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Artykuły w czasopismach na temat "Register Transducers"
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Yurikov, Alexey, Nazanin Nourifard, Marina Pervukhina i Maxim Lebedev. "Laboratory ultrasonic measurements: Shear transducers for compressional waves". Leading Edge 38, nr 5 (maj 2019): 392–99. http://dx.doi.org/10.1190/tle38050392.1.
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The ultrasonic measurements technique is well established to measure the elastic properties of rocks in the laboratory for seismic and well-log data interpretation. The key components of every laboratory ultrasonic setup are piezoelectric transducers, which generate and register elastic waves in rock samples. The elastic properties of rocks are determined through the velocities of elastic waves, which are measured by the times of the waves' travel from the source to the receiver transducer. Transducers can be specifically designed to generate P-waves (P-transducers) or S-waves (S-transducers). In limited studies, the measurement of P-wave velocities with S-transducers is mentioned. Such measurement is possible due to specific aspects of the operation of S-transducers. Namely, S-transducers are known to emit parasitic low-energy P-waves, which travel faster than high-energy S-waves and hence can be registered. However, no justification or elaboration of this method of measuring P-wave velocities was reported. To fill this gap, we first compare P-wave velocities measured with S-transducers against P-wave velocities measured with P-transducers in different rocks and materials. We show that the discrepancy between velocities measured with the two methods in homogeneous materials is less than 1% and can be up to 4% for natural rocks. Second, we numerically simulate the operation of S-transducers, show that parasitic P-waves have a dipole structure, and explain how the receiver transducer can register this compressional dipole. Finally, we use laser doppler interferometry to measure the displacement of the free surface of a sample caused by elastic waves emitted by the source S-transducer. We observed the dipole structure of the sample's surface displacement upon P-wave arrival on the surface.
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Catangiu, Adrian, Ileana Nicoleta Popescu, Dan Nicolae Ungureanu i Aurora Anca Poinescu. "Development of Experimental Device with Data Acquisition for Thermomechanical Characterization of Polymers". Scientific Bulletin of Valahia University - Materials and Mechanics 18, nr 18 (1.04.2022): 26–32. http://dx.doi.org/10.2478/bsmm-2022-0004.
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Abstract The aim of this paper is to present a handmade laboratory device with data acquisition for estimating the thermomechanical characteristics (caused by dimensional changes in height) of polymeric materials. This experimental device is able to perform penetration tests, monitoring the expansion of the samples and based on experimental tests, the thermal expansivity or coefficient of thermal expansion (CTE) can be determined. A data acquisition instrument, which register (i) the deformation of the specimen, by using two displacement transducers (an inductive proximity transducer and an transmission type photoelectric linear encoder) as well as registers (ii) the temperature (at the base of the specimen and in the vicinity of the point of contact with the penetrator) is used. In order to test the device and to highlight its qualities, preliminary tests were carried out on a thermosetting polymeric material in various stages of polymerization.
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Fedynets, Vasyl, i Ihor Vasylkivskyi. "Optimization of Thermal Subsystem of Thermo Transducers for Measuring the Temperature of Gas Flows". Energy engineering and control systems 8, nr 2 (2022): 110–17. http://dx.doi.org/10.23939/jeecs2022.02.110.
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The error of measuring the temperature of gas flows by contact methods consists of two main components: 1) the error that occurs in the process of measuring the physical quantity into which the temperature is converted (the error of the measuring means); 2) errors arising in the process of converting the temperature into a measured physical value using a thermo transducer. This component of the error is completely thermal in nature and is determined by the conditions of the thermal balance between the studied gas flow and the thermo transducer and has the greatest impact on the overall measurement error. It is determined by the combined action of the following factors: heat transfer due to radiation to or from the thermo transducer; heat removal from thermo transducer due to thermal conductivity; by converting part of the kinetic energy of the gas flow into thermal energy in the wall layer surrounding the thermo transducer; by convective transfer of heat from the wall layer to the sensitive element of the thermo transducer. Note also that if the temperature of the gas flow is non-stationary, then due to the thermo transducer's own heat capacity, it does not have time to register the time-varying temperature of the flow. Due to this, a dynamic component of the measurement error arises during the measurement of non-stationary temperatures. The article investigates the component error determined by the conditions of heat exchange between the gas flow and the thermo transducer.
