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检索条件"任意字段=Conference on Mathematics and Control in Smart Structures - Smart Structures and Materials 1997"

共 2782 条记录，以下是1-10 订阅

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MULTIPHYSICAL DESIGN OF A CHAOS GENERATOR 17

MULTIPHYSICAL DESIGN OF A CHAOS GENERATOR

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ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Marschner, Uwe Feldmann, Ute Bakardijev, Petko Rost, Gustav Tech Univ Dresden Inst Semicond & Microsyst Dresden Germany Tech Univ Dresden Inst Control Theory Dresden Germany Martin Andersen Nexo Gymnasium Dresden Germany

ISBN: (纸本)9780791888322

In this paper, an equivalent mechanical chaotic signal generator, based on Chua's circuit, is analyzed using the isomorphy between electrical and mechanical systems using the structuretrue "2nd" analogy. It enables a timefficient behavioral system analysis with the help of well-established network methods without the need for extensive experintal setups. The goal is to identify parameter stets of an equivalent mechanical system leading to a chaotic(1) behavior and vizualize the behavior of such a system by means of a realized electromechanical setup.

关键词： Chua's circuit electromechanical netwoks electromechanical analogy Chaos generator chaotic system

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A MODULAR SOFT SWIMMING ROBOT TO TEACH THE CONCEPTS OF BIO-INSPIRED PROPULSION 17

A MODULAR SOFT SWIMMING ROBOT TO TEACH THE CONCEPTS OF BIO-I...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Yates, Trevor Musgrave, Patrick Univ Florida Gainesville FL 32611 USA

ISBN: (纸本)9780791888322

The relationships governing the kinematics of undulatory swimming are extensively studied, but not well-communicated to the general public and students. This study develops a soft modular bio-inspired undulatory propulsor as a tool for teaching the effects of various design parameters on the kinematics of an undulatory swimmer. The propulsor is designed with interchangeable modules to allow for the control of certain design parameters, including body stiffness, tail length, and actuator position on the body. Through the measurement of a freely-swimming propulsor's average velocity with different body thicknesses, the effects of bending stiffness on the average velocity of the propulsor are observed, and the process for a student to replicate these observations is demonstrated. The efficacy of the propulsor as an educational tool is then evaluated through comparison of the observed relationship with existing results from studies on undulatory propulsion, and this relationship is explained in the context of the governing kinetics and kinematics.

关键词： undulatory swimming Pneu-Net actuators bio-inspired structures science communication

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MULTIFRACTAL ANALYSIS OF PHYSICAL RESERVOIR COMPUTER structures 17

MULTIFRACTAL ANALYSIS OF PHYSICAL RESERVOIR COMPUTER STRUCTU...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Carvajal, Mario A. Pahari, Basanta R. Oates, William S. He, Shan Musgrave, Patrick F. Florida A&M & Florida State Univ Tallahassee FL 32310 USA Univ Florida Gainesville FL USA

ISBN: (纸本)9780791888322

Physical reservoir computers combine sensing physical inputs and information processing in one single component to reduce the delay caused by data transmission. Physical reservoir computing uses the nonlinear dynamics of physical systems to process information and acts as a neural network for machine learning, allowing for prediction of target signals in real-time. This method significantly reduces the amount of computing and time required for the control system to respond to stimuli. The geometry and physical properties of the physical reservoir structure govern the overall performance. The structure must have enough complexity and nonlinearity when stimulated while not descending into unpredictable chaos to maximize its performance. This work investigates the utilization of fractal structures in the physical reservoir computing framework. Fractal structures exhibit self-similarity at different scales and can be characterized using a measure called the fractal dimension. Random fractal structures (multifractals) yield a range of fractal dimensions at different length scales. The multifractal spectrum is a measure used to quantify this variability in fractal dimension. This work aims to tune the physical reservoir computer using the multifractal spectrum to find the optimal range that maximizes the information processing potential of the system.

