2002 Fiscal Year Final Research Report Summary
Design of robust autotuning control system based on model validation
| Project/Area Number |
12650448
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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 |
Control engineering
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
SAEKI Masami Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60144325)
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| Co-Investigator(Kenkyū-buntansha) |
WADA Nobutaka Graduate School of Engineering, Assistant Professor, 大学院・工学研究科, 助手 (50335709)
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| Project Period (FY) |
2000 – 2002
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| Keywords | unfalsified control / critical gain / critical frequency / antiwindup control / PID control / parameter space design / motion control / frequency estimator |
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| Research Abstract |
1) We propose a data-driven design method of PID controllers for a mixed sensitivity control problem based on unfalsified control concept. This method does not require constructing a mathematical model but only requires the input and output response of the plant of a feedback system excited by sinusoidal reference inputs for many frequencies. A falsified region which satisfies a necessary condition on the PID gains is drawn on the parameter plane for each frequency.
2) We propose two adaptive identification methods of the critical point, and examine the property by water level-control experiments. The critical gain is identified by using the self-oscillation of the feedback system composed of the plant, a saturation function and a tuning gain where the gain is decreased gradually based the saturation information. This method can be also applied to multi-input multi-output plants. Further, inorder to identify the critical frequency, a new tuning rule which use an adaptive frequency estimator is proposed. These two methods works well for computer simulation, but we found by experiments that the convergence speed is much slower than the simulation result for practical use.
3) We examine nonlinear control problems such as antiwindup control for input saturation plant, backward driving control problem of articulated vehicles, and hovering control of twin rotor helicopter model in order to obtain a fundamental knowledge to such a complicated systems and to study such systems by unfalsified control concept in the future. The usefulness is examined by simulation and experiments.
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