scholarly journals Shaking table test and verification of development of an accumulated semi-active hydraulic damper as an active interaction control device

Sadhana ◽  
2016 ◽  
Vol 41 (12) ◽  
pp. 1425-1442
Author(s):  
Ming-Hsiang Shih ◽  
Wen-Pei Sung
Keyword(s):  
Shaking Table Test ◽  
Control Device ◽  
Shaking Table ◽  
Hydraulic Damper ◽  
Interaction Control ◽  
Active Interaction Control ◽  
Active Interaction

scholarly journals Seismic Proofing Capability of the Accumulated Semiactive Hydraulic Damper as an Active Interaction Control Device with Predictive Control

2016 ◽  
Vol 2016 ◽  
pp. 1-19
Author(s):  
Ming-Hsiang Shih ◽  
Wen-Pei Sung
Keyword(s):  
Predictive Control ◽  
High Reliability ◽  
Control Device ◽  
Test Structure ◽  
Control Methods ◽  
Synchronous Control ◽  
Hydraulic Damper ◽  
Interaction Control ◽  
Active Interaction Control ◽  
Active Interaction

The intensity of natural disasters has increased recently, causing buildings’ damages which need to be reinforced to prevent their destruction. To improve the seismic proofing capability of Accumulated Semiactive Hydraulic Damper, it is converted to an Active Interaction Control device and synchronous control and predictive control methods are proposed. The full-scale shaking table test is used to test and verify the seismic proofing capability of the proposed AIC with these control methods. This study examines the shock absorption of test structure under excitation by external forces, influences of prediction time, stiffness of the auxiliary structure, synchronous switching, and asynchronous switching on the control effects, and the influence of control locations of test structure on the control effects of the proposed AIC. Test results show that, for the proposed AIC with synchronous control and predictive control of 0.10~0.13 seconds, the displacement reduction ratios are greater than 71%, the average acceleration reduction ratios are, respectively, 36.2% and 36.9%, at the 1st and 2nd floors, and the average base shear reduction ratio is 29.6%. The proposed AIC with suitable stiffeners for the auxiliary structure at each floor with synchronous control and predictive control provide high reliability and practicability for seismic proofing of buildings.

scholarly journals Active interaction control applied to a lower limb rehabilitation robot by using EMG recognition and impedance model

2014 ◽  
Vol 41 (5) ◽  
pp. 465-479 ◽  
Author(s):  
Wei Meng ◽  
Quan Liu ◽  
Zude Zhou ◽  
Qingsong Ai
Keyword(s):  
Lower Limb ◽  
Muscle Activity ◽  
Activity Level ◽  
Content Type ◽  
Impedance Model ◽  
Interaction Control ◽  
Limb Rehabilitation ◽  
Active Interaction Control ◽  
Lower Limb Rehabilitation ◽  
Active Interaction

Purpose – The purpose of this paper is to propose a seamless active interaction control method integrating electromyography (EMG)-triggered assistance and the adaptive impedance control scheme for parallel robot-assisted lower limb rehabilitation and training. Design/methodology/approach – An active interaction control strategy based on EMG motion recognition and adaptive impedance model is implemented on a six-degrees of freedom parallel robot for lower limb rehabilitation. The autoregressive coefficients of EMG signals integrating with a support vector machine classifier are utilized to predict the movement intention and trigger the robot assistance. An adaptive impedance controller is adopted to influence the robot velocity during the exercise, and in the meantime, the user’s muscle activity level is evaluated online and the robot impedance is adapted in accordance with the recovery conditions. Findings – Experiments on healthy subjects demonstrated that the proposed method was able to drive the robot according to the user’s intention, and the robot impedance can be updated with the muscle conditions. Within the movement sessions, there was a distinct increase in the muscle activity levels for all subjects with the active mode in comparison to the EMG-triggered mode. Originality/value – Both users’ movement intention and voluntary participation are considered, not only triggering the robot when people attempt to move but also changing the robot movement in accordance with user’s efforts. The impedance model here responds directly to velocity changes, and thus allows the exercise along a physiological trajectory. Moreover, the muscle activity level depends on both the normalized EMG signals and the weight coefficients of involved muscles.

scholarly journals ENERGY DISSIPATION BEHAVIOURS AND SEISMIC REDUCTION PERFORMANCE OF A PROPOSED VELOCITY AND DISPLACEMENT DEPENDENT HYDRAULIC DAMPER (VDHD)

2010 ◽  
Vol 16 (3) ◽  
pp. 428-438 ◽  
Author(s):  
Wen-Pei Sung ◽  
Ming-Hsiang Shih ◽  
Yu-Kuang Zhao
Keyword(s):  
Energy Dissipation ◽  
Shaking Table Test ◽  
Maxwell Model ◽  
Friction Model ◽  
Shaking Table ◽  
Analysis Model ◽  
Relief Valve ◽  
Hydraulic Damper ◽  
Superior Effect ◽  
Simulation Results

A new oil‐pressure Velocity and Displacement Dependent Hydraulic Damper (VDHD) is proposed by adding an additional Relief Valve parallel to the Throttle Valve with a different aperture size. This objective is to obtain an adaptive control by changing the damping coefficient of the VDHD for better control of structural movement during earthquake. In order to simulate its actual energy elimination, a mathematical analysis model is developed based on the Maxwell Model, which is modified by adding a serial friction model and a small damper parallel to the friction model in this study. The mathematical simulated results are compared with the actual energy‐dissipating behaviours of this proposed damper. The comparison shows that this proposed mathematical modelling could accurately simulate the relation of force and displacement as well as the relation of force and velocity during the process of energy dissipation. In addition, results of both the laboratory shaking table test and simulation analyses are used to test and verify the seismic reduction performance of this proposed damper. The experimental and simulation results show that in spite of the magnitude of the earthquake, the proposed VDHD device has a superior effect on the control of structural displacement by achieving effective acceleration reduction. Santrauka Siūlomas naujas hidraulinis i greiti ir poslinki reaguojantis slopintuvas (HGPS), sukurtas prie droselinio vožtuvo su kintama apertūra pridejus atbulini vožtuva. Buvo siekiama užtikrinti geresne adaptyvia konstrukcijos judejimo žemes drebejimo metu kontrole keičiant HGPS slopinimo koeficienta. Norint modeliuoti tikraji energijos pašalinima, buvo sukurtas matematinis modelis, pagristas Maksvelo modeliu. Šis modelis buvo pakeistas prie trinties modelio pridejus nuosekluji trinties modeli ir nedideli slopintuva. Matematinio modeliavimo rezultatai lyginami su tikraja siūlomo gesintuvo energijos sklaida. Palyginimas rodo, kad matematinio modeliavimo rezultatai atitinka tikraja siūlomo gesintuvo elgsena. Lyginant skaičiavimo rezultatus su eksperimentiniais matyti, kad siūlomas matematinis modeliavimas leidžia tiksliai išreikšti jegos ir poslinkio bei jegos ir greičio ryšius, susidarančius energijos sklaidos metu. Laboratoriniai rezultatai, gauti naudojant vibracini stala, ir modeliavimo rezultatai taikomi tirti bei tikrinti siūlomo gesintuvo itaka mažinant seismines konstrukcijos charakteristikas. Eksperimentiniai ir modeliavimo rezultatai rodo, kad nepaisant žemes drebejimo laipsnio, siūlomas gesintuvas labai pagerina konstrukcijos poslinkiu kontrole efektyviai mažindamas judejimo pagreiti.

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