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 42 for “"Mechanical Impedance"”.
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Ankle mechanical impedance under muscle fatigue
… the effects of ankle muscle fatigue on ankle mechanical impedance. It suggests that decreasing ankle impedance with muscle fatigue may contribute to an increased probability of ankle injury. If confirmed, this observation may have important athletic, military and clinical implications. The …
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Measurement of physician hand & patient tissue mechanical impedance
… actuated device is capable of measuring the mechanical impedance of both the compliant patient tissue in contact with its end effector and of the hand of the operator holding the device. The particular device being investigated is an actuated ultrasound probe originally designed to regulate …
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Quantitative characterization of multi-variable human ankle mechanical impedance
Ankle mechanical impedance, which is a dynamic relationship between angular displacement and the corresponding torque at the ankle joint, plays a key role in natural interaction of the lower-extremity with the environment. The human ankle is a biomechanically complex joint consisting of three bones …
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Mechanical impedance control of robotic manipulators in Cartesian coordinates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Measuring the mechanical impedance of the isolated tectorial membrane
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Design and applicability of a mechanical impedance sensor for vein penetration detection
… has reached the vein by measuring the change in mechanical impedance of the needle as it passes through different tissue layers. Testing in a phantom indicated that this has the potential to identify transitions through tissue boundaries.
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Minimally invasive instrument for in vivo measurement of solid organ mechanical impedance
The medical field, and surgeons in particular, are turning to engineers to develop systems that help them learn their craft better. Mannequin-based systems, animal labs and surgery on cadavers each have drawbacks that could be addressed through realistic computer-based surgical simulation systems. …
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Modeling and performance of a Pneumatic/Hydraulic hybrid actuator with tunable mechanical impedance
… Institute of Technology, Dept. of Mechanical Engineering, 1984.
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Dynamic transduction characterization of magnetostrictive actuators
… through application of an electro-magneto-mechanical impedance modeling approach which combines both the mechanical dynamics and coupled behavior of the actuator device. Lumped and continuous mechanical impedance elements model the actuator dynamics and the constitutive relationships for …
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Effects of temperature on the electrical impedance of piezoelectric elements
… (PZT) materials for tracking the structural impedance to qualitatively identify damage. The mechanical impedance of a structure is a function of the structure's mass, stiffness, damping, and structural boundary conditions. Changes in any of the above-mentioned properties lead to a change in …
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Sensitive manipulation
… architecture is replaced by one that uses a low mechanical impedance arm with dense tactile sensing and exploration capabilities run by a behavior-based architecture. The robot OBRERO has been built to implement this approach. New tactile sensing technology has been developed and mounted on the …
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Frequency response of human skin in vivo to mechanical stimulation
… response of human skin was measured, in vivo, to mechanical stimulation at a scale useful in the development of tactile displays. Sinusoidal vibration stimuli of varying frequencies and amplitudes were applied with a flat-ended 0.5 mm diameter cylindrical probe under two conditions: it was either …
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Qualitative health monitoring and incipient damage inspection/evaluation
… integrity has been altered. A qualitative impedance-based health monitoring technique, which can be implemented for real-time damage evaluation of complex structures, is investigated. The basic principle of the technique is to monitor the structure's mechanical impedance which will be …
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All Models are Wrong, Simple Models Provide Insight: A Study of Human Manipulation
… a simple mathematical model, emphasizing mechanical impedance, that competently describes how humans manage physical interaction. Thirdly, we underscore the significance of mechanical impedance through a perceptual study which highlighted humans’ robust ability to perceive limb stiffness. …
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Corn root growth and distribution as influenced by soil physical properties
… tortuous path of root growth led to transitory impedances as roots were deflected around aggregates. Corn roots were able to push small aggregates out of their path. An equation was developed to describe this impedance as a function of aggregate size, root diameter, and deflection angle. …
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The measurement and interpretation of actively modulated static ankle impedance using a therap[e]utic robot
… providing measurements of human static ankle mechanical impedance. Accurate measurements of ankle impedance when muscles were voluntarily activated were obtained using a therapeutic robot, Anklebot, and an electromyographic recording system. Important features of ankle impedance, and their …
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Tissue classification from electric impedance spectroscopy for haptic feedback in minimally invasive surgery
… patient. This thesis proposes using the electric impedance of tissues, instead of the traditionally used mechanical impedance, to develop haptic feedback for surgical robots. Electric impedance spectroscopy (EIS) and a modified surgical needle were successfully able to measure the electric …
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Design and implementation of MEMS biomechanical sensors for real-life measurements of gait parameters
… due to its high performance, in terms of electromechanical coupling factor, bandwidth, mechanical impedance and sensitivity. An investigation into the capability of MEMS technology in the design and analysis of ultrasonic transducer is reported. The work includes an investigation into design …
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Avaliação do potencial alelopático de resíduos foliares do Algodão de Seda sobre Picao-preto e Desmódio.
… results were caused by allelopathic action or mechanical impedance.
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