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Добірка наукової літератури з теми "Actuation thermale"

Автор: Grafiati

Опубліковано: 23 вересня 2022

Оновлено: 27 січня 2023

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Статті в журналах з теми "Actuation thermale"

Yoon, Kwang Joon, Kyu Young Kim, Nam Seo Goo, Hyun Chul Park, and J. R. Haw. "Actuator Performance Degradation of Piezo-Composite Actuator LIPCA under Cyclic Actuation." Key Engineering Materials 261-263 (April 2004): 1331–36. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1331.

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This paper is concerned with the fatigue characteristics of LIPCA (LIghtweight Piezo-Composite Actuator) device system. LIPCA device system is composed of a piezoelectric ceramic layer and fiber reinforced light composite layers, typically a PZT ceramic layer is sandwiched by a top fiber layer with low CTE (coefficient of thermal expansion) and base layers with high CTE. The advantages of the LIPCA design are using the lightweight fiber reinforced plastic layers without compromising the generation of high force and large displacement and to have design flexibility by selecting the fiber direction and the size of prepreg layers. In addition to the lightweight advantage and design flexibility, the proposed device can be manufactured without adhesive layers when we use resin prepreg system. To investigate the degradation of actuation performance of LIPCA due to the repeated fatigue loading, the repeated loading tests up to several million cycle were performed and the actuation displacement for a given excitation voltage was measured during the test. The fatigue characteristics was measured using an actuator test system consisted of an actuator supporting jig, a high voltage actuating power supplier, and a non-contact laser measuring system and evaluated.

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Zhang, Xi, Jinxuan Zhang, Bidita Salahuddin, Shuai Gao, Shazed Aziz, and Zhonghua Zhu. "Reversible Torsional Actuation of Hydrogel Filled Multifilament Fibre Actuator." Actuators 10, no. 9 (September 21, 2021): 244. http://dx.doi.org/10.3390/act10090244.

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Twisted polymer fibre actuators provide high torsional rotation from stimulated volume expansion, induced either by chemical fuelling, thermal stimulation, or electrochemical charging. One key limitation of these actuators is the irreversibility of torsional stroke that limits their feasibility when considering real-life smart applications. Moreover, scaling the torsional stroke of these actuators becomes difficult when these are integrated into practically usable systems such as smart textiles, due to the external and variable opposing torque that is applied by the adjacent non-actuating fibres. Herein, a simple composite type torsional actuator made of hydrogel coated commercial textile cotton multifilament fibre is demonstrated. This novel actuator is of high moisture responsiveness, given that hydrogels are capable of providing huge volume expansion and twisting the overall system can transform the volumetric expansion to fibre untwisting based torsional actuation. Theoretical treatment of torsional actuation is also demonstrated based on the change in torsional stiffness of dry and wet fibres as well as a few externally applied torques. The agreement between experimental measurements and theoretical estimation is found reasonable, and the investigation allows the near-appropriate estimation of torsional stroke before integrating an actuator into a smart system.

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Lloyd, George M., Kwang J. Kim, A. Razani, and Mohsen Shahinpoor. "Investigation of a Solar-Thermal Bio-mimetic Metal Hydride Actuator." Journal of Solar Energy Engineering 125, no. 1 (January 27, 2003): 95–100. http://dx.doi.org/10.1115/1.1531147.

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Metal hydrides have been investigated for use in a number of solar thermal energy applications, such as heat regenerators or hydrogen storage technology, but rarely for thermal actuators. Preliminary experimental results from a prototype solar thermal metal hydride actuator, using copper-encapsulated porous metal hydride compacts of LaNi5, indicate that this thermal-mechanical system can produce high specific forces (over 100 (N/g)), with response times on the order of seconds. These operational characteristics, along with features such as being bio-mimetic, compact, operationally safe, lubricationless, noiseless, soft actuating, and environmentally benign, result in an actuator that is ideal for many industrial, space, defense, and biomedical applications. In this paper, we report recent work directed toward predicting and characterizing the performance bounds of the actuator, specifically concentrating on elements which might comprise an actuator driven by concentrated solar radiation. A complete solution of the 1-D governing heat and mass transfer equations with an ideally selective reactor surface are used to predict bounds on performance in terms of volume flow rates and realistic actuation times. The advantages and disadvantages of the design are discussed from this perspective. The preliminary data show a great potential for these metal hydride actuators to be used for solar thermo-mechanical applications.

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Motzki, Paul. "Efficient SMA Actuation—Design and Control Concepts." Proceedings 64, no. 1 (November 21, 2020): 20. http://dx.doi.org/10.3390/iecat2020-08520.

