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 24 for “"mechanical advantage"”.
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Design and testing of a nonlinear mechanical advantage demonstration mechanism
A four-bar linkage with prescribed nonlinear mechanical advantage has been synthesized and tested. This tool is intended to in1prove cognition of linkage synthesis theory through interactive demonstrations and has both industrial and educational applications. Industrial applications include use as …
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Optimal Synthesis of Planar Five-link Mechanisms for the Production of Nonlinear Mechanical Advantage
… five-link mechanisms that produce a desired mechanical advantage function over a specified path. Since a five-bar linkage has two degrees of freedom, small deviations from the specified path are possible without significantly altering the mechanical advantage function. The research shows one …
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Design of Linear Series Elastic Actuators for a Humanoid Robot
… a crank arm, tend to suffer from a loss of mechanical advantage toward the ends of its limited range of motion. To augment the range of motion and mechanical advantage profile on THOR, an inverted Hoeken's linkage straight line mechanism is paired with a linear SEA at the hip and knee pitch …
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Pelvic Shape, Hip Abductor Mechanics and Locomotor Energetics in Extinct Hominins and Modern Humans
… of pelvic width are correlated with relevant mechanical dimensions during locomotion, and how hip abductor mechanics may influence locomotor cost. Twenty-seven individuals participated in biomechanics testing, including kinematics, force plate and oxygen consumption trials. In addition, …
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Elliptical Rolling Link Toggle Mechanisms for Passive Force Closures with Self-Adjustment
… mechanisms with oscillatory motion and high mechanical advantage. As large compressive loads are characteristic of such mechanisms, stress conditions are identified and principles for joint stability with variable, precision outputs are discussed. Finally, application is made to …
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Design and development of a modular test machine for students in 2.001
The Mechanical Engineering course, Mechanics and Materials I (2.001), focuses on providing an introduction to the mechanics of solids with applications to science and engineering. While the current curriculum teaches in-depth theory, it can be improved in applicable knowledge. The focus of this …
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Optimal synthesis of force-generating planar four-link mechanisms
… targets linkage applications for which the mechanical advantage is prescribed but the position function is not. The advantage of this approach is that emphasis is placed on the force-generating properties of the linkage and not the output positions of the mechanism. Closed-form synthesis of …
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A Tale of Two Studies: A Biomechanical Comparison of Extrapelvic and Intrapelvic Fixation for Acetabular Fractures among the Elderly and a Comparison of Dosage Accuracy and Precision for Traditional and Incremental Syringes
… and intrapelvic providing, theoretically, a mechanical advantage. 10 fractured and fixated cadaveric pelvises underwent biomechanical testing to compare the two methods. On average, pelves with intrapelvic plates performed better for all test metrics with statistical significance (p < 0.05) …
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Design, construction and testing of an innovative mechanism for manual wheelchair propulsion
… that give the manual wheelchair users a mechanical advantage, and allow them to operate a standard wheelchair with less effort and muscle strain are being developed.;An innovative mechanism has been conceived, designed, built, and tested. It allows the user to propel a standard wheelchair …
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Kinematic synthesis of a well service machine
… Mechanism configurations were evaluated and the mechanical advantage was calculated to select the better design.;Results suggest that the method of four-position synthesis can used to design an appropriate mechanism to place the guide valve on the blowout preventer.
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Kinematics of beam flexure four-bar linkages with applications in a compound bow
… an example. This design relies on the non-linear mechanical advantage of the four-bar linkage and the bow mechanics to provide a resistance curve that is more compatible with the human strength curve. In addition, by modifying the bow kinematics, more potential energy can be stored, and thus …
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Design and construction of a practical and portable household lifting-aid for the physically impaired
… that could lift a max of 200 lbs with a 6:1 mechanical advantage. Further discussion explores the possibility of mass production of said device.
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Wrapping CAM mechanisms
… of a cam to produce a desired displacement or mechanical advantage. These original closed-form techniques are developed from the basic laws of conjugate geometry. While wrapping cams are far less common than cams that generate a specified follower displacement functions, applications exist in …
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Material characterization of Guadua bamboo and the environmental feasibility of structural bamboo products
… bamboo into a structural composite can improve mechanical performance, durability, and joining, which can open up new structural applications and design possibilities as well as remove the stigma that bamboo is the "poor man's timber". This study aims to characterize the radial and longitudinal …
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Synthesis of planar four-link mechanisms for force generation
… it presents the development and use of inverse-mechanical-advantage sensitivity as an evaluation and design tool. The mathematical derivation of a novel synthesis technique is presented in full detail. Also presented is a complete and robust design method for force-generating linkages that has …
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Método dimensional óptimo de sistemas multicuerpo con restricciones dinámicas: aplicación al diseño de mecanismos planos
… main merit indexes -ratio of angular velocities, mechanical advantage and transmission angle- are developed. These expressions are subsequently used to optimise the dynamic behaviour of planar mechanisms. The described method enables the simultaneous optimisation of the kinematic and dynamic …
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The development of stage machinery in the nineteenth century British theatre : a study of physical and documentary evidence
… one of the few disciplines in the field of mechanical engineering which have virtually never relied upon new discoveries in technology for their advancement. Instead it has always lagged behind, perhaps modifying, certainly adapting, existing techniques. This study aims to examine the …
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An analysis of buckling in spherical shells and its design implications for hopper poppers
… mechanism designed for a blaster, which uses the mechanical advantage of a lever arm to invert a popper. Another is a design for new hopper poppers which could take less force to invert than a normal hopper popper, but store the same elastic potential energy.
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Design and Optimization of a Handle Robot for Providing Bodily Support to Elderly Persons
… A cost function with a trade-off between mechanical advantage and manipulability of the user’s arm was optimized in terms of the location of the handlebar relative to the user. The methodology requires only a sagittal plane video of the elderly user performing the postural change, and thus …
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Development and Characterization of a Mechanically Prestressed Piezoelectric Composite
… the increased performance derived from the mechanical advantage, and enhanced domain rotation, found in prestressed unimorph designs. Prestressed devices, like Thunder® and LIPCA, have been shown well suited for a number of applications; however, the price associated with these devices can …
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