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 46 for “"Constant-Force"”.
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Development and Design of Constant-Force Mechanisms
This thesis adds to the knowledge base of constant-force mechanisms (CFMs). It begins by reviewing past work done in the area of CFMs and then develops new nondimensionalized parameters that are used to simplify the calculations required to design a CFM. Comparison techniques are then developed …
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Assembly of interference fits by impact and constant force methods
Thesis. 1979. M.S. cn--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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An Optimization-Based Framework for Designing Robust Cam-Based Constant-Force Compliant Mechanisms
Constant-force mechanisms are mechanical devices that provide a near-constant output force over a prescribed deflection range. This thesis develops various optimization-based methods for designing robust constant-force mechanisms. The configuration of the mechanisms that are the focus of this …
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A Closed-Form Dynamic Model of the Compliant Constant-Force Mechanism Using the Pseudo-Rigid-Body Model
… dynamic model is derived for the compliant constant-force mechanism, based on the pseudo-rigid-body model simplification of the device. The compliant constant-force mechanism is a slider mechanism incorporating large-deflection beams, which outputs near-constant-force across the range of its …
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INTEGRATION OF INTRA-AUDITORY MODALITIES FOR THE ENHANCEMENT OF MOTOR PERFORMANCE AND COORDINATION IN A CONSTANT FORCE PRODUCTION TASK
… for the control of multiple fingers during constant force production tasks, specifically regarding how the CNS utilizes multiple sources in auditory feedback, how the CNS deals with uncertainty in auditory feedback, and how the CNS adapts or learns a motor task using auditory feedback. The …
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Design of a rodent dynamometer
… on muscle injury. However, the effect of constant force on muscle injury in animals has not yet been studied.;A computer-controlled dynamometer was designed which could perform isometric, isovelocity, and isotonic testing on both male and female rats. A mechanical device was designed to …
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Simulation and Design of Two Tool Support Arm Exoskeletons with Gravity Compensation
… hand. Using a pantograph linkage allows for a constant force to be created at the hand in any orientation when a constant vertical force is supplied to the other side of the pantograph. We present several topologies and analyze them based on feasibility of manufacture and ability to provide a …
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Quantitative biological studies at cellular and sub-cellular level
… tethers were extracted simultaneously under constant force transduced to eukaryotic cells through magnetic beads attached to their membranes. The tethers were characterized in terms of viscoelastic parameters. The contribution of the actin cytoskeleton in the process of tether formation was …
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The reliability of an isometric test based on constant perception of effort
… a maximal voluntary contraction and a 2 min constant force contraction at both the start and end of the study. Between pre and post testing all participants completed a 2 min constant perceived exertion contraction once a day for 4 days. Intra-class correlation coefficient (R=O.949) and …
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The structural determinants of media contagion
… two channels: externally, as applied by a constant force such as the mass media, and internally through socio-structural means. Sitting between our traditional notions of mass media and the public, weblogs problematize this classical theory of mass media influence. This thesis aims to …
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The Role of Instantaneous Forces in Particle Movement
… This work attempts to show that more than simple force balances are needed to determine the point at which a particle will move. Turbulent fluctuations in velocity seem to have an effect of particle entrainment. The fluctuations in velocity can be several times greater than their time averaged …
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Passivity-Based adaptive bilateral teleoperation control for uncertain manipulators without jerk measurements
… desired translational velocity and interaction force are provided to the master robot by the user, while the object is manipulated with a bounded constant force by the slave robots. Firstly, we develop an adaptive kinematic-based control scheme based on a composite adaptation law to solve the …
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Molecular Dynamics Simulation of Force-Induced Protein Domain Unfolding
Force-induced protein domain unfolding has been studied by steered molecular dynamics simulations (SMD). Two pulling protocols were adopted in the simulation. SMD with constant velocity pulling protocol qualitatively reproduced atomic force microscopy (AFM) observation that immunoglobulin and …
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Squat exercise biomechanics during short-radius centrifugation
… at speeds up to 30 revolutions per minute. Constant force springs provided additional resistive force up to 25% of body weight. Dependent measure included the three-dimensional position of the left and right knee, left and right foot reaction forces, and muscle activity. We investigated the …
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Handheld force-controlled ultrasound probe
An hand-held force controlled ultrasound probe has been developed. The controller maintains a prescribed contact force between the probe and a patient's body. The device will enhance the diagnostic capability of free-hand elastography, swept-force compound imaging, and make it easier for a …
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Stochastic dynamics of adhesion clusters under force
… adhesion sites are usually subject to physical forces. In recent years, the influence of such forces on the stability of cellular adhesion clusters was increasingly investigated. In particular, experimental methods that were originally designed for the investigation of single bond rupture under …
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Effects of Surface Condition on the Fatigue Behavior of CFRP-to-Steel Joints
… to evaluate the fatigue behavior under constant force amplitudes. Roughness on the steel substrate was achieved by ½ in (13 mm) diameter pits approximately 1/8 in (3.18 mm) deep to simulate an irregular surface. The results show that the surface condition has marginal influence on the …
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Force-dependent changes in alpha-catenin conformation
… crucial intercellular adhesions that transduce force fluctuations at junctions to activate signals that reinforce stressed intercellular contacts. α-Catenin is an identified force sensor within cadherin complexes. Mechanical force regulates binding of α-catenin to the actin-binding protein …
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Redesign of a human powered battery charger for use in Mali
… motion to move a device produces power through a constant force spring, a small motor. A voltage regulator safely charges the battery using the voltage output of the motor. The rowing motion requires a number of moving parts and expensive components and although the complex motion combines the …
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MOBILITY ANALYSIS AND TOPOLOGY SYNTHESIS OF COMPLIANT MECHANISM USING COMPLIANCE NUMBER AND PSEUDO-RIGID-BODY MODEL (PRBM)
… method is used to develop potential concepts for constant-force-based surgical clamps and retractors to minimize tissue trauma during surgical procedures, caused by the application of excessive tool-tissue interaction forces"--Abstract, p. iii</p>
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