the device.Finally,through reviewing the full text,the thesis summarizes and prospects the overall thinking of the thesis and provides reference and suggestions for further research.