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Earthquakes and Structures Volume 31, Number 2, August 2026 , pages 235-251 DOI: https://doi.org/10.12989/eas.2026.31.2.05 |
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Experimental evaluation of control hardware for an isolated structure by LSCMD with LEM control algorithm |
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Qi-Yang Liao, Chan-Jung Kang, Shih-Yu Chu, Ding-Jie Lin, Chih-Te Chien, Chih-Hua Peng
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| Abstract | ||
| This study investigates an isolated structure equipped with a Leverage-type Stiffness-Controllable Mass Damper (LSCMD) system using the Least Energy Method (LEM) control algorithm. Although the isolation structure can effectively reduce structural acceleration, it may lead to excessive isolation displacement when encountering a long-period near-fault earthquake. The objective of the LSCMD system in this study is to mitigate isolation displacement. Two control hardware configurations are examined: a Programmable Logic Controller (PLC)-based control platform and a motion card-based control platform. The PLC-based control platform is limited by its pre-programmed settings, which cannot be manually adjusted to the servo motor parameters. In contrast, the motion card-based control platform allows modification of the motor rotation speed and the PID gains via National Instruments Measurement & Automation Explorer (NI-MAE), which effectively enhances the control performance of LSCMD. This study implements the Shaking Table Tests (STT) and shows that the motion card-based control platform achieves smaller damper strokes. In addition, the pivot displacement is compared to validate the control performance of LEM. The results confirm that the motion card control-based platform provides a stable and accurate experimental framework applicable to other control algorithms and devices. | ||
| Key Words | ||
| least energy method; LSCMD; motion card-based control platform; programmable logic controller-based control platform; shaking table tests | ||
| Address | ||
| Qi-Yang Liao: Facility Technology Center, China Engineering Consultants, Inc., No.185, Sec. 2, Xinhai Road, Taipei, Taiwan Chan-Jung Kang: Department of Civil Engineering, I-Shou University, No.1, Sec. 1, Syuecheng Road, Kaohsiung, Taiwan Shih-Yu Chu: Department of Civil Engineering, National Cheng Kung University, No.1, University Road, Tainan, Taiwan Ding-Jie Lin: HD Engineering Consultants Co., Ltd., Taiwan Chih-Te Chien: Yunlin-Chiayi-Tainan Region Branch Office, Highway Bureau, MOTC, Taiwan Chih-Hua Peng: Great Work Design Consultant Ltd., Taiwan | ||