Evolutionary Design of Engineering Constructions

Muc, Aleksander

doi:10.1590/1679-78254947

Cited by 17 publications

(5 citation statements)

References 51 publications

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“…For specimens subjected to tension with fibres directed at 45 • , the analysis of the stress-strain diagrams demonstrates always non-linearity, but this behaviour is not identical-compare Figure 1a The approximations of the stress-strain diagram seem to be important in view of theoretical and numerical modelling, especially in the area of continuum damage mechanics. Two general approaches can be introduced: 1 the use of spline curves with a finite number of key-points-see Muc [16]. 2 the definition of the σ-ε relation and fitting the parameters of this function using e.g., genetic algorithms-Muc [17].…”

Section: Experimental Results-approximations Of Non-linearitiesmentioning

confidence: 99%

Effects of Material Nonlinearities on Design of Composite Constructions—Elasto-Plastic Behaviour

Muc

2020

Materials

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Usually, the design of composite structures is limited to the linear elastic analysis only. The experimental results discussed in the paper demonstrate the physical non-linear behaviour both for unidirectional and woven roving composites. It is mainly connected with the micromechanical damages in composite structures, particularly with the effects of matrix cracking modeled in the form of elastic-plastic physical relations. In the present paper, the effects of both physical and geometrical non-linearities are taken into account. Their influence on the limit states (understood in the sense of buckling or failure/damage) of composite structures is discussed. The numerical examples deal with the behaviour of composite pressure vessels components, such as a cylindrical shell and the reinforcement of the junction of shells. The optimisation method of the reinforcement thickness is also formulated and solved herein.

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Section: Experimental Results-approximations Of Non-linearitiesmentioning

confidence: 99%

Effects of Material Nonlinearities on Design of Composite Constructions—Elasto-Plastic Behaviour

Muc

2020

Materials

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“…For composite laminated 2D structures the variety of problems connected with the definitions of appropriate design variables, objectives functions and optimization algorithms is discussed in Refs [51][52][53][54][55]. Figure A1.…”

Section: Discussionmentioning

confidence: 99%

Natural Frequencies of Rectangular Laminated Plates—Introduction to Optimal Design in Aeroelastic Problems

Muc

2018

Aerospace

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Free vibration (or eigenvalue analysis) is a prerequisite for aeroelastic analysis. For divergence analysis, slope influence coefficients (rotation at point i due to unit load at point j) are calculated using free vibration mode shapes and corresponding frequencies. The lowest eigenvalue is of interest and gives the divergence speed. The present paper considers the maximization problem of eigenfrequencies for composite panels. The influence of boundary conditions and constant or variable stiffnesses on optimization results are investigated herein. A new convenient set of design variables is employed in the analysis. The computations are carried out with the use of the Rayleigh–Ritz method and Finite Element analysis (2D quadrilateral and 3D solid elements).

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“…To continually improve the mechanism, by modifying its structure and parameters, we employed sGA. Genetic Algorithms in various implementations have been successfully applied in a variety of problems [40,41,42,43,44,45,46]. In order to explain the working principle of sGA, it is first necessary to introduce Real-Coded Genetic Algorithm (RC-GA)—a global optimization procedure, which works on real-valued decision variable vectors.…”

Section: Methodsmentioning

confidence: 99%

Structural and Material Optimization for Automatic Synthesis of Spine-Segment Mechanisms for Humanoid Robots with Custom Stiffness Profiles

Ciszkiewicz

Milewski

2019

Materials

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Typical artificial joints for humanoid robots use actual human body joints only as an inspiration. The load responses of these structures rarely match those of the corresponding joints, which is important when applying the robots in environments tailored to humans. In this study, we proposed a novel, automated method for designing substitutes for a human intervertebral joint. The substitutes were considered as two platforms, connected by a set of flexible links. Their structural and material parameters were obtained through optimization with a structured Genetic Algorithm, based on the reference angular stiffnesses. The proposed approach was tested in three numerical scenarios. In the first test, a mechanism with angular stiffnesses corresponded to the actual L4–L5 intervertebral joint. Scenarios 2 and 3 featured mechanisms with geometry and structure comparable to the joint, but with custom stiffness profiles. The obtained results proved the effectiveness of the proposed method. It could be employed in the design of artificial joints for humanoid robots and orthotic structures for the human spine. As the approach is general, it could also be extended to different body joints.

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Evolutionary Design of Engineering Constructions

Cited by 17 publications

References 51 publications

Effects of Material Nonlinearities on Design of Composite Constructions—Elasto-Plastic Behaviour

Effects of Material Nonlinearities on Design of Composite Constructions—Elasto-Plastic Behaviour

Natural Frequencies of Rectangular Laminated Plates—Introduction to Optimal Design in Aeroelastic Problems

Structural and Material Optimization for Automatic Synthesis of Spine-Segment Mechanisms for Humanoid Robots with Custom Stiffness Profiles

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