Literatura académica sobre el tema "Fin actuation systems"
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Artículos de revistas sobre el tema "Fin actuation systems"
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Yoo, Chung-Hee. "Active Control of Aeroelastic Vibrations for Electromechanical Missile Fin Actuation Systems". Journal of Guidance, Control, and Dynamics 40, n.º 12 (diciembre de 2017): 3299–306. http://dx.doi.org/10.2514/1.g002821.
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Haq, Mazhar Ul, Zhao Gang, Zhuang Zhi Sun y S. M. Aftab. "Torque Analysis of IPMC Actuated Fin of a Micro Fish like Device Using Two-Way Fluid Structure Interaction Approach". Journal of Biomimetics, Biomaterials and Biomedical Engineering 25 (octubre de 2015): 25–38. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.25.25.
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In this paper, a numerical simulation of three dimensional model of IPMC actuated fin of a fish like micro device is presented using two-way fluid structure interaction approach. The device is towed by the surface vessel through a tow cable. Fin is acting as dorsal fin of the fish to control depth of the device and also acts as a stabiliser against its roll motion. Fin's displacement disturbs water flow streamlines around it, as a result velocity and pressure profile of fluid's domain changes around the actuated fin. As fin's position continuously changes throughout its actuation cycle, this makes it transient structural problem coupled with a fluid domain. Fin's displacement is received by the fluid and resulting fluid forces are received by the fin making it a two-way fluid structure interaction (FSI) problem. Such problems are solved by multi field numerical simulation approach. This multifield numerical simulation is performed in ANSYS WORKBENCH by coupling transient structural and Fluid Flow (CFX) analysis systems. It is desirous to determine the torque acting on the fin due to fluid forces through its actuation cycle by IPMC actuators. The objective of this study is to develop the methodology (two-way fluid structural interaction (FSI)) used to simulate the transient FSI response of the IPMC actuated fin, subjected to large displacement against different flow speeds. Efficacy of fin as depressor and riser is also required to be judged by monitoring the forces acting on wing in response to its displacement under IPMC actuation. Same approach is also applicable to the self-propelled systems.
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Wiguna, Tedy, Seok Heo, Hoon Cheol Park y Nam Seo Goo. "Mechanical Design of Biomimetic Fish Robot Using LIPCA as Artificial Muscle". Key Engineering Materials 326-328 (diciembre de 2006): 1443–46. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1443.
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This paper presents a mechanical design of biomimetic fish robot using the Lightweight Piezo-Composite Actuator (LIPCA). We have designed a mechanism for converting actuation of the LIPCA into caudal fin movement. The linkage mechanism consists of rack-pinion and four-bar linkage systems. Two kinds of caudal fins are fabricated such that the shapes resemble subcarangiform and ostraciiform caudal fin shape, respectively, and then attached to the linkage system. The swimming test using 300 Vpp input with 1 Hz to 3 Hz frequency was conducted to investigate the effect of tail beat frequency and shape of caudal fin on the swimming speed. The maximum swimming speed was reached when the device was operated at its natural swimming frequency. At the natural swimming frequency of 1.016 Hz, maximum swimming speeds were 1.267 cm/s and 1.041 cm/s for ostraciiform and subcarangiform caudal fin, respectively. The Strouhal numbers, which are a measure of thrust efficiency, were also calculated in order to examine thrust performance of the present biomimetic fish robot.
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Haq, Mazhar Ul, Zhao Gang, Zhuang Zhi Sun y S. M. Aftab. "Force Analysis of IPMC Actuated Fin and Wing Assembly of a Micro Scanning Device through Two-Way Fluid Structure Interaction Approach". International Journal of Engineering Research in Africa 21 (diciembre de 2015): 19–32. http://dx.doi.org/10.4028/www.scientific.net/jera.21.19.