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The versatility of the form factors of thermal shape memory alloys (SMA) in combination with their unique actuation and sensing abilities allow for the design and construction of innovative multifunctional systems. Despite the considerable number of advantages, such as their exceptional energy density, only a few SMA-based actuator systems are commercially available. One of the main reasons for this is their inefficient thermal activation and the resulting high energy consumption. The efficiency of SMA-based actuator systems can be improved by innovative design and control approaches. In the first part of this paper, the intelligent combination of SMA actuator wires with bi-stable, nonlinear spring elements is described. This combination eliminates the commonly quoted disadvantages of SMAs—slow actuation and energy inefficiency—for a wide range of applications. In particular, two energy-free actuator configurations are realized, which can be applied to any non-proportional actuation tasks. The second approach for the realization of high-speed actuation and energy efficiency is the activation of SMA wires with high voltage pulses, which leads to actuation times in the millisecond range and energy savings of up to 80% in comparison to the suppliers’ recommendations. It is shown that even high AC voltages such as typical mains supplies can be directly used for highly efficient SMA activation.

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Oh, Il Kwon, and Dong Hyun Kim. "Frequency Tuning Characteristics of Multi-Layered Micro-Resonators Using Thermal and Piezoelectric Actuation." Key Engineering Materials 324-325 (November 2006): 647–50. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.647.

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Frequency tuning characteristics of the multi-layered micro-resonators have been extensively investigated by using thermal and piezoelectric actuations. Based on the layerwise displacement theory and geometric nonlinear formulation, the nonlinear deformation and its attendant vibration characteristics of un-symmetrically deposited camped-camped micro-beams under piezoelectric and thermal actuations have been analyzed. The effects of the eccentric piezoelectric actuation and uniform thermal loading on the large deflection and natural modes were discussed with respect to geometric nonlinear responses and initial imperfection. Present results show that both piezoelectric and thermal actuations can effectively tune the resonant frequencies as increasing and decreasing desired values by the alternative selection of the dominance between in-plane deformation and out-of-plane deformation.

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Almadani, Ibrahim Khalil, Ibrahim Sufian Osman, and Nasir Ghazi Hariri. "In-Depth Assessment and Optimized Actuation Method of a Novel Solar-Driven Thermomechanical Actuator via Shape Memory Alloy." Energies 15, no. 10 (May 22, 2022): 3807. http://dx.doi.org/10.3390/en15103807.

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Currently, energy demand is more significant than ever due to population growth and advances in recent technologies. In order to supply more energy while maintaining a healthy environment, renewable energy resources are employed. This paper proposes a novel solar-driven shape memory alloy thermomechanical actuator as an eco-friendly solution for solar thermal applications. The proposed actuator was assessed numerically and experimentally. The numerical tests showed that the designed actuation mechanism’s inner temperature has a minimum variation per day of about 14 °C and a temperature variation of 19 °C for most days of the year, which allows for proper activation and deactivation of the actuator. As for the experimental tests, the presented actuation mechanism achieved a bi-directional force of over 150 N, where the inner temperatures of the actuator were recorded at about 70.5 °C while pushing forces and 28.9 °C while pulling forces. Additionally, a displacement of about 127 mm was achieved as the internal temperature of the actuator reached 70.4 °C. The work presented adds to the body of knowledge of a novel solar-based self-driven actuation mechanism that facilitates various applications for solar thermal systems.

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Pal, Jitendra, Yong Zhu, Jun Wei Lu, and Dzung Viet Dao. "A Novel Bidirectional Z-Shaped Thermally Actuated RF MEMS Switch for Multiple-Beam Antenna Array." Advanced Materials Research 705 (June 2013): 264–69. http://dx.doi.org/10.4028/www.scientific.net/amr.705.264.

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In this paper RF MEMS switchis designed for dielectric-embedded electronically switched multiple-beam (DE-ESMB) antenna array. To achieve small stiffness without buckling, a novel bidirectional Z-shaped thermal actuator is used instead of V-shaped thermal actuator, which can generate large displacement and high contact force at low actuation voltage. With the actuation current from-0.6 A to 0.6 A, the electrothermal actuator can achieve a bidirectional motion in a dynamic range of-10.08 μm to 10.17 μm.RF performances are improved by suspending the structure 25 μm from the substrate using MetalMumps process. An ON state insertion loss of-0.14 dB at 10 GHz and an OFF state isolation of-67 dB at 10 GHz are achieved on low resistivity silicon substrate.

