| Summary: | 碩士 === 國立臺灣科技大學 === 自動化及控制研究所 === 94 === In the hydraulic servo control applications, hydraulic valve-controlled servo systems are used mostly because of the high response characteristics; but which energy efficiency is low. Hydraulic pump-controlled servo systems have high energy efficiency, however, the conventional pump-controlled systems, which are altered by displacement via variable displacement pumps, have lower response. The objective of this research is to investigate the servo performance of the high response electro-hydraulic pump-controlled systems driven by an AC servo motor with variable rotational speed (HPC-VRS). Thus, the new hydraulic pump-controlled system with an AC servo motor and a constant displacement axial piston pump is investigated for force control of hydraulic servo machines.
In this study, two different kinds of control algorithm are proposed to realize the force control response of HPC-VRS. First, a fuzzy sliding-mode controller (FSMC) which can reduce the fuzzy rule numbers is applied. Then an adaptive fuzzy sliding-mode controller (AFSMC) is developed. The AFSMC can not only simplify the fuzzy rule base but also estimate the equivalent control force and online self-tune the rule base through the adaptive strategy.
The experimental results show that the performance of AFSMC is better than FSMC in the HPC-VRS. And more experiments for force control in the HPC-VRS controlled by AFSMC are implemented in different stroke and loading conditions. The developed HPC-VRS controlled by AFSMC realize the outstanding performance of high response and high efficiency.
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