Relevant bibliographies by topics / Integrated Magnetic Actuation System

Academic literature on the topic 'Integrated Magnetic Actuation System'

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Published: 6 September 2023

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Journal articles on the topic "Integrated Magnetic Actuation System"

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Abdelrahman, Mohammad, and Sang-Young Park. "Integrated attitude determination and control system via magnetic measurements and actuation." Acta Astronautica 69, no. 3-4 (August 2011): 168–85. http://dx.doi.org/10.1016/j.actaastro.2011.03.010.

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Sriramshankar, R., and G. R. Jayanth. "An Integrated Magnetic Actuation System for High-Speed Atomic Force Microscopy." IEEE/ASME Transactions on Mechatronics 23, no. 5 (October 2018): 2285–94. http://dx.doi.org/10.1109/tmech.2018.2857464.

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Joseph, Joel, Makoto Ohtsuka, Hiroyuki Miki, and Manfred Kohl. "Resonant Self-Actuation Based on Bistable Microswitching." Actuators 12, no. 6 (June 13, 2023): 245. http://dx.doi.org/10.3390/act12060245.

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We present the design, simulation, and characterization of a magnetic shape-memory alloy (MSMA) film actuator that transitions from bistable switching to resonant self-actuation when subjected to a stationary heat source. The actuator design comprises two Ni-Mn-Ga films of 10 µm thickness integrated at the front on either side of an elastic cantilever that moves freely between two heatable miniature permanent magnets and, thus, forms a bistable microswitch. Switching between the two states is induced by selectively heating the MSMA films above their Curie temperature Tc. When continuously heating the permanent magnets above Tc, the MSMA film actuator exhibits an oscillatory motion in between the magnets with large oscillation stroke in the frequency range of 50–60 Hz due to resonant self-actuation. A lumped-element model (LEM) is introduced to describe the coupled thermo-magnetic and magneto-mechanical performance of the actuator. We demonstrate that this performance can be used for the thermomagnetic energy generation of low-grade waste heat (T < 150 °C) with a high power output per footprint in the order of 2.3 µW/cm2.
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Razzaq, M. Yasar, M. Behl, and A. Lendlein. "Magneto-Mechanical Actuators with Reversible Stretching and Torsional Actuation Capabilities." MRS Advances 4, no. 19 (2019): 1057–65. http://dx.doi.org/10.1557/adv.2019.123.

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ABSTRACTComposite actuators consisting of magnetic nanoparticles dispersed in a crystallizable multiphase polymer system can be remotely controlled by alternating magnetic fields (AMF). These actuators contain spatially segregated crystalline domains with chemically different compositions. Here, the crystalline domain associated to low melting transition range is responsible for actuation while the crystalline domain associated to the higher melting transition range determines the geometry of the shape change. This paper reports magneto-mechanical actuators which are based on a single crystalline domain of oligo(ω-pentadecalactone) (OPDL) along with covalently integrated iron(III) oxide nanoparticles (ioNPs). Different geometrical modes of actuation such as a reversible change in length or twisting were implemented by a magneto-mechanical programming procedure. For an individual actuation mode, the degree of actuation could be tailored by variation of the magnetic field strengths. This material design can be easily extended to other composites containing other magnetic nanoparticles, e.g. with a high magnetic susceptibility.
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Cheng, Shing Shin, Yeongjin Kim, and Jaydev P. Desai. "Modeling and characterization of shape memory alloy springs with water cooling strategy in a neurosurgical robot." Journal of Intelligent Material Systems and Structures 28, no. 16 (January 24, 2017): 2167–83. http://dx.doi.org/10.1177/1045389x16685443.