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In this paper, a methodology is presented to perform force analysis of wing and fin assembly of a micro fish like device through strongly coupled two-way fluid structure interaction approach. The scanning device operates underwater and is towed by a surface vessel through a tow cable. Device fins are actuated by ionic polymer metal composite (IPMC) actuators, an EAP actuator. Fins act as riser, depressor and stabiliser against roll motion of the device. During tow, wing and fin assembly of the device come under hydrodynamic forces. These forces are influenced by fin displacement under IPMC actuation and wing's angle of attack for same towing conditions. To fully investigate wing and fin assembly performance, we must consider the interaction between their structure and fluid (water) and model the coupling mechanism accurately for fluid structure interaction (FSI) analysis. To obtain an accurate prediction to the hydrodynamic forces on wing and fin assembly of the device, it is necessary to conduct dynamic analysis of the surrounding fluid by computational fluid dynamics (CFD). A numerical simulation of three dimensional model of the assembly is performed in ANSYS WORKBENCH by coupling transient structural and Fluid Flow (CFX) analysis systems. The objectives of this study are as follows: 1) To build an accurate three-dimensional CFD model of the wing and IPMC actuated fin 2) To quantify the lift and drag forces acting on the wing and their corresponding coefficients 3) To demonstrate the influence of wing's angle of attack and fin displacement on generation of lift and drag forces. The presented methodology is also applicable to self-propelled micro robots.
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Nitzsche, F., D. G. Zimcik, T. G. Ryall, R. W. Moses y D. A. Henderson. "Closed-Loop Control Tests for Vertical Fin Buffeting Alleviation Using Strain Actuation". Journal of Guidance, Control, and Dynamics 24, n.º 4 (julio de 2001): 855–57. http://dx.doi.org/10.2514/2.4788.
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Xie, Ou, Qixin Zhu, Lin Shen y Kun Ren. "Kinematic study on a self-propelled bionic underwater robot with undulation and jet propulsion modes". Robotica 36, n.º 11 (30 de julio de 2018): 1613–26. http://dx.doi.org/10.1017/s0263574718000590.
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SUMMARYThis paper proposed a novel type of bionic underwater robot (BUR). The undulation and jet propulsion modes on the self-propelled BUR were combined, and the kinematic characteristics of the two propulsion modes were thoroughly compared. First, the prototype and swimming strategy of the BUR were presented, and a dynamic model of the BUR was established based on several assumptions. Then, a central pattern generator (CPG) model allowing free adjustment of frequency and amplitude was employed to achieve the undulation propulsion of carangiform fish and the jet propulsion of jellyfish. Also, the kinematic characteristics of the two propulsion modes were investigated through experiments under different caudal fin actuation parameters. The experimental results indicate that the developed prototype can realize the undulation and jet propulsion by the means of the coordinated movement of the multi-caudal fins. By adjusting the CPG parameters, the BUR can switch the propulsion mode smoothly. Furthermore, the propulsion velocity of the BUR initially increased rapidly with the frequency and then slowed down when the frequency was greater than 0.8 Hz in both propulsion modes. The undulation propulsion velocity increased with the amplitude in the measurement ranges, however, the jet propulsion velocity initially increased quickly with the amplitude and then kept constant and even decreased when the amplitude was greater than 11 cm. Under the same caudal fin actuation parameters, the average velocity in undulation propulsion mode was higher than that in jet propulsion mode.
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Karaağaçlı, Taylan y H. Nevzat Özgüven. "Experimental Identification of Backbone Curves of Strongly Nonlinear Systems by Using Response-Controlled Stepped-Sine Testing (RCT)". Vibration 3, n.º 3 (7 de septiembre de 2020): 266–80. http://dx.doi.org/10.3390/vibration3030019.