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Cartolano, Mark, Boxi Xia, Aslan Miriyev, and Hod Lipson. "Conductive Fabric Heaters for Heat-Activated Soft Actuators." Actuators 8, no. 1 (January 21, 2019): 9. http://dx.doi.org/10.3390/act8010009.

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We examine electrically conductive fabrics as conductive heaters for heat-activated soft actuators. We have explored various fabric designs optimized for material properties, heat distribution and actuation/de-actuation characteristics of the soft actuators. We implemented this approach in the silicone/ethanol composite actuators, in which ethanol undergoes a thermally-induced phase change, leading to high actuation stress and strain. Various types of conductive fabrics were tested, and we developed a stretchable kirigami-based fabric design. We demonstrate a fabric heater that is capable of cyclic heating of the actuator to the required 80 °C. The fabric with the special kirigami design can withstand temperatures of up to 195 °C, can consume up to 30 W of power, and allows the actuator to reach >30% linear strain. This technology may be used in various systems involving thermally-induced actuation.

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Yun, Sungryul, Seongcheol Mun, Seung Koo Park, Inwook Hwang, and Meejeong Choi. "A Thermo–Mechanically Robust Compliant Electrode Based on Surface Modification of Twisted and Coiled Nylon–6 Fiber for Artificial Muscle with Highly Durable Contractile Stroke." Polymers 14, no. 17 (August 31, 2022): 3601. http://dx.doi.org/10.3390/polym14173601.

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In this paper, we propose a novel and facile methodology to chemically construct a thin and highly compliant metallic electrode onto a twisted and coiled nylon–6 fiber (TCN) with a three–dimensional structure via surface modification of the TCN eliciting gold–sulfur (Au–S) interaction for enabling durable electro–thermally–induced actuation performance of a TCN actuator (TCNA). The surface of the TCN exposed to UV/Ozone plasma was modified to (3–mercaptopropyl)trimethoxysilane (MPTMS) molecules with thiol groups through a hydrolysis–condensation reaction. Thanks to the surface modification inducing strong interaction between gold and sulfur as a formation of covalent bonds, the Au electrode on the MPTMS–TCN exhibited excellent mechanical robustness against adhesion test, simultaneously could allow overall surface of the TCN to be evenly heated without any significant physical damages during repetitive electro–thermal heating tests. Unlike the TCNAs with physically coated metallic electrode, the TCNA with the Au electrode established on the MPTMS–TCN could produce a large and repeatable contractile strain over 12% as lifting a load of 100 g even during 2000 cyclic actuations. Demonstration of the durable electrode for the TCNA can lead to technical advances in artificial muscles for human–assistive devices as well as soft robots those requires long–term stability in operation.

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Lee, Taik Min, Young Ho Seo, Kyung Hyun Whang, and Doo Sun Choi. "Study on the Lateral Piezoelectric Actuator with Actuation Range Amplifying Structure." Key Engineering Materials 326-328 (December 2006): 289–92. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.289.

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A novel piezoelectric micro-actuator with actuating range amplification structure has been proposed. This actuator is unique in that the leverage type amplification structure enables large actuating movement with low voltage. In case of general piezoelectric thin film actuator, applied voltage is low and almost zero power is consumed. Its switching time is very fast in comparison with electrostatic actuators and thermal actuators. However, the most drawback of piezoelectric actuator is short actuating range. A 100μm length PZT actuator can only make movement of 100. In this research, we suggest an actuator which can provide geometric amplification of the PZT strain displacement in lateral direction. The lateral piezoelectric MEMS actuator was fabricated and its actuating range was measured. The actuator shows maximum lateral displacement of 1.1μm, and break-down-voltage of the thin film PZT actuator is above 16V.

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Дисертації з теми "Actuation thermale"

Razzaq, Wasif. "Microfluidic spinning of polymer microfibers : effect of operating parameters on morphology and properties towards the development of novel and smart materials." Thesis, Strasbourg, 2022. http://www.theses.fr/2022STRAE004.

