Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Semi-Active Control"”.
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Semi-Active Control of Air-Suspended Tuned Mass Dampers
… very flexible with negligible damping. Vibration control devices and strategies are constantly being developed to eliminate/dissipate the unwanted vibration and to increase the serviceability level of such structures. One such method for abating the vibration is tuned mass damping.In this …
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Dynamic Analysis of Semi-Active Control Techniques for Vehicle Applications
… study evaluates the dynamic response of five semi-active control policies as tested on a single suspension quarter-car system. Incorporating a magneto-rheological damper, the full-scale 2DOF quarter-car system was used to evaluate skyhook, groundhook, and hybrid control. Two alternative …
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Improvement of semi-active control suspensions based on gain-scheduling control
… study presents the development of a non-linear control strategy for a semi-active suspension controller using a gain-scheduling structure controller. The aim of the study is to overcome the constraints of conventional control strategies and improve semi-active suspension to achieve performance …
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Active and Semi-Active Control of Civil Structures under Seismic Excitation
The main focus of this study is on the active and semi-active control of civil engineering structures subjected to seismic excitations. Among different candidate control strategies, the sliding mode control approach emerges as a convenient alternative, because of its superb robustness under …
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Semi-active control for independently rotating wheelset in railway vehicles with MR dampers
… thesis presents details of an investigation of a controller for MR damper in the implementation of semi-active control, for primary suspensions of the independently rotating railway vehicles. This research focuses on using MR damper and it addresses on three main aspects when designing semi-active …
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Semi-active control of elastic and inelastic building structures with piezoelectric friction dampers
<p>"Semi-active control has received extensive attention in recent years because it offers the best features of both passive and active control. Significant progress has been made in the field of structural control to mitigate the seismic responses of building structures with semi-active …
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Mitigation of traffic-induced bridge vibrations through passive and semi-active control devices
… bridge vibrations through the integration of control devices to extend the service life of bridges. There are three main classes of structural control devices: passive, semi-active, and active control. Each control scheme has advantages and disadvantages which are discussed in this thesis. To …
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Modeling, Analysis and Testing of a Semi-Active Control System for Landing Gear Applications
… recent studies on the potential benefits of controllable dampers. Controllable dampers can use a fluid with controllable properties, such as Magneto - Rheological fluid (MR fluid), or control the damping force by changing orifice size. For this project, controllable dampers were created using …
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Nonlinear Mr Model Inversion for Semi-Active Control Enhancement With Open-Loop Force Compensation
The increased prevalence of semi-active control systems is largely due to the emergence of cost effective commercially available controllable damper technology such as Magneto-Rheological (MR) devices. Unfortunately, MR dampers exhibit highly nonlinear behavior, thus presenting an often over-looked …
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A pneumatic semi-active control methodology for vibration control of air spring based suspension systems
… the spring characteristics, and the computer controlled adjustable valve provides the damping characteristics by automatically adjusting the air flow between the air spring and the accumulator.</p> <p>An extensive analysis and investigation of the plant dynamics is performed. A dynamic plant …
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Combined Shock and Vibration Isolation Through the Self-Powered, Semi-Active Control of a Magnetorheological Damper in Parallel with an Air Spring
… the use of an air spring in parallel with a controlled magnetorheological fluid damper. The benefits of combining shock and vibration isolation into a single package is discussed. Modeling and control issues are investigated and test and simulation results are discussed. It is shown that this …
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Structural control strategies for earthquake response reduction of buildings
… these hazards to building structures. Structural control has been considered one of the most effective strategies to protect buildings from extreme dynamic events such as earthquakes and strong winds, and has been applied to numerous real buildings in recent years. Structural control strategies …
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Semi-active damping control for vibration isolation of base disturbances
This thesis is concerned with semi-active damping control for vibration isolation of base disturbances. The aim is to investigate the effectiveness and suitability of semi-active damping control strategies for improving steady-state vibration isolation. A single-degree-of-freedom (SDOF) system, …
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Dynamic simulation of semi-active suspension systems for durability analysis
The benefits of vehicles with semi-active suspension systems have been widely accepted, mainly for improvement in ride and handling, over the passive system. However, the durability of the suspension components resulting from this implementation received very little attention. Therefore, this …
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Smart wireless control of civil structures
Structural control techniques are an alternative approach to protect structures from natural hazards that continue to plague our nation’s infrastructure. Due to their onboard sensing, communication, and computational capabilities, wireless smart sensors, which have become popular for structural …
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Input identification, footbridge control and non-linear identification of a MR damper
… of a pedestrian footbridge and the use of a semi-active tuned mass damper. In this respect, the work appears threefold since the first and third part regard identification of a realistic model for the damping device and semi-active control of the magneto-rheological damper. In this respect, …
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Dynamic range implications for the effectiveness of semi-active tuned mass dampers
… bandwidth and often require a significant mass. Active systems, such as the active mass driver, have been utilized to improve the effectiveness of the TMD concept, but these systems require significant power and bring the inherent risk of instability. Hybrid semi-active schemes with variable …
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Structural control optimisation and health monitoring using newly developed techniques
… or machines. In the field of civil engineering, control and identification of the state of health of the structure during the dynamic loads, such as earthquakes and attempt to suppress the vibrations and detect any damage or potential hazard are of vital importance and have posed a great …
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Nonlinear Investigation of the Use of Controllable Primary Suspensions to Improve Hunting in Railway Vehicles
… speed of the vehicle and the wheel-rail interactive forces that result from the conicity of the wheel-rail contours and the friction-creep characteristics of the wheel-rail contact geometry. Hunting can lead to severe ride discomfort and eventual physical damage to wheels and rails. A …
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Design and Analysis of Switching Circuits for Energy Harvesting in Piezostrutures
… with a general method for the analysis of a semi-active control technique for a fast-shunt switching system. The benefit of the semi-active system is the reduction in power consumption, which is a significant disadvantage of a fully active system compared with a passive system. A semi-active …
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