Research On One Wave Piezoelectric Generation

In recent years, the demand for ocean wireless sensor nodes has been spreading speedily. The sensors nodes are usually designed to run on traditional battery. As the traditional battery are limited in capacity and have to be replaced or charged constantly, they are unable to meet the sensor nodes, which require the long life and stable batteries. People start to research the generation technology of environment energy. The ambient energy can be converted and stored up to provide power for the wireless sensor nodes. Solar energy or wind energy can be affected easily by weather. The wave energy converters can extract wave energy, and can not be affected by weather. The study of the wave energy harvesting technology is provided with general significance for the ocean wireless sensor nodes.A novel point-absorber wave energy piezoelectric generator has been designed with a damping plate. The mathematic model of the wave energy primary transducer was established. Simulation result shows that the relative displacement of0.075m is generated between the float and the drag board. A wave primary transducer was made and tested in the actual ocean wave environment. Test result shows the relative displacement of0.05m is generated between the float and the drag board in the prototype. So the feasibility of wave energy primary transducer theory model and program was verified. The simulation and test results can give us a reference to study the secondary transducer in the future.The theory of the secondary transducer has been studied. The simulation result shows that as excitation magnet and the cantilever magnet pole was parallel or perpendicular, magnet impacting periodicity can convert the wave motion with super low frequency into high frequency vibration of the piezoelectric cantilever, and has improved the vibration frequency of the piezoelectric cantilever.Finally, The linear piezoelectric generator experimental device has been designed and set up to simulate the wave energy primary transducer. The device has consisted of the control system of the step-motor and the slider-crank mechanism with the stroke of0.15m and the piezoelectric cantilever. The stroke of the single or array double excitation magnets is±75mm, frequency is0.5Hz, the test of impacting the piezoelectric cantilever shows that non-contact impacting can convert the wave motion with super low frequency into high-frequency vibration of the piezoelectric cantilever with configuration of the two magnet poles, The experimental results are consistent with the numerical results, and has verified the non-contact increased frequency conversion principle with the permanent magnet impact.