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Since shape memory alloy has a high power density and is magnetic resonance imaging compatible, it has been chosen as the actuator for the meso-scale minimally invasive neurosurgical intracranial robot (MINIR-II) that is envisioned to be operated under continuous magnetic resonance imaging guidance. We have devised a water cooling strategy to improve its actuation frequency by threading a silicone tube through the spring coils to form a compact cooling module-integrated actuator. To create active bi-directional motion in each robot joint, we configured the shape memory alloy springs in an antagonistic way. We modeled the antagonistic shape memory alloy spring behavior and provided the detailed steps to simulate its motion for a complete cycle. We investigated the heat transfer during the resistive heating and water cooling processes. Characterization experiments were performed to determine the parameters used in both models, which were then verified by comparing the experimental and simulated data. The actuation frequency of the antagonistic shape memory alloys was evaluated for several motion amplitudes and we could achieve a maximum actuation frequency of 0.143 Hz for a sinusoidal trajectory with 2 mm amplitude. Lastly, we developed a robotic system to implement the actuators on the MINIR-II to move its end segment back and forth for approximately ±25°.
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Qiu, Xianbo, Junhui Zhang, Shisong Gong, Dong Wang, Shan Qiao, Shengxiang Ge, Ningshao Xia, Duli Yu, and Shizhi Qian. "A Single-Bead-Based, Fully Integrated Microfluidic System for High-Throughput CD4+T Lymphocyte Enumeration." SLAS TECHNOLOGY: Translating Life Sciences Innovation 23, no. 2 (October 13, 2017): 134–43. http://dx.doi.org/10.1177/2472630317737016.

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A single-bead-based, fully integrated microfluidic system has been developed for high-throughput CD4+T lymphocyte enumeration at point-of-care testing. Instead of directly counting CD4+T lymphocytes, CD4+T lymphocyte enumeration is achieved by quantitatively detecting CD4 antigen from the lysed blood sample with a functionalized polycarbonate single bead based on chemiluminescence. To implement the sandwiched chemiluminescence immunoassay with reduced nonspecific binding, a streamlined microfluidic chip with multiple reaction chambers is developed to allow each reaction step to be completed in an independent chamber where reagent is pre-stored. With simple magnetic control, the single bead with an embedded ferrous core can be consecutively transported between each of two adjacent chambers for different reactions. Meanwhile, enhanced mixing can be achieved by moving the single bead back and forth inside one chamber with magnetic actuation. High-throughput detection can be performed when a linear actuation stage is adopted to introduce synchronous magnetic control to multiple single beads in parallel microfluidic chips. A sensitive charge-coupled device (CCD) camera is adopted for high-throughput chemiluminescence detection from multiple single beads. Experimental results show that with the fully integrated microfluidic system, easy-to-operate, accurate, low-cost, immediate, and high-throughput CD4+T lymphocyte enumeration can be successfully achieved at resource-poor settings.
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Schlüter, Kathrin, Leonardo Riccardi, and Annika Raatz. "An Open-Loop Control Approach for Magnetic Shape Memory Actuators Considering Temperature Variations." Advances in Science and Technology 78 (September 2012): 119–24. http://dx.doi.org/10.4028/www.scientific.net/ast.78.119.

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Magnetic shape memory alloys (MSMA) offer remarkable potentials for actuation purposes because of a large achievable strain and a short response time. But, apart from these advantages, MSMA show a hysteretic behavior between the input and output quantities. Hysteretic phenomena represent an important challenge for the design of control systems for MSMA-based actuators. Furthermore, this hysteretic behavior is sensitive to temperature variations, a situation that arises in many applications. To face the problem of increasing/decreasing temperature during operation, an open-loop control approach considering temperature variations is presented in this paper. For this purpose, an actuator prototype is characterized with particular emphasis on temperature influence concerning the input-output behavior. The presence of a time-varying nonlinearity is addressed by means of a set of hysteresis models and relative compensators to improve the positioning performance of the actuator system. Subsequently, the obtained models are integrated in the control loop and tested experimentally. Finally, the results achieved with the introduced control concept are presented.
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Hoang, Manh Cuong, Siliang Liu, Kim Tien Nguyen, Han-Sol Lee, Ayoung Hong, Seungmin Bang, Jayoung Kim, Jong-Oh Park, and Chang-Sei Kim. "DEMA: Robotic dual-electromagnet actuation system integrated with localization for a magnetic capsule endoscope." Sensors and Actuators A: Physical 361 (October 2023): 114596. http://dx.doi.org/10.1016/j.sna.2023.114596.

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Du, Xingzhou, and Jiangfan Yu. "Image-Integrated Magnetic Actuation Systems for Localization and Remote Actuation of Medical Miniature Robots: A Survey." IEEE Transactions on Robotics 39, no. 4 (August 2023): 2549–68. http://dx.doi.org/10.1109/tro.2023.3271582.

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Yue, Wenchao, Ruijie Tang, Joei Simin Wong, and Hongliang Ren. "Deployable Tubular Mechanisms Integrated with Magnetic Anchoring and Guidance System." Actuators 11, no. 5 (April 28, 2022): 124. http://dx.doi.org/10.3390/act11050124.