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In stepped-sine testing of strongly nonlinear structures with the classical force-control strategy, corrective force perturbations of a standard controller used to capture the reference signal in the proximity of turning points of frequency response curves may often lead to a premature jump before reaching the actual resonance peak. Accordingly, a classical force-control approach is not suitable to identify backbone curves of strongly nonlinear structures. This paper shows that currently available commercial modal test equipment can accurately identify backbone curves of strongly nonlinear structures by using Response-Controlled stepped-sine Testing (RCT) and the Harmonic Force Surface (HFS) concept, both recently proposed by the authors. These methods can be applied to systems where there are many nonlinearities at several different (and even unknown) locations. However, these techniques are not applicable to systems where internal resonances occur. In RCT, the displacement amplitude of the driving point, rather than the amplitude of the applied force, is kept constant during the stepped-sine testing. Spectra of the harmonic excitation force measured at several different displacement amplitude levels are used to build up a smooth HFS. Isocurves of constant amplitude forcing on the HFS lead to constant-force frequency response curves with accurately measured turning points and unstable branches (if there are any), which makes it possible to identify backbone curves of strongly nonlinear structures experimentally. The validation of the proposed approach is demonstrated with numerical and experimental case studies. A five degree-of-freedom (DOF) lumped system with five cubic stiffness elements, which create strong conservative nonlinearity, is used in the numerical example. Experimental case studies consist of a cantilever beam and a control fin actuation mechanism of a real missile structure. The cantilever beam is supported at its free-end by two metal strips constrained at both ends to create strong stiffening nonlinearity. The control fin actuation mechanism exhibits very complex and strong nonlinearity due to backlash and friction.
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Xie, Ou, Boquan Li y Qin Yan. "Computational and experimental study on dynamics behavior of a bionic underwater robot with multi-flexible caudal fins". Industrial Robot: An International Journal 45, n.º 2 (19 de marzo de 2018): 267–74. http://dx.doi.org/10.1108/ir-06-2017-0122.
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Purpose This paper aims to develop a novel type of bionic underwater robot (BUR) with multi-flexible caudal fins. With the coordinate movement of multi-caudal fins, BUR will combine the undulation propulsion mode of carangiform fish and jet propulsion mode of jellyfish together organically. The use of Computational Fluid Dynamics (CFD) and experimental method helps to reveal the effect of caudal fin stiffness and motion parameters on its hydrodynamic forces. Design/methodology/approach First, the prototype of BUR was given by mimicking the shape and propulsion mechanism of both carangiform fish and jellyfish. Besides, the kinematics models in both undulation and jet propulsion modes were established. Then, the effects of caudal fin stiffness on its hydrodynamic forces were investigated based on the CFD method. Finally, an experimental set-up was developed to test and verify the effects of the caudal fin stiffness on its hydrodynamic forces under different caudal fin actuation frequency and amplitude. Findings The results of this paper demonstrate that BUR with multi-flexible caudal fins combines the hydrodynamic characteristics of undulation and jet propulsion modes. In addition, the caudal fin with medium stiffness can generate larger thrust force and reduce the reactive power. Practical implications This paper implies that robotic fish can be equipped with both undulation and jet propulsion modes to optimize the swimming performance in the future. Originality/value This paper provides a BUR with multi-propulsion modes, which has the merits of high propulsion efficiency, high acceleration performance and overcome the head shaken problem effectively.
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Muralidharan, M. y I. A. Palani. "Development of Subcarangiform Bionic Robotic Fish Propelled by Shape Memory Alloy Actuators". Defence Science Journal 71, n.º 1 (1 de febrero de 2021): 94–101. http://dx.doi.org/10.14429/dsj.71.15777.
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In this paper, a shape memory alloy (SMA) actuated subcarangiform robotic fish has been demonstrated using a spring based propulsion mechanism. The bionic robotic fish developed using SMA spring actuators and light weight 3D printed components can be employed for under water applications. The proposed SMA spring-based design without conventional motor and other rotary actuators was able to achieve two-way shape memory effect and has reproduced the subcarangiform locomotion pattern. The positional kinematic model has been developed and the dynamics of the proposed mechanism were analysed and simulated using Automated Dynamic Analysis of Mechanical Systems (ADAMS). An open loop Arduino-relay based switching control has been adopted to control the periodic actuation of the SMA spring mechanism. The undulation of caudal fin in air and water medium has been analysed. The caudal fin and posterior body of the developed fish prototype have taken part in undulation resembling subcarangiform locomotion pattern and steady swimming was achieved in water with a forward velocity of 24.5 mm/s. The proposed design is scalable, light weight and cost effective which may be suitable for underwater surveillance application.