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Pino-Ortega, José, Alejandro Bastida-Castillo, Alejandro Hernández-Belmonte i Carlos D. Gómez-Carmona. "Validity of an inertial device for measuring linear and angular velocity in a leg extension exercise". Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 234, nr 1 (11.10.2019): 30–36. http://dx.doi.org/10.1177/1754337119878296.
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Traditionally, linear transducers have been used to evaluate resistance exercise with linear displacement. The current problem is the assessment of exercises with curvilinear displacement. For this reason, new devices should be assessed during training sessions. The purpose was to evaluate (1) the concurrent validity of mean linear velocity and (2) the convergent validity of mean angular velocity measured by an inertial device during a leg extension exercise. Ten elite-level football players completed six series of five repetitions of a leg extension exercise. WIMU PRO™ inertial device and GymAware® linear transducers as criterion measure were used to register data. To assess concurrent validity, the bias of the inertial device measures of velocity was analyzed with Bland–Altman plots with limits of agreement set at 95%. Convergent validity of inertial device measures of velocity was assessed with Pearson’s correlation analysis. Concurrent analysis showed a nearly perfect validity between linear transducers and inertial device in linear ( Bias = –0.011 ± 0.006) and angular velocity (–0.34 ± 2.08). A nearly perfect Pearson’s product–moment correlation coefficient between an inertial device and linear transducers in linear velocity ( r = 0.999) and between an inertial device and linear transducers (calculated) in angular velocity ( r = 0.999) was found. In conclusion, WIMU PRO is valid for measuring linear and angular velocity during two-dimensional linear and rotational motions of exercise equipment. This device can be used as a useful tool to assess movement velocity in resistance training exercises, even in curvilinear movements when linear transducers have obvious limitations.
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Roebuck, Bryan, M. Brooks i M. G. Gee. "Load Cell Ringing in High Rate Compression Tests". Applied Mechanics and Materials 1-2 (wrzesień 2004): 205–10. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.205.
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Mechanical test machines play an important role in providing simulation data to underpin careful analysis of high rate processes. In many cases elements of the test frame or testpiece can vibrate when subjected to a high rate force. The transducers attached to the machine frequently register this vibration superimposed on the true signal and thus may mask the signal required for analysis [1-4]. At impact all the parts of the test machine oscillate at their natural frequency (dependent on stiffness and mass). Ringing in test machines is determined by the rate at which the testpiece is deformed, the elastic characteristics of test material and resonances in components of load train anvils in compression. In the current work high rate hot compression tests are being developed to underpin best practice measurement guides on test methods for studying the dependence of strength on deformation rate and temperature, [5-7]. At higher rates of deformation ringing is observed in the transducer signals for load and displacement and this measurement note summarises the results of systematic tests to investigate this issue. A purpose built software tool was developed for analysing the time dependence of the transducer signals.
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Malinowski, Pawel, Tomasz Wandowski, Irina Trendafilova i Wiesław M. Ostachowicz. "Multi-Phased Array for Damage Localisation". Key Engineering Materials 347 (wrzesień 2007): 77–82. http://dx.doi.org/10.4028/www.scientific.net/kem.347.77.
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A method for damage localisation has been developed, which is based on the phased array idea. Four arrays of transducers, instead of only one, are used to perform a beam-forming procedure. Each array consists of nine transducers placed along a line, which are able to excite and register elastic waves. The arrays are placed in such a way that the angular difference between them is 45º and the rotation point is the middle transducer, which is common for all the arrays. The idea has been tested on a square aluminium plate modelled by the Spectral Finite Element Method. Two types of damage were considered, namely distributed damage, which was modelled as stiffness reduction, and cracks, modelled as separation of nodes in selected finite elements. The plate is excited by a wave packet (5-cycle sine modulated by the Hanning window). The whole array system is placed in the middle of the plate. Each phase array in the system acts independently and produces maps of a scanned field based on the beam-forming procedure. These maps are made of signals that represent the difference between the damaged plate signals and those from the intact plate. An algorithm was developed to join all four maps. This procedure eliminates the necessity to analyse each map individually and also gives the possibility to extract common features only. It allows to remove ambiguity and helps to localise damage more precisely than in the case of a single map. The problem for damage localisation was investigated and exemplary maps confirming the effectiveness of the system proposed were obtained. The investigation is based exclusively on numerical data.
