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 11 of 11 for “"hydraulic cylinder"”.
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Piezohydraulic Actuator Design and Modeling Using a Lumped-Parameter Approach
The concept of piezohydraulic actuation is to transfer the reciprocal small stroke displacement of piezoceramics into unidirectional motion by frequency rectification through a hydraulic fluid. It takes advantage of the high force capabilities that piezoelectric materials have and couples it with …
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Designing a high-efficiency hydrostatic bicycle transmission
… the importance of minimizing side-loading on hydraulic cylinder piston-rods during low-speed, low-pressure operation. The research is used to suggest several design features which may aid in continued attempts to develop a highly efficient hydrostatic transmission.
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Design and analysis of hydraulically driven actuation system For a parabolic solar trough
… Katarina Popovic's contribution to the design of hydraulic cylinder actuation system for day to day solar trough sun tracking, a semester long project within 2.752 Development of Mechanical Products class. The primary goal of this project was to design a robust mechanical system while reducing the …
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Energy management of vehicle collision forces on automotive seats
… vehicles by at least 50%. The EMS is a hydraulic damper consisting of a control valve, a pressure operated directional control valve, and a hydraulic cylinder. The system operates entirely upon the forces experienced in the collision and dissipates the energy through a 30° rotation of …
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Development and Analysis of the Lumped Parameter Model of a Piezo-Hydraulic Actuator
… systems, such as a mechanical, electrical, hydraulic, pneumatic, and/or thermal, among others, are integrated in order to combine certain aspects of each system, and achieve a better and more efficient performance under certain operating conditions. The concept of piezohydraulic actuation …
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A hydraulic damping approach to variable stroke tree shaker design
… stroke feature was attained with the use of a hydraulic cylinder and metering valve in the boom of the shaker with the cylinder acting as a variable rate dashpot. The design was tested in the laboratory under varying conditions of effective limb mass and shaking frequency. For comparison, a …
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Multidisciplinary Design Optimization of Nose Landing Gears with Two Degrees of Freedom Considering Out of Plane Loading and Actuator Performance
… nose landing gears with two DOF considering hydraulic cylinder performance and out-of-plane load cases. This thesis presents an MDO methodology for simultaneous structural and multi-body dynamic optimization of retractable nose landing gear main fitting, side brace, and lock link assemblies, …
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The effect of overloading on reliability of wheel loader structural components
… examine the effect of overloading the bucket on hydraulic pressures in the hoist cylinders (used as a proxy for forces on a wheel loader); and 3) investigate the effect of overloading the bucket on the reliability of structural components of a wheel loader.</p><p>To achieve these objectives, the …
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A Tractor Mounted Device Used for Comparison of In-Situ Soil Bearing Capacity Between Two Tillage Regimes
… tests and a probe for cone penetrometer tests. A hydraulic cylinder powered by the tractor's auxiliary hydraulic circuit forced the footing or cone penetrometer into the soil. Load cells were used to measure bearing plate and cone penetrometer loads. A linear potentiometer was used to measure …
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Fault monitoring in hydraulic systems using unscented Kalman filter
Condition monitoring of hydraulic systems is an area that has grown substantially in the last few decades. This thesis presents a scheme that automatically generates the fault symptoms by on-line processing of raw sensor data from a real test rig. The main purposes of implementing condition …
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Štípací zařízení pro smykem řízený nakladač
Cieľom tejto bakalárskej práce je stručná, kritická rešerš typov štiepačiek pre šmykom riadený nakladač na trhu a vytvorenie vlastného koncepčného návrhu pre zadané parametre. Práca je rozdelená do piatich kapitol. Prvá kapitola sa sústredí na rešerš, v druhej kapitole je popísaný vlastný návrh a v …