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Curet, Oscar M., Neelesh A. Patankar, George V. Lauder y Malcolm A. MacIver. "Aquatic manoeuvering with counter-propagating waves: a novel locomotive strategy". Journal of The Royal Society Interface 8, n.º 60 (22 de diciembre de 2010): 1041–50. http://dx.doi.org/10.1098/rsif.2010.0493.
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Many aquatic organisms swim by means of an undulating fin. These undulations often form a single wave travelling from one end of the fin to the other. However, when these aquatic animals are holding station or hovering, there is often a travelling wave from the head to the tail, and another moving from the tail to the head, meeting in the middle of the fin. Our study uses a biomimetic fish robot and computational fluid dynamics on a model of a real fish to uncover the mechanics of these inward counter-propagating waves. In addition, we compare the flow structure and upward force generated by inward counter-propagating waves to standing waves, unidirectional waves, and outward counter-propagating waves (i.e. one wave travelling from the middle of the fin to the head, and another wave travelling from the middle of the fin to the tail). Using digital particle image velocimetry to capture the flow structure around the fish robot, and computational fluid dynamics, we show that inward counter-propagating waves generate a clear mushroom-cloud-like flow structure with an inverted jet. The two streams of fluid set up by the two travelling waves ‘collide’ together (forming the mushroom cap) and collect into a narrow jet away from the cap (the mushroom stem). The reaction force from this jet acts to push the body in the opposite direction to the jet, perpendicular to the direction of movement provided by a single travelling wave. This downward jet provides a substantial increase in the perpendicular force when compared with the other types of fin actuation. Animals can thereby move upward if the fin is along the bottom midline of the body (or downward if on top); or left–right if the fins are along the lateral margins. In addition to illuminating how a large number of undulatory swimmers can use elongated fins to move in unexpected directions, the phenomenon of counter-propagating waves provides novel motion capabilities for systems using robotic undulators, an emerging technology for propelling underwater vehicles.
Tesis sobre el tema "Fin actuation systems"
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Olcer, Tuncay Ugurlu. "H2/h". Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615636/index.pdf.
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In fin actuation systems, the performance of classical linear control systems is not satisfactory due to uncertainty of the system parameters and disturbances of the working medium. For this reason, sliding mode, H2 or H&infinrobust controllers are widely used in literature for such systems. However, use of such controllers results in very conservative system responses. Based on this fact, in this thesis, development of a more effective robust controller is aimed via integration of the optimum properties of the existent pure H2 and H&infin
type robust controllers. To achieve this, during the controller synthesizing procedure, some of the optimization parameters are weighted according to H2 norm minimization, and parameter uncertainties and other variables are weighted according to H&infin
theorem. First, the system set up to be controlled is physically constructed and performed system identification processes. Then, two different types of robust controllers H2 and H&infin
controllers are designed and tested over both the real system and simulation. Finally an H2/H&infin
mixed type controller synthesized and the results are compared with the outputs of the robust controllers of the previous step.
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Kannan, Suresh Kumar. "Adaptive Control of Systems in Cascade with Saturation". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7566.
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This thesis extends the use of neural-network-based model reference adaptive control to systems that occur as cascades. In general, these systems are not feedback linearizable. The approach taken is that of approximate feedback linearization of upper subsystems whilst treating the lower-subsystem states as virtual actuators. Similarly, lower-subsystems are also feedback linearized. Typically, approximate inverses are used for linearization purposes. Model error arising from the use of an approximate inverse is minimized using a neural-network as an adaptive element. Incorrect adaptation due to (virtual) actuator saturation and dynamics is avoided using the Pseudocontrol Hedging method. Using linear approximate inverses and linear reference models generally result in large desired pseudocontrol for large external commands. Even if the provided external command is feasible (null-controllable), there is no guarantee that the reference model trajectory is feasible. In order to mitigate this, nonlinear reference models based on nested-saturation methods are used to constrain the evolution of the reference model and thus the plant states. The method presented in this thesis lends itself to the inner-outer loop control of air vehicles, where the inner-loop controls attitude dynamics and the outer-loop controls the translational dynamics of the vehicle. The outer-loop treats the closed loop attitude dynamics as an actuator. Adaptation to uncertainty in the attitude, as well as the translational dynamics, is introduced, thus minimizing the effects of model error in all six degrees of freedom and leading to more accurate position tracking. A pole-placement approach is used to choose compensator gains for the tracking error dynamics. This alleviates timescale separation requirements, allowing the outer loop bandwidth to be closer to that of the inner loop, thus increasing position tracking performance. A poor model of the attitude dynamics and a basic kinematics model is shown to be sufficient for accurate position tracking. In particular, the inner-outer loop method was used to control an unmanned helicopter and has subsequently been applied to a ducted-fan, a fixed-wing aircraft that transitions in and out of hover, and a full-scale rotorcraft. Experimental flight test results are also provided for a subset of these vehicles.