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Golovachev, Petro, Ivan Korobko i Vitalii Krotevich. "INVESTIGATION OF THE UNCERTAINTY VALUE AT MEASURING THE TEMPERATURE OF THE COOLANT IN THE PIPELINES WITH OUTSIDE SURFACE MOUNTED TEMPERATURE SENSORS". Bulletin of Kyiv Polytechnic Institute. Series Instrument Making, nr 62(2) (24.12.2021): 42–49. http://dx.doi.org/10.20535/1970.62(2).2021.249199.
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During performing technological and production processes and monitoring the modes of their operation, the problem of determining the temperature of various media transported through pipelines is solved without incut temperature sensors (TS) in them, i.e. with using outside surface mounted TS (SMTS). This method is allowing to measure mechanical values at technological processes without structure broken and without influence to physicochemical properties of measured media.
Using of SMTS possible to register heat losses on sections of heating mains, pollution degree of pipelines internal walls, to control serviceability of measurement channels of temperature of the coolant in heat meters, etc.
In the article authors presents results of research the uncertainty values for measuring of the coolant temperature in heating systems pipelines under different modes of its flow. First of all, the uncertainty value of the measurements results was estimated, which was determined by the results of the study for the calculation model and field tests at existing district heating systems.
Emphasis is paid on estimating the difference between the registration of temperature in the middle of the pipeline, determined by mortise transducers and the temperature measured by outside surface mounted temperature transducers, taking into account the temperature gradient across the pipeline and the quality of its insulation.
It is determined that: the temperature measured by temperature transducers on the surface of the pipeline at different points of its perimeter, with proper installation and sufficient thermal insulation does not depend on their location; the average temperature on the surface of the pipeline, measured using the developed method of installation of PT, slightly differs (ΔT ≈- 0.3⁰C) from the average temperature of the coolant in the middle of the flow; temperature transducers have high reproducibility of measurements and small difference in readings between channels at parallel measurements (»0,03⁰С).
It is substantiated that high metrological performances of temperature transducers allow to use them for solving other tasks: measuring the distribution of heat fluxes in heating systems of residential buildings to perform hydraulic balancing of heating systems and increase their efficiency; estimate of contamination of pipelines and heat exchange equipment to determine the need for their washing; determination of thermal resistance of buildings protective structures to assess their energy efficiency; determination of large pumps efficiency by calorimetric method; checking the correct of operation the temperature measuring channels of heat meters and cold meters; in other technology areas where measurements of small temperature differences with high accuracy are required.
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Smirnov, Andrey, Boris Zaitsev, Andrey Teplykh, Ilya Nedospasov, Egor Golovanov, Zheng-hua Qian, Bin Wang i Iren Kuznetsova. "The Experimental Registration of the Evanescent Acoustic Wave in YX LiNbO3 Plate". Sensors 21, nr 6 (23.03.2021): 2238. http://dx.doi.org/10.3390/s21062238.
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Evanescent acoustic waves are characterized by purely imaginary or complex wavenumbers. Earlier, in 2019 by using a three dimensional (3D) finite element method (FEM) the possibility of the excitation and registration of such waves in the piezoelectric plates was theoretically shown. In this paper the set of the acoustically isolated interdigital transducers (IDTs) with the different spatial periods for excitation and registration of the evanescent acoustic wave in Y-cut X-propagation direction of lithium niobate (LiNbO3) plate was specifically calculated and produced. As a result, the possibility to excite and register the evanescent acoustic wave in the piezoelectric plates was experimentally proved for the first time. The evanescent nature of the registered wave has been established. The theoretical results turned out to be in a good agreement with the experimental ones. The influence of an infinitely thin layer with arbitrary conductivity placed on a plate surface was also investigated. It has been shown that the frequency region of an evanescent acoustic wave existence is very sensitive to the changes of the electrical boundary conditions. The results obtained may be used for the development of the method of the analysis of thin films electric properties based on the study of evanescent waves.
