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检索条件"任意字段=Smart Structures and Materials 1994: Mathematics and Control in Smart Structures"

共 544 条记录，以下是441-450 订阅

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SHAPE control OF NITINOL-REINFORCED COMPOSITE BEAMS

SHAPE CONTROL OF NITINOL-REINFORCED COMPOSITE BEAMS

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： BAZ, A CHEN, T RO, J CATHOLIC UNIV AMER DEPT MECH ENGNWASHINGTONDC 20064

ISBN: (纸本)0819414859

The shape of composite beams is controlled by sets of flat strips of a shape memory nickel-titanium alloy (NITINOL). A mathematical model is developed to describe the behavior of this class of smart composites. The model describes the interaction between the elastic characteristics of the composite beams and the thermally- induced shape memory effect of the NITINOL strips. The effect of various activation strategies of the NITINOL strips on the shape of the composite beams is determined. The theoretical predictions of the model are validated experimentally using a fiberglass composite beam made of 8 plies of unidirectional BASF 5216 prepregs which are 9.75-cm wide and 21.20 cm long. The beams are provided with four NITINOL-55 strips which are 1.2 mm thick and 1.25 cm wide. The time response characteristics of the beam are monitored and compared with the corresponding theoretical characteristics. Close agreement is obtained between the theoretical predictions and the experimental results. The obtained results suggest the potential of the NITINOL strips in controlling the shape of composite beams without compromising their structural stiffness.

关键词： Composites Beam shaping Thermal modeling Beam controllers Mathematical modeling Chemical elements Finite element methods Tantalum Iron Thermal effects

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HYSTERESIS PREDICTION FOR PIEZOCERAMIC ACTUATOR SYSTEMS USING PREISACH MODELS

HYSTERESIS PREDICTION FOR PIEZOCERAMIC ACTUATOR SYSTEMS USIN...

引用

Conference on smart materials: smart structures and materials 1994

作者： SREERAM, PN NAGANATHAN, NG UNIV TOLEDO DEPT MECH ENGNTOLEDOOH 43606

ISBN: (纸本)0819414840

Hysteresis is a form of nonlinearity that is present in piezoceramic microactuator systems. A methodology to predict influence of hysteresis on system performance is valuable when these actuators are employed as part of closed loop motion control systems. In this work, an existing phenomenological approach (Preisach models) is investigated for piezoceramic systems. Hysteresis in a piezoceramic system is experimentally documented initially for a bounding operating condition of a cyclic electric potential. The limiting hysteresis loop has a positive turning point of +100 V and a negative turning point of -100 V. Hysteretic behavior for various operating conditions within this bounding loop (i.e. minor hysteresis loops) is then predicted using a moving Preisach model. In addition, hysteresis effects are analytically predicted when a constant mechanical load and a cyclic electric potential are applied simultaneously, using two inputs Preisach model. Experimental data are also presented for the minor hysteresis loops at different positive and negative turning points. Predictions using Preisach models agreed well with the experimental results, particularly when the minor loops are closer to the bounding loop.

关键词： Systems modeling Actuators Mathematical modeling Motion models Ferroelectric materials Microactuators Amplifiers Ferromagnetics Ceramics control systems

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MODAL PARAMETER IDENTIFICATION OF controlLED FLEXIBLE SPACE structures 2

MODAL PARAMETER IDENTIFICATION OF CONTROLLED FLEXIBLE SPACE ...

引用

2nd European Conference on smart structures and materials

作者： KASAI, T KOMATSU, K SANO, M NATL AEROSP LAB CHOFUTOKYO 182JAPAN

ISBN: (纸本)0819417009

A method for using the extended Kalman filter to identify the modal parameters of vibration controlled structures has been developed and demonstrated. The closed-loop structural vibration system is excited by a known of unknown excitation signal and the resulting time histories of the closed-loop systems response are analyzed. The present method has the advantage that the physical parameters of the system are directly estimated. The numerical examples showed excellent results and it is expected that the present method can be applied to the on-orbit modal testing of controlled space structures.

