Study On Theoretical And Experimental Study Of Swing Vibration Control Based On The Active Rotary Inertia Driver(ARID)System

Structural vibration has an adverse effect.Severe vibration can lead to the failure of the whole structure.Vibration control techniques play vital roles in mitigating structural vibration response.Structural control devices are developed quickly over the past few decades.The devices mainly employ new active,passive,and semi-active control technologies.The applications of passive vibration control devices are very common.The effectiveness of passive control techniques applied in buildings,bridges,pipelines,and wind turbines have been studied.Furthermore,active and semi-active control technologies develop quickly as the electronic technologies developed quickly over the past decades.Active and semi-active control technologies have superior effectiveness and larger spectral bandwidth.Therefore they gradually play an irreplaceable role in some vibration control problems.The effectiveness of the application of active control systems such as active mass damper(AMD)on high-rise structures and offshore platforms were studied.Additionally,the control design considering structural nonlinearity were studied.The control algorithms used in the active control system were studied based on modern control theory considering the effect of interaction between the target structure and actuator.Active vibration control techniques have been widely applied in civil engineering,mechanical engineering,aerospace engineering,and other fields.Moreover,they can be further developed to solve severe problems that cannot be solved by passive technologies.The pendular vibrations of the suspended structures are a common form of motions.They mainly include three basic vibration modes according to the relationship between the lifting point and the moving direction of structures: the swing vibration mode,the sway vibration mode,the swing and sway coupling vibration mode.Traditional vibration control devices such as tuned mass damper(TMD),active mass damper(AMD)are reliable and efficient for vibration control of civil engineering structures.Based on many studies and practical applications,it can be observed that when traditional control devices are almost ineffective in swing vibration control of suspended structures.According to the swing vibration problem,a kind of device called tuned rotary inertia damper(TRID)system was proposed before.In this system,rotary inertia mass is attached to structure.The torsional spring element embedded with a damping mechanism is installed between inertia mass and structure.Control torque/moment can be applied to structures by rotation of mass rotary inertia.The effectiveness of the TRID system for swing vibration control was verified by a series of theoretical analysis and experiments.However,researchers found that the TRID system has some defects such as low effectiveness and robustness.The TRID system cannot be started normally because of the small swing angle.Moreover,the TRID miniaturization device has a time lag effect.The second chapter has studied the basic concept of the ARID system.A kind of active control system for swing vibration control named Active Rotary Inertia Driver(ARID)is proposed based on the TRID system.In this novel system,rotary inertia is driven by a rotating actuator instead of relying on the torsional spring element.The rotary mass inertia rotates to apply control moment to structures rather than applying force by mass moving along a line in most traditional control devices.The system has better effectiveness and robustness.Furthermore,no frequency modulation and initial responses are needed to make the system work normally.Firstly,the mathematical model of the proposed system is derived based on classical Lagrangian principles.Second,the LQR controller is designed based on the mathematical model,and the effectiveness of the system is analyzed.The third chapter has investigated Parametric analysis is done using Simulink system and the effectiveness of ARID is further validated.First,the non-linear equations and the simplified analytical model are proposed.Next the parametric analysis is done using Simulink to compare influence of the key parameters of ARID such as the inertia ratio,mass ratio,coefficient of control algorithm,length ratio,excitation frequency.Then some parametric results and optimal interval are got.The fourth chapter introduces the design of ARID shaking table test system for small scale suspension structure.In order to test the performance of ARID control system and verify the correctness of numerical simulation and parameter analysis,a small scale suspension structure ARID shaking table test system is designed.Quanser shaking table is used in the system,and DC motor produced by Maxon Company is used as the driver of ARID system.Different excitations are applied to the suspension structure by the shaking table at the suspension point,and the pendulum angle of the photoelectric encoder acquisition structure is installed at the suspension point.The fifth chapter has introduced the experiments of the ARID system.The experimental and numerical results of ARID system are compared.In the previous work,the concept of active inertia drive control system(ARID)was put forward.Based on the theoretical model establishment,parameter analysis and experimental system design of ARID system,the influence of system parameters on control effect was studied through model test,and the performance of the system in swing motion control was further studied.A series of validation tests,such as free attenuation and forced vibration,were carried out,and the validation tests for the results of parameter analysis were carried out,which provided a theoretical basis for optimizing the parameter design of the system.The sixth chapter five kinds of work condition(Free decay under sinusoidal excitation,forced vibration under sinusoidal excitation,sinusoidal sweep excitation,earthquake simulation excitation and ocean wave simulation excitation)experiments are carried out using the single way shaking table.Last the experimental simulation is carried out using Simulink based on structure motion equation to compare with the experimental results.It can be concluded that the ARID system is effective and feasible in structural swing vibration control after the research.Furthermore,the feasibility of the ARID system application in multi-hazards vibration control is proved in mechanism.