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Sosa, J., Juan A. Montiel-Nelson, R. Pulido i Jose C. Garcia-Montesdeoca. "Design and Optimization of a Low Power Pressure Sensor for Wireless Biomedical Applications". Journal of Sensors 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/352036.
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A blood pressure sensor suitable for wireless biomedical applications is designed and optimized. State-of-the-art blood pressure sensors based on piezoresistive transducers in a full Wheatstone bridge configuration use low ohmic values because of relatively high sensitivity and low noise approach resulting in high power consumption. In this paper, the piezoresistance values are increased in order to reduce by one order of magnitude the power consumption in comparison with literature approaches. The microelectromechanical system (MEMS) pressure sensor, the mixed signal circuits signal conditioning circuitry, and the successive approximation register (SAR) analog-to-digital converter (ADC) are designed, optimized, and integrated in the same substrate using a commercial 1 μm CMOS technology. As result of the optimization, we obtained a digital sensor with high sensitivity, low noise (0.002 μV/Hz), and low power consumption (358 μW). Finally, the piezoresistance noise does not affect the pressure sensor application since its value is lower than half least significant bit (LSB) of the ADC.
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Kumar Y, L. V. Santosh. "Design and Implementation of SAR-ADC for Medical Electronic Applications". International Journal of Advanced Research in Computer Science and Software Engineering 8, nr 5 (2.06.2018): 55. http://dx.doi.org/10.23956/ijarcsse.v8i5.665.
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in today’s advance electronic and communication systems the role of high accuracy analog to digital converters are of great importance. Nowadays, a larger percentage of mixed-signal applications requires for health care systems. Also the speed of the chosen ADC design matters a lot as we are connected with the real world signals. SAR based ADC will provides us a better solution for various analog to digital systems. It is an essential device whenever data from the analog world, through sensors or transducers, should be digitally processed or when transmitting data between chips through either long-range wireless links or high-speed transmission between chips on the same printed circuit board. The paper projects up down and ring counter as a logic for successive approximation register (SAR logic for a ADC that is one of the best suited for low power. Here the resolution is of 4-bit and a power consumption of few milli watts. SAR ADC is implemented in 45 nm nano-meter scaling technology CMOS technology with a power supply of 0.5v by maintaining 4:1 w/l ratio.
Rozprawy doktorskie na temat "Register Transducers"
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Exibard, Léo. "Automatic synthesis of systems with data". Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0312.
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Nous interagissons régulièrement avec des machines qui réagissent en temps réel à nos actions (robots, sites web etc). Celles-ci sont modélisées par des systèmes réactifs, caractérisés par une interaction constante avec leur environnement. L'objectif de la synthèse réactive est de générer automatiquement un tel système à partir de la description de son comportement afin de remplacer la phase de développement bas-niveau, sujette aux erreurs, par l'élaboration d'une spécification haut-niveau.Classiquement, on suppose que les signaux d'entrée de la machine sont en nombre fini. Un tel cadre échoue à modéliser les systèmes qui traitent des données issues d'un ensemble infini (un identifiant unique, la valeur d'un capteur, etc). Cette thèse se propose d'étendre la synthèse réactive au cas des mots de données. Nous étudions un modèle adapté à ce cadre plus général, et examinons la faisabilité des problèmes de synthèse associés. Nous explorons également les systèmes non réactifs, où l'on n'impose pas à la machine de réagir en temps réelWe often interact with machines that react in real time to our actions (robots, websites etc). They are modelled as reactive systems, that continuously interact with their environment. The goal of reactive synthesis is to automatically generate a system from the specification of its behaviour so as to replace the error-prone low-level development phase by a high-level specification design.In the classical setting, the set of signals available to the machine is assumed to be finite. However, this assumption is not realistic to model systems which process data from a possibly infinite set (e.g. a client id, a sensor value, etc.). The goal of this thesis is to extend reactive synthesis to the case of data words. We study a model that is well-suited for this more general setting, and examine the feasibility of its synthesis problem(s). We also explore the case of non-reactive systems, where the machine does not have to react immediately to its inputs
Części książek na temat "Register Transducers"
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Exibard, Léo, Emmanuel Filiot i Pierre-Alain Reynier. "On Computability of Data Word Functions Defined by Transducers". W Lecture Notes in Computer Science, 217–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45231-5_12.