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Hsieh, Chia-Hsing y 謝佳興. "Study of a Radial-flow Multiple Magnetically Coupled Fan System with One Piezoelectric Actuator". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/y7nqwm.
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碩士國立臺灣大學
機械工程學研究所
105
With manufacturing process advancements, the size of electronic devices keeps shrinking, which results in a higher heat flux. To maintain a desirable lifetime and good performance for electronic devices, it is necessary to maintain the operating temperature below a certain threshold. Traditional cooling techniques might be unsuitable for next generation electronic devices. Therefore, innovative cooling techniques must be developed. Piezoelectric fans and their feasibility of cooling electronic devices have been widely studied. However, there are few studies that address using a single piezoelectric actuator to generate radial air flow. In this study, a radial-flow multiple fan system was developed. This system only used one piezoelectric actuator and a magnetic repulsive force to activate up to 20 fans, which featured low power consumption and a large cooling area. To find the optimal design for the RMFS, the influence of some geometric parameters was investigated. Besides, the performance of different designs was compared with commercially available axial fan. The results showed that the design E had the best thermal performance among the designs because of its relatively large frequency and amplitude. The thermal resistance and the percentage improvement under a 35 W heat flux were 0.86 K/W and 36.9 %, respectively. In addition, a coefficient of performance (COP) was defined. The COP of design E was approximately 3.5 times that of the rotary fan. For the power consumption aspect, the RMFS is more efficient than the rotary fan.
Libros sobre el tema "Fin actuation systems"
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Schmidt, Robert Kyle. The Design of Aircraft Landing Gear. SAE International, 2021. http://dx.doi.org/10.4271/9780768099430.
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The aircraft landing gear and its associated systems represent a compelling design challenge: simultaneously a system, a structure, and a machine, it supports the aircraft on the ground, absorbs landing and braking energy, permits maneuvering, and retracts to minimize aircraft drag. Yet, as it is not required during flight, it also represents dead weight and significant effort must be made to minimize its total mass. The Design of Aircraft Landing Gear, written by R. Kyle Schmidt, PE (B.A.Sc. - Mechanical Engineering, M.Sc. - Safety and Aircraft Accident Investigation, Chairman of the SAE A-5 Committee on Aircraft Landing Gear), is designed to guide the reader through the key principles of landing system design and to provide additional references when available. Many problems which must be confronted have already been addressed by others in the past, but the information is not known or shared, leading to the observation that there are few new problems, but many new people. The Design of Aircraft Landing Gear is intended to share much of the existing information and provide avenues for further exploration. The design of an aircraft and its associated systems, including the landing system, involves iterative loops as the impact of each modification to a system or component is evaluated against the whole. It is rare to find that the lightest possible landing gear represents the best solution for the aircraft: the lightest landing gear may require attachment structures which don't exist and which would require significant weight and compromise on the part of the airframe structure design. With those requirements and compromises in mind,The Design of Aircraft Landing Gear starts with the study of airfield compatibility, aircraft stability on the ground, the correct choice of tires, followed by discussion of brakes, wheels, and brake control systems. Various landing gear architectures are investigated together with the details of shock absorber designs. Retraction, kinematics, and mechanisms are studied as well as possible actuation approaches. Detailed information on the various hydraulic and electric services commonly found on aircraft, and system elements such as dressings, lighting, and steering are also reviewed. Detail design points, the process of analysis, and a review of the relevant requirements and regulations round out the book content. The Design of Aircraft Landing Gear is a landmark work in the industry, and a must-read for any engineer interested in updating specific skills and students preparing for an exciting career.
