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

共 142 条记录，以下是101-110 订阅

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Robust intelligent control of structures using piezoceramic materials

Robust intelligent control of structures using piezoceramic ...

引用

SPIE conference on mathematics and control in smart structures

作者： Mayhan, P Washington, G Ohio State Univ Intelligent Struct & Syst Lab Columbus OH 43210 USA

ISBN: (纸本)0819427675

The use of smart materials (piezoceramic elements) in structure vibration damping has risen in popularity. The ability to use these materials as both sensors, capturing a voltage upon straining of the material, and actuators, acquiring a displacement due to an electric voltage, has increased The work presented in this paper develops the use of robust intelligent control as applied to smart materials. A steel cantilever beam was constructed as the experimental (physical) plant. Piezoceramic material, lead zirconate titanate (PZT), was surface mounted as both sensors and actuators. The controller was formed using algorithms produced from adaptive fuzzy controls. Fuzzy model reference learning control (FMRLC) is a learning system with the capability to improve its performance over a period of time when various plant uncertainties are introduced. The expected goal of this paper is to dampen the fundamental vibration mode of the beam utilizing the intelligent control algorithm developed. Other controllers, such as positive position feedback (PPF) and direct fuzzy (DF), were developed and compared to the adaptive fuzzy controller. The robustness of the system was also examined when the cantilever beam system properties changed. Extra masses were added to account for the variations of the system parameters. The FMRLC controller showed a dramatic improvement over the PPF and the DF. It is the adaptive nature of the FMRLC that makes the system robust to parameter changes.

关键词： smart structures intelligent control fuzzy logic control piezoceramic vibration damping

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Soft computing control of piezo walking microrobots

Soft computing control of piezo walking microrobots

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SPIE conference on mathematics and control in smart structures

作者： Muscato, G Dipartimento Elettr Elettton & Sistemist I-95125 Catania Italy

ISBN: (纸本)0819427675

PLIF (Piezo Light Intelligent Flea) are a family of walking three legs microrobots;two legs are moved by means of piezo ceramic bimorph actuators, while the third is only passive. These robots are very small (2cm x 2cm) and very light (few grams) but at the same time relatively fast (20 cm/s) with the capability to move with very small steps (few microns). In the paper three different type of PLIF are described and some measurement performed with a camera are reported in order to identify the dynamical behaviour of the robots. The dynamic measures pointed out that is very difficult to control these systems because of the high uncertainties in the interactions between the legs and the surface. Then a Soft-computing approach for the control of such systems has been proposed by using infrared detector as sensors on the robots.

关键词： micro-robotics micro-mechatronics soft-computing piezoelectric actuators intelligent control

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Vibration and instability of spinning thin-walled beams featuring anistropy and pretwist and incorporating adaptive capabilities

Vibration and instability of spinning thin-walled beams feat...

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SPIE conference on mathematics and control in smart structures

作者： Song, O Librescu, L Chungnam Natl Univ Dept Mech Engn Taejon 305764 South Korea

ISBN: (纸本)0819427675

An integrated dual approach aiming at controlling the dynamic behavior of anisotropic pretwisted beams rotating with constant angular speed about their longitudinal body axis fixed in the inertial space is presented. The approach is based upon the simultaneous implementation and use of the directionality property featured by the composite materials and of adaptive material systems technology. While the former control technique uses the anisotropy properties of the advanced composite material structures, the latter one exploits the actuating capabilities provided by the piezoelectric materials which are bonded or embedded into the host structure. A dynamic control law relating the piezoelectrically induced boundary bending moments with conveniently selected dynamic response characteristics of the structure is implemented, and its results upon the closed-loop eigenfrequencies of spinning beams are highlighted.

关键词： Anisotropy Composites Feedback control Actuators Adaptive control control systems Copper Vibration control Mechanical engineering Mechanics

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Flexural vibrations of smart beams taking into account the influence of shear, rotatory inertia and coupling to the electric field

Flexural vibrations of smart beams taking into account the i...