关键词： Renyi entropy physical reservoir computer multifractals

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NEURAL NETWORK-BASED SENSORLESS control OF A SHAPE MEMORY ALLOY ACTUATOR 17

NEURAL NETWORK-BASED SENSORLESS CONTROL OF A SHAPE MEMORY AL...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Koshiya, Krunal Rizzello, Gianluca Motzki, Paul Ctr Mechatron & Automat Technol ZeMA Saarbrucken Germany Saarland Univ Dept Syst Engn Saarbucken Germany Saarland Univ Dept Syst Engn ZeMA Saarbucken Germany

ISBN: (纸本)9780791888322

Shape memory alloy (SMA) wires can be used as actuators when heated above their austenite finish temperature, as their length reduces because of a phase transformation from martensite to austenite. During phase transformation, changes in electrical properties such as the wire resistance can be correlated to changes in wire length, thus enabling the self sensing operation mode. This effect can be used to implement sensorless closed-loop control, where the mechanical feedback is provided by a position estimation obtained through the wire resistance. Self-sensing-based control has a significant advantage over sensor-based control, as it removes the need of additional electro-mechanical transducers into the control system. Due to strong nonlinearities intrinsic to SMA behavior, the relationship between resistance and wire elongation is often complex and hysteretic, making the practical implementation of self-sensing architectures in SMA rather challenging. In this paper, we present a self-sensing-based control of an SMA wire actuator in which a neural network is used to estimate the displacement by using electrical properties. The estimated displacement is further used as feedback to a PI control system, allowing in turn to implement sensorless closed-loop control on an experimental prototype. The performance of the self-sensing-based PI control is compared to laser sensor based PI control, in which position feedback is provided by a laser sensor.

关键词： SMA actuators Self-sensing closed-loop control sensorless control neural networks embedded control systems

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ADAPTIVE SHOCK control BUMP WITH SHAPE MEMORY ALLOY WIRES ON A MORPHING SPOILER 17

ADAPTIVE SHOCK CONTROL BUMP WITH SHAPE MEMORY ALLOY WIRES ON...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： KUnnecke, Sven Christian Riemenschneider, Johannes Monner, Hans Peter German Aerosp Ctr DLR Inst Lightweight Syst Braunschweig Germany German Aerosp Ctr Inst Lightweight Syst Braunschweig Germany

ISBN: (纸本)9780791888322

Conventional transport aircraft operate under transonic conditions in which the transonic shock leads to an increase in wave drag. Shock control bumps (SCBs) can mitigate the shock strength, leading to reduced drag. Preceding studies show the applicability of adaptive SCBs on morphing spoilers. However, with increasing airflow velocities the shock moves downstream, making it structurally challenging to realize sufficient curvature on the rear spoiler end. In this study, a morphing spoiler is structurally designed to form an adaptive SCB utilizing a shape memory alloy (SMA) actuator. A fiberglass composite structure is constructed to enable a form variable region, sufficiently stiff for handling aerodynamic loads but flexible enough for SMA actuation. To prevent the spoiler trailing edge lifting from the flap during bump deployment, a structural pre- bend is implemented on three regions. However, for SCB crest locations near the spoiler rear end, a strong pre-bend would be required, leading to significant contour deviations and waviness in clean configuration with retracted bump. An additional actuator combined with structural pre-bends can enable more downstream bump crest locations than a single spoiler actuator. Since installation space for this additional actuator may be limited, SMAs are considered in this work. In modeling the two-way effect of the SMA, a simplified methodology is utilized. Despite the observed stress limits within the SMA wire being exceeded, the results demonstrate potential and indicate the possible utility of SMA for adaptive shock control on aircraft spoilers.

关键词： Morphing wing shock control bump morphing spoiler adaptive aircraft

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RESONANCE-OPTIMIZED DIELECTRIC PUMP DEMONSTRATOR WITH SELF-SENSING BASED PRESSURE FEEDBACK 17

RESONANCE-OPTIMIZED DIELECTRIC PUMP DEMONSTRATOR WITH SELF-S...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Baltes, M. Croce, S. Bruch, D. Motzki, P. Ctr Mechatron & Automat Technol Smart Mat Syst Saarbrucken Germany Saarland Univ Dept Syst Engn Saarbrucken Germany

ISBN: (纸本)9780791888322

This paper introduces a method for obtaining pressure feedback in a resonance-optimized dielectric elastomer-based pump, employing a self-sensing approach. Despite their increasing relevance, achieving energy-efficient control and optimized operation within various load ranges remains a significant challenge for dielectric elastomer-based pumps. As a result, dielectric elastomer-based pumps, regardless of their advantages such as silent operation, light weight and cheap base materials, have not yet found use in many everyday applications. In this work, the first step is taken to solve this problem with the help of a self-sensing approach and thus lays the foundation for the design of an energy-efficient control of dielectric elastomer-based pumps. To develop, investigate and validate the self-sensing approach a demonstrator is designed, which operates in resonance under maximum load conditions, thereby ensuring consistent attainment of the target pressure and efficient pump performance in this exact operating point. For lower load pressures, the pump is not yet optimized as the resonance shifts under these conditions, due to a pressure-dependent stiffness change of the entire system. Depending on the target volume, this may result in a longer duration to reach the target pressure with simultaneous increased energy consumption. Solving this issue is the missing step in making dielectric elastomer-based pumps suitable for everyday use. For designing an optimized control strategy across the entire load progression, and the resulting varying system stiffness when building up the target pressure, it is essential to always know the exact pressure at the target volume, as the system stiffness is proportional to this pressure. Conventional pumps have the same issue, which is often solved with the help of external pressure sensors. The target of this work is to exploit the advantages of dielectric elastomers and use their self-sensing capability. With this self-sensing appro

