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 15 of 15 for “"Torque Production"”.
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The investigation of valve operators' torque production capabilities and optimal handwheel height, angle, and opening technique
… and trunk muscles; and (2) determine whether the torque setting (15 Nm and 30 Nm) of the valve affects the preferred valve-opening method. Four methods were evaluated, including using bare hands (BH), conventional wrench-restricted (CW-R, assumes presence of obstructions), conventional …
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Permanent Magnet Synchronous Motors: Nonlinear Dynamic Modeling, Hardware Characterization, and High-Bandwidth Torque Control for Applications in Dynamic Robotics
… locomotion in legged robots depend on accurate torque production for matching real-life performance with simulated performance. To achieve accurate torque production, actuators must run high-bandwidth, low-level torque control. Developing high performance low-level controllers requires accurate …
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Neuromuscular Dysfunction as a Novel Indicator for Alzheimer's Disease and Response to Intervention in the 5xFAD Model
… by impaired nerve- stimulated muscle torque production and sciatic nerve compound action potential. Additionally, skeletal muscle in 5xFAD mice showed sex-dependent altered adaptive responses to exercise training without cognitive impairment. Given these findings, we hypothesized that …
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Nitrate supplementation does not alter the V̇O2p SC-muscle fatigue relationship in recreationally active men
… by electrically stimulated quadriceps muscle torque production. NO3- supplementation had no effect on the development of the V̇O2p SC amplitude or muscle fatigue or the linear relationship between the two variables (slope = 6.85 (BRJ) vs. 8.34 (PLAC) (mL/min)/(10/50 Hz ratio; P = 0.628).
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Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor
… its region of operation and the underlying torque production of the motor. The selection of operating region is followed by a both linear and nonlinear electrical modeling of the motor and the design of current controllers for the PMSRM. The electromechanical model of the motor is …
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ENHANCING EXERCISE PERFORMANCE THROUGH ISCHAEMIC PRECONDITIONING
… negate eccentric exercise-induced reductions in torque production. Eleven recreationally trained males completed 200 repetitions of maximal eccentric contractions when preceded by IPC or SHAM performed in a randomized order, separated by a 9-week washout period. Muscle function tests were …
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Brushless doubly-fed reluctance machine drive for turbo-electric distributed propulsion systems
… permanent magnets. This thesis investigates the torque production in BDFRM, discusses machine modeling and drive control architecture, and reports on an initial sizing of a 1.5 MW motor. However, the BDFRM has inherently poor torque density because of machine saturation, even at low …
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Methodological developments in the assessment of physiological responses to arm crank ergometry
… kinetics; 3) the assessment of external power production during sprint arm crank ergometry, and 4) the design and implementation of novel equipment configurations and research designs. During preliminary testing we demonstrated that the selection of an imposed crank rate was an important …
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Relative contribution of the internal rotators of the shoulder to speed of the fastball in college baseball pitchers
… pitchers were tested for upper extremity peak torque production on the Cybex II Isokinetic Dynamometer at speeds of 90 and 240 degrees/second. Fastball speed was measured with a hand held radar gun. Results of regression analyses performed on the data indicate a strong correlation between the …
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Development of control algorithm for a new 12s-6p single phase field excited flux switching motor
… motor’s dynamic performance in terms of torque and current consumption. In this research, two algorithms have been proposed in which first algorithm is based on bipolar DC signals while second algorithm is based on field oriented control (FOC) principle. For position detection, algorithms …
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Design and Implementation of a Novel Control System for Four Quadrant Operation of a Two-Phase Switched Reluctance Motor
… suffer from the same magnitude of peak to peak torque ripple that single phase machines experience due to their wide zero torque arcs. Yet two phase systems keep a relatively low component count in their power-converter designs. The primary drawback to two phase motors is the difficulty of …
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Neuromuscular factors contributing to reductions in muscle force after repeated, high-intensity muscular efforts
… accumulate sufficiently to limit muscular force production during repeated, forceful muscle contractions, including those that occur in the occupational, clinical and athletic settings. Fatigue during such efforts is likely to result from disturbances to multiple processes in the nervous system …
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TRANSCUTANEOUS ELECTRICAL STIMULATION DOES NOT DECREASE TORQUE LOSS OVER HIGH INTENSITY REPETITIONS
… of the exercise for each condition. The average torque, average decline in torque per set, and the participant pain ratings were collected. The ANOVA pairwise comparison showed a significant (p</p>
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Integrated on-board battery chargers for EVs based on multiphase machines and power electronics
… extent. The main reason is the undesirable torque production in machines integrated into the charging process during the battery charging, which is unavoidable when a three-phase machine of either synchronous or induction type is used. The thesis investigates integrated on-board battery …
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Mechanisms affecting post-activation potentiation following voluntary isokinetic knee extension
… also examined. Voluntary and electrically-evoked torques and electromyogram (EMG) data were captured before and after five different dynamic (isokinetic) CAs, after the participants had completed an extensive warm-up including extensive task-specific practice to the point where maximal voluntary …