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 28 for “"passive system"”.
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Methods for comparative assessment of active and passive safety systems with respect to reliability, uncertainty, economy, and flexibility
Passive cooling systems sometimes use natural circulation, and they are not dependent on emergency AC power or offsite power, which can make designs simpler through the reduction of emergency power supplying infrastructure. The passive system approach can lead to substantial simplification of the …
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Adapting a human thermoregulation model for predicting the thermal response of older persons
… The Model defines the body as two interrelating systems of the body structure (passive system) and the control system of the central nervous system (active system). The Older person’s passive system of the model was developed by meticulously extracting relevant experimental data from selected …
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You Are Academia
… presents the modern landscape of academia as a passive system of exponential growth. The core gameplay mechanic suggests that the fundamental purpose of current higher learning structures is meant to improve revenue and the quantity of works produced—not necessarily the quality of student …
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An Exploration of the Natural Ventilation Strategies At the World Trade Center, Amsterdam
… movement. In fact many of the newer passive ventilation strategies under development can be seen in Kohn, Pedersen Fox International (KPFI) current commission for the World Trade Center (WTC) currently under construction in Amsterdam, Netherlands. This multi-million square foot …
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CargoNet : micropower sensate tags for supply-chain management and security
This thesis describes the development of a system of sensate active RFID tags for supply-chain management and security applications, necessitated by the current lack of commercial platforms capable of monitoring the state of shipments at the crate and case level. To make a practical prototype, …
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A Protocol to Determine the Performance of South Facing Double Glass Façade System-A Preliminary Study of Active/Passive Double Glass Façade Systems
… the performance of a double glass envelope system. As a proof of concept, the protocol was applied to an experimental study of a south-facing, single story double glazed ventilated wall system. Two modular full-scale double glazed window models with naturally or mechanically assisted …
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Active suspension co-design for lateral stability of rail vehicles
… railways. Traditionally railways have utilized passive suspension systems, but maintaining dynamic stability at higher speeds demands enhancements to existing rail vehicle suspensions. One strategy to improve dynamic performance is to incorporate active or semi-active elements, such as force …
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Experimental Evaluation of Semiactive Magnetorheological Primary Suspensions for Heavy Truck Applications
… of the truck with the original (stock) passive system. Results from operation with the adjustable dampers fixed in both their on and off states are also given. The performance comparison between the semiactive and the original passive system is performed for two different driving …
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Seismic retrofitting of deficient Canadian buildings
… the performance of hybrid base isolation systems is then presented. The performance of passive and semi-active hybrid base isolation system is evaluated through the use of a SIMULINK computer model of a typical two-story concrete frame building. A significant reduction in interstory …
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An Invertible Open-Loop Nonlinear Dynamic Temperature Dependent MR Damper Model
… force capacity and better performance than a passive system, without the added expense and power draw of a fully active system, all while maintaining failsafe performance. To fully exploit the capabilities of an MR Damper, a high fidelity controller is required that is simple and easy to …
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Dynamic simulation of semi-active suspension systems for durability analysis
… 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 research …
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Analysis and optimization of passive knee prosthetic design parameters over varying cadences
… this gap through the ATKnee, a low-cost, passive prosthetic knee that employs the use of spring and damper components to replicate the knee torque of the able-bodied human knee. In this study, we build upon prior work to optimize the components used in the ATKnee by accounting for results …
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The impact of passive safety systems on desirability of advanced light water reactors
… the advanced light water reactor designs with passive safety systems are more desirable than advanced reactor designs with active safety systems from the point of view of uncertainty in the performance of safety systems as well as the economic implications of the passive safety systems. Two …
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Prediction techniques for passive systems' probability of failure
… framework of the on-going debate centered on Passive System reliability. Its aim is to provide insights into the design of a dependable method to evaluate the reliability of Passive Systems. In order to achieve this, a method is proposed that focuses on the identification of the fundamental …
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Numerical Simulations of Interactions Among Aerodynamics, Structural Dynamics, and Control Systems
… to be the elements of a single dynamic system. All the governing equations are integrated simultaneously and interactively in the time domain; a predictor-corrector method was adapted to perform this integration. For long-span bridges, the simulation predicts the onset of flutter …
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Design and Analysis of Switching Circuits for Energy Harvesting in Piezostrutures
… 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 system under consideration is a semi-actively shunted …
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The development and evaluation of a novel passive approach to maintaining residuum volume in trans-tibial amputees
… widely available. In this thesis an alternative (passive) approach to reducing pressures within the socket during gait is proposed, based on building in a distal void into the socket, thereby exploiting Boyles’ Law. The aims of this thesis were to: 1) develop a test prosthesis, allowing for …
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Simultaneous active passive/control of extensional and flexural power flows in infinite thin beams
Passive control techniques to minimize structural vibrations are limited with respect to the amount of attenuation obtained especially in the low-frequency region but do not require adding any power. Active control methods are effective for reducing structural vibrations, especially at low …
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Shock isolation using switchable stiffness
… principal physical properties that control the passive system shock response. The problem of shock response control is divided in two stages. Firstly, the maximum response whilst a shock is applied is considered, and the effectiveness of a switchable isolation stiffness strategy is evaluated. …
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Development and evaluation of biarticular transtibial prostheses for level-ground amputee walking
… development of two such biarticular prosthesis systems. The first, tested on two participants, employed a quasi-passive clutched-spring knee orthosis, approximating the largely isometric behavior of the biological gastrocnemius. The second device, tested on six participants, provided positive …
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