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.
Results
Showing 1 to 19 of 19 for “"Hydraulic actuators"”.
-
Force control of electro-hydraulic actuators in an underwater fish-like vehicle
Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
-
Mechanical development of an actuation system for a parabolic solar trough collector
… my personal contribution to the development of a hydraulic-based actuation system for a solar trough collector. The goal of this project was to design the actuation system using hydraulic actuators for a four meter solar collector prototype in Pittsfield, New Hampshire. After considering several …
-
Three-dimensional computerized model of an elastic robotic arm
… elastic robotic arm, controlled by two hydraulic actuators, was created. The software simulation developed in the present work was highly interactive with the user. The user is able to move the different links, change parameters, and alter dynamic applied forces. The kinematics were …
-
Kinematic and dynamic calibration of hydraulically actuated manipulators
… mining, and forestry make use of heavy-duty hydraulic machinery with manipulators usually controlled manually by expert human operators. The hand controls that operate most articulated machines today do not take advantage of recent developments in robotics and control technology. There are …
-
Biomimetic Bi-Pedal Humanoid: Design, Actuation, and Control Implementation with Focus on Robotic Legs
… data to devise performance parameters and select actuators. The developed system was able to achieve comparable ROM, size, weight, and torque to a six-foot tall human. Position and zero-moment point sensors were integrated for use in balancing, and a control architecture was developed. A model of …
-
Development of an integrated tracking control algorithm and a test platform for autonomous excavation
… PI controller was devised to control the hydraulic actuators of the boom, arm, and bucket links of the excavator. To compensate for the ground resistive forces, an impedance controller was designed. Finally, contour compensation was considered to generate an optimal path of the bucket tip …
-
Experimental Evaluation of a Trailing-Arm Suspension for Heavy Trucks
… For actuation of the vehicle suspension, hydraulic actuators are used in the kinematics tests in a quasi-dynamic manner. For the dynamic tests, the vehicle is excited using two hydrodynamic actuators. A collection of forces, displacements, velocities, and accelerations are measured during …
-
More Electric Systems Architecture Effect on Business Jet Performance
… proposed more-electric architecture replaces the hydraulic actuators for the flight controls with electro-hydrostatic and electro-mechanical actuators; the engine off-takes (bleed) for cabin pressurization and wing de-icing with electrically driven compressors and electrical heating mats, …
-
Improved seismic isolation for the Laser Interferometer Gravitational Wave Observatory with hydraulic external pre-isolator system
… tanks was developed. The system is called the Hydraulic External Pre-Isolator (HEPI), which uses position and geophone sensors, ground seismometers, and hydraulic actuators to suppress payload motion. HEPI prototype was designed and tested in 2003 and installed on site in 2004. The first stage …
-
Development of a microfabricated turbine-driven air bearing rig
… bearings are useful for miniature fluidic/hydraulic actuators. The micro-rotating machinery will open new opportunities for fabricating micro valves, pumps, micro-coolers, and micro-propulsion devices.
-
Effects of Frame Design and Cab Suspension on the Ride Quality of Heavy Trucks
… forward drive (second) axle using two 5500 lb hydraulic actuators with displacement control. The steering (first) axle was left in contact with the ground (through the tires) and the rear drive (third) axle was strapped to the truck's frame and acted solely as dead weight. The actuators were …
-
Investigation of Acceleration Dependent Nonlinear Lubricated Friction in Hydraulic Actuation Systems
Lubricated friction issues are central to all hydraulic actuation systems undergoing motion and any in-depth understanding of the nature of lubricated friction will advance future component design. The classic friction models of hydraulic actuation systems under steady state conditions and their …
-
Multi-axial Active Isolation for Seismic Protection of Buildings
… response control, three, custom-manufactured actuators are employed to mitigate both in-plane and out-of-plane responses. To obtain a high-fidelity model of the active isolation systems, a hybrid identification approach is used which combines the advantages of the lumped mass model and …
-
Railroad Tie Lateral Resistance on Open Deck Plate Girder Bridges
… bridge with a smooth-top steel plate girder, and hydraulic actuators to apply both vertical and horizontal load to a railroad tie specimen. The three main contributions to lateral resistance on open-deck bridges were identified as friction resistance between tie and girder due to vertical load …
-
Design and performance evaluation of a rotary flow control valve for independent metering hydraulics.
… This is partly attributed to inefficient power hydraulic systems used to drive these machines’ tools or instruments. A relatively recent idea of an independent metering technology has become a major topics in improving efficiency, reducing fuel consumption and saving energy. Current research and …
-
Multi-axial real-time hybrid simulation framework for testing nonlinear structure systems with multiple boundary interfaces
… and physical substructures are imposed by servo-hydraulic actuators, with the responses measured by load cells and displacement transducers. Traditionally, these actuators impose boundary condition displacements at slow speeds, while damping and inertial components for the physical specimen are …
-
Observer Design for Non-Monotonic Nonlinear Systems and Interesting Contemporary Applications
… this finding. Position estimation in electro-hydraulic actuators using non-contacting magnetic sensors is another subject that is considered. Magnetic measurements in this application are all non-monotonic, hence based on the theoretical findings of this dissertation it is clear that more than …
-
Uv-liga Compatible Electroformed Nano-structured Materials For Micro Mechanical Systems
… been designed, fabricated and tested for robust hydraulic actuators. The first such micro valve developed employs nanostructured nickel as the valve flap and single-crystal silicon as the substrates to house inlet and outlet channels. The Nano-structured nickel valve flap was fabricated using the …