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하이브리드 중간층 지진 격리 시스템과 빌딩 구조물의 동시 최적화
강주원,김현수 한국공간구조학회 2019 한국공간구조학회지 Vol.19 No.3
A hybrid mid-story seismic isolation system with a smart damper has been proposed to mitigate seismic responses of tall buildings. Based on previous research, a hybrid mid-story seismic isolation system can provide effective control performance for reduction of seismic responses of tall buildings. Structural design of the hybrid mid-story seismic isolation system is generally performed after completion of structural design of a building structure. This design concept is called as an iterative design which is a general design process for structures and control devices. In the iterative design process, optimal design solution for the structure and control system is changed at each design stage. To solve this problem, the integrated optimal design method for the hybrid mid-story seismic isolation system and building structure was proposed in this study. An existing building with mid-story isolation system, i.e. Shiodome Sumitomo Building, was selected as an example structure for more realistic study. The hybrid mid-story isolation system in this study was composed of MR (magnetorheological) dampers. The stiffnessess and damping coefficients of the example building, maximum capacity of MR damper, and stiffness of isolation bearing were simultaneously optimized. Multi-objective genetic optimization method was employed for the simultaneous optimization of the example structure and the mid-story seismic isolation system. The optimization results show that the simultaneous optimization method can provide better control performance than the passive mid-story isolation system with reduction of structural materials.
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전기유동유체와 압전세라믹을 이용한 복합지능구조물의 감쇠특성 연구
윤신일,박근효,한상보,최윤대 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
Many type of smart materials and control laws are available to actively adjust the structure from various external disturbances. Usually, a certain type of control law to activate a specific smart material is well established, but the effectiveness of the control scheme is limited by the choice of the smart materials and the responses of the structure. ER fluid is adequate to provide small but arbitrary control forces at any point along the structure. It was found that active vibration control of the structure embedded with ER fluids failde to suppress the vibration excited with broad band frequency due to the limited change of the structure characteristics. To compensate this limited effect of the control scheme with ER fluid alone, PPF control using PZT as an actuator is added to construct a hybrid controller.
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전기점성유체와 압전세라믹을 이용한 복합지능구조물의 진동제어
윤신일,박근효,한상보 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.8
A hybrid vibration control scheme using ER fluid and PZT patches is proposed. Dynamic characteristics of the beam embedded with the ER fluid can be controled by changing the strength of the electric field applied on the ER fluid, thus provides a mean to avoid the resonance. It was found that active vibration control of the structure embedded with ER fluid failed to suppress the vibration excited with broad band frequency due to the limited change of the dynamic characteristics of the structure. To compensate this limited effect of the control scheme with ER fluid alone, PPF control using PZT patches as sensors and actuators is added to construct a hybrid controller. Experimental results suggests that proposed hybrid controller is effective to suppress the additional resonance vibration that appears when each controller is used alone.
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Buravalla, Vidyashankar R.,Bhattacharya, Bishakh Techno-Press 2007 Smart Structures and Systems, An International Jou Vol.3 No.4
A new hybrid damping technique for vibration reduction in flexible structures, wherein a combination of layers of hard passive damping alloys and active (smart) magnetostrictive material is used to reduce vibrations, is proposed. While most conventional vibration control treatments are based exclusively on either passive or active based systems, this technique aims to combine the advantages of these systems and simultaneously, to overcome the inherent disadvantages in the individual systems. Two types of combined damping systems are idealized and studied here, viz., the Noninteractive system and the Interactive system. Frequency domain studies are carried out to investigate their performance. Finite element simulations using previously developed smart beam elements are carried out on typical metallic and laminated composite cantilever beams treated with hybrid damping. The influence of various parameters like excitation levels, frequency (mode) and control gain on the damping performance is investigated. It is shown that the proposed system could be used effectively to dampen the structural vibration over a wide frequency range. The interaction between the active and passive damping layers is brought out by a comparative study of the combined systems. Illustrative comparisons with 'only passive' and 'only active' damping schemes are also made. The influence and the mode dependence of control gain in a hybrid system is clearly illustrated. This study also demonstrates the significance and the exploitation of strain dependency of passive damping on the overall damping of the hybrid system. Further, the influence of the depthwise location of damping layers in laminated structures is also investigated.
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김선제(Sun Je Kim),Vu Dung Dinh,이상훈(Sang Hun Lee),윤용산(Yong-San Yoon),김경수(Kyung Soo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Due to awareness of climate change and rising of oil price, researches for eco-friendly vehicles or the related fuel saving technology are actively progressed. In this research, CGST(Clutchless Geared Smart Transmission) as new smart transmission which is eco-friendly and comfortable is proposed. And we designed structure of the test bench for verifying the performance of CGST. CGST can improve the comfort and durability of transmission by using a planetary gear set and a motor generator instead of conventional clutch. And as new smart transmission, the motor generator in CGST makes mild hybrid function possible, so the high fuel efficiency is obtained. CGST is rated as the system supplementing the weakness of DCT(Dual Clutch Transmission) and AMT(Automated Manual Transmission). In this paper, we performed structural design of the planetary gear and the multi-axes transmission and selected the motor/generator. Furthermore, we proposed the CGST control logic. The structural design of CGST test bench will play on important role in development of CGST for verifying the operational and torque transferring performance. And CGST test bench will be also used for developing the CGST control logic.
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