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Le filage microfluidique est une technologie émergente pour la production de micro/nanofibres qui ont un fort potentiel pour des applications telles que l’ingénierie tissulaire, l’électronique portable, les systèmes de délivrance de principes actifs et la collecte des eaux. En filage microfluidique, des fibres de diamètres et morphologies contrôlée peuvent être obtenues en manipulant précisément le débit des fluides et la géométrie du dispositif microfluidique. Le but de ce projet doctoral est de développer une expertise et des compétences dans le domaine du filage microfluidique pour produire des fibres polymères par photopolymérisation sous irradiations UV à partir de monomères en utilisant un dispositif microfluidique à base de capillaires avec les objectifs suivants : (1) la mise en place d’une relation empirique pour prédire le diamètre des fibres en prenant en compte les différents paramètres opératoires et de matériaux, (2) la production de fibres Janus/Hecate à partir de monomères ayant différentes propriétés chimiques et physiques avec un contrôle des propriétés morphologiques et mécaniques qui ont été exploitées pour adsorber simultanément des colorants chargés positivement ou négativement, mais aussi pour préparer des actuateurs à partir de fibres Janus thermorépondantes, et (3) le développement d’une approche de modification de surface des fibres pendant leur production
Microfluidic spinning is an emerging technology to produce micro/nanofibers which have a significant potential in advanced applications such as tissue engineering, wearable electronics, drug delivery, and water harvesting. In microfluidic spinning, fibers with controlled diameters and morphologies could be easily produced by precisely manipulating the fluids flow and the geometry of the microfluidic device. The purpose of this doctoral project was to develop expertise and skills in the field of microfluidic spinning to produce polymer fibers using UV photopolymerization of the monomers using a capillary-based microfluidic device with the following objectives : (1) the development of an empirical relationship to predict the fiber diameter considering the different operating and materials parameters, (2) the production of Janus/Hecate fibers from monomers with different chemical and physical properties with controllability of morphological and mechanical properties that were explored to remove simultaneously cationic and anionic dyes and to prepare thermoresponsive Janus fiber actuators, and (3) the development of an in-process rapid surface modification approach to modify the surface of fibers

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Miralles, Vincent. "Migration of biphasic systems by thermal actuation in microconfinement." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066365/document.

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Cette thèse propose deux applications originales du contrôle de la température dans des microsystèmes, abordant des problématiques d'hydrodynamique et de matière molle.Dans une première partie, nous nous intéressons au contrôle du drainage de mousses 2D en confinement micrométrique par effet Marangoni. Pour ce faire, nous appliquons un gradient de température constant à une mousse bidimensionnelle confinée dans une cellule de Hele-Shaw, et observons que l'effet thermocapillaire induit génère un écoulement surfacique capable de contre-balancer le drainage gravitaire naturel. L'équation de conservation de la masse permet de définir des temps caractéristiques inhérents à chacun de ces effets, aboutissant au contrôle du drainage dans notre système modèle.Dans une seconde partie, nous développons une méthode polyvalente pour la microfluidique digitale, basée sur l'effet thermomécanique. Cet effet consiste à chauffer localement un matériau déformable (i.e. du PDMS), dont la dilatation est mise à profit pour réaliser toutes les opérations élémentaires de microfluidique digitale, telles que la génération de gouttes, leur mise en mouvement, piégeage, stockage, tri, brisure ... notre méthode étant opérationnelle pour des gouttes d'eau dans l'huile ou d'huile dans l'eau
This thesis offers two original applications involving temperature control in microsystems, dealing with hydrodynamics and soft matter. The first part focuses on the drainage control of 2D microfoams by Marangoni effect. To this end, we apply a constant temperature gradient throughout a 2D foam confined in a Hele-Shaw cell, and observe that the induced thermocapillary stress is strong enough to counterbalance and even overcome the natural effect of gravity drainage. The mass conservation in the cell leads to the definition of characteristic drainage times inherent to each effect at play, paving the way to the accurate control of the drainage dynamics in our model system.In a second part, we develop a versatile technology for digital microfluidics, based on thermomechanical effect. This effect consists in locally heating a deformable material (i.e. PDMS), which dilation is used to perform all the elementary operations encountered in digital microfluidics, such as droplet generation, motion, storage, sorting, splitting ... our technology being effective for both oil-in-water and water-in-oil droplets

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Baker, Michael S. "On-Chip Actuation of Compliant Bistable Micro-Mechanisms." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/52.

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Two compliant bistable micro-mechanisms have been developed which can be switched in either direction using on-chip thermal actuation. The energy storage and bistable behavior of the mechanisms are achieved through the elastic deflection of compliant segments. The pseudo-rigid-body model was used for the compliant mechanism design, and for analysis of the large-deflection flexible segments. To achieve on-chip actuation, the mechanism designs were optimized to reduce their required rotation, allow them to be switched using linear-motion thermal actuators. The modeling theory and analysis are presented for several design iterations. Each iteration was successfully fabricated and tested using either the MUMPs or SUMMiT surface micromachining technology.

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Wilcox, Daniel L. "Fully Compliant Tensural Bistable Mechanisms (FTBM) with On-Chip Thermal Actuation." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd526.pdf.

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Lammers, Zachary A. "Thermal Management of Electromechanical Actuation System for Aircraft Primary Flight Control Surfaces." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1399021324.

