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 16 of 16 for “"Sliding Surface"”.
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Active and Semi-Active Control of Civil Structures under Seismic Excitation
… different candidate control strategies, the sliding mode control approach emerges as a convenient alternative, because of its superb robustness under parametric and input uncertainties. The analytical developments and numerical results presented in this dissertation are directed to …
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Investigation of Plasma Electrolytic Oxidation (PEO) Coated Bores in Internal Combustion Engines
… along the piston ring and cylinder bore sliding surface. For PEO coatings, wear is a limiting factor and this study aims at understanding the main influencing factors for wear on PEO in cylinder bores. Through fired-engine dynamometer testing, it was determined that large piston-to-bore …
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Estudo de sistemas de controle a estrutura variável
… of these systems, is the possibility of sliding regimes, when the controlled system becomes invariant. An extension of Liapunov's second method is used for the stability study, and the analysis of the relationship between the sliding regime condition, and the stability of an invariant …
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A control system design technique for nonlinear discrete time systems
… approach that parallels existing continuous time sliding surface concepts. Modifications to the basic algorithm allow for system models with time-variant or uncertain parameters, time delays in the control input, and external disturbances. A major feature of the method is its straightforward …
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Time-delay systems : stability, sliding mode control and state estimation
… This thesis is concerned with the stability, sliding mode control and state estimation problems of time-delay systems. Throughout the thesis, the Lyapunov-Krasovskii (L-K) method, in conjunction with the Linear Matrix Inequality (LMI) techniques is mainly used for analysis and design. Firstly, …
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Cooperative control of multi-agent systems with time-delays
… with time-delays. The first one is Robust Sliding-Mode Cooperative Control for Multiple Time-Delay Systems with Model Uncertainties and Disturbance, in which, it designed a sliding mode cooperative control law for a general time-delay system with model uncertainty and external disturbance. …
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Analyzing internal shearing in compound landslides using MPM
… to the resistance offered by basal shear surfaces, internal shearing also influences the stability and kinematics of compound landslides. For compound landslides, internal shearing is essential to develop feasible sliding mechanisms. The internal distortion is caused by the formation of …
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Laboratory analysis of restrenghtening on simulated faults
… that effect stick-slip behavior of bare rock surfaces, and healing of simulated fault gouge under a range of physico-chemical conditions. We have performed experiments to investigate the repetitive stick-slip behavior of initially bare granite surfaces (nominal contact area 25 cm2). The tests …
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Modeling and control of smart structures embedded with magnetorheological devices
… To achieve robustness, a second-order sliding mode controller is designed and applied to the MRE to provide a real-time feedback control of structures. The performance of the proposed technique is evaluated in the simulation of a seismically excited three-storey benchmark building …
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A control theoretic approach to mitigate viral escape in HIV
… In this case the optimal switching rule is on a sliding surface. For the discrete-time version several algorithms based on linear programming are proposed to reduce the computational burden whilst still computing the optimal sequence. Relaxing the demand of optimality, we provide a result on …
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Active fault-tolerant control of nonlinear systems with wind turbine application
… TSDOFC; T-S observer-based feedback control; Sliding Mode Control (SMC). The theoretical concepts have been applied to an offshore wind turbine (OWT) application study. The key developments that present in this thesis are:• The development of three active Fault Tolerant Tracking Control (FTTC) …
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Dry sliding wear of metals: From subsurface microstructure to tribological behavior
Dry sliding wear behavior of Cu-15Ni-8Sn bronze was studied by performing pin-on-disc wear tests against different counterface materials under various loads. The microstructure of the debris, worn surface and subsurface of the bronze were characterized using scanning electron microscopy (SEM), …
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Nonlinear Analysis and Control of Standalone, Parallel DC-DC, and Parallel Multi-Phase PWM Converters
… converters combine the concepts of multiple-sliding-surface and integral-variable-structure control. They are easy to design, robust, and have good transient and steady-state performances. Furthermore, they achieve a constant switching frequency within the boundary layer and hence can be …
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Soil-Landscape Modelling in an Andean Mountain Forest Region in Southern Ecuador
… to the channel network are caused by shallow subsurface flow removing clay particles downslope. Deeper soil layers are not influenced by the same process and therefore showed different texture properties. Terrain parameters could only explain the spatial distribution of topsoil properties to a …
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Enhancement of the Sliding Hinge Joint Connection with Belleville Springs
The Sliding Hinge Joint (SHJ) was conceived and initially developed by Charles Clifton from 1998 to 2005 and is now in use in over NZD 4 billion of new buildings. It is a low damage semi-rigid beam to column connection for MRSF seismic-resisting systems, that is intended to be rigid under …
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Sacrificial bearing components for quasi-isolated response of bridges subject to high-magnitude, low-probability seismic hazard
… elastomer and a stainless steel-on-Teflon sliding surface. The elastomeric bearings are further restrained in the transverse bridge direction with stiffened, L-shaped retainer brackets. Full-size bearing specimens were subjected to compression loads of up to 100 kips, cyclic displacements …