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Deployable mechanism has received more attention in the medical field due to its simple structure, dexterity, and flexibility. Meanwhile, the advantages of the Magnetic Anchoring and Guidance System (MAGS) are further highlighted by the fact that the operators can remotely control the corresponding active and passive magnetic parts in vivo. Additionally, MAGS allows the untethered manipulation of intracorporeal devices. However, the conventional instruments in MAGS are normally rigid, compact, and less flexible. Therefore, to solve this problem, four novel deployable tubular mechanisms, Design 1 (Omega-shape mechanism), Design 2 (Fulcrum-shape mechanism), Design 3 (Archway-shape mechanism), and Design 4 (Scissor-shape mechanism) in this paper, are proposed integrated with MAGS to realize the laser steering capability. Firstly, this paper introduces the motion mechanism of the four designs and analyzes the motion characterization of each structure through simulation studies. Further, the prototypes of four designs are fabricated using tubular structures with embedded magnets. The actuation success rate, the workspace characterization, the force generation and the load capability of four mechanisms are tested and analyzed based on experiments. Then, the demonstration of direct laser steering via macro setup shows that the four mechanisms can realize the laser steering capability within the error of 0.6 cm. Finally, the feasibility of indirect laser steering via a macro-mini setup is proven. Therefore, such exploration demonstrates that the application of the deployable tubular mechanisms integrated with MAGS towards in vivo treatment is promising.
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Dissertations / Theses on the topic "Integrated Magnetic Actuation System"

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Leuschke, Rainer. "Motor integrated actuation for a flywheel energy storage system /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7113.

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Linda, Quazi Tanzil Afroze. "Developing Magnetic resonance elastography (MRE) breast actuation system for detecting breast cancer." Thesis, University of Canterbury. Mechanical Engineering, 2012. http://hdl.handle.net/10092/6575.

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It is well known in medicine that changes in tissue elasticity may be related to pathological phenomena such as cancer and other disease. Physicians routinely use palpation as means of inspecting the thyroid, prostate, and breast, where a palpably hard mass can often indicate the presence of a malignant lesion. Magnetic Resonance Elastography (MRE) has emerged as a relatively new elasticity imaging technique which can be used to spatially map and measure displacement patterns resulting from harmonic shear-wave propagation in soft tissue. Displacement fields are then used in reconstructing the tissue’s elastic property distributions. The feasibility of using MRE as a noninvasive means of characterizing the mechanical properties of silicone phantom mimicking human breast, was investigated though experiments involving MRE acquisitions of four phantoms. To achieve sufficient excitation of the phantom tissue, an acoustic actuator was developed. The results of these studies have shown the MRE acquisition to be successful in capturing sufficient data for elastic parameter reconstruction. Another different type of actuator has been developed and tested in the laboratory. The results show the potential for future use of this actuator in MRE experiments.
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CHOI, JIN-WOO. "MAGNETIC PARTICLE SEPARATORS AND INTEGRATED BIOFILTERS FOR MAGNETIC BEAD-BASED BIOCHEMICAL DETECTION SYSTEM." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990796344.

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Kiermaier, Josef [Verfasser]. "Integrated Nanomagnetic Logic System in Perpendicular Magnetic Media / Josef Kiermaier." Aachen : Shaker, 2014. http://d-nb.info/1049380894/34.

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Stegen, Sascha. "Development of an Integrated Magnetic System Assisted by Electromagnetic Simulation." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/365703.

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In DC/DC converter systems, power electronic circuits are reaching switching efficiencies close to 100 percent nowadays. Thus, most of the energy loss appears inside the passive magnetic circuit of the converter, which at the same time is the component that requires most space in the system. In order to battle this issue, research during the last century has been focused on planarization, hybridization and integration techniques with the goal to achieve higher efficiencies and decrease the profile and volume of the devices. In addition, higher frequencies have been applied to achieve a higher power density of the magnetic systems, but with the negative consequence of stronger parasitic effects such as proximity and skin effects inside the magnetic circuit. This thesis deals with the development of an integrated magnetic system in a L-C-T (Inductor-Capacitor-Transformer) configuration, with the assistance of Finite Element Method (FEM) computer modeling, which is supportively used to accelerate the development process. Computational simulation method is used to indicate and address the physical issues, which cannot be identified with conventional measurement methods.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Bowers, Brian J. (Brian Jeffrey). "Integrated cryogenic refrigeration system design for superconducting magnetic energy storage systems." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42681.

