| Project/Area Number |
12450058
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機械工作・生産工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KAKINO Yoshiaki Kyoto University, Department of Precision Engineering, Professor, 工学研究科, 教授 (00026204)
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| Co-Investigator(Kenkyū-buntansha) |
TAKESHITA Torao Mitsubishi Electric Corporation Nagoya Works, Numerical Control System Department, Councilor, 名古屋製作所・NCシステム部, 参事(研究職)
NAKAMURA Shinya NSK Ltd., Precision Machinery and Parts Technology Center, Manager, 精密技術開発センタ, 部長(研究職)
MATSUBARA Atsushi Kyoto University, Department of Precision Engineering, Associate professor, 工学研究科, 助教授 (80243054)
竹下 虎男 三菱電機(株), 名古屋製作所・NCシステム部, 参事(研究職)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 2001: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2000: ¥7,300,000 (Direct Cost: ¥7,300,000)
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| Keywords | Servo control system / Damping control / Pneumatic control system / CNC machine tools / linear guideway / 直道ガイド |
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| Research Abstract |
1. Development of the contact-type Intelligent Guideway on a test stand of a two-axis feed drive The Intelligent Guideway is a roller guideway with brake shoes installed on the guide rail. By controlling the braking force, one can dynamically control the friction on the guideway. We developed a test stand of a two-axis feed drive with the proposed Intelligent Guideway to evaluate its effectiveness. A pneumatic actuator with using a high-speed electronic valve is used to control brakes. Particularly in latest high-speed, high-acceleration NC machine tools, the structural vibration is a critical issue that has a significant effect on the closed-loop stability and contouring accuracies. By employing the Intelligent Guideway in feed drive systems, the damping characteristics of such structural vibration can be improved. Experimental studies on the test stand validated the dynamic damping given by the Intelligent Guideway to low-frequency structural vibrations, and the significant improvement in the system's closed-loop response.
2. Comparison studies of damping control schemes for feed drive systems In order to address vibration issues in feed drive systems such as the machine's structural vibration or the longitudinal vibration of the ball screw, various damping control schemes have been proposed. In particular, the effectiveness of the relative velocity feedback control scheme was mathematically analyzed and compared with different setups. Basically, this scheme implements an additional feedback loop of the difference between the linear velocity of the table and the rotational velocity of the servo motor. The relative velocity can be feedbacked to either the servo motor control system or directly to the table. In order to feedback the relative velocity directly to the table, the Intelligent Guideway can be used.Theoretical, simulation, and experimental comparison studies were conducted with various types of relative velocity control schemes.
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