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 59 for “"Force output"”.
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The design and implementation of a three degree of freedom force output joystick
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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The Effect of Astym Treatment on Muscle Performance
… would result in an immediate change of maximal force output during a unilateral isometric squat test among individuals with a lower extremity injury. </p><p> Methods: Forty-five subjects (14males; 31females) aged between 18-65 years participated in this study. The subjects were randomized into 3 …
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An Electromyographical Analysis of Shoulder and Trunk Muscles During Chest Press on Stable and Unstable Platforms
… during the supine chest press has found that force output capability is compromised without a subsequent decrease in agonist muscle activation. It has been hypothesized that this discrepancy is caused by a co-contraction mechanism at the glenohumeral joint, favoring joint stability over force …
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Electrical stimulation and neuromuscular fatigue in healthy and chronic post-stroke populations
… specific parameters of stimulation that maximize force output and delay the onset of fatigue remain unclear. Frequency, intensity, and pulse pattern are a few of the parameters that can be manipulated to achieve desired outcomes. Strong evidence supports the use of higher frequencies of …
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Analysis, development, and control of multi-degree-of-freedom passive haptic devices
… devices suffer from a serious drawback; their force output is difficult to control. This issue was addressed extensively for planar manipulators but devices with higher degrees-of-freedom (DOF) have not been examined. This thesis proposes a generalized framework for analyzing and controlling …
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The Effects Daily, Maximal of Resistance Exercise on Muscular Function
… results in a depression in maximum muscular force. It is not known whether the force depression is a result of central or peripheral factors. In this study, the two training protocols on different legs determined whether force declines are muscular (peripheral) or psychological (central). …
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Modeling and Optimizing IPMC Microgrippers
… fingers were modeled and optimized for both force exerted and deflection. Using the Comsol model, we were able to determine the tip deflection and force output of many different IPMC fingers which were verified experimentally. Then, using modeFRONTIER we were able to optimize the fingers to …
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Force And Electromyographic Responses To Ergometer Rowing
… movement technique. The ability to produce high force outputs during repetitive contractions is influenced by fatigue and dependent on a number of factors including neuromuscular activities. Neuromuscular activation may be expressed by amplitude and frequency characteristics of the …
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The influence of methylphenidate on heart rate and brain connectivity
… compatible handgrip device which recorded grip force output during a fatiguing handgrip task. To measure HR before and during handgrip exercise I used a MRI compatible electrocardiogram (ECG) machine. My first study aimed to determine the effect of MA on resting state (R-fMRI) FC between CAN …
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Distributed force model for arbitrarily shaped IMPC actuators
… an arbitrarily shaped artificial muscle to the force it produces does not currently exist for actuators made of ionic polymer-metal composites (IPMC), a type of electroactive smart material. The model in this thesis couples a finite element force simulation for IPMC with a novel method of …
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The modeling and characterization of a Lorentz-force actuator for needle-free injection
… needle-free injector that is driven by a Lorentz-force actuator. The current model was able to generate pressures of up to 20 MPa in order to drive a jet of water based solution. In order to improve the needle-free injector, a new Lorentz-force actuator was designed and modeled using finite …
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Copper, Aluminum and Nickel: A New Monocrystalline Orthodontic Alloy
… archwires. Measurements of loading and unloading forces were recorded in both tension and deflection testing. Repeated-measure ANOVA (α= 0.05) was used to compare loading and unloading forces across wires and one-way ANOVA (α= 0.05) was used to compare elastic moduli and hysteresis. To identify …
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Developmental Nicotine Exposure And Its Effects On Morphology And Electrophysiology Of Hypoglossal Motoneurons In The Neonatal Rat
… determine the relation between tongue retraction force and motor unit discharge characteristics. These experiments utilized adult, anesthetized rats to record single motor units, whole muscle electromyography (EMG) activity and tongue retraction force during spontaneous breathing. We determined …
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A bidirectional MEMS thermal actuator as the building block for a programmable metamaterial
… actuators with an emphasis on large travel and force output. Sensing capabilities are accomplished through piezoresistive strain gauges that provide sufficient sensitivity and resolution. An analytical model was created to calculate the performance parameters of actuator designs and was used in …
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Exploring subjective and objective localized muscle fatigue responses at recommended upper limb ergonomics limits
… improvement in error between RPF and measures of force output and electromyography. Study 2 compared the LMF response at three different “acceptable” limits along the ACGIH® threshold limit curve, which describes acceptable relative force intensity for a given level of repetitive work (i.e. duty …
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A multi finger electromagnetic actuator apparatus for biomechanical studies on the hand
… were designed and constructed and a position and force feedback control system was implemented for each. The maximum continuous force output for each actuator ranged from 12-16 N, which is about 15%-30% of the maximum force that can be exerted by an individual finger. The bandwidth of the …
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Compliant, Large-Strain, and Self-Sensing Twisted String Actuators with Applications to Soft Robots
… that has been implemented in robots for high force output and efficiency. The basic components of a TSA are a motor, strings, and a load (to keep the strings in tension). The twisting of the strings shortens their length to generate linear contraction. Due to their high force output, energy …
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Actuation and control for robotic physiotherapy
… device through the implementation of force and position control strategies. Traditional pneumatic servo systems consist of a pneumatic cylinder prone to stiction effects and a single spool valve. Here the performance of modem pneumatic servo system, consisting of a low friction …
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Electromagnetic nanopositioner
… are the flux-steering actuator that applies a force linear in both coil current and displacement, replacement of the conventional metal flexures with rubber bearings, as well as power and sense electronics that can be easily integrated into a compact package. A prototype of this class of …
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Empirical model-based control for end milling process
… finish quality by maintaining on-line cutting force values. The proposed model has been developed to present the control model constraints, by varying the machining parameters to control the force output to be constant. To relate the surface finish and the cutting force in the end milling …
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