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Munir, Ahsan. "Magnetic Nanoparticle Enhanced Actuation Strategy for mixing, separation, and detection of biomolecules in a Microfluidic Lab-on-a-Chip System." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/289.

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Magnetic nanoparticle (MNP) combined with biomolecules in a microfluidic system can be efficiently used in various applications such as mixing, pre-concentration, separation and detection. They can be either integrated for point-of care applications or used individually in the area of bio-defense, drug delivery, medical diagnostics, and pharmaceutical development. The interaction of magnetic fields with magnetic nanoparticles in microfluidic flows will allow simplifying the complexity of the present generation separation and detection systems. The ability to understand the dynamics of these interactions is a prerequisite for designing and developing more efficient systems. Therefore, in this work proof-of-concept experiments are combined with advanced numerical simulation to design, develop and optimize the magnetic microfluidic systems for mixing, separation and detection. Different strategies to combine magnetism with microfluidic technology are explored; a time-dependent magnetic actuation is used for efficiently mixing low volume of samples whereas tangential microfluidic channels were fabricated to demonstrate a simple low cost magnetic switching for continuous separation of biomolecules. A simple low cost generic microfluidic platform is developed using assembly of readily available permanent magnets and electromagnets. Microfluidic channels were fabricated at much lower cost and with a faster construction time using our in-house developed micromolding technique that does not require a clean room. Residence-time distribution (RTD) analysis obtained using dynamic light scattering data from samples was successfully used for the first time in microfluidic system to characterize the performance. Both advanced multiphysics finite element models and proof of concept experimentation demonstrates that MNPs when tagged with biomolecules can be easily manipulated within the microchannel. They can be precisely captured, separated or detected with high efficiency and ease of operation. Presence of MNPs together with time-dependent magnetic actuation also helps in mixing as well as tagging biomolecules on chip, which is useful for point-of-care applications. The advanced mathematical model that takes into account mass and momentum transport, convection & diffusion, magnetic body forces acting on magnetic nanoparticles further demonstrates that the performance of microfluidic surface-based bio-assay can be increased by incorporating the idea of magnetic actuation. The numerical simulations were helpful in testing and optimizing key design parameters and demonstrated that fluid flow rate, magnetic field strength, and magnetic nanoparticle size had dramatic impact on the performance of microfluidic systems studied. This work will also emphasize the importance of considering magnetic nanoparticles interactions for a complete design of magnetic nanoparticle-based Lab-on-a-chip system where all the laboratory unit operations can be easily integrated. The strategy demonstrated in this work will not only be easy to implement but also allows for versatile biochip design rules and provides a simple approach to integrate external elements for enhancing mixing, separation and detection of biomolecules. The vast applications of this novel concept studied in this work demonstrate its potential of to be applied to other kinds of on-chip immunoassays in future. We think that the possibility of integrating magnetism with microfluidic-based bioassay on a disposable chip is a very promising and versatile approach for point-of care diagnostics especially in resource-limited settings.
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Shihadeh, Fadi Easa. "Optimized and integrated alignment system for functional proton radiosurgery." CSUSB ScholarWorks, 2007. https://scholarworks.lib.csusb.edu/etd-project/3258.

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In this thesis work, a system for proton beam alignment was studied and optimized in many of its functional areas. The resulting system was named Positioning Alignment Control System (PACS). The PACS system is an integrated and efficient system as a result of the work done on it in the course of this thesis work.
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Van, Rensburg Jacques Jansen. "An integrated controller for an active magnetic bearing system / by Jacques Jansen van Rensburg." Thesis, North-West University, 2007. http://hdl.handle.net/10394/2306.

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Zheng, Yi. "Biological Agent Sensing Integrated Circuit (BASIC): A New Complementary Metal-oxide-semiconductor (CMOS) Magnetic Biosensor System." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/48892.