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Smith, Byron Fitzgerald. "Development and Characterization of a Mechanically Prestressed Piezoelectric Composite." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/869.

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Piezoelectric composites have been investigated for use in a variety of areas, including flow control, structural control, energy harvesting, and fuel ignition systems. While many of the investigations conducted in these areas have utilized traditional piezo actuation systems, such as unimorphs or stack actuators, a growing number of research groups are examining the increased performance derived from the mechanical advantage, and enhanced domain rotation, found in prestressed unimorph designs. Prestressed devices, like Thunder® and LIPCA, have been shown well suited for a number of applications; however, the price associated with these devices can often prevent them from being implemented. In an effort to produce a low cost unimorph device that possesses a performance-enhancing curved form, the present investigation presents a novel technique for manufacturing prestressed piezoelectric actuators that are capable of meeting the same high displacement and load bearing capabilities exhibited by conventional prestressed devices. The newly proposed mechanically prestressed composite device, or MPC, is similar in form and function to well-documented thermally prestressed devices like Thunder®. However, rather than deriving its characteristic curved form from a thermally induced stress, the present class of devices relies on the resorting force incited in the piezoelectric ceramic upon adhesion to a mechanically deformed substrate to provide both the performance-enhancing prestress and final form of the device. To aid in refinement of the newly proposed design, beam theory was used to model the stress developed within the device. The model allowed designers to investigate the limitations imposed on the performance-enhancing curved form of the device by the stresses developed in the ceramic as a result of the curvature. Findings derived from the model were experimentally verified before a finalized design was specified for the composite, and a number of devices were manufactured. An initial characterization of the device was carried out based on the composite's response to mechanical and electrical loading. By determining the slope of the electrically and mechanically induced displacement response of the device, the investigation was able to define the center displacement constant and effective spring constant of the unimorph. These parameters not only allow designers to predict the displacement that will occur in response to a given electric field or tensile load, but also to allow for comparison with various devices. In the present investigation, the performance characteristics of mechanically prestressed composites were assessed as a function of substrate thicknesses and adhesive properties. With composites constructed using substrates approximately 9.2cm in length, devices were found to have typical center displacement constants on the order of 1.59 to 7.78kV/mm2 while retaining an effective stiffness between 4.5 to 7.5N/mm. These values were found to be similar to the .71 to 3.85kV/mm2 center displacement constants demonstrated by similarly sized and shaped Thunder® devices, which posses an effective stiffness in the range of 10 to 16.3N/mm. A comprehensive presentation of the test methods and procedures used to determine these values, along with other performance characteristics, are provided.

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Minav, Tatiana, Luca Papini, and Matti Pietola. "A Thermal Analysis of Direct Driven Hydraulics." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200125.

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This paper focuses on thermal analysis of a direct driven hydraulic setup (DDH). DDH combines the benefits of electric with hydraulic technology in compact package with high power density, high performance and good controllability. DDH enables for reduction of parasitic losses for better fuel efficiency and lower operating costs. This one-piece housing design delivers system simplicity and lowers both installation and maintenance costs. Advantages of the presented architecture are the reduced hydraulic tubing and the amount of potential leakage points. The prediction of the thermal behavior and its management represents an open challenge for the system as temperature is a determinant parameter in terms of performance, lifespan and safety. Therefore, the electro-hydraulic model of a DDH involving a variable motor speed, fixed-displacement internal gear pump/motors was developed at system level for thermal analysis. In addition, a generic model was proposed for the electric machine, energy losses dependent on velocity, torque and temperature was validated by measurements under various operative conditions. Results of model investigation predict ricing of temperature during lifting cycle, and flattened during lowering in pimp/motor. Conclusions are drawn concerning the DDH thermal behavior.

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Lott, Christian D. "Electrothermomechanical Modeling of a Surface-micromachined Linear Displacement Microactuator." BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/306.

