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 83 for “"Normal Force"”.
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A modular fingertip design for normal force feedback control of a 3-fingered dextrous robotic hand
… hand mechanics over the past decade, fingertip force remains predominantly controlled by flexor cable tension and joint position. A modular fingertip normal force sensor is developed here from basic semiconducting elastomer devices. Construction techniques are defined to shape standard Interlink …
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Optimizing Snake Locomotion on a Plane: A Variational and Analytical Framework for Friction and Normal Force Modulation
… periodic deformations and utilizing resistive force theory (RFT), we derive variational optimization conditions for minimizing the mechanical cost of transport (mCoT) and maximizing forward displacement. The results show that sawtooth-shaped body waveforms—characterized by alternating constant …
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Human Interaction with Various Elliptical Constraints
… ellipse was based on estimates of the zero-force trajectory during circular crank-turning; the anti-aligned ellipse was a rotated version of the aligned ellipse. Subjects were given visual feedback on their velocity to decrease variability across trials, constraint shapes, and subjects. The …
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Characterizing the Frictional Interface in Friction Stir Welding
… plate. The ranges of temperature, velocity, and normal force used in this method are 100–600°C, 0.38–2.0 m/s (75–400) surface feet per minute (SFM)), and 450–2700 N (100–600 lbf), respectively. Data are gathered at different parameter level combinations to provide enough data to create an …
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Modeling and validation of a subscale aerobatic aircraft configuration in spin
… of a new analytical model for calculating the forces on a stalled spinning wing, and validation of that model through wind tunnel tests. Significantly, these results are combined to form a new code, SpinSim, which assists with the six-degree-of-freedom (6DOF) simulation of the aerodynamics and …
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Human physical interaction with a circular constraint
… speed, coefficient of variation of speed, mean normal force, and standard deviation of normal force. We hypothesized that subjects should perform the best at slow speeds where the effect of feedback delays, inertial dynamics, and muscle noise decrease. Notably, subjects became more variable at …
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An experimental and numerical investigation of the performance of compressor cascades with stalled flow
… cascade performance as indicated by the blade normal force and total pressure loss were evaluated. The investigation consisted of both experimental and numerical phases. The effects of stagger, angle of attack and Reynolds number were investigated experimentally using a two-dimensional cascade …
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Investigation of the Processing History during Additive Friction Stir Deposition using In-process Monitoring Techniques
… of i) the temperature evolution, ii) the force evolution, and iii) the interfacial contact state between the tool and deposited material. Empirical trends are established for the peak temperature with respect to the processing conditions for Cu and Al-Mg-Si, but a key difference is noted …
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Simulation and modeling of magnetically-assisted impaction coating (MAIC) process for dry particle coating
… to coat the particles. The velocities and the normal force attained by the non-magnetic particles are estimated and compared with the same necessary for coating process. The deformation of the virtual guest particles are estimated from the normal force of collision of host particles and the van …
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A Reluctance Actuator Gap Disturbance Testbed
… three single-axis load cells that can measure a normal force, a roll torque and a pitch torque. We keep track of the orientation and position of the stage by using capacitance probes. The gap disturbance is imparted with three piezos capable of a stroke of 15[mu]m.We have also fabricated several …
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Development of a novel micropipette aspiration-based force sensing technique to measure single cell sliding friction
… the cells’ curvature. The presence of tangential force component (or the sliding friction) and the recruitments of auxiliary stress-dependent ligands at the adhesion site mean conventional cell detachment model is not adequate to explain the rupture mechanics of a sliding cell. Thus, we propose an …
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Investigations into Flange Surface Friction Effects on Shear Stud Load Transfer in Composite Bridge Girders
… used to measure stud demands while controlled normal forces are applied to each slab to allow controlled changes in flange friction force during testing. A total of nine experimental tests are conducted. The analytical study involves 32 finite element simulations of pushout geometries having …
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Theoretical and Experimental Atomic Force Microscopy Investigations of Staphylococcus aureus
… serotype 5 or 8 capsular polysaccharides. Atomic force microscopy (AFM) was used to investigate three serotypically different S. aureus strains, two of which express capsular polysaccharides, in air and phosphate buffered saline. Adhesion and compliance were determined through normal force …
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Understanding the friction between human fingers and contacting surfaces
… conditions. Tests examined the effect of normal force, the area of contact, the effect of triangular and rectangular cross-section ridges and the effect of moisture. The tests found that when a finger is contacting a nominally flat surface, the friction force increases with normal force, …
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Analysis and Control of Rate and Uniformity for Granular Fertilizer Application Systems
… is kept in contact with them under a controlled normal force. The measured torque on the disc is then a measure for the friction coefficient. Data for the same fertilizer materials Ammonium Nitrate and Potassium Chloride indicated that the rheometer is not a good instrument to obtain friction …
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Impact of rim weight and torque in discus performance
… the ability of an athlete to apply the proper forces and torques to the discus. This paper looks at measuring the ability of the athlete to create spin on the discus by applying torque in the throwing process. The results from the experiment described in this paper were inconclusive, though …
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Modeling Macro-scale Clay Behavior at Micro-scale Clay Particle Interfaces
… in consolidation tests experience shear and normal forces at the inter-particle level due to force applied to the soil at the macro-scale. These shear and normal forces cause the particles to slide at the micro-scale and produce macro-scale changes in soil volume and shape. By considering the …
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Surface textures and non-Newtonian fluids for decreased friction in full film lubrication
… a custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction due to the surface textures. This work shows that symmetry must be broken in order to produce normal forces with surface textures which are caused by viscous effects for gap based Reynolds …
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Estimation of Disturbance Inputs to a Tire Coupled Quarter-car Suspension Test Rig
… input to the tire and an external disturbance force, representing handling and aerodynamic forces, acting on the sprung mass of a quarter-car suspension test rig was generated. This information is intended for use in active control methods applied to vehicle suspensions. This estimate is …
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Propellers in yawed flow at low speeds
… velocity. Propeller torque, thrust, and the normal force produced from the sideslip angle were all measured. It was observed that at small angles of yaw, the variation in performance was minimal, yet a dramatic increase was witnessed at angles greater than 15 deg.
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