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Fast and accurate diagnosis is always in demand by modern medical professionals and in the area of national defense. At present, limitations of testing speed, sample conditions, and levels of precision exist under current technologies, which are usually slow and involve testing the specimen under laboratory conditions. Typically, these methods also involve several biochemical processing steps and subsequent detection of low energy luminescence or electrical changes, all of which reduce the speed of the test as well as limit the precision. In order to solve these problems and improve the sensing performance, this project proposes an innovative CMOS magnetic biological sensor system for rapidly testing the presence of potential pathogens and bioterrorism agents (zoonotic microorganisms) both in specimens and especially in the environment. The sensor uses an electromagnetic detection mechanism to measure changes in the number of microorganisms--tagged by iron nanoparticles--that are placed on the surface of an integrated circuit (IC) chip. Measured magnetic effects are transformed into electronic signals that count the number and type of organisms present. This biosensor introduces a novel design of a conical-shaped inductor, which achieves ultra-accuracy of sensing biological pathogens. The whole system is integrated on a single chip based on the fabrication process of IBM 180 nm (CMOS_IBM_7RF), which makes the sensor small-sized, portable, high speed, and low cost. The results of designing, simulating, and fabricating the sensor are reported in this dissertation.
Ph. D.
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Books on the topic "Integrated Magnetic Actuation System"

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Riehl, Mark. TMS stimulator design. Edited by Charles M. Epstein, Eric M. Wassermann, and Ulf Ziemann. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780198568926.013.0003.

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Transcranial magnetic stimulators have progressed from basic implementations to integrated systems optimized for treatment of pathologies. This article reviews key factors of design of such clinically targeted systems, discussing design principles, procedure-specific features, and clinical safety requirements. A power source, a capacitor, and a high-power switch controlled by a processor form the basic stimulator. The fundamental operating mechanism of a TMS stimulator is to create a changing magnetic field that can induce a current in adjacent conductive material. The clinical TMS system must incorporate patient positioning, patient comfort, coil positioning features, and intuitive user controls and means of managing patient data to be a fully effective system. The most important safety risk with repetitive TMS reported in the literature is the risk of inducing seizure. Other safety considerations include proper use of human factor analysis to minimize improper operation, the biocompatibility of materials touching the patient, and addressing acoustic noise.
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Benarroch, Eduardo E., Jeremy K. Cutsforth-Gregory, and Kelly D. Flemming. Mayo Clinic Medical Neurosciences. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190209407.001.0001.

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This text is intended to serve as an effective foundation on which to build knowledge in the classroom and at the bedside. Chapters have been ordered to improve the integration of neurochemistry and neuropharmacology with our understanding of the nervous system and to facilitate student grasp of the large sections of knowledge. Major sections are devoted to gross anatomy. The format of each chapter consists of Objectives, Introduction, Overview, and text. Clinical problems have been integrated into the text for self assessment. Detailed additional information has been identified in each chapter for those with a desire to go beyond general knowledge. The need to present the vast array of current knowledge of the nervous system required diagrams of anatomy and histology, including magnetic resonance and computed tomographic images to correlate with basic anatomy. Many concepts are clarified further with figures and the abundant use of color throughout. Sections address the neurologic examination and common disorders for systems and levels, including immunologic and genetic neurologic disorders.
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Book chapters on the topic "Integrated Magnetic Actuation System"

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Liu, Yong, Hakho Lee, Donhee Ham, and Robert M. Westervelt. "CMOS-based Magnetic Cell Manipulation System." In Series on Integrated Circuits and Systems, 103–44. Boston, MA: Springer US, 2007. http://dx.doi.org/10.1007/978-0-387-68913-5_5.

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Priest, E. R., and D. I. Pontin. "Magnetic Reconnection." In The Sun and the Heliosphere as an Integrated System, 397–422. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2831-1_14.

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Dadkhah, Mohammad, Naveen Kumar, and Jungwon Yoon. "Design and Simulation of a 3D Actuation System for Magnetic Nano-Particles Delivery System." In Intelligent Robotics and Applications, 177–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40852-6_20.

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Lehmann, Ulrike, Maximilian Sergio, Emile P. Dupont, Estelle Labonne, Cristiano Niclass, Edoardo Charbon, and Martin A. M. Gijs. "Actuation and Detection of Magnetic Microparticles in a Bioanalytical Microsystem with Integrated CMOS Chip." In Nanosystems Design and Technology, 85–102. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0255-9_4.

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Takayama, Masahiko, Kazusuke Maenaka, and Akihiro Yamamoto. "Position Sensing System Using Integrated Magnetic Sensors and Neural Networks." In Transducers ’01 Eurosensors XV, 76–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59497-7_17.

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Solanki, Sami K. "The Magnetic Field from the Solar Interior to the Heliosphere." In The Sun and the Heliosphere as an Integrated System, 373–95. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2831-1_13.

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Sun, Jinji, Hongliang Ren, and Keyu Wu. "Force Efficient Analysis of a Hybrid Magnetic Actuation System for Minimally Invasive Diagnostics and Interventions." In Inclusive Society: Health and Wellbeing in the Community, and Care at Home, 167–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39470-6_21.