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SPIE conference on mathematics and control in smart structures

作者： Irschik, H Krommer, M Univ Linz Inst Mech & Mech Engn Div Tech Mech A-4040 Linz Austria

ISBN: (纸本)0819427675

Flexural vibrations of smart beams are considered where distributed actuators and sensors are realized by means of piezoelastic layers. Utilizing a variational formulation, the direct piezoelectric and the pyroelectric effect are incorporated into beam theory via suitable approximations for the axial components of electric field or electric displacement, respectively. Influence of shear and rotatory inertia is taken into account in the manner suggested by Timoshenko. It is shown that the effects of the direct piezoelectric and the pyroelectric effect lead to effective stiffness parameters. The present coupled Timoshenko-type theory thus is equal in computational complexity when compared to the commonly used decoupled theory. This advantageous behavior is utilized for studying thermally induced deflections and calculating natural frequencies.

关键词： vibrations beams piezoelectricity pyroelectric effect

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Improved aircraft roll maneuver performance using smart deformable wings

Improved aircraft roll maneuver performance using smart defo...

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SPIE conference on mathematics and control in smart structures

作者： Yedavalli, RK Khot, NS Kwak, SK Ohio State Univ Dept Aerosp Engn Appl Mech & Aviat Columbus OH 43210 USA

ISBN: (纸本)0819427675

In this paper, the aspects of modeling and control design methodology for improving roll maneuver performance in aircrafts (for achieving a desired roll rate) by deforming a flexible wing with piezoelectric actuation and sensing are studied. An integrated finite element model of a laminated composite plate embedded with smart piezo actuators and sensors subject to aerodynamic loading giving rise to a steady roll rate is developed. The resulting model in the generalized coordinates which has nonsymmetric aerodynamic damping matrix and a nonsymmetric stiffness matrix (due to aerodynamic stiffness) is then transformed to real but nonorthogonal modal coordinates and a reduced order model is developed. A new control design algorithm based on 'Reciprocal State Space' framework is then developed to achieve the desired roll rate and to simultaneously suppress the flexible mode vibrations. The research carried out clearly delineates the relationship and interaction between the structural, aerodynamic and piezo actuation based control subsystems and underscores the importance, potential and the vast scope of the proposed integrated, approach to improve aircraft maneuver performance.

关键词： smart structure control vibration suppression deformable wing roll maneuver nonorthogonal modal coordinates integrated finite element method reciprocal state space control design active control feedback control aeroelasticity

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An eigenvalue technique for analyzing structural-acoustic power efficiency

An eigenvalue technique for analyzing structural-acoustic po...

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SPIE conference on mathematics and control in smart structures

作者： Cao, R Leo, DJ Univ Toledo Mech Ind & Mfg Engn Dept Toledo OH 43606 USA

ISBN: (纸本)0819427675

A generalized eigenvalue technique is developed for analyzing the structural-acoustic power efficiency of point force actuators. The eigenvalue technique is used to investigate the effect of actuator location and supporting boundary conditions on the power efficiency. Finite element analysis is used to compute the mode shapes of plates with boundary conditions that range from simply-supported to clamped. Power efficiency calculations are then performed for the case of a single point force actuator and an array of point force actuators. The analyses demonstrate that the power efficiency is strongly dependent on actuator location and frequency, but less dependent on the supporting boundary conditions.

关键词： active control sensor-actuator arrays power efficiency finite element analysis

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Behavior of SMA actuators under non-proportional thermomechanical loading

Behavior of SMA actuators under non-proportional thermomecha...

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SPIE conference on mathematics and control in smart structures

作者： Bo, ZH Lagoudas, DC Miller, D Texas A&M Univ Dept Aerosp Engn Ctr Mech Composites College Stn TX 77843 USA

ISBN: (纸本)0819427675

The application of SMA actuators in smart structures usually involve thermally induced phase transformation with a variable applied stress in SMA actuators, resulting in thermomechanical non-proportional loading of SMAs in stress-temperature space. To investigate the constitutive response of SMAs under thermomechanical non-proportional loading, experiments for thermally induced phase transformation of binary NiTi SMA wires loaded by an elastic linear spring are performed in the Active Materials Laboratory at Texas A&M University. A constitutive model developed by Bo and Lagoudas (1998a,b,c) and Lagoudas and Bo (1998) is used as the basis for the theoretical prediction of the response of SMA line actuators loaded by springs with different elastic constants. Model predictions are compared with experimental results.

关键词： Shape memory alloys Actuators Data modeling smart structures Thermal modeling Binary data Fluctuations and noise Temperature metrology Data acquisition Sun

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Aeroelastic control with self-straining actuators: continuum models

Aeroelastic control with self-straining actuators: continuum...

