Intelligent structures for aerospace - A technology overview and assessment

Crawley, Edward F.

doi:10.2514/3.12161

Cited by 398 publications

(168 citation statements)

References 73 publications

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“…For instance, researchers suggested intelligent structures for the aerospace industry (Crawley, 1994). SME emphasizes the study of interactions between materialization of system components, and intends to develop functional materials to enhance the performance at a system level (Tani et al, 1998).…”

Section: Materialization Of Technical Systemsmentioning

confidence: 99%

An initial categorization of foundational research in complex technical systems

Horváth

2015

J. Zhejiang Univ. Sci. A

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There has been intense foundational research in complex technical systems (CTSs) over the last half century. These systems are exemplified by advanced mechatronics systems, embedded control systems, real-time systems, agent-based smart systems, distributed software systems, internet of things systems, and cyber-physical systems. The objective of this paper is to offer an initial cataloguing of the various research domains and to identify the major research issues. The paper has an ontological flavour, because it concentrates on what research has been and is being done, rather than on why and how research is done. The underpinning study has been done in three stages: (i) intuition-driven exploration of a reference set of related academic publications, (ii) evidence-based specification of a categorization of the domains and subdomains of research, and (iii) refinement and validation of the proposed classification based on a control set of related academic publications. The proposed reasoning model identifies three categories of research domains. The 'intellectualizations' category includes research domains such as: (i) philosophy, (ii) ontology, and (iii) epistemology of CTSs. The research domains included in the 'realizations' category are: (iv) methodology, and (v) creation of CTSs. The domains considered in the 'influences' category are: (vi) manifestations, and (vii) axiology of CTSs. Based on the proposed reasoning model a landscape of foundational research in CTSs is proposed for public debate. Our follow-up study focuses on the extension of the proposed classification to other families of complex engineered systems such as sociotechnical systems and social ecosystems.

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Section: Materialization Of Technical Systemsmentioning

confidence: 99%

An initial categorization of foundational research in complex technical systems

Horváth

2015

J. Zhejiang Univ. Sci. A

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“…Fridrikh et al [9] established a simple model for the stretching of a viscous charged fluid in an electric field. The model predicts a terminal jet diameter which is a consequence of balance between normal stresses due to surface tension and surface charge repulsion.…”

Section: Modeling Of Electrospinning Parametersmentioning

confidence: 99%

“…Many researchers used this process to improve PVDF piezoelectric properties by changing α phase to β phase which is responsible for piezoelectric properties of PVDF [3][4][5][6]. Electrospinning is a unique technique to produce continuous nano/micro fibers (5-500 nm) which are controllable by process parameters [7][8][9].The diameter size of electrospun fibers is greatly dependent on the processing and solution properties. The major electrospinning processing parameters include the applied voltage, solution flow rate, and electrospinning distance [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Applying the Genetic Algorithm for determination Electrospinning Parameters of Poly Vinylidene Fluoride (PVDF) Nano Fibers: Theoretical & Experimental Analysis

Mokhtari¹,

Latifi²,

Shamshirsaz³

2017

JTEFT

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Poly Vinylidene Fluoride (PVDF) because of its piezoelectric properties has been applied in different applications such as smart textiles, medical application and membranes for energy harvesting. It was declared that nanofibres diameters and electrospinning parameters could be enhanced the piezoelectric properties of these materials. The main objective of this paper is applying the Genetic Algorithm (GA) to determine the optimum condition of solution parameters and processing conditions based on the desired diameter size of PVDF fibers to produce the fibers without any structural faults. In this method, The Fitness function was determined by a simple analytical model presented by Fridrikh. Toward approving the GA results the experimental tests were done. the effect of four parameters such as flow rate of the polymer solution, electrospinning voltage, electrospinning distance and polymer concentration on the fiber formation and fiber diameter size of electrospun PVDF fibers have been explored by Scanning Electron Microscopy (SEM) to attest the accuracy of the model. Assessment of experimental and theoretical results show that electrospinning parameters determined by GA method leads to achieve desire fiber diameters. Because of time and energy consuming of electrospinning process, the GA method may be useful to achieve desired fiber diameter by determining electrospinning parameters for polymers prior to fiber production.

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“…Moheimani and Fleming [4]. A further overview of piezoelectricity is given by Crawley [5], Miu [6] and Tzou [7]. The notion of eigenstrain was first introduced by Mura [8] and means a non-elastic strain, e.g.…”

Section: Introductionmentioning

confidence: 99%

Bending moment tracking and the reduction of the axial stress in vibrating beams by piezoelectric actuation

Schoeftner

2017

Acta Mech

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This contribution focuses on bending moment tracking in slender beam-type structures that are equipped with piezoelectric actuators. Bending moments are associated with the axial stress, which is the dominant stress component of laterally excited beam structures. If the maximum value exceeds a certain tensile stress limit, the structures will crack or be irreparably damaged. In the present contribution, a piezoelectric bimorph beam is considered and it is investigated in which manner the piezoelectric actuation devices have to be distributed along the beam length, such that a certain bending moment distribution is obtained. This is called bending moment tracking. First, the basic equations of a piezoelectric bimorph beam are recalled and the differential equations for the bending moment are derived. Then a positive semi-definite integral depending on the error of the bending moment is defined, which is the difference between the actual and the desired bending moment. The results of the derivations are conditions for the eigencurvature due to the piezoelectric actuation, such that a certain bending moment distribution is achieved. Approximate solutions for the eigencurvature are also presented for the lower-and for the high-frequency domain. The theory is verified by a support-excited piezoelectric bimorph. First, the frequency response curves for the deflection, the bending moment and the axial stresses are calculated. Then the responses due to a sinusoidal excitation are computed, showing that the suggested control algorithm enables the reduction of the bending moment and also of the axial stress in a satisfactory manner.

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Intelligent structures for aerospace - A technology overview and assessment

Cited by 398 publications

References 73 publications

An initial categorization of foundational research in complex technical systems

An initial categorization of foundational research in complex technical systems

Applying the Genetic Algorithm for determination Electrospinning Parameters of Poly Vinylidene Fluoride (PVDF) Nano Fibers: Theoretical & Experimental Analysis

Bending moment tracking and the reduction of the axial stress in vibrating beams by piezoelectric actuation

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