关键词： Filtering (signal processing) Performance modeling smart materials Stochastic processes Complex systems Finite element methods Matrices Numerical simulations Aerospace engineering control systems

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Mathematical model of structures carrying attached or embedded intelligent devices

Mathematical model of structures carrying attached or embedd...

引用

Proceedings of the 35th AIAA/ASME/ASCE/AHS/ASC structures, Structural Dynamics, and materials Conference. Part 1 (of 5)

作者： Allaei, D. QRDC Inc Excelsior MN United States

The recent advances in materials, control applications, and computational methods have led to the development of 'smart' or 'intelligent' structures. The focus of this paper is on the modeling of a structure that carries 'smart' sensors and/or actuators. The approach is based on the combination of the component mode syntheses and the receptance methods. The interfaces between the host structure and the attached smart elements are modeled in the frequency domain. It is shown that the combined method has significant advantages when compared with conventional methods such as FEM.

关键词： Intelligent structures

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SPECIAL CONSIDERATIONS IN THE MODELING OF INDUCED STRAIN ACTUATOR PATCHES BONDED TO SHELL structures

SPECIAL CONSIDERATIONS IN THE MODELING OF INDUCED STRAIN ACT...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： CHAUDHRY, Z LALANDE, F ROGERS, CA VIRGINIA POLYTECH INST & STATE UNIV CTR INTELLIGENT MAT SYST & STRUCTBLACKSBURGVA 24061

ISBN: (纸本)0819414859

Based on the thin-shell Donnel theory, a model to represent the action of discrete induced strain actuator patches bonded to the surface of a circular cylindrical shell has been developed. The model provides estimates of the curvature due to the out-of-phase actuation and the in-plane strains due to the in-phase actuation of the bonded actuator patches. The magnitudes of the induced curvature and the in-plane strain are found to be identical to those of plates; however, due to the cylindrical strain- displacement relations, the in-plane and out-of-plane displacements are coupled. Expressions for the equivalent forces and moments that represent the action of the actuator patches have been developed. Due to the curvature of the shell, the representation of the in-phase actuation with an equivalent in- plane line force applied along the edge of the actuator results in the application of erroneous rigid-body transverse forces. To avoid these rigid body forces, a method to represent the in-phase actuation with a system of self-equilibrating forces is proposed. The action of the actuator is then represented by an equivalent in-plane force and a transverse distributed pressure applied in the region of the actuator patch. Finite element verification of the proposed model is presented. The displacements due to the actual actuator actuation are compared with the proposed model, and very good agreement is found.

关键词： Actuators Finite element methods Neon Systems modeling Acoustics Coastal modeling Intelligence systems Motion models Vibration control Shape memory alloys

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A time domain analysis of active control of sound transmission through an elastic plate backed by a rigid rectangular cavity

A time domain analysis of active control of sound transmissi...

引用

smart structures and materials 1994: mathematics and control in smart structures

作者： Koshigoe, Shozo Ellis, Graham K. Aerospace Corporation P.O. Box 92957 M4/967 Los AngelesCA90009-2957 United States

A time domain model for simulating the noise transmission through an elastic plate into a rigid cavity has been developed. This model is used to study the noise attenuation capability and transient-convergence of the filtered-x LMS feedforward control algorithm. Piezoelectric transducers (PZT's) are considered to be bonded on the elastic plate and are used as actuators in the control scheme. In this study, the fully coupled acoustic-plate interaction equations are solved using time dependent Green's function techniques, where a time varying air mean density is considered. The effects that the time varying mean density has on the transmission of sound and on the stability of the filtered-x LMS adaptive controller are discussed. © 1994 SPIE.

关键词： Time domain analysis

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ACTIVE RESPONSE control USING ROTOR FIN FOR WIND-INDUCED STRUCTURAL VIBRATIONS 2

ACTIVE RESPONSE CONTROL USING ROTOR FIN FOR WIND-INDUCED STR...