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SPIE conference on mathematics and control in smart structures

作者： Balakrishnan, AV Univ Calif Los Angeles Flight Syst Res Ctr Los Angeles CA 90024 USA

ISBN: (纸本)0819427675

The problem of flutter suppression using self-straining actuators has been analyzed using the full continuum modelactuators has been analyzed using the full continuum model of Goland-Ashley and the time-domain solution thereof developed. The theory yields a necessary condition for flutter to occur as well as a formula for the divergence speed. Aeroelastic modes are shown to be the roots of the determinant of a 3 x 3 matrix, which involves the Theodorsen function which has the entire negative real axis including zero as an essential singularity line. Computer calculations are presented for the numerical values of the Goland model where the first pitching mode flutters. It is shown that the flutter speed increases as the twisting control gain alone increases (no bending control). There is a critical value of the gain beyond which the pitching mode is stable but the bending flutters but the flutter speed increases as the pitching control gain is increased. The situation is reversed for the bending control. Here the flutter speed actually decreases as the bending control gain increases (no pitch control). There is a critical value for the gain beyond which the pitching mode ceases to flutter but the bending mode - actually the "clamped/rolling" mode - flutters but the flutter speed decreases as the gain is increased. The effect is similar whatever the value of the pitching control gain. It is noted that increasing control gain may decrease flutter speed in higher-order modes.

关键词： Actuators Mathematical modeling Aerodynamics Space operations Analytical research mathematics Systems modeling control systems Finite element methods smart structures

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High spatial resolution soliton DOFS for smart structures

High spatial resolution soliton DOFS for smart structures

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SPIE conference on mathematics and control in smart structures

作者： Song, MP Tang, WZ Zhou, W Zhejiang Univ Dept Informat & Elect Engn Hangzhou 310027 Peoples R China

ISBN: (纸本)0819427675

From the advantage and defect of current distributed optical-fiber sensor(DOFS) schemes, It could be seen that most of schemes except distributed anti-Stokes Ratio Termometry(DART) are only possible in experiment, but unpractical. But DART is not able to be used on small and fine things especially for smart structures, because of its poor spatial resolution. As we all know that the relaxation time of Raman scattering is in the femtosecond range, and a optical pulse with width >1ps will not receive gain reducing, so the potential spatial resolution of DART can be smaller than 0.1m, even 1mm(for a pulse with width <10ps). Considering these, we firstly propose a novel scheme of DOFS based on spontaneons Raman back-scatering and the effect of high-order soliton, which uses Time-correlated Single Photon Counting(TCPC) as detector. The first-order and high-order solitons' effect in the system are theoretically investigated, and it is found that it is able to improve the spatial resolution observably by using high-order soliton in relatively short sensing distance(<1km). In the end, the possibility and difficulties of realizing the system based on present-day level of devices are considered.

关键词： distributed optical-fiber sensor soliton spatial resolution back-scattering light smart structures

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Stress and electric field concentrations in piezoelectrics with defects

Stress and electric field concentrations in piezoelectrics w...

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SPIE conference on mathematics and control in smart structures

作者： Xu, XL Rajapakse, RKND Univ Manitoba Dept Civil & Geol Engn Winnipeg MB R3T 5V6 Canada

ISBN: (纸本)0819427675

A solution scheme based on the boundary integral equation method is employed to analyze plane electroelastic fields in piezoelectric solids with arbitrary shaped defects(cavities, cracks, etc). Constitutive equations for solids with hexagonal symmetry are used. The accuracy of the computational scheme is verified by comparing with analytical solutions reported in the literature for a circular cavity and a horizontal center crack in an infinite plane. Numerical results show a significant dependence of mechanical and electric fields on the geometry and orientation of cavities. Complex coupling between electric and mechanical fields is observed. Crack closure calculation of strain energy release rate of piezoelectric solids suggests that strain energy release rate is an accurate fracture criterion for piezoelectric solids, and electric loading may impede or enhance crack propagation. The present boundary element scheme can be used to analyze many interesting fracture problems involving smart structures element with embedded or surface mounted piezoelectric actuators.

关键词： piezoelectricity stress concentration defects cracks boundary element fracture mechanics strain energy release rate crack closure integral smart structures

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