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AbstractIn this paper, we investigate the problem of synthesizing computable functions of infinite words over an infinite alphabet (data $$\omega $$ ω -words). The notion of computability is defined through Turing machines with infinite inputs which can produce the corresponding infinite outputs in the limit. We use non-deterministic transducers equipped with registers, an extension of register automata with outputs, to specify functions. Such transducers may not define functions but more generally relations of data $$\omega $$ ω -words, and we show that it is PSpace-complete to test whether a given transducer defines a function. Then, given a function defined by some register transducer, we show that it is decidable (and again, PSpace-c) whether such function is computable. As for the known finite alphabet case, we show that computability and continuity coincide for functions defined by register transducers, and show how to decide continuity. We also define a subclass for which those problems are PTime.
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Khalimov, Ayrat, Benedikt Maderbacher i Roderick Bloem. "Bounded Synthesis of Register Transducers". W Automated Technology for Verification and Analysis, 494–510. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01090-4_29.
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Jeż, Artur, Anthony W. Lin, Oliver Markgraf i Philipp Rümmer. "Decision Procedures for Sequence Theories". W Computer Aided Verification, 18–40. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37703-7_2.
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AbstractSequence theories are an extension of theories of strings with an infinite alphabet of letters, together with a corresponding alphabet theory (e.g. linear integer arithmetic). Sequences are natural abstractions of extendable arrays, which permit a wealth of operations including append, map, split, and concatenation. In spite of the growing amount of tool support for theories of sequences by leading SMT-solvers, little is known about the decidability of sequence theories, which is in stark contrast to the state of the theories of strings. We show that the decidable theory of strings with concatenation and regular constraints can be extended to the world of sequences over an alphabet theory that forms a Boolean algebra, while preserving decidability. In particular, decidability holds when regular constraints are interpreted as parametric automata (which extend both symbolic automata and variable automata), but fails when interpreted as register automata (even over the alphabet theory of equality). When length constraints are added, the problem is Turing-equivalent to word equations with length (and regular) constraints. Similar investigations are conducted in the presence of symbolic transducers, which naturally model sequence functions like map, split, filter, etc. We have developed a new sequence solver, SeCo, based on parametric automata, and show its efficacy on two classes of benchmarks: (i) invariant checking on array-manipulating programs and parameterized systems, and (ii) benchmarks on symbolic register automata.
Streszczenia konferencji na temat "Register Transducers"
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Cai, Zhonghua, Yinghua Zhong, Zhe Li i Deyu Wang. "Experimental Study of Impact Pressures and Reaction Forces on a VLGC Tank Due to Sloshing". W ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20969.
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This study presents results of an experimental study of slosh-induced impact pressures and reaction forces on a 80,000 m3 VLGC (Very Large Gas Carrier) tank. The scale of the model tank was 1/45.5. Experiments were performed with 30% and 70% filling levels. Single and coupled motion tests were carried out. Excitation amplitudes and frequencies were based on the guideline of Lloyd’s Register. For measuring impact pressures and reaction forces, 12 pressure transducers and 48 force transducers were installed on the model. The experimental results showed that coupled pitch and roll motion causes the maximum impact pressures. Heave motion has little effect on impact pressures. The impact pressures of side transducers on the longitudinal tank wall are larger than those of middle transducers which are of the same height. Coupled motion causes larger reaction forces.
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Yang, Yichao, Jiayue Shen, Mark A. Levenstein i Zhili Hao. "Preliminary Study of a Polymer-Based Microfluidic Device for Detecting Distributed Shear Loads". W ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36670.
