###### Abstract  
The Active Rotary Inertia Driver (ARID) system is a novel vibration control system that can effectively mitigate the swing vibration of suspended structures. Parametric analysis is carried out using Simulink based on the mathematical model and the effectiveness is further validated by a series of experiments. Firstly, the active controller is designed based on the system mathematical model and the LQR (linear quadratic regulator) algorithm. Next, the parametric analysis is carried out using Simulink to study the key parameters such as the coefficient of the control algorithm, the rotary inertia ratio. Lastly, the ARID system control effectiveness and the parametric analysis results are further validated by the shaking table experiments. The effectiveness and robustness of the ARID system are well verified. The dynamic characteristics of this system are further studied, and the conclusions of this paper provide a theoretical basis for further development of such unique control system. s +
Footnote †: journal: Applied  
_Applied_  
_Acticle_  
in civil engineering for their superior effectiveness and larger spectral bandwidth. The feasibility of AMD application on the civil structures and ocean engineering structures has been studied [27; 28; 29; 30; 31; 32]. Semi-active systems have been developed over the past decades. They can alternate their parameters in real time to ensure a superior, low-energy and stale control performance [33; 34; 35]. Although these passive, active and semi-active dampers are reliable and efficient, and they can effectively reduce the responses of the civil structures under external excitations in many conditions, they are almost ineffective in the swing motion control of suspended structures. Some researchers concentrated on solving the similar problems of pendulum motions control [36; 37]. They designed controllers [38], linear and nonlinear control algorithms [39], an optimal performance control scheme [40] and an adaptive output-based command shaping (AOCS) technique [41] for the vibrations of cranes. But the hanging points of these crane structures were not fixed, the control technologies that reduced the vibrations relied on the moving of the hanging points. The control technologies need enough moving space in the structural hanging point. However, the hanging points of many suspended structures are fixed, such as ship cranes. Their hanging points are fixed in the determined position. The suspended control technologies above are not suitable for the swing motion control of these structures. Then, the Tuned Rotary Inertia Damper (TRID) system was proposed. In the TRID system, the rotary mass inertia is attached to the suspended structure. The torsional spring element embedded with a damping mechanism is installed between the mass inertia and the structure. The mass inertia rotation can apply control torque/moment to structures. The effectiveness of the TRID system for swing motion control was verified by a series of theoretical analyses and experiments. However, the TRID system has some defects. It cannot work normally when the swing angle is very small. Furthermore, it has time lag effect and low robustness. To solve this problem, the Active Rotary Inertia Driver (ARID) system is proposed in this paper, based on the TRID system. Compared with the common control devices that can apply control force to the structures, the ARID system can apply control torque to structures by the rotation of mass inertia. The mass inertia is driven by a motor according to the structural response in real time. The ARID system can work installed in the suspended structures, compared to the control technologies that work relying on the movement of hanging points. The ARID system can be used for suspended structures in which hanging points are fixed in determined positions. Moreover, the ARID system can work without relying on the structural responses, and it has better control effectiveness and robustness compared to the TRID system.