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Deng, Wenyao, Zhao Dong, Jieyu Zhang, and Xuechao Duan. "Binocular Vision System Integrated with Transcranial Magnetic Stimulation Automatic Therapeutic Apparatus." In Lecture Notes in Electrical Engineering, 424–33. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9437-0_45.

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Lomné, Victor, Philippe Maurine, Lionel Torres, Thomas Ordas, Mathieu Lisart, and Jérome Toublanc. "Modeling Time Domain Magnetic Emissions of ICs." In Integrated Circuit and System Design. Power and Timing Modeling, Optimization, and Simulation, 238–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17752-1_24.

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Gizelska, Małgorzata. "Artificial Intelligence in Integrated Diagnostics of the Rotating System with an Active Magnetic Bearing." In Advances in Intelligent Systems and Computing, 455–63. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10990-9_43.

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Conference papers on the topic "Integrated Magnetic Actuation System"

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Lee, Chia-Yen, Zgen-Hui Chen, and Chih-Yung Wen. "An Electromagnetic Actuator in Lab-on-a-Chip Systems." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52037.

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A novel technique for the fabrication of electromagnetic micro actuators was proposed and a prototype was designed and fabricated in this study. The constituent parts of the designed actuator are comprised of the diaphragm, the micro coils, and the magnet. When an electrical current was applied to the micro coils, the magnetic force between the magnet and the coil is produced, causes the diaphragm to deflect and becomes the source of actuation. The fabrication process of the actuator combines Optical Lithography, Electron Beam Evaporation, and Electroplating. The structure of the actuating device uses PDMS as the vibrating diaphragm and electroplated copper as the coils. The diaphragm deflection can be regulated by varying the electrical current passed through the micro coil and hence the actuating effects can be controlled. The experimental results show that the maximum diaphragm deflection within elastic limits is 150 μm at an electrical current of 0.6 A for a micro coil of 100 μm line width. The micro electromagnetic actuator proposed in this study is easily fabricated and is readily integrated with Lab-on-a-Chip systems due to its planar structure.
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von Lockette, Paris. "Fabrication and Performance of Magneto-Active Elastomer Composite Structures." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7590.

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This works discusses the use of magneto-active elastomer (MAE) as an active material for use in origami engineering and other applications where transformation of a composite structure between target shapes is desired. Magneto-active elastomer, as the name implies, consists of magnetic powders dispersed in an elastomer (polymer) fluid which is subsequently cured in the presence of a magnetic field to produce a net remanent magnetization in the cured solid. Having their own internal magnetization, MAE materials are affected by both magnetic forces, due to gradients in local field, as well as magnetic torques resulting from the cross product of the field and the magnetization. In this fashion, patches of MAE material, distributed throughout a non-magnetic elastomeric structure, act as distributed actuators producing deformed shapes. The use of rare-Earth magnets as the magnetic actuation elements is also investigated. The work highlights experimental efforts to develop structures with integrated MAE patches and rare-Earth magnets of varying magnetization orientations using multi-step casting processes and 3D printing techniques. Initial results show success at generating active structures having locally oriented MAE patches and magnets in accordion, water bomb and and Miru fold patterns.
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Panesso, Miguel, D. Rau, Kenny Pagel, Andrea Böhm, and Welf-Guntram Drossel. "Integration of magnetic shape memory alloy actuator in fine boring tool positioning system." In Active and Passive Smart Structures and Integrated Systems XV, edited by Jae-Hung Han, Shima Shahab, and Gang Wang. SPIE, 2021. http://dx.doi.org/10.1117/12.2583067.

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Wong, C. Channy, Douglas R. Adkins, Ronald P. Manginell, Gregory C. Frye-Mason, Peter J. Hesketh, and Thomas Stanczyk. "Development of a Latching Valve for Micro-Chem-Lab™." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0301.