关键词： Dielectric elastomers Dielectric elastomer pump Resonance optimization Self-Sensing Energy efficiency Pressure feedback

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A NOVEL TACTILE FEEDBACK WRISTBAND BASED ON A DIELECTRIC ELASTOMER 17

A NOVEL TACTILE FEEDBACK WRISTBAND BASED ON A DIELECTRIC ELA...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Roth, L. Croce, S. Baltes, M. Nalbach, S. Motzki, P. Saarland Univ Dept Syst Engn Saarbrucken Germany Ctr Mechatron & Automat Technol ZeMA gGmbH Smart Mat Syst Saarbrucken Germany

ISBN: (纸本)9780791888322

smart wearable devices are becoming increasingly popular in daily life due to recent technological advances. They have various applications in the medical field (e.g., heart rate monitoring, blood pressure, blood oxygen), industrial field (e.g., worker assistance, gesture-based process control, recognition of unsafe conditions), and in the field of interactive virtual games (e.g., virtual reality, augmented reality). However, these devices must achieve their goals while meeting human needs during their use, such as wearability and adaptability. They must therefore be flexible, lightweight, and easy to understand with an intuitive interface. To fulfil these requirements, the challenge is to integrate flexible sensors and actuators into common clothing fabrics, minimizing the hardware needed and maximizing the wearer's comfort. In this paper, we present a novel dielectric elastomer (DE)based wearable device that can provide tactile feedback on its wearer. It consists of a pouch-like air pocket with a passive and an active silicone membrane (DE). This pouch or bubble is inflated with air pressure, which acts as the necessary bias mechanism pre-stretching both the passive and the active DE membrane. The device is designed in a way that the passive membrane side of the pouch is in contact with the wearer's skin. In addition, to better understand how the passive membrane affects the overall system behavior, we provide experimental characterization studies on design parameters (i.e., thickness and initial pretension of the passive silicone membrane) for different internal pressure values. This results in the membranes having many layers with no pretension to minimize leakage.

关键词： Dielectric elastomers Wearable device Haptic feedback Tactile sensation Experimental characterization Self-Sensing Actuator Sensor

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FLEXIBLE MATRIX COMPOSITE WAFERS IN smart PROSTHETIC SOCKETS FOR IMPROVED SOCKET COMFORT AND FIT 17

FLEXIBLE MATRIX COMPOSITE WAFERS IN SMART PROSTHETIC SOCKETS...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Hada, Masaki Bailey, Abigail Squibb, Carson Kaluf, Brian Madigan, Michael L. Philen, Michael Virginia Polytech Inst & State Univ Kevin T Crofton Dept Aerosp & Ocean Engn Surge Bldg Rm 118E Blacksburg VA 24061 USA

ISBN: (纸本)9780791888322

Improving comfort is a paramount objective in the design process of a lower- limb prosthetic socket. A common issue with maintaining a comfortable socket fit during the day is that volume changes in the residual limb can result in regions of severe discomfort on the limb. These changes in residual limb volume can occur during both brief and long- term timescales. The objective of this research is to develop smart prosthetic sockets that can adjust for changes in the volume of the residual limb. Flexible Matrix Composites (FMCs) are high performance actuators that exhibit a high mechanical advantage when internally pressurized. FMCs are composed of symmetric layers of carbon fiber surrounding a flexible rubber tube. The actuators are then coiled into custom molds and filled with an elastomer, thus forming the active wafer. While FMCs are typically used for axial actuation, the FMC wafers take advantage of the radial expansion of the actuator to obtain actuation through the thickness of the wafer. Previous research characterized the effect of several design variables on the stiffness and actuation performance of wafer-style FMC actuators. Building upon the previous work, custom FMC wafers are fabricated and integrated into prosthetic sockets, thus forming a smart socket that can accommodate for volume changes. A socket was fabricated with custom wafers designed to target critical regions identified for the participant. An external gas canister and pressure regulation valve was used for precise control of the air pressure within the wafers. The participant was subjected to a physical activity regimen, recording their socket comfort every 150 seconds. The participant's socket comfort score improved using the FMC wafers after actuation.