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The electrothermomechanical characteristics of an electrically-heated polycrystallinesilicon microactuator are explored. Using finite-difference techniques, an electrothermal model based on the balance of heat dissipation and heat losses is developed. For accurate simulation, the relevant temperature dependent properties from the microactuator material are included in the model. The electrothermal model accurately predicts the steady-state power required to hold position, and the energy consumed during the thermal transient. Thermomechanical models use the predictions of temperature from the electrothermal solution to calculate displacement and force from pseudo-rigid-body approximations and commercial finite-element code. The models are verified by comparing experimental data to simulation results of a single leg-pair on a particular configuration of the device. The particular microactuator studied is called a Thermomechanical In-plane Microactuator, or TIM, and was fabricated with surface micromachining technology. A TIM requires a single releasable structural layer, is extremely flexible in design, and can operate with simple drive and control circuitry. The TIM produces linear motion of a center shuttle when slender legs on either side move the shuttle as a result of constrained thermal expansion. In a single example, when the current through a leg with dimensions 250×3×3.5 µm^3 and suspended 2 µm off the substrate is sufficient to maintain an average temperature of 615 C in air and vacuum environments, model simulated temperatures along the leg have a peak of 860 C in air and 1100 C in vacuum. The final measured and predicted displacement is 14 µm. In air, the power predicted by the model needed to maintain this average temperature profile is 95 mW while consuming 16.4 µJ in 0.22 ms to reach 90 percent of the final average temperature. In a vacuum, only 6.4 mW are required to maintain the same average temperature with 97.6 µJ consumed in 18.5 ms. Simulation results suggest that short-duration high-current pulses can improve the transient response and energy consumed in a vacuum when steady-state temperatures are not required. For a TIM leg with the dimensions above, the maximum measured force is approximately 47 µN per leg-pair when enough current is provided to move the TIM 8 µm as a result of ohmic heating and thermal expansion.

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Cragun, Rebecca. "Thermal Microactuators for Microelectromechanical Systems (MEMS)." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/54.

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Microactuators are needed to convert energy into mechanical work at the microscale. Thermal microactuators can be used to produce this needed mechanical work. The purpose of this research was to design, fabricate, and test thermal microactuators for use at the microscale in microelectromechanical systems (MEMS). The microactuators developed were tested to determine the magnitude of their deflection and estimate their force. Five groups of thermal microactuators were designed and tested. All of the groups used the geometrically constrained expansion of various segments to produce their deflection. The first group, Thermal Expansion Devices (TEDs), produced a rotational displacement and had deflections up to 20 µm. The second group, Bi-directional Thermal Expansion Devices (Bi-TEDs) were similar to the TEDs. The difference, as the name implies, was that the Bi-TEDs deflected up to 6 µm in two directions. Thermomechanical In-plane Micromechanisms (TIMs) were the third group tested. They produced a linear motion up to 20 µm. The fourth group was the Rapid Expansion Bi-directional Actuators (REBAs). These microactuators were bi-directional and produced up to 12 µm deflection in each direction. The final group of thermal microactuators was the Joint Actuating Micro-mechanical Expansion Systems (JAMESs). These thermal microactuators rotated pin joints up to 8 degrees. The thermal microactuators studied can be used in a wide variety of applications. They can move ratchets, position valves, move switches, change devices, or make connections. The thermal microactuator groups have their own unique advantages. The TIMS can be tailored for the amount of deflection and output force they produce. This will allow them to replace some microactuator arrays and decrease the space used for actuation. The Bi-TEDs and REBAs are bi-directional and can possibly replace two single direction micro-actuators. The JAMESs can be attached directly to a pin joint of an existing mechanism. These advantages allow these thermal microactuator groups to be used for a wide variety of applications.

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Messenger, Robert K. "Modeling and Control of Surface Micromachined Thermal Actuators." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd434.pdf.

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Частини книг з теми "Actuation thermale"

Ashida, Fumihiro. "Piezoelectric Actuation: Control of Thermal Stress." In Encyclopedia of Thermal Stresses, 3718–28. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_325.

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Adali, Sarp, Ismail Kucuk, and Ibrahim S. Sadek. "Piezoelectric Actuation: Control of Linear Thermal Vibrations." In Encyclopedia of Thermal Stresses, 3713–18. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_318.

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Ashida, Fumihiro. "Piezoelectric Actuation: Adaptive Control of Thermal Displacement." In Encyclopedia of Thermal Stresses, 3690–701. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_322.

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Ashida, Fumihiro. "Piezoelectric Actuation: Control of Linear Thermal Displacement." In Encyclopedia of Thermal Stresses, 3701–13. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_323.

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Du, Chunling, and Chee Khiang Pang. "Control of Thermal Microactuator-Based, Dual-Stage Actuation Systems." In Multi-Stage Actuation Systems and Control, 33–45. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis: CRC Press, 2018. http://dx.doi.org/10.1201/9781351062183-3.

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Ananthasuresh, G. K. "Synthesis Methods for Electro-Thermal Actuation." In Microsystems, 79–119. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0487-0_4.

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Nagelberg, Sara. "Thermal Actuation of Bi-Phase Droplets." In Dynamic and Stimuli-Responsive Multi-Phase Emulsion Droplets for Optical Components, 71–82. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53460-8_5.