Capítulos de libros sobre el tema "Fin actuation systems"
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Hošek, Jan. "Design and Measurement of the Peltier Cell Thermal Actuator for Fine Adjustment". En International Conference on Reliable Systems Engineering (ICoRSE) - 2021, 46–53. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83368-8_5.
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Masoomi, Sayyed Farideddin, Stefanie Gutschmidt y XiaoQi Chen. "State of the Art in Biomimetic Swimming Robots". En Advances in Computational Intelligence and Robotics, 118–52. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7387-8.ch006.
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The presence of marine tasks demands investments on design and development of underwater robots. Among those robots, biomimetic swimming robots have shown superior performance since they are efficient in cruising, highly manoeuvrable, and noiseless during swimming. Accordingly, so far a number of fish robots with distinguished capabilities have been fabricated around the globe. The difference of the existing fish robots roots in their unlike but optimal nature of swimming. Hence, in order to design fish robots, the swimming characteristics of real fish including swimming mode and body/fin shape must be investigated primarily. Then the appropriate actuation system needs to be selected. This chapter aims at presenting state of the art in robotic fish while introducing their design elements and presenting suitable actuation mechanisms for fish robots. In this chapter, a fish robot is introduced and its design process is discussed as a case study.
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Mitarai, Reiji, Hiroaki Takeishi y Takeshi Sawada. "A Use of the Ultrasonic Motor as a Fine Positioning Actuator". En Robotics, Mechatronics and Manufacturing Systems, 491–96. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-444-89700-8.50081-6.
Texto completoActas de conferencias sobre el tema "Fin actuation systems"
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Hou, Piqi, Zhihang Ye y Zheng Chen. "Bio-Inspired Robotic Fish Propelled by Multiple Artificial Fins". En ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9915.
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With advances in actuation and sensing, smart materials has drawn a growing attention from researchers in under water robotic fish. In this paper, a compact, noiseless, and untethered biomimetic robotic fish propelled by Ionic Polymer-Metal Composite (IPMC) actuators is developed. The robot fish employs two pectoral fins to generate steering and one caudal fin to generate main propulsion. A passive plastic fin is attached to the IPMC beam to enhance propulsion. With multiple IPMC fins, the fish is capable of 2D maneuvering. One small size programmable circuit board is designed for the 2D controllable fish. The Experimental results have shown that the forward-swimming speed can reach up to 1cm/sec and the both left-turning and right turning speed can reach up to 2 rad/sec.
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Zhang, Zhiye, Michael Philen y Wayne Neu. "Development of a Bio-Inspired Artificial Fish Using Flexible Matrix Composite Actuators". En ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1309.
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A bio-inspired prototype fish using the flexible matrix composite (FMC) muscle technology is developed for fin and body actuation. Flexible matrix composite actuators are pressure driven muscle-like actuators capable of large displacements as well as large block forces. An analytical model of the artificial fish using FMC actuators is developed and analysis results are presented. An experimental prototype of the artificial fish having FMC artificial muscles has been completed and tested. Constant mean thrusts have been achieved in the laboratory for a stationary fish for different undulation frequencies around 1 Hz. The experimental results demonstrate that a constant thrust can be achieved through tuning of excitation frequency. Free-swimming results show that the prototype can swim at approximately 0.9 m/s.
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Rana, R. K., N. Johnson, P. Dongare y S. Barve. "Is there a case for emulating a fish or other sea borne creatures for propulsion of underwater vehicles?" En 14th International Naval Engineering Conference and Exhibition. IMarEST, 2018. http://dx.doi.org/10.24868/issn.2515-818x.2018.018.