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Abstract An integrated microsystem to detect traces of chemical agents (μChemLab™) is being developed at Sandia for counter-terrorism and nonproliferation applications. This microsystem has two modes of operation: liquid and gas phase detection. For the gas phase detection, we are integrating these critical components: a preconcentrator for sample collection, a gas chromatographic (GC) separator, a chemically selective flexural plate wave (FPW) array mass detector, and a latching valve onto a single chip. By fabricating these components onto a single integrated system (μChemLab™ on a chip), the advantages of reduced dead volume, lower power consumption, and smaller physical size can be realized. In this paper, the development of a latching valve will be presented. The key design parameters for this latching valve are: a volumetric flow rate of 1 mL/min, a maximum hold-off pressure of 40 kPa (6 psi), a relatively low power, and a fast response time. These requirements have led to the design of a magnetically actuated latching relay diaphragm valve. Magnetic actuation is chosen because it can achieve sufficient force to effectively seal against back pressure and its power consumption is relatively low. The actuation time is rapid, and valve can latch in either an open or closed state. A corrugated parylene membrane is used to separate the working fluid from internal components of the valve. Corrugations in the parylene ensure that the diaphragm presents minimum resistance to the actuator for a relativley large deflection. Two different designs and their performance of the magnetic actuation have been evaluated. The first uses a linear magnetic drive mechanism, and the second uses a relay mechanism. Preliminary results of the valve performance indicates that the required driving voltage is about 10 volts, the measured flow rate is about 50 mL/min, and it can hold off pressure of about 5 psi (34 kPa). Latest modifications of the design show excellent performance improvements.
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Ritchie, Erin, and Jeong-Hoi Koo. "Development of Electromagnetic Induction Systems for Powering “Smart” Actuation Systems." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15289.

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The primary goal of this project is to design and test of a novel electromagnetic induction (EMI) system that is capable of converting ambient vibration energy into valuable electric energy for use in powering "smart" actuation systems. The principle of the EMI system is based on the Faraday's Law of Induction: the magnitude of the electromotive force (emf) induced in a circuit is proportional to the rate of change of the magnetic flux that cuts across the circuit. The converted electric energy (i.e., emf) from the EMI system will power a semi-active damping control device called a Magnetorheological (MR) damper. The project has been separated into two phases: (1) Optimal design of EMIs, (2) Performance evaluation of MR-EMIs. To identify an "optimal" EMI configuration, several prototype EMIs were designed and constructed. The performance of each EMI was then experimentally evaluated using a spring-mass system. The effects of the number of turns, coil length, number of phases and type of phase connection of the EMIs were evaluated by comparing maximum output voltages. Analysis of the output voltages revealed that generally increases in the number of turns and the number of phases causes an increase in the output voltage while increases in length caused decreases in voltage. In the second phase of the project, a prototype was built that integrated the EMI systems with an existing MR damper, making an MR-EMI system. The dynamic performance of the MR-EMI was experimentally evaluated using a dynamic force frame and a load cell. The results revealed that the current EMI design generated a force equivalent to that produced by a 2 volt battery.
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Ruffert, Christine, and Hans H. Gatzen. "Design and Technology of a Magnetic Levitation System for Linear Micro Actuators." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34676.

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A major drawback of magnetic linear micro actuators is the vertical attractive force between stator and traveler. In the case of a micro step motor, this force is typically one order of magnitude greater than the driving force itself. To compensate for this undesired vertical force and thus taking full advantage of the driving force available, a magnetic levitation system was developed and implemented as a guide. The electromagnetic field generated by the stator coils interacts with the field of permanent magnets positioned in the traveler. This way, the traveler is elevated. Since repulsive magnetic levitation systems are inherently unstable, a tribological guide was integrated on both sides of the magnetic levitation system. During motion, the combination of stationary coils in the stator and moving permanent magnets in the traveler lifts up the traveler, while the lateral tribological guide prevents the traveler from shifting sideways. Initial investigations proved the feasibility of this magnetic levitation concept (1). A complete linear micro step motor system with magnetic levitation guide consists of the micro step motor itself, the magnetic micro levitation system (including the lateral guides), and a capacitive air gap measurement system. The latter one detects the size of the air gap between stator and traveler of the micro actuator. An assembly consisting of the three components results in a linear micro actuator system with adjustable air gap. For achieving optimal working conditions of the linear micro step motor, the magnetic levitation system was designed for a nominal air gap of 8 μm at the micro step motor. While earlier work proved the feasibility of such a guide, it also indicated (i) that the levitation system has to be capable of correcting a pitch motion of the traveler and (ii) that an as high magnetic levitation force as possible is desirable. To address the first issue, the magnetic levitation system received four coils arranged in a square along the axis of motion of the micro step motor. This way, both pitch and roll may be controlled. For resolving the second issue, the number of coil layers was increased from two to four. The technology for such a four layer coil is quite challenging, particularly since every effort has to be made to minimize its building height. The challenges were resolved by creating a coil system where the lateral insulation between conductors consists of SU-8™ (a photosensitive epoxy by Micro Resist Technology), while the vertical insulation layers were formed by a thin, stress compensated Si3N4 film. This way, a very compact coil with a high conductor-to-insulator ratio and thus a great current conducting capability could be realized. Due to the thin Si3N4 insulation, it also features an excellent thermal conductivity.
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Comber, David B., Jonathon E. Slightam, Eric J. Barth, Vito R. Gervasi, and Robert J. Webster. "Design and Precision Control of an MR-Compatible Flexible Fluidic Actuator." In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4481.

