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 81 for “"preload"”.
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Data preload for superscalar and VLIW processors
Processor design techniques, such as pipelining, superscalar, and VLIW, have dramatically decreased the average number of clock cycles per instruction. As a result, each execution cycle has become more significant to overall system performance. To maximize the effectiveness of each cycle, one must …
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Strain based preload measurement in drive axle pinion bearings
… developed and patented will be used to measure preload in automotive drive axle pinion bearings. This technique utilizes strain gages placed in notches that have been machined into the outer diameter of a bearing cup. The performance of two gage types, semiconductor and metal foil, are compared. …
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Design and implementation of a preload electronics architecture for a MEMS accelerometer
… A feedback control loop is devised using a novel preload architecture, compensating the proof mass of the sensor and providing an accurate acceleration measurement. This architecture is compared to alternative methods of linearizing the control loop. The electronics system is divided into analog …
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The Effect of Preload Reduction on Parameters to Evaluate Left Ventricular Diastolic Function
… pressure. This index has been reported as a preload independent parameter in experimental canine model. The impact of preload on this index, however, has not been studied in human. The purpose of this study was to evaluate the effect of the hemodialysis related preload reduction on …
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Design of an STM and EPL control system and linear actuator preload diaphragm
… a micron stepper motor, precision mounts, a preload diaphragm, and an advanced control system capable of automated EPL and STM verification. Steady electron tunneling is first demonstrated, followed by STM imaging functionality. However, high-speed, high-accuracy EPL machining techniques are …
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The Variability of Strains in Bolts and the Effect on Preload in Jointed Structure
… amount of uncertainty in the resulting bolt preload. With the inability to determine the preload in bolted structures precisely, overdesign is necessary for bolts to meet safety requirements and prevent jointed structures from looseness failure. A series of comparative experiments are …
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Development of kinematic coupling preload guidelines through design and testing of an adjustable micromanufacturing fixture
In the growing field of non-lithographic micromanufacturing, the ability to properly align a workpiece to a machine limits the attainable tolerances in micro-electro-mechanical-systems (MEMS) prototyping. This limit has created the need for a standard adjustable base for implementation into …
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Design and fabrication of a device to characterize spindle performance as a function of bearing preload
… lathe spindles as a function of spindle bearing preload. The apparatus will be used to assist undergraduate students enrolled in 2.72 in understanding mechanical design concepts. In order to assess spindle performance, the apparatus measures the radial stiffness, radial error motion, and running …
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Settlement Analyses of Grade Supported Tanks Constructed with the Use of Prefabricated Wick Drains and an Earth Preload
… supported tanks constructed under an extensive preload and instrumentation program. Settlement estimation methods were performed and compared to field instrumentation data taken at the project sites. Three project sites were selected for this study. The geotechnical investigations were performed …
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Design and engineering of low-cost centimeter-scale repeatable and accurate kinematic fixtures for nanomanufacturing equipment using magnetic preload and potting
… design techniques to optimize the magnetic preload required to achieve repeatability on the order of 100 nanometers. The fixture achieves accuracy to within one micrometer via an adjustable interface composed of UV curing adhesive between the mating kinematic coupling components. The fixture …
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Structural Behaviour of Concrete Filled Steel Tubes With High Strength Materials.
… In addition, this study investigated preload effect on the resistance of CFST columns. Design formulae were proposed to consider the preload effect. It was found that a significant reduction in ultimate resistance can be produced under high preload. In conclusion, this study has made a …
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Fretting Fatigue Characterization of Steel Bolted Connections
… fatigue life of the bolted connections, bolt preload and surface finish are considered primary. The main objective of this thesis was to characterize the fretting fatigue failure behaviour of slip-critical bolted connections made of high strength steel subjected to different axial stress …
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A self-regulation analysis of dietary restraint
… and half of the subjects drank a milkshake preload. The comparison standards manipulation influenced the eating behavior of restrained subjects in the direction predicted by the model. The model also proved useful in describing the processes underlying consumption for the two subject groups. …
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Motor simulation and parameter identification in a reciprocating mechanism
… of mass, damping, spring stiffness, and preload force of the mechanism. The time domain data (e.g. the motor net input torque, the mechanism load torque, the angular velocity, and angular acceleration, etc.) of the mechanism from a simulation can be related through the use of Newton’s …
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Towards force-correlated ultrasound volume elastography
… load cell which measured the sonographer-applied preload. The device was used to demonstrate the strong preload dependence of elasticity in ex-vivo bovine liver, illustrating the importance of accounting for preload when using elastography to assess tissue health. Finally, this device enables the …
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Ground improvement using vacuum preloading together with prefabricated vertical drains
The use of vacuum preloading as an alternative to or in combination with fill preloading has become widely acceptable throughout the world. A number of successful case histories of vacuum preloading using different techniques have been reported in the literature. The vacuum pressure, which is …
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Mechanisms by which cardiac resynchronisation therapy improves cardiac performance in heart failure
… due to the relief of external constraint and preload recruitment. However, in those patients with evidence of electrical dyssynchrony and a broad QRS duration, a significant haemodynamic benefit was derived from an enhancement in left ventricular contractility, presumably as a result of a …
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Testing and Modeling of Shock Mitigating Seats for High Speed Craft
… test input the occupant weight and suspension preload is varied and the response is analyzed to find changes in acceleration, which is representative of the changes in force and displacement. By representing the seat as a based-excitation two-degree-of-freedom system, we develop the equations …
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Hemodynamic outcomes of weaning intraaortic balloon counterpulsation in heart failure
… indices reflecting contractility, afterload, and preload were measured during the final one-minute for each stage of the weaning protocol. Descriptive statistics were used to determine the patterns of measurements over the nine stages for each group. To determine main effects and interaction …
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Elements for the design of precision machine tools and their application to a prototype 450mm Si-wafer grinder
… precision machines. In particular, a ball screw preloaded height adjustable kinematic coupling and a magnetically preloaded hydrostatic thrust bearing were designed and built. The adjustable kinematic coupling allows for up to 8mm of vertical height adjust and 7N/nm stiffness at 26 kN preload. By …
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