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 27 for “"Voice-coil"”.
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Design of a voice coil actuated office chair
… decisions. The advantages and drawbacks of the Voice Coil Actuators used in the design are also discussed. A prototype control system, enabling ergonomically beneficial motion is described and analyzed. Additionally, qualitative feedback from human testers is given, and suggestions for future …
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Modeling and characterization of a voice coil motor
This thesis describes the development of a voice-coil motor that will allow viscous fluids to be delivered via a portable needle-free injection device. The chosen motor design features opposing magnets whose flux is channeled across the air gap by a center radial magnet, thus creating a higher flux …
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Control of Voice Coil Actuator With Application to Cam Turning
Cam machining results demonstrate that voice coil drives can be successfully used in industrial turning applications.
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Design and characterization of a compact voice coil for a needle-free injection device
… BiLab) is novel in its use of a Lorentz force voice coil actuator as the pressure source. With servo-control, the applied pressure can be adjusted for injection conditions such as skin toughness and injection depth. The focus of this thesis was on designing, building and characterizing a more …
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Design and control of a voice coil actuated robot arm for human-robot interaction
… work in the design and evaluation of long-travel voice coil actuators (VCAs) for use in robots intended for interacting with people. The basic advantages and shortcomings of electromagnetic actuators are discussed and evaluated in the context of human-robot interaction, and are compared to …
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Controllable needle-free injection : development and verification of a novel device
… depths via electrical control of a Lorentz-force voice coil actuator. A benchtop proof-of-concept device was created to prove the concept of needle-free injection using a voice coil. After the successful testing of the proof-of-concept device, a handheld prototype was designed, manufactured, and …
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Construction and performance of an inverted pendulum thrust balance
… (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 initial design proposed by Professor Manuel …
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System identification and control of a miniature external mechanical vibration device towards clinical ultrasound shear wave elastography
… EMV SWE system consisting of up to two vibrating voice coil actuators (VCAs) attached to a commercial ultrasound probe was previously designed and developed. The vibration of the VCAs was synchronized with the commercial ultrasound system to induce shear waves, replacing the ARF.
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A multi finger electromagnetic actuator apparatus for biomechanical studies on the hand
… haptic device powered by electromechanical voice-coil actuators. Five actuators 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 …
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The development of new actuation systems for mechatronic toys
… flexible shafts, output switching, and voice coil actuators using flexural transmission. Each of these products is still in the initial stages of development, but each also has the potential to significantly increase the realism of current and future toys. The most developed of these …
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Design and use of a fixed-end low-load material testing machine
… and compression tests. It is actuated by a voice coil and displacement is measured using strain gauges. This thesis outlines some of the basic theory involved in the design and use of this low-load machine. Then it details calibration routines and tension testing procedures. Next, it …
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Liquid lens beam steering and environmental testing for the miniature optical steered antenna for inter-satellite communication
… actuation, while Optotune lenses are driven by a voice coil. For steering, a liquid lens is placed offset from the optical axis. Varying the liquid lens focal length will cause the beam to steer in 1D by refraction, but also causes a change in beam divergence. Adding an on-axis focusing liquid …
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Design and Fabrication of an Oscillating Tool for Powder Spreading in Metal Additive Manufacturing
… powered by either a piezoelectric stack or a voice coil linear motor. The machining of parts was qualified for runout and straightness, and the assembly of the piezo mechanism was built onto the testbed. Work remains to complete the system implementation and to test the motion and simulation …
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Dynamic testing of polydimethylsiloxane for applications in micro-contact roll printing
… A mechanical structure which integrates a voice coil actuator with a load cell and linear variable differential transformer was designed for this purpose. A model and controller were also built to predict the dynamic behavior of the polydimethylsiloxane. In future work the mechanical …
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An optimized Linear Lorentz-force Actuator for biorobotics and needle-free injection
Voice coils are a configuration of Linear Lorentz-force Actuator (LLA) that offer efficient transduction of electrical energy into linear motion. The simple geometry of a typical voice coil motor makes the configuration easily tunable for custom applications. Recent advances in high-energy magnets …
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Design and testing of an improved animatronic toy actuator
… various ideas for converting the vibration of a voice coil into rotational motion. In its final form, it is believed that this actuator will provide a lowspeed, high-torque output using a single unit, eliminating the need for external gearing. Currently, such motion is actuated by direct current …
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Acquisition and control of a precision formation flying mission
… by an optical delay line consisting of a voice coil mirror and a piezo mirror.
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Ultrasound shear wave elastography imaging with external mechanical vibration
… tissue stiffness. A mechatronic device using a voice coil actuator (VCA) to realize the EMV concept was prototyped. The mechanical vibrator was mounted on a commercial ultrasound probe and the vibration was synchronized with commercial ultrasound platform to induce shear waves as replacement of …
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Design and characterization of tunable stiffness flexural bearings
… to flexure compression and in response to a voice coil actuator acting in the flexure's compliant direction was measured by seven capacitance probes arranged around the test stage, and a seventh capacitance probe measured the input displacement. With the experimental setup it was found that a …
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Electromechanical systems to enhance the usability and diagnostic capabilities of ultrasound imaging
… scanning. The third device, driven by a voice coil motor, enables high-bandwidth constant force scanning, and was used to measure the elastic modulus of tissue-an indicator of tissue health-at repeatable pre-load forces.
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