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 606 for “"transducers"”.
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Multilayer Ionic Transducers
… layers each approximately 200 microns thick. The transducers are connected in parallel to minimize the electric field requirements for actuation. The tradeoff in deflection and force can be controlled by controlling the mechanical constraint at the interface. Packaging the transducer in an outer …
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Piezoelectric and Magnetostrictive Transducers
Made available in DSpace on 2014-12-04T21:03:03Z (GMT). No. of bitstreams: 1 5805501.pdf: 8039716 bytes, checksum: b087be9bf8848dbe16937d1aa3bd5632 (MD5) Previous issue date: 1958
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Theory of nonlinear transducers
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1950.
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Electromechanical resonators as measuring transducers
… and digital process control, frequency domain transducers have become very attractive due to their virtual digital output. Essentially they are electrically maintained oscillators where the sensor is the controlling resonator.They are designed to make the frequency a function of the physical …
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Strain transducers for active control
This thesis presents the results of a theoretical and experimental study of active vibration control using velocity feedback with piezoceramic actuator(s) and closely located velocity sensor(s). The first part of the thesis presents modeling and design studies for a square piezoceramic actuator …
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Vibrating transducers for fluid measurements
… were carried out on a range of tuning fork transducers, including a circular one in which a pair of disks clamped at the center acted as the tines and gave a simple radial gas displacement. Common to all these transducers is, the linearity of 1/f 2 with gas density for pressures above about …
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Ultrasonic transducers for wideband attenuation measurements
… 3 dB/cm) require therefore that the ultrasonic transducers exhibit efficient wideband characteristics. Piezoceramic transducers vibrating in thickness-mode are the most suitable to generate ultrasound at these frequencies. However, their high acoustic impedances relative to their liquid loads …
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Impedance matching circuit for piezoelectric transducers.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Gesture sensing with flexural ultrasonic transducers
… development of an array of flexural ultrasonic transducers to allow sensing through a fully metal substrate. An analytical model, finite element simulations, and experiments are presented to characterize and optimize the transducers, and a prototype is developed as a proof of concept of the …
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Representing processes as Update Automata and Transducers
… networks, interactive proofs, finite-state transducers, and financial ledgers. We produce a novel solution method and associated transducers for finite systems of arbitrary-order non-homogeneous linear difference equations over a field using Hermite's unimodular polynomial matrix row …
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Statistical machine translation with cascaded probabilistic transducers
… statistical translation system based on cascaded transducers. These transducers can be constructed manually, semi-automatically, or – in restricted form – fully automatically. A training method for these cascaded transducers is developed based on an extension of the HMM alignment model to the …
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Modelling techniques for 1-3 composite transducers
A selection of novel modelling techniques are presented for predicting the behaviour of a thickness mode composite piezoelectric transducer comprising an array of ceramic pillars embedded in a polymer matrix. Finite element analysis is employed to establish the vibrational and electromechanical …
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Categorical semantics and composition of tree transducers
… thesis we see two new approaches to compose tree transducers and more general to fuse functional programs. The first abroach is based on initial algebras. We prove a new variant of the acid rain theorem for mutually recursive functions where the build function is substituted by a concrete functor. …
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Abstract Transducers for Software Analysis and Verification
… efficient and effective. We introduce abstract transducers as the theoretical foundation of this thesis: a type of finite-state transducers with an inherent notion of abstraction for states, the input alphabet, and its output alphabet. Abstracting these transducers allows us to widen both the …
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Advanced modeling techniques for electroactive polymers transducers
Questa tesi si occupa della modellazione dei polimeri elettroattivi (gli attuatori IPMC e IP2C). Nella prima sezione è descritta un introduzione generale dei modelli proposti, mentre, nelle sezioni 2 e 3 è presentato nel dettaglio il modello multifisico degli attuatori. Tali modelli integrano i …
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Single-molecule dynamics of GPCR signal transducers
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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The design of high power ultrasonic transducers
… design and construction of high power ultrasound transducers as well as some of the effects of high power ultrasound. The two design approaches that are researched and applied are the equivalent circuit method and Finite Element Method (FEM). These methods are used in conjunction with each other …
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Capacitive transducers for narrow-band vibratory displacements
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1962.
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Electromechanical Modeling of Encapsulated Ionic Polymer Transducers
… and evaluation of encapsulated ionic polymer transducers is developed. This model in based on a linearly coupled, two port, electrical equivalent circuit model (Newbury, 2002). The proposed model incorporates multilayer beam theory to model the passive stiffness effects of the encapsulation …
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