Study On Vibration Control And State Monitoring Of Suspensory Structures Based On TRID, TMD And ARID

Suspensory structures are very common in production,such as all kinds of hook system,gondola of high rise building,suspending platform used in construction and so on.These suspensory structures have common issue of pendular vibration caused by environmental disturbance which affecting efficiency and safety of production.Now,the main measure of reducing vibration is imposing control force on suspensory points,such as skilled operators use manual joysticks to juggle the trolley back-and-forth so that the payload swing can be stabilized.Another measure of reducing pendular vibration is imposing control force on the terminal point of suspensory structures,such as installing passive control device on the terminal point of suspensory structures.This paper focused on the issue of planar pendular vibration of suspensory structures and studied passive control of planar pendular vibration of suspensory structures based on Tuned Rotary Inertia Damper(TRID),Tuned Mass Damper(TMD),Active Rotary Inertia Damper(ARID)and monitoring of state of motion of suspensory structures.The second chapter has studied impact of rotary inertia ratio,mass ratio,rotary radius ratio and installation position of TRID on control effectiveness.Firstly,theoretical analysis and numeric analysis have been carried on.Then,theoretical and numeric analysis when TRID installation position is varying are presented and some advice of TRID tuning and installation position has been presented.At last,the influence of initial velocity of TRID to control has been studied.The third chapter has investigated the control of suspended structures under in-plane swing motion mode by means of TMD.In order to analyze the control performance of TMD for in-plane swing motion mode,simplified models of suspended structures with TMD are developed in different installation conditions and equations of motion of models are solved using Simulink.Results show that only the normal TMD is valid in control of in-plane swing motion mode of suspended structures as the different characteristics of acceleration along tangential and normal directions of in-plane swing motion mode.And in normal TMD condition,analysis shows that the tuning principle is different when the number of TMD is two and single.The fourth chapter has investigated the monitoring of suspended structures under inplane swing motion mode by means of accelerometer.Analysis shows that the principles of TMD control and vibration based monitoring by accelerometer for in-plane swing motion mode are unified.At first,the simplified calculation model of the suspended structure with accelerometer is developed to analyze in-plane swing motion mode monitoring.The model is similar with that of the suspended structures with TMD.And based on the analysis of simplified calculation model and equations of normal acceleration of in-plane swing motion mode,a vibration based state monitoring method based on normal acceleration data is proposed.The proposed method can avoid the error of integration and drifting of gyroscope.At last,the experiment is carried out to measure in-plane swing motion mode of suspended structures using inclinometer and accelerometer and it verifies the aforementioned theoretical and numerical analysis of control and monitoring of in-plane swing motion mode of suspended structures with TMD and accelerometer.The fifth chapter has investigated the control effectiveness of ARID to suspensory structures under in-plane swing motion mode.Firstly,equations of motion of the suspensory structure with ARID has been established.Then,available of controlling inplane swing vibration of suspensory structures by ARID has been proved through a specific calculation example.And advantages of controlling in-plane swing motion of suspensory structures by ARID compared with TRID and AMD have been summarized.