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Chattoraj, N., Abhijeet Pasumarthy, Rajeev Agarwal, and Asifa Imam. "Investigation of Microgripper Using Thermal Actuator." In Proceedings of the International Conference on Microelectronics, Computing & Communication Systems, 259–69. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5565-2_23.

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Urayama, Kenji. "Thermal and Electrical Actuation of Liquid Crystal Elastomers/Gels." In Soft Actuators, 289–306. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6850-9_16.

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Lu, Wei-Yang, Ernest J. Garcia, Helena Jin, and Bo Song. "Performance Studies of A Prototypical MEMS Thermal Actuator." In MEMS and Nanotechnology, Volume 2, 203–8. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8825-6_29.

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Тези доповідей конференцій з теми "Actuation thermale"

Piratla, Sarvani, and Amit Lal. "Micro thermal actuator aided micro ultrasonic motor actuation." In 2012 IEEE International Ultrasonics Symposium. IEEE, 2012. http://dx.doi.org/10.1109/ultsym.2012.0067.

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Zhu, Yong. "A New Electrothermal Microactuator With Z-Shaped Beams: Design and Operation." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38611.

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A new class of thermal microactuators, Z-shaped thermal actuator, is introduced in comparison with the well-established V-shaped thermal actuator. Though they share many features in common, Z-shaped thermal actuator offers several advantages: compatibility with anisotropic etching, smaller feature size, larger displacement, and larger variety of stiffness and output force. While the Z-shaped thermal actuator was modeled analytically and verified by multiphysics finite element analysis (FEA), the beam width and length of the central beam were identified as the major design parameters in tuning the device displacement, stiffness, stability and output force. Experimental measurements were taken on three arrays of Z-shaped thermal actuator with variable parameters. Results agreed well with the finite element analysis. The development of Z-shaped thermal actuator is applicable in simultaneous sensing and actuating applications. During the quasi-static test of individual Z-shaped thermal actuator, the average temperature in the device structure was estimated based on electric resistivity at each actuation voltage.

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Lin, Chun-Ying, Tsung-Ying Tsai, and Jin-Chen Chiou. "Design, fabrication and actuation of thermal actuating XY stage." In 2011 IEEE 4th International Nanoelectronics Conference (INEC). IEEE, 2011. http://dx.doi.org/10.1109/inec.2011.5991776.

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Lloyd, George, Kwang J. Kim, A. Razani, and Mohsen Shahinpoor. "Investigation of a Solar-Thermal Bio-Mimetic Metal Hydride Actuator." In ASME Solar 2002: International Solar Energy Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/sed2002-1066.

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Metal hydrides have been investigated for use in a number of solar thermal energy applications, such as heat regenerators or hydrogen storage technology, but rarely for thermal actuators. Preliminary experimental results from a prototype solar thermal metal hydride actuator, using copper-encapsulated porous metal hydride compacts of LaNi5, indicate that this thermal-mechanical system can produce high specific forces (over 100 (N/g)), with response times on the order of seconds. These operational characteristics, along with features such as being bio-mimetic, compact, operationally safe, lubricationless, noiseless, soft actuating, and environmentally benign, result in an actuator that is ideal for many industrial, space, defense, and biomedical applications. In this paper, we report recent work directed toward predicting and characterizing the performance bounds of the actuator, specically concentrating on elements which might comprise an actuator driven by concentrated solar radiation. A complete solution of the 1D governing heat and mass transfer equations with an ideally selective reactor surface are used to predict bounds on performance in terms of volume flow rates and realistic actuation times. The advantages and disadvantages of the design are discussed from this perspective. The preliminary data show a great potential for these metal hydride actuators to be used for solar thermo-mechanical applications.

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Shaikh, Ahmad, Shardul Panwar, Ryohei Tsuruta, and Umesh Gandhi. "Effect of Coating on the Continuous Cycle Actuation of Shape Memory Alloy Wires: Analyses and Experiments." In ASME 2022 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/smasis2022-90983.

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Abstract We develop a finite element methodology to characterize the effects of silicone coating on Shape Memory Alloy (SMA) actuators during continuous actuation cycles. Slow cooling rates of thermally actuated SMA actuators have long been a hurdle for their widespread adoption. The use of a thermally conductive silicone coating provides a potential solution that improves cooling rates without much impact on the actuator thermal performance under single actuation. However, the effects of the coating on the thermal performance under cyclic actuation is unexplored. To verify the finite element model results, various thicknesses between 0.2 mm to 2.5 mm of the coating material were applied to 0.5 mm diameter SMA wires using a specially fabricated coating machine. The results of finite element models were first compared with and calibrated against experimentally measured thermal performance for single actuation cycle. Next, the actuation responses of the numerical models of these coated SMA wires are determined for multiple actuation cycles.