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2nd European Conference on smart structures and materials

作者： MUKAI, Y TACHIBANA, E INOUE, Y OSAKA UNIV DEPT ARCHITECTURAL ENGNSUITAOSAKA 565JAPAN

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MACHINE TOOL CHATTER REDUCTION VIA ACTIVE STRUCTURAL control 2

MACHINE TOOL CHATTER REDUCTION VIA ACTIVE STRUCTURAL CONTROL

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2nd European Conference on smart structures and materials

作者： OREGAN, S MIESNER, J AIKEN, R PACKMAN, A UNVER, E AKERLEY, S AT&T Advanced Technology Systems (United States) United Technologies Pratt & Whitney (United States)

A proof of concept for the applicability of active structural control on a Vertical Turning Lathe was demonstrated. The effort proved that active damping can reduce chatter in a production machine tool when machining ... 详细信息

ISBN: (纸本)0819417009

关键词： Actuators Signal processing Nickel Manufacturing Process control smart materials Surface finishing Surface roughness Amplifiers Bandpass filters

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smart piezo stacks as actuators for precision control of adaptive reflectors

Smart piezo stacks as actuators for precision control of ada...

引用

1994 North American Conference on smart structures and materials: smart structures and Intelligent Systems

作者： Duong, Khanh Garcia, Ephrahim Waites, Henry B. Garman Systems Inc. NashvilleTN United States Smart Structures Laboratory Department of Mechanical Engineering Vanderbilt University Box 1592 Station B NashvilleTN37235 United States Controls and Pointing Branch Marshall Space Flight Center United States Vanderbilt University United States

The use of piezoceramics in micro-positioning is increasing tremendously. Deformable and segmented optical reflectors are examples where the micro-positioning is critical to system performance. In addition to correcting for mirror flaws and the effects of gravity, the actuators in adaptive segmented reflectors can constantly correct each of the segmented reflector surfaces to compensate for the disturbances in the atmosphere. This task requires the piezoceramic actuator, used to position the mirror, which operates over a large bandwidth with very high resolution. However, the hysteresis associated with piezoceramics hampers its application in optical micro-positioning where nanometer resolution and wide bandwidth is required. Clearly, there is a need to compensate for these hysteretic effects to make piezoceramics more suitable for such high resolution applications. This paper presents an investigation of the linear performance of piezoceramic materials. The investigation is made to study the level of precision that can be attained for a broad-band amplification of an open loop micro-positioner. Direct compensation is introduced that can enhance the open loop dynamics of the actuator. © 1994 SPIE. All rights reserved.

关键词： Mirrors

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ACTIVE STABILITY control OF SHAPE-MEMORY TUBES CONVEYING FLUIDS

ACTIVE STABILITY CONTROL OF SHAPE-MEMORY TUBES CONVEYING FLU...

引用

smart structures and materials 1994 Conference - smart structures and Intelligent Systems

作者： BAZ, A CHEN, T CATHOLIC UNIV AMER DEPT MECH ENGNWASHINGTONDC 20064

ISBN: (纸本)0819414859

The instability of elastic tubes conveying fluids is controlled by manufacturing these tubes from a nickel-titanium alloy (NITINOL) which has unique shape memory characteristics. A mathematical model is developed to describe the fundamentals governing the operation of this class of actively controlled NITINOL tubes while conveying fluids. The model describes the interaction between the fluid flow, the elastic behavior of the tubes, and the thermal activation of the shape memory effect. The predictions of the model are validated experimentally using a 0.58-m-long NITINOL-55 tube that has outer diameter of 2.134 mm and inner diameter of 1.778 mm. The effect of varying the activation strategy of the shape memory effect on the critical flow velocity, at which flow-induced instabilities occur, is determined theoretically and experimentally. It is shown that the shape memory controller can significantly increase these critical flow velocities as it stiffens the tubes by virtue of the strain energy imparted by the shape recovery process. Furthermore, the effectiveness of the controller is demonstrated also by its speed of response as it brings the unstable tubes back to their undeflected shape while conveying fluids at velocities equal to their uncontrolled critical velocities. Close agreement is obtained between the theoretical predictions and the experimental results. The results presented suggest the potential of the shape memory controller as a viable means for enhancing the elastic stability of tubes conveying fluids.

关键词： Mathematical modeling Fluid dynamics control systems Manufacturing Sensors Cerium Matrices Temperature metrology Thermal modeling Composites

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