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Magnetic resonance imaging (MRI) offers many benefits to image-guided interventions, including excellent soft tissue distinction, little to no repositioning of the patient, and zero radiation exposure. The closed, narrow bore of a high field MRI scanner limits clinician access to the patient, such that an MR-compatible robot is essentially required for many potential interventions. A robotic system of this kind could additionally provide the clinician increased accuracy and more degrees of freedom within the minimally invasive context. Fluid power is an excellent type of actuation to use inside the MRI scanner, as such actuators can be designed free of magnetic and electrical components. However, there are no fluid power actuators readily available that are suitable for use in the operating room. This paper reports a compact, intrinsically safe, sterilizable fluid power actuator. Using additive manufacturing processes, the actuator was printed in a single build. Thus, it is composed of several integrated parts in a compact design. Employing an inchworm-like behavior, the linear actuator can advance or retract a needle or mechanism rod in discrete steps; thus the device is intrinsically safe. The actuator is fluid agnostic, but a pneumatic prototype is presented here with initial testing results. For the pneumatic case, sub-step positioning control has been tested using a nonlinear, model-based controller, and the mean steady-state error was 0.025 mm. Thus this type of actuator appears to be promising solution for use in MRI-guided interventions.
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Sarmah, Nilakshi, and Rajiv Tiwari. "Experimental Investigation of Active Control of Cracked Rotor-Bearing System Equipped With Magnetic Bearing." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2647.

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Abstract The present work investigates the online vibration control of a cracked rotor-bearing system incorporated with AMB. A fatigue crack, which exhibits the opening and closure behavior of cracked faces while rotation, is introduced artificially in the shaft to understand the dynamic behavior of a cracked rotor system. For this, three-point bending tests were performed to obtain edge transverse crack in the shaft. An eight-pole electromagnetic actuator was used to apply control forces directly on to the shaft in the radial direction. The radial force was used to assist vibration suppression in the rotor. In order to achieve active control to mechanical vibration and other disturbances, a simple PID control strategy is used. Closed loop tests are conducted on the d-SPACE DS1202 platform using the differential driving mode of the PID controller to suppress the vibration of a shaft containing a transverse crack integrated with an AMB supported on two conventional bearings. The comparison of the dynamic behavior of the laboratory test rig with and without active magnetic bearing (AMB) with the numerically simulated data is analyzed. The vibration suppression is found to be achieved satisfactorily in the presence of the unbalance force, bow force, crack force, and with other forces on the rotor-bearing system.
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Jing, Yang, Jianbin Luo, and Tianmin Shao. "Thickness and Processing Effects on the Composition and Actuating Force of Pb(Zr,Ti)O3 Thin-Film Micro-Actuator for Hard Disk Drives." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63316.

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Sol-gel process associated with integrated circuit (IC) technique was used to fabricate Lead-zirconate-titanate (PZT) films with different thickness and process parameter on Pt/Ti/SiO2/Si substrates. Meanwhile, a new dual-stage actuator system including a piezoelectric micro-actuator and a voice coil motor for positioning a magnetic head for high-density hard disc devices (HDDs) have been designed, fabricated. Fig. 1 shows the structure illustration of the micro-actuator that consists of slider, “U”-type substrate and piezoelectric multilayer elements. The crystalline structure and growth behavior of the films with different thickness have been studied by X-ray diffraction, scanning electron microscopy, and Auger electron spectroscopy. The structure of piezoelectric element is as Pt/Ti/PZT/Pt/Ti multi-layer film.
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Abu-Nimeh, Faisal T., and Fathi M. Salem. "CMOS Integrated Electro-magnetic Force Actuator." In 2006 49th IEEE International Midwest Symposium on Circuits and Systems. IEEE, 2006. http://dx.doi.org/10.1109/mwscas.2006.382295.

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