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Magnetic actuators and sensors
\"An accessible, comprehensive guide on magnetic actuators and sensors, this fully updated second edition of Magnetic Actuators and Sensors includes the latest advances, numerous worked calculations, illustrations, and real-life applications. Covering magnetics, actuators, sensors, and systems, with updates of new technologies and techniques, this exemplary learning tool emphasizes computer-aided design techniques, especially magnetic finite element analysis, commonly used by today's engineers. Detailed calculations, numerous illustrations, and discussions of discrepancies make this text an invaluable learning tool for practicing engineers and engineering students\"-- Provided by publisher.
Book
Specchi attivi contactless per telescopi spaziali/Contactless active mirror for space telescopes
Il progetto SPLATT e un'attivita di ricerca tecnologica, finanziata da INAF, nel campo degli specchi primari attivi per telescopi spaziali di prossima generazione. Lo scopo e dimostrare in laboratorio che gli specchi attivi con attuatori contactless sono di fatto insensibili ai disturbi originati dal telescopio e possono essere quindi un elemento chiave per ridurre complessita e costo. Parole chiave: telescopio spaziale, specchio attivo, ottica attiva, LUVOIR. The SPLATT project is a technological research activity funded by INAF, in the field of primary active mirrors for next generation space telescopes. The goal is to demonstrate that active mirrors with contactless actuators are insensitive to disturbance from the telescope and can therefore be key-elements in the reduction of complexity and cost. Keywords: space telescopes, active mirror, active optics, LUVOIR.
Journal Article
Harnessing Nonuniform Pressure Distributions in Soft Robotic Actuators
Fluid‐Driven Elastomer Actuators In article number 2200330, Kirstin H. Petersen and co‐workers present fluidic actuators in which viscous fluids propagate in a scalable framework manifesting control of the structure by the structure, generating pressure distributions within each actuator ‐ achieving interchangeable, spatio‐temporal motions with a single inlet. Through theory and experiments, the article introduces the foundation of a design methodology, unlocking significantly more capable and competitive soft robots.
Journal Article
A Collapsible Soft Actuator Facilitates Performance in Constrained Environments
Stacked Balloon Actuators In article number 2200085, Jacob Rogatinsky, Tommaso Ranzani, and co‐workers introduce a class of soft actuators capable of large deformations despite folding nearly flat when deflated, making them capable to adapt to minimal space conditions without sacrificing the ability to complete dexterous tasks. Such features make them suitable to operate in Complex environments, such as those found in surgical and search‐and‐rescue applications.
Journal Article
Robust Hinfinity fault-tolerant control for stochastic Markov jump time-delay systems with actuator faults and application/Vigase taiturmehhanismiga stohhastiliste ajalise hilistumisega Markovi huppesusteemide robustne Hinfinity veakindel juhtimine ja rakendamine
This paper investigates the robust H[infinity] fault-tolerant controller design under actuator failure for a class of the stochastic Markov jump time-delay systems with parameter uncertainties. The existence condition of the state feedback robust H[infinity] fault-tolerant controller with actuator failure is presented. The robust H[infinity] fault-tolerant control algorithm is derived in the form of linear matrix inequality via the Lyapunov stability theory. The proposed control does not need to estimate the boundary value of an actuator fault, nor does it depend on fault detection and diagnostic devices. By solving the linear matrix inequality, a robust fault-tolerant controller, which makes the closed-loop system asymptotically stable and whose H[infinity] performance is restricted by a given bound, is designed such that its structure is comparably simpler and does not require a large number of calculations. The designed controller is applied to a U AV illustrative example. The numerical results and computer simulation demonstrate the effectiveness of the proposed fault-tolerant control.
Journal Article
Facile Manufacturing Route for Magneto‐Responsive Soft Actuators
Soft Actuators The cover picture illustrates a soft magneto‐responsive gripper that catches a blueberry mid‐flight. The gripper, presented in article number 2000283 by André R. Studart and co‐workers, is made from a silicone composite with strontium ferrite particles and is programmed to actuate under the action of an external magnetic field. It can lift up to 100 times its own weight and fully closes in less than 0.5 seconds.
Journal Article
Actuation of Mobile Microbots: A Review
Maturation of robotics research and advances in the miniaturization of machines have contributed to the development of microbots and enabled new technological possibilities and applications. Microbots have a wide range of applications, including the navigation of confined spaces, environmental monitoring, micro‐assembly and manipulation of small objects, and in vivo micro‐surgeries and drug delivery. Actuators are among the most critical components that define the performance of robots. A comprehensive review of the actuation mechanisms that have been employed in mobile microbots is provided, including piezoelectric, magnetic, electrostatic, thermal, acoustic, biological, chemical, and optical actuation, with a focus on the most recent development and methodologies.
Journal Article
Composition-Driven Ultra-Low Hysteresis Electrostrictive Strain in BaTiOsub.3-BaZrOsub.3-BiOsub.3 Ceramics with High Thermal Stability
High electrostrain, excellent thermal stability, and low hysteresis are critical requirements for advanced high-precision actuators. However, simultaneously achieving these synergistic properties in lead-free ferroelectric ceramics remains a significant challenge. In this work, a targeted B-site doping strategy was employed to develop novel lead-free (0.99-x)BaTiO[sub.3]-xBaZrO[sub.3]-0.01Bi(Zn[sub.2/3]Nb[sub.1/3])O[sub.3] (BT-xBZ-BZN, x = 0–0.2) ceramics. Systematic investigation identified optimal Zr[sup.4+] substitution at x = 0.1, which yielded an outstanding combination of electromechanical properties. For this optimal composition, a high unipolar electrostrain (S [sub.max] = 0.11%) was achieved at 50 kV/cm, accompanied by an ultra-low hysteresis (H [sub.S] = 1.9%). Concurrently, a large electrostrictive coefficient (Q [sub.33] = 0.0405 m[sup.4]/C[sup.2]) was determined, demonstrating excellent thermal robustness with less than 10% variation across a broad temperature range of 30–120 °C. This superior comprehensive performance is attributed to a composition-driven evolution from a long-range ferroelectric to a pseudocubic relaxor state. In this state, the dominant electrostrictive effect, propelled by reversible dynamics of polar nanoregions (PNRs), minimizes irreversible domain switching. These findings not only present BT-xBZ-BZN (x = 0.1) as a highly promising lead-free candidate for high-precision, low-loss actuator devices, but also provide a viable design strategy for developing high-performance electrostrictive materials with synergistic large strain and superior thermal stability.
Journal Article