1998 Fiscal Year Final Research Report Summary
Design and Control Experiments of Piezoelectric Hydraulic Actuators
| Project/Area Number |
09650270
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | University of Tokushima |
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Principal Investigator |
KONISHI Katsunobu University of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (20035653)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Kyoji University of Tokushima, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80035641)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Piezoelectric Element / Hydraulic Pump / Hydraulic Resonancy / Hydraulic Actuator / Brake-by-Wire System / Disk Brake / Disturbance Observer |
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| Research Abstract |
In this research, we discussed mathematical models of the piezoelectric pump and its application to the automoble brake system. The piezoelectric pump consists of a multilayered piezoelectric element, a diaphragm, pumping valves, resonant pipes and accumulatos, and the maximum pumpimg power of 62W was obtained in the previous experiments by using the piezoelectric element of 22mm diameter and 55.5mm length. A detailed mathematical model of the pump is derived here by considering the compressibility of the working liquid, nonlinear characteristics of piezoelectric element, the time delay of pumping valves action and so on.
The validity of the model was illustrated by comparing the experimental data and the simulation results.
Using the mothematical model of the piezoelectric pump, a brake system for automoble disk brake was also simulated in this research. The brake system consists of a piezoelectric pump as a power source, calipers and its piston to generate brake force, and a three position solenoid valve to change the sitsuation of brake. It was shown that 15mm/sec of piston speed and 20kN of piston force were obtained by using the piezoelectric element of 33mm diameter and 55.5mm length. The control strategy of the piston force was also constructed in this research by using the disturbance observer where control input was the driving voltage of the piezoelrctric pump.
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