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 56 for “"Four Bar"”.
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Adaptive control of a four-bar linkage
… controllers are developed and applied to Four-bar linkage velocity control to reduce the input link velocity fluctuations without compromising the control system velocity transient response. The successful control techniques use the known mechanism kinematics and the mechanism input link …
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Design of plane four-bar function generators by curve matching
This thesis presents two methods for designing four-bar function generators by matching a plot of the desired function with curves and charts derived from the computer solution of the displacement equation relating the input and output angles of the four-bar linkage. A series of curves and charts …
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Kinematics of beam flexure four-bar linkages with applications in a compound bow
… important aspects. First, one grounded link of a four-bar linkage is replaced by a cantilevered beam in flexure to produce a force generating mechanism. Second, the synthesis method presented here allows the generation of these mechanisms in closed form for prescribed force generation. A compound …
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Design analysis of the four-bar Jaipur-Stanford prosthetic knee for Developing countries
… Knee, a novel prosthetic knee incorporating a four-bar design, was born. This knee design has become widely popular amongst amputees and was named one of the top 50 best inventions in 2009 by Time Magazine. However, despite the popularity and widespread media coverage of the knee's development, …
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Optimized Sythesis of a Force Generating Planar Four-Bar Mechanism Including Dynamic Effects
… thesis presents a technique for designing planar four-bar linkages by coupling optimization, dynamics and kinematics. This synthesis technique gives the designer the ability to design linkages having a desired resistance profiles under an assumed motion profile. The design approach presented in …
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Kinematic synthesis of planar four bar and geared five bar mechanisms with structural constraints
… the classical kinematic analysis of a planar four-bar and geared five-bar motion generation with three structural design constraints. These constraints consider driving link static torque, deflection of the crank and buckling of the follower for a given rigid-body load or constant external …
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Modularizing transformations : a goal-oriented design tool of a modular four-bar linkage mechanism
Recent advances in materials science and manufacturing technology have not only provided promising opportunities for industrial and product design but have also catalyzed the emerging areas of transformable material design. This field of transformable material design is a multidisciplinary subject …
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The synthesis of four-bar linkage coupler curves using derivatives of the radius of curvature
Procedures for the synthesis of four-bar kinematic linkages with approximate portions of their coupler point curves specified are developed. The necessary equations are derived and computer programs using these equations which have been integrated into a complete synthesis procedure are set forth. …
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Synthesis of mechanisms for function, path, and motion generation using invariant characterization, storage and search methods
… work presents an approach for the synthesis of four-bar planar mechanisms for function, path, and motion generation based upon the use of invariant descriptors and local database generation and search methods;Transformation and descriptor methods are used to characterize the motion of four-bar …
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Burmester curve and numerical motion generation of Grashof mechanisms with perimeter and transmission angle optimization in MathCAD
An infinite number of planar four-bar mechanism solutions exist for a series of prescribed rigid-body positions. Given a set of Burmester curves or numerically-generated fixed and moving pivot curves, sorting through the limitless number of possible mechanism solutions to find one that ensures full …
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Kinematic Analysis Of A Two Body Articulated Robotic Vehicle
… kinematic analysis of an articulated twin body, four-wheel, robotic vehicle is presented. Polaris, a research platform and contending robotic vehicle in the Intelligent Ground Vehicle Competition (IGVC) at Virginia Tech, was redesigned in 2006 to improve the mobility of the vehicle by …
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Development of a low-cost high-impact resistant compliant myoelectric prosthetic hand
… the design and evaluation of a compliant four-bar linkage mechanism that makes the fingers of a prosthetic hand more impact resistant and the integration of electromyographic (EMG) motor control and sensory substitution. The mechanism of our design replaces both the rigid input and coupler …
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Kinematic synthesis of a well service machine
… and expensive, a solution using an appropriate four-bar mechanism for this purpose was contemplated, using Burmester theory and the four-position synthesis method.;The angles and distance of the four positions were calculated and the data obtained was specified as input for the synthesis of the …
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A gait generation mechanism for leg rehabilitation therapy
… thesis focuses on the dimensional synthesis of a four-bar linkage to reproduce the desired ankle trajectory in the sagittal plane. The data of sagittal flexion/extension at the hip and knee joints from healthy people are used to define the desired ankle trajectory during normal gait cycle. A path …
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A PC implemented kinematic synthesis system for planar linkages
… a PC implemented kinematic synthesis system for four-bar and six-bar planar linkages using Turbo Pascal. CYPRUS is an interactive program that calculates and displays graphically the designed four-bar and six-bar linkages. This package can be used for three and four position synthesis of path …
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Beta-prototype of a rickshaw suspension system
… rickshaws more comfortable for the drivers. A four bar linkage with a rising rate spring was chosen as the design. An unconventional material-tire rubber-was used as the spring material because it is inexpensive, requires limited tooling, and is in vast supply near The Rickshaw Bank's factory …
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Métodos de síntese em mecanismos
A new form for the equation of four-bar coupler curve is presented in which all coefficients of the 6th degree equation are shown. For the planar linkage the trational methods are shown anda new method is developed based on rolling-curve and instant center properties. Methods are also summarized …
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