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.
Results
Showing 1 to 18 of 18 for “"LVDT"”.
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The Future is Now in Twisted Coil Polymer Actuators (TCPA)
… was to find a linear relationship using the LVDT sensor, fabricating TCPA fibers, and interpreting the data. The project tested whether nylon/polymer could be used as a better artificial muscle fiber.</p> <p>This research accomplished three goals: (1) designing and fabricating a system …
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Effect of Rolling on Viscoelastic Fluids Using a Novel Testing Device
… the vertically placed displacement transducer (LVDT) measurements seemed to fluctuate and may have been do to the LVDT not being firmly held in place. By altering the holder containing the vertical LVDT this error can be avoided in the future. Thus we were not able to compare the fluid film …
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Estudio de la profundidad de siembra en siembra directa de maíz mediante la sensorización de un brazo de una sembradora mecánica monograno
… utilizada se componía de una célula de carga, un LVDT, un sensor magnético angular, una fotocélula y GPS´s, todos ellos instalados sobre uno de los brazos de la sembradora mecánica. El ensayo de siembra se llevo a cabo en la localidad de Elvas (Portugal), dentro de las instalaciones de la …
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Construction and performance of an inverted pendulum thrust balance
… by a linear variable differential transformer (LVDT) and counteracted by a force from a voice coil. The voice coil's neutralizing force nulls the balance back to an equilibrium position and supplies the thrust value produced by the DCF. The inverted pendulum thrust balance was built from an …
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Understanding frequency response of a flexural complaint stage for use in oscillatory orthogonal cutting
… a Linear Variable Differential Transformer (LVDT) and a dynamic signal analyzer via LabView, the frequency response of the stage was measured from 100Hz to 10000Hz. A model was then fitted to the measured response. Using this model, a comparison between a simulated-reference response of the …
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Biotribology: articular cartilage friction, wear, and lubrication
… acquisition of normal load, tangential load, and LVDT displacement; photomacrographs; ESEM and SEM surface studies; stained cross-sectional slides of cartilage; and hydroxyproline analysis of cartilage wear. Detailed procedures and discussion of results are presented along with recommended changes …
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CO2-rock interaction during CO2-enriched brine injection into storage reservoirs using NMR integrated with fiber optic sensors
… by linear variable differential transformers (LVDT) and electrical resistance strain gauges (ESG) that are attached to a rock sample’s surface. However, the geo-mechanical response obtained under laboratory conditions often mismatches with the response of an underground rock formation due to …
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Influencia de las adiciones puzolánicas en los morteros de restauración de fábricas de interés histórico-artístico
… con medida de los desplazamientoss mediente LVDT, y se caracterizaron las fases de fraguado presentes, mediante el uso combinado de ATD/TG, DRX, MEB/DEX y espectrometría de masas. De donde, entre otras conclusiones, se establecieron las ventajas dudosas de los morteros de cal hidráulica …
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Development of an apparatus to quantify the volitional muscle performance of rat plantar flexors in vivo
… via linear bearings. A displacement transducer (LVDT) was attached to the weight pan to measure the range of motion of the lift, and allowed determination of velocity and acceleration of the lifting motion. The apparatus allowed the rat to enter the tube through the opening, insert its neck into …
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The application of laser doppler technique to vibration measurement and position control.
… mm. Correlations with an accelerometer and an LVDT show that the LDI can reliably measure displacement up to a range of 25 mm. with a maximum target velocity of 32 mm/s limited currently be the signal processing. Theoretical resolution with this device is better than 0.08 um. if full use is …
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Bearingless Slice Motor and 6-DoF Position Sensor for Extracorporeal Pump
… has a linear variable differential transformer(LVDT) type structure where the difference in the induced voltages yields the position measurement. This LVDT sensor uses a conductive aluminium target glued to the bottom surface of the rotor. With rotor motion, the target motion varies the induced …
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Bambu laminado colado (Dendrocalamus giganteus) aplicado à treliça plana tipo Howe e à viga retangular
… utilizando-se medidores de deslocamentos (LVDT) e extensômetros elétricos (strain gage). Em seguida, foram ensaiadas 15 (quinze) vigas de BLC (bambu laminado colado) com 75,0 cm de vão, 2,88 cm de base e 4,99 cm de altura, por meio de ensaio de Stuttgart. Os resultados destas vigas foram …
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An experimental method to measure crystal growth rate in porous materials and quantity deformation developed during crystal growth
… strain and crystal propagation rate using an LVDT and thermocouples respectively. For this thesis work we also used X-ray computed tomography (X-CT) to investigate where salts tend to distribute within stone cores. This technique enables one to image the morphology and internal structure of …
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ASTM assessment of a novel shoulder prosthetic design: measurement of glenoid edge motion in three degrees of freedom
… system. The edge motion measurement system uses LVDT sensors to track the motion of rigid blocks on the end of lever arms connected to the glenoid edges. The block's motion is converted to complex glenoid edge motion using a MATLAB algorithm based on the system geometry. The test rig and edge …
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1-g Shake Table Experimental Evaluation of Building Settlements Founded on Liquefiable Soils
… and linear variable differential transformers (LVDT) to monitor behavior in both free-field and model building footprints during induction of liquefaction. A comprehensive parametric study was conducted evaluating the influence of key parameters. Results of this study suggest the following on …
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Lateral load distribution for steel beams supporting an FRP panel.
… load. Linear variable distribution transformers (LVDT) were mounted at mid-span of each beam to measure deflection. Loads were placed at the center of the panel, with reference to the 6 ft direction and at several locations along the 8.5 ft direction. Strain and deflection readings were taken in …
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Integral bridge abutment and backfill behaviour
… PD 6694-1 (BSI, 2020). Sensors included an LVDT and load cell measuring applied movement and axial force in the bridge deck, strain gauges to capture abutment bending moments, a Tekscan sensor measuring lateral earth pressures, and a camera to track soil and structural movements. A total of …
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Fatigue Behaviour of CFRP Strengthened Reinforced Concrete Beams
… linear variable differential transducers (LVDT), DEMEC strain targets and digital image correlation (DIC). Ultimate failure loads under monotonic loading showed that despite having the highest degree of corrosion, the 450mm damage extent specimen had the highest failure load of 325kN. The …