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Fish and other sea borne creatures have invoked interest in the minds of many professionals to study how they propel themselves in water and whether similar principles can be applied to the design of underwater vehicles. Adopting these principles for propulsion had been a challenge some decades ago, but with the current technological progress in robotics, design analysis, advanced computing, precision manufacturing, 3D printing, sensors, actuation, image processing etc have rekindled an interest in this field, especially in the Indian context. Moreover, with the thrust on development of unmanned autonomous systems, especially for the naval warfare, there is a case for looking at an efficient way to propel such vehicles that can stay underwater for a longer duration, move and navigate faster than those traditionally shaped and propelled by screw propellers or pump jets. This paper looks at some of the basics of fish locomotion; technology trends; examples of the current developments; benefits of emerging technologies, investigate performance of some basic shapes of caudal fin of fish with the help of modern analytical tools such as Computational Fluid Dynamics and the way ahead.
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Park, Dong Il, Soo Hyun Kim y Yoon Keun Kwak. "Analysis of the Weighting Matrix for Load Distribution Using Weighted Pseudoinverse in a Redundantly Actuated System". En ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58404.
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Redundant actuation indicates a situation when there are more actuators than a system’s mobility. A redundant actuated system has many strengths, such as better performance than a non-redundant system, avoiding singularity, reducing impact force using active stiffness control and fault tolerance. However, there are some issues on economic efficiency and minimization of a system, because redundant actuation can use more actuators than non-redundant actuation. Also, in a redundant actuation system, the actuator torque does not have one solution, but rather there are infinite torque sets even though a robot works on the same task. Therefore, it is very important to select a torque distribution method that is suitable for the objectives of the robot. In this paper, we used the weighted pseudoinverse matrix for torque distribution. This method is applied to a five bar link system and the influence of the weighting variables is analyzed. By adjusting the weighting values, we can find the relation between the actuator input and the weighting value and obtain various torque sets in real time. In other words, we find how each actuator torque changes according to the variation of each weighting value and how much the maximum torque reduce for the suggested weighting matrices.
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Gao, Jin, Jia-dong Xu, Wei Gao y Xue-jie Liu. "Fin Actuator System Circuit Design and Simulation". En 2009 IEEE Circuits and Systems International Conference on Testing and Diagnosis. ICTD'09. IEEE, 2009. http://dx.doi.org/10.1109/cas-ictd.2009.4960826.
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Shelan, Sameh Fathey, Mohammed Abozied Hassan, Hossam Hendy y Yehia Zakarya Elhalwagy. "Missile Roll Autopilot Redesign Based Advanced Fin Actuation System Modeling". En 2020 2nd Novel Intelligent and Leading Emerging Sciences Conference (NILES). IEEE, 2020. http://dx.doi.org/10.1109/niles50944.2020.9257900.
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Trabia, Mohamed B., Woosoon Yim y Surya Kiran Parimi. "Fuzzy Logic Control of Projectile Fin Angle Using Piezoelectric Beam Actuator". En ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59452.
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Fin of a subsonic projectile produce maneuvering force and moment that control the rotation angle of a projectile fin during flight. The objective of this paper is to study the feasibility of using piezoelectric actuator and fuzzy logic control to create a smart fin. The fin is rotated by a beam-based piezoelectric actuator, which has an end fixed to the rotation axle of the fine while the other end is pinned at the tip of the fin. A model of the dynamics of the system is obtained using the finite element approach. A fuzzy logic controller for the fin is designed. The membership functions of the fuzzy variables for this controller are determined using a hybrid genetic algorithm. Simulation results show that the proposed controller worked satisfactorily.
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Shetty, Devdas, Claudio Campana, Nikolay Nazaryan y Louis Manzione. "Investigation of New Generation of Ceramic and Single Crystalline Piezo Materials for Helicopter Blade and UAV Actuation". En ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66649.