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Lin, Chun-Ying, Tsung-Ying Tsai, Jin-Chen Chiou, and Chin-Ping Chien. "Design, fabrication and actuation of 4-axis thermal actuating image stabilizer." In 2011 IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2011. http://dx.doi.org/10.1109/nems.2011.6017327.

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Li, Jun, and G. K. Ananthasuresh. "Microfabrication and Characterization of Electro-Thermal-Compliant Micro Devices." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/mech-14118.

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Abstract Electro-Thermal-Compliant (ETC) micro devices are a new class of compliant mechanisms that elastically deform in response to Joule-heating induced constrained thermal expansion. In ETC devices, the mechanism and the actuator are indistinguishable and therefore it is called embedded actuation. This type of actuation is attractive for Micro-Electro-Mechanical Systems (MEMS) where the actuator is often much larger than the mechanism and the mechanical coupling of the actuator and mechanism leads to additional difficulties. In this paper, we focus on thin, planar, appropriately shaped, deformable structures made of a conducting material to fabricate micro mechanisms with embedded actuation. We have developed a bulk micromachining process, called PennSOIL, using silicon-on-insulator (SOI) wafers to make silicon ETC devices, and also combined PennSOIL with excimer laser micromachining to make ETC devices with not only silicon but also a variety of metals. The experimental measurements are compared with the theoretical predictions. Test-structures are used to characterize the process and the resulting materials properties some of which are strongly temperature-dependent and process-dependent. The experimental results using the materials properties obtained from the test structures show agreement with the theoretical results.

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Tra´vni´cˇek, Zdeneˇk, and Va´clav Tesarˇ. "An Annular Impinging Jet Alternated by Pulse-Modulated Synthetic Jets." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44128.

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The present experimental study focuses on a generation and control of annular impinging jets. The used working fluid is air. An active flow control system is designed with six radial synthetic jets, which are generated by a common actuator located in the central body of the annular nozzle. The synthetic jets are pulse-modulated. Flow visualization and measurements of the wall pressure and wall heat transfer have been performed. Two flowfield steady patterns A and B (small or large recirculation bubbles, respectively) are recognized. The pattern B exists without the actuation, the unmodulated actuation causes the flowfield switching into the pattern A, and the pulse-modulated actuation generates an alternating flowfield. The present results indicate that the area of higher heat transfer can be slightly spread by means of flow alternation. However, the penalty for this slight gain is a substantial reduction of the heat transfer in the central area.

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Lin, Cheng-Hsuan, Cheng-Chi Yeh, Chen-Peng Hsu, and Wensyang Hsu. "Design and Fabrication of a Cascaded Electro-Thermal Bimorph Actuator." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79854.

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Here a cascaded bimorph actuator is proposed by integrating several novel actuation units to accumulate the vertical displacements. Each actuation unit comprises two types of bimorph beams and a constraint bar, and both beams will stretch outward with respect to the constraint bar while heating. In comparison with other three conventional bimorph actuator designs at the same device size, it is shown that the proposed design can provide larger vertical displacement. The proposed cascaded bimorph actuator is fabricated by surface micromachining technique and released by XeF2 silicon isotropic etching. Whole suspended structure consisting of the polysilicon and the aluminum is around 510 × 400 μm2 with four actuation units. The resistance is about 650 Ω. In testing, the fabricated device is shown to provide reversible vertical displacement of 22.5 μm at 4.5 V, and the operating temperature is measured by an infrared thermal microscope (InfraScope II, QFI). The calibrated maximum temperatures are compared with simulated results by ANSYS 6.0 in good agreement. It is found that the maximum temperature is 147 °C when the input voltage is 4.5 dc volts, and the maximum temperature is below 400°C even at 10 V. However, it is found that the residual stress in the suspended structure will affect the vertical displacement of the device.

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Tsai, Chien-Chung, Tsa-Hsien Yang, and Yi-Chao Huang. "Investigation of actuation behavior for microarray thermal actuator based upon electrical analysis." In MOEMS-MEMS Micro & Nanofabrication, edited by Albert K. Henning. SPIE, 2005. http://dx.doi.org/10.1117/12.589574.

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Звіти організацій з теми "Actuation thermale"

Gallis, Michail A., John Robert Torczynski, Edward Stanley Piekos, Justin Raymond Serrano, Allen D. Gorby, and Leslie Mary Phinney. Validation of thermal models for a prototypical MEMS thermal actuator. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/942182.

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