A novel piezohydraulic vibration isolator consisting of a hydraulic cylinder and piezodiscs was presented for low-frequency and wide-bandwidth vibration energy harvesting. The analytical model for performance evaluation was established first based on the theory of vibration analysis and simulated to obtain the influence of backpressure and proof mass on equivalent bulk modulus and stiffness of fluid, and optimal frequency and generated voltage of the piezohydraulic vibration isolator. And then, a prototype was fabricated and tested. The research results show that, under other parameters given, the energy generation performance of a piezohydraulic vibration isolator can be tuned with changing backpressure and proof mass. And there are a series of optimal parameter combinations of backpressure and proof mass for a piezohydraulic vibration isolator to achieve the same optimal frequency and almost the same voltage. The minimal optimal tested frequency of 13 Hz and the relative voltage of 81.6 V were obtained at 0.2 MPa and 10 kg. For parameter combinations (0.4 MPa/10 kg, 0.4 MPa/5 kg and 0.8 MPa/5 kg), the optimal frequency and generated voltage are 19 Hz/98 V, 27 Hz/96.8 V and 39 Hz/94.8 V, respectively. Correspondingly, the bandwidths to generate voltage of 40 V are 28/35/30 Hz, respectively.
To improve energy generating capability and reliability/strength, a novel piezohydraulic generator for low frequency vibration was presented. The piezohydraulic generator consisted mainly of a double-rod hydraulic cylinder for conversion of vibration energy to fluid energy and piezodiscs for conversion of the fluidic energy to electric energy. A vibration function and energy-conversion model of the generator was established based on theory of vibration analysis and simulated to obtain the influence of backpressure on energy generation as well as optimal frequency. The analysis results show that both the energy generation and optimal frequency increases with the rising of backpressure under given other parameters. A piezohydraulic harvester was fabricated and tested at different backpressure. Both the optimal frequency and the relative peak voltage/power increase with the rising of backpressure. At 0.2 MPa and 0.8 MPa, the peak-voltage and the relative optimal-frequency are 9 V/11 Hz and 112 V/17.5 Hz respectively. Similarly, the peak-power and the relative optimal-frequency are 0.58 mW/13 Hz and 11.63 mW/17 Hz respectively. The research results indicate that a piezohydraulic generator can be used to harvest energy from a low-frequency and high-level vibration source.
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