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A great amount of research is being conducted to incorporate smart material actuators in aerospace applications such as (1) turbo fan engines (2) servo flap actuators for helicopter rotor control. For example, a piezoelectric stack actuator, coupled with mechanical or hydraulic amplification could provide the actuation required for the variable pitch fan system with a potentially higher level of reliability. In addition, piezoelectric actuation system could do so at a lower overall weight. However, there are limitations with existing piezoelectric stack actuators relative to power requirements. Therefore, a new approach has been investigated to improve these characteristics in order for piezoelectric stacks to be a feasible solution for these types of large scale applications. A new configuration involving dielectric, conductor, piezoelectric material in a particular sequence of stack actuation is examined and experimented. A nonlinear lumped parameter model of a piezoelectric stack has been developed to describe the behavior for the purpose of control actuation analysis.
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Ahmed, Saad, Erika Arrojado y Zoubeida Ounaies. "Realization of Origami-Inspired Smart Structures Using Electroactive Polymer (EAP)". En ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9202.
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Robert Lang has brought functionality to origami, the art of paper folding, by developing an extensive series of “action origami” figures. As the name suggests, these figures can perform actions and produce an output motion with the help of manual actuation, unlike traditional origami. For instance, different figures can bite, row, and fly. The goal of this research study is to adapt a few of these action origami figures put forth by Robert Lang to create ‘active’ action origami; these systems, instead of relying on manual actuation for motion, will rely on electro-mechanical actuation. This electro-mechanical actuation will be achieved through the judicious use of an electroactive polymer known as P (VDF-TrFE-CTFE) terpolymer. The terpolymer’s in-plane motion in response to an electric field is converted into bending using a unimorph configuration. This bending motion is exploited to actuate three so-called “action origami” structures: the flapping butterfly, the catapult, and the barking dog. Based on knowledge of the kinematics of the origami structures, multilayered terpolymer actuator is placed strategically on the origami figures with an aim to maximize the resulting actuation motion. In order to understand the behavior, capabilities, and limitations of the terpolymer as an active material, both qualitative and quantitative data are collected from the actuation of these three different action origami structures as a function of number of terpolymer layers, applied electric field and frequency of the applied field. The goal is to find the suitable shapes and crease patterns of the structures as well as the configurations with the terpolymer film to maximize the actuation. These three structures are tested and results show that PVDF-terpolymer is an effective actuator with ability to deform a substrate to a desired shape in the presence of an electric field: the butterfly was able to flap, the mouth of the dog was able to “bark,” and the catapult was able to launch a small ball of paper. Through experimentation, it was determined what parameters affect actuation and furthermore what values of those parameters will maximize the actuation.
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Shetty, Devdas, Claudio Campana y Nikolay Nazaryan. "Modeling and Experimental Evaluation of Monocrystalline Piezoelectric Materials for Electromechanical Actuation". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88301.
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A great amount of research is being conducted to incorporate smart material actuators in aerospace applications such as (1) turbo fan engines (2) servo flap actuators for helicopter rotor control. For example, a piezoelectric stack actuator, coupled with mechanical or hydraulic amplification could provide the actuation required for the variable pitch fan system with a potentially higher level of reliability. In addition, piezoelectric actuation system could do so at a lower overall weight. However, there are limitations with existing piezoelectric stack actuators relative to power requirements in high load applications, resulting heat that is generated due to resistance and internal friction within the piezoelectric materials currently being utilized. Therefore, a new approach has been investigated to improve these characteristics in order for piezoelectric stacks to be a feasible solution for these types of large scale applications. A new configuration involving dielectric, conductor, piezoelectric material in a particular sequence of stack actuation is examined and experimented. This configuration is recommended due to the advantage that the metallic layers will allow creating the equipotential surfaces of the quartz and dielectric layers. This circumstance is very important because, in this case, it will take place instantly changing the electric potential of the surface of the piezoelectric material and the dielectric when the force or voltage applied to the actuator changes instantly. A nonlinear lumped parameter model of a piezoelectric stack has been developed to describe the behavior for the purpose of control actuation analysis.
Informes sobre el tema "Fin actuation systems"
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Burgess, J. S. Analysis of K-1 fan system for replacement of valve actuator, B Plant/Waste Encapsulation and Storage Facility. Office of Scientific and Technical Information (OSTI), enero de 1995. http://dx.doi.org/10.2172/10114574.
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