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This paper reports on a polymer-based microfluidic device for detecting distributed shear loads. This device is comprised of a symmetric 3D polydimethylsiloxane (PDMS) microstructure, two electrolyte-filled microchannels embedded underneath the microstructure, and a set of electrode pairs distributed along the length of each microchannel. In conjunction with its electrode pairs, one body of electrolyte in each microchannel functions as distributed resistive transducers along the microchannel length. The 3D microstructure is built into a rectangular block with a narrow shear-loading bump on its top. The edges of the bump are aligned right at the width centers of the two microchannels. Thus, distributed shear loads acting on the bump translate to normal loads of opposite directions on the tops of the two microchannels, and consequently opposite geometrical changes in the microchannels, which register as resistance changes by the distributed resistive transducers. Together with a CNC mold, a two-mask photolithographic fabrication process is employed to fabricate a prototype device. The fabricated device is tested using a custom experimental setup. The experimental results validate the design concept of the device and further show that the device exhibits a linear response to shear loads with good repeatability.
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Portillo, Jason, Travis Meade, John Hacker, Shaojie Zhang i Yier Jin. "RERTL: Finite State Transducer Logic Recovery at Register Transfer Level". W 2019 Asian Hardware Oriented Security and Trust Symposium (AsianHOST). IEEE, 2019. http://dx.doi.org/10.1109/asianhost47458.2019.9006699.
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AHAMAD, SULTAN, PAWEL H. MALINOWSKI, ROHAN SOMAN i TOMASZ WANDOWSKI. "STUDY OF THE GUIDED WAVE SENSING BY HYBRID PIEZOELECTRIC-FBG APPROACH". W Structural Health Monitoring 2023. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/shm2023/37022.
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In this research, analysis of ultrasonic guided wave sensing using fiber optic strain sensors based on fiber Bragg gratings (FBG) is presented. Wave excitation is based on piezoelectric transducers. Sensitivity of the FBG sensors to propagating ultrasonic waves plays an important role in the design process of SHM system based on fiber optic sensors. The presented study has experimental character. Separation of symmetric and antisymmetric modes is studied based on simultaneous sensing of the guided waves with two FBG sensors. The influence of actuation is studied for various frequencies of excitation. Moreover, influence of piezoelectric transducers with different diameters on the wave signals registered at the FBG sensors is investigated. The obtained results show significant impact of the diameter of the piezoelectric actuators on the guided waves signals registered by FBGs.
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Gu, Wenting, Peng Cheng i Zhili Hao. "Concurrent Spatial Mapping of the Elasticity of Heterogeneous Soft Materials via a Polymer-Based Microfluidic Device: A Preliminary Study". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63837.
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This paper presents a preliminary study on achieving concurrent spatial mapping of the spatially-varying elasticity of heterogeneous soft materials via a polymer-based microfluidic device. Comprised of a single compliant polymer rectangular microstructure and a set of electrolyte-enabled distributed resistive transducers, this device is capable of detecting continuous distributed loads. Through pressing a specimen against the device by a rigid probe with precisely-controlled displacements, the spatially-varying elasticity of a specimen is captured by continuous distributed loads acting on the device and is further registered as discrete resistance changes at the locations of the transducers in the device. Concurrent spatial mapping is conducted on homogeneous and heterogeneous specimens, and the related data analysis is performed on the measured results to extract their elasticity. The obtained results demonstrate the feasibility of concurrent spatial mapping of the spatially-varying elasticity of heterogeneous soft materials via this polymer-based microfluidic device.
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Shen, Jiayue, Xavier-Lewis Palmer i Zhili Hao. "Design and Analysis of a Distributed-Deflection Sensor With a Built-In Probe for Mechanical Measurement of Soft Tissues With Curved Surface". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71771.
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This paper presents a theoretical analysis of using a distributed-deflection sensor with a built-in probe for mechanical measurement of soft tissues with curved surface. The core of the sensor is a rectangular polydimethylsiloxane (PDMS) microstructure with a built-in probe on its top and an electrolyte-enabled resistive transducer array at its bottom. Upon being pressed against a tissue region, the built-in probe assists in avoiding extrusions and generating deformations necessary to conform to the curved surface of the tissue region. Consequently, the true mechanical properties of the tissue translate to the spatially distributed deflection in the microstructure, which registers as resistance changes by the transducer array. A simplified 1D theoretical model is created and utilized for correlating the design parameters of the sensor and the probe to the tissue parameters, in order to meet three performance criteria for the tissue-probe-sensor interaction in measurement. Costal cartilage tissues are chosen as the tissue example for analysis. The analyzed results provide the design guideline for the numerical analysis in the future for accurate determination of the design parameters for soft tissues of interest.