关键词： Active materials flexible matrix composite actuators prosthetic socket comfort

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EXPERIMENTAL INVESTIGATION INTO PARTICLE DYNAMICS INDUCED BY STEADY-STATE STRUCTURE-BORNE TRAVELING WAVES 17

EXPERIMENTAL INVESTIGATION INTO PARTICLE DYNAMICS INDUCED BY...

引用

ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Rogers, William C. De Silva, W. Ushara O. Albakril, Mohammad, I Texas A&M Univ Qatar Smart Mat & Struct Res Lab Doha Qatar

ISBN: (纸本)9780791888322

Structural wave propulsion is found in nature as a mode of locomotion both on land and in the sea. Wave-driven motion has been investigated as a method of propelling nature-inspired robots as well as transporting materials in manufacturing systems. Among the different ways to generate steady-state structureborne traveling waves (SBTW), the two-mode excitation has been gaining more attention due to its flexibility and robustness. Two-mode excitation generates a traveling wave by exciting a complex operating deflection shape (ODS) and tuning the complexity to produce a pure traveling wave. This complex ODS is generated by exciting with two actuators at the same frequency but with a phase offset. Each actuator generates a standing wave which results from real ODS. The phase offset between these ODS introduces the complexity to the overall waveform and is tuned to produce steady-state SBTW in a finite structure. In SBTW generated using two-mode excitation, the frequency will determine the dominant modes in the wave and the shape of the active area on the plate's surface, while the phase offset primarily influences the quality of the SBTW. Unlike active sink techniques, a control effort is not required for the generation of SBTW with the two-mode excitation, allowing for the control effort to be entirely focused on particle motion. This makes the technique well-suited for particle motion applications. While SBTW generated by two-mode excitation has shown promise for wave-driven propulsion of the structure itself, particle motion driven by such waves has yet to be examined. This paper experimentally investigates wave-driven particle motion, focusing on tracking particle dynamics and correlating it to the velocity field of 2D SBTW. For this purpose, an experimental setup that utilizes GoPro cameras is developed and integrated with real-time image processing techniques. The developed setup is capable of monitoring a particle moving on an excited plate, tracking its trajecto

关键词： Bioinspired Systems Wave-induced Motion Particle Tracking Image Processing

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UTILIZING STEADY-STATE TRAVELING WAVES IN A QUIESCENT WATER ENVIRONMENT FOR PARTICLE PROPULSION 17

UTILIZING STEADY-STATE TRAVELING WAVES IN A QUIESCENT WATER ...

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ASME conference on smart materials, Adaptive structures and Intelligent Systems (SMASIS)

作者： Gupta, Samikhshak Malladi, Vijaya V. N. Sriram Michigan Technol Univ Dept Mech Engn Engn Mech VITAL Struct Grp Houghton MI 49931 USA

ISBN: (纸本)9780791888322

Using steady-state traveling waves as a propulsion mechanism emerges as a highly effective strategy for displacing particles, eliminating the need for an external fluid transfer pump. This experimental inquiry delves into the intricate application of traveling waves within a beam submerged in quiescent water, deploying two distinctive force input methods to govern particle movement acoustically. The complexity of this research lies in balancing the finesse of particle motion while concurrently imposing constraints on the number of control cycles implemented. To address this challenge comprehensively, we introduce a diverse range of control cycles tailored to manipulate particles of varying sizes. Navigating the nuanced dynamics of this system requires a sophisticated approach, prompting the adoption of the Reinforcement Learning Approach. This methodological choice empowers us to discern the characteristics of traveling waves necessary for facilitating the movement of particles with divergent sizes. The utilization of Reinforcement Learning not only refines our understanding of the intricate interplay between waves and particles but also enhances our ability to optimize control strategies in this particular context. The significance of this research extends beyond the confines of the laboratory, resonating in various applications, with particular prominence in advancing transportation mechanisms for cells and analogous entities. By elucidating the underlying principles governing the interaction between traveling waves and particles of different sizes, the findings offer invaluable insights that can be harnessed to optimize particle manipulation techniques. This holds potential implications in biotechnology, where the precision control of particle movement is pivotal for applications ranging from targeted drug delivery to the manipulation of biological cells. Furthermore, our exploration not only contributes to the theoretical understanding of particle manipulation t

关键词： Biotechnology Pumps Waves Biological cells Innovation Drug delivery systems Underpinning Traveling waves Dynamics (Mechanics) Acoustics Particle dynamics Transportation systems Water Reinforcement learning Precision control Particulate matter Cycles Steady state Fluids Propulsion

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