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 20 for “"damping control"”.
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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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Variable damping controller for a prosthetic knee during swing extension
… during level ground walking. A variable damping control strategy has been developed for swing extension in order to improve gait symmetry and reduce energy expenditure during level ground walking. Preliminary biomechanical studies suggest that the knee utilizes a variable damping control …
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Decentralized control of large space structures:an overview
… techniques for the design of decentralized control strategies for the active control of vibrational damping in large space structures. A brief description of the finite element method is presented to explain the derivation of mathematical models of flexible structures represented by systems …
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Wide Area Analysis and Application in Power System
… system and the optimization theory, the optimal control of small-signal stability of power electric systems are solved. From the perspective of stability margin, global coordination of controller parameters is studied to ensure the stable operation of power grids. The main contents of this thesis …
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Innovative System for Seismic Control Strategies
… alternative approaches, installing auxiliary damping devices such as tuned mass dampers (TMDs) is a very reliable solution to mitigate wind-induced vibration of tall buildings. However, regardless of the different distribution strategies, installing TMD systems means adding additional masses …
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Optimal Upfc Control And Operations For Power Systems
… of three parts. In the first part, optimal control strategies are developed for Unified Power Flow Controller (UPFC) following the clearance of fault conditions. UPFC is one of the most versatile Flexible AC Transmission devices (FACTs) that have been implemented thus far. The optimal …
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Adaptive modal damping for advanced LIGO suspensions
… work in this thesis develops an adaptive modal damping control scheme for the suspended optics steering the laser beams in the LIGO interferometers. The controller must damp high quality factor mechanical resonances while meeting strict noise and disturbance rejection requirements with the …
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Maneuver and control of flexible spacecraft
… rigid-body modes with the mass acting as the control gain. The premaneuver eigenvectors are used as admissible vectors to reduce the degrees of freedom describing the vibration of the spacecraft during the maneuver. Natural control and uniform damping control are used to suppress the …
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Transient Motion Control of Passive and Semiactive Damping for Vehicle Suspensions
… and semiactive dampers. The semiactive damper control policies that are examined include the previously developed policies of on-off skyhook, continuous skyhook, and on-off groundhook control, along with a newly developed method of fuzzy logic semiactive control. The model input will include …
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A dynamic damping device for payload pendulations of construction cranes
… construction industry through the application of damping systems on construction cranes. To achieve this goaL an experimental model will be developed and tested. The design process will include an analysis of operational constraints, theoretical design, and physical testing. Tuned mass damping …
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Dynamic simulation of semi-active suspension systems for durability analysis
… effect of employing a selection of semi-active control strategies on the components' durability. To achieve this early in the design cycle, accurate representations of the load histories must be generated as these histories are the prerequisite in predicting fatigue life. This requires an …
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RF-MEMS switches for reconfigurable antennas
… packaging (contamination layers) and actuation control (high impact force, wear, fatique). This Thesis focuses on the design and control of a novel ohmic RF-MEMS switch specified for reconfigurable antennas applications. This new switch design focuses on the failure mechanisms restriction, the …
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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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Robust decentralized control of power systems through excitation systems and thyristor controlled series capacitors
… objective of this work is robust decentralized control of power systems through excitation systems and Thyristor Controlled Series Capacitors (TCSC). Hence the dissertation consists of two parts. In the first part an algorithm for the design of nonlinear decentralized excitation control is …
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Coordinated Control of Inter-area Oscillations using SMA and LMI
… of Power System Stabilizers (PSSs) which provide damping control action through excitation control systems of the generating units. However, study of recent blackouts has shown that the control action provided by a PSS alone is not sufficient for damping oscillations in modern power systems which …
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A pneumatic semi-active control methodology for vibration control of air spring based suspension systems
… valve, and an accumulator, where the spring and damping functions are combined into one package. The spring and accumulator provide the spring characteristics, and the computer controlled adjustable valve provides the damping characteristics by automatically adjusting the air flow between the air …
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Power System Dynamic Control and Performance Improvement Based on Reinforcement Learning
… (RL) techniques for power system dynamic control, particularly voltage and frequency control. The conventional control strategies used in power systems are complex and time-consuming due to the complicated high-order nonlinearities of the system. RL, which is a type of neural network-based …
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DC fault protection in HVDC system and the impact on AC frequency response
… strategies utilizing the flexible power flow controllability of MMC-HVDC. Different control strategies for providing frequency support in a 2-terminal and 3-terminal HVDC systems are studied in detail.;For HVDC systems, DC protection strategy can significantly impact on the duration of power …
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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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Development of Precision, Field-Deployable, Opto-Mechanical Instrumentation: Accessibility as a Functional Requirement
… technologies. Using novel optical cavity control techniques and a combination of fiber and free space optics, the presented design reduces the total number and size of the required components, leading to a final system with a compact footprint. Such a system has the potential to expand the …