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BALASUBRAMANIAM,, KALEESWARAN, TOMASZ WANDOWSKI i PAWEL MALINOWSKI. "DEBONDING ANALYSIS OF COMPOSITE MATERIAL USING ULTRASONIC WAVE-BASED NDT METHODS". W Structural Health Monitoring 2021. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/shm2021/36313.
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The article investigates multiple debonding in a glass fibre reinforced polymer structure (GFRPS) using nondestructive testing (NDT) based on ultrasonic guided waves (UGW) propagation. The piezoelectric transducers (PZT) attached to the material excite the UGW and the registered time signals are analyzed. The debonding are in various depths of the GFRPS. It was assessed using NDT-based tools. The presence of debonding and wave scattering based on the depth and location in GFRPS is studied. This is followed by using signal processing methods to visualize and analyze the different characteristics of the ultrasonic waves before and after the debonding. Thus an experimental-based approach to identify the debonding inside the GFRPS and its influence is studied.
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Ya’akobovitz, Assaf, i Slava Krylov. "Kinematically Excited Large Angle Tilting Actuator". W ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28454.
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We report on a novel architecture and operational principle of a large angle kinematically excited tilting micro actuator. The device transforms and amplifies small linear out-of-plane motion of a parallel-plate electrostatic transducer into a tilting motion of a plate. The device characterized by robust single layer architecture was fabricated using a silicon on insulator (SOI) wafer and common deep reactive ion etching (DRIE) based fabrication process. Experimental and model results collectively illustrate the feasibility and efficiency of the suggested actuation approach. The optical tilting angle of 37.5° was experimentally registered under relatively low actuation voltage of 100 V.
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Wang, Dan, Andrew Stamenkovich, Christian Zemlin i Zhili Hao. "Arterial Pulse Signal Monitoring During the Valsalva Maneuver via a Flexible Microfluidic-Based Sensor". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66735.
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In light of the need to diagnose and monitor the heart condition of a heart failure patient, this paper presents a preliminary investigation on the application of a flexible microfluidic-based sensor for measuring the arterial pulse signal during the Valsalva Maneuver (VM), which allows assessment of the patient’s volume status. The core of the sensor is a polydimethylsiloxane (PDMS) microstructure embedded with a 5x1 electrolyte-enabled resistive transducer array. As a time-varying load, an arterial pulse signal acting on the microstructure gives rise to the distributed sensor deflection along the microstructure length and further registers as the resistance changes by the transducer array. The radial pulse signals of four healthy subjects during the VM are measured and are further expressed in terms of the absolute resistance and the sensor deflection. The pulse amplitude change in absolute resistance captures the expected hemodynamic response of a healthy subject to the VM, but the sensor deflection does not manifest such response, due to baseline drift. The corresponding pulse signals of the four subjects at-rest are also measured, verifying that the pulse amplitude change in absolute resistance does not arise from baseline drift. In the future, this sensor will be used to measure the arterial pulse signals of heart failure patients during the VM.
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Ya’akobovitz, Assaf, i Slava Krylov. "Large Angle Parametrically Excited Tilting Micro Actuator". W ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59104.
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We present novel operational principle of a tilting MEMS device based on parametric excitation and linear to angular motion transformation. The device is fabricated using a single layer of silicon on insulator (SOI) wafer and combines simple fabrication process with several beneficial features including large tilting angles, wide bandwidth, low sensitivity to deviation in geometrical and operational parameters and low actuation voltage. A theoretical feasibility and performance study was carried out using a lumped model of the device and verified by a coupled three-dimensional simulation. Parametric excitation of the tilting motion was demonstrated experimentally using and external piezoelectric transducer and tilting angles of 39° were registered. The suggested operational approach could be efficiently implemented in many MEMS based applications incorporating tilting elements including micromirrors, bio medical devices and inertial sensors.