Optimal stiffness design of sandwich plates with variable core densities

2014 ◽  
Author(s):  
Dag Lukkassen ◽  
Annette Meidell ◽  
Herman Myrvoll
Keyword(s):  
Sandwich Plates ◽  
Stiffness Design ◽  
Optimal Stiffness

scholarly journals Optimal Stiffness Design for an Exhaustive Parallel Compliance Matrix in Multiactuator Robotic Limbs

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Nathan M. Cahill ◽  
Thomas Sugar ◽  
Yi Ren ◽  
Kyle Schroeder
Keyword(s):  
Energy Efficient ◽  
Peak Power ◽  
Performance Metrics ◽  
Slow Growth ◽  
Legged Robots ◽  
Power Requirement ◽  
Compliance Matrix ◽  
Performance Metric ◽  
Stiffness Design ◽  
Optimal Stiffness

Comparatively slow growth in energy density of both power storage and generation technologies has placed added emphasis on the need for energy-efficient designs in legged robots. This paper explores the potential of parallel springs in robot limb design. We start by adding what we call the exhaustive parallel compliance matrix (EPCM) to the design. The EPCM is a set of parallel springs, which includes a parallel spring for each joint and a multijoint parallel spring for all possible combinations of the robot's joints. Then, we carefully formulate and compare two performance metrics, which improve various aspects of the system performance. Each performance metric is analyzed and compared, their strengths and weaknesses being rigorously presented. The performance benefits associated with this approach are dramatic. Implementing the spring matrix reduces the sum of square power (SSP) exerted by the actuators by up to 47%, the peak power requirement by almost 40%, the sum of squared current by 55%, and the peak current by 55%. These results were generated using a planar robot limb and a gait trajectory borrowed from biology. We use a fully dynamic model of the robotic system including inertial effects. We also test the design robustness using a perturbation study, which shows that the parallel springs are effective even in the presence of trajectory perturbation.

Fiber-Reinforced Sandwich Plates Under Static Loads—Proposals for Their Optimization

1986 ◽  
Vol 108 (2) ◽  
pp. 152-158 ◽  
Author(s):  
H. A. Eschenauer ◽  
W. Fuchs
Keyword(s):  
Optimal Design ◽  
Composite Structures ◽  
Design Method ◽  
Sandwich Plates ◽  
Structural Members ◽  
Optimization Strategy ◽  
Static Loads ◽  
Conflicting Objectives ◽  
Sequential Linearization ◽  
Optimal Stiffness

In order to satisfy the permanently increasing specification demands on machines and plants, the structural members and units of the constructions have to be designed in an “optimal” way. Nowadays more and more composite structures are attaining such new fields of application where one-component materials are not able to fulfill the higher demands. Typical examples are light constructions with optimal stiffness at various loadings. In this paper, a detailed investigation of the deformation behavior of a simply supported sandwich plate under static loads is carried out. Then, an optimal design method is formulated as a nonlinear multiobjective optimization problem by adopting the two conflicting objectives “minimal deformation” at “minimal weight,” including a set of constraints. The application of an optimization strategy is shown by means of a special preference function and sequential linearization as optimizer. Finally, some results of this procedure are discussed concerning the optimal design of sandwich plates.

scholarly journals Optimal Stiffness Design of Self-Piercing Riveting's C-Frame for Multimaterial Joining

2021 ◽  
Vol 20 (5) ◽  
pp. 76-84
Author(s):  
Chang-Yeul Shin ◽  
◽  
Jae-Jin Lee ◽  
Ji-Hun Mun ◽  
Soon-Deok Kwon ◽  
...  
Keyword(s):  
Stiffness Design ◽  
Optimal Stiffness

Sandwich Plates Actuated by a Kagome Planar Truss

2004 ◽  
Vol 71 (5) ◽  
pp. 652-662 ◽  
Author(s):  
N. Wicks ◽  
J. W. Hutchinson
Keyword(s):  
Internal Resistance ◽  
Face Sheet ◽  
Sandwich Plates ◽  
Long Wavelength ◽  
Double Curvature ◽  
Truss Core ◽  
Pyramidal Truss ◽  
Kagome Truss ◽  
Optimal Stiffness

Kagome truss plates have properties that suggest they should be uniquely effective as an actuation plane for sandwich plates: a Kagome truss plate has in-plane isotropy, optimal stiffness and strength, and its truss members can be actuated with minimal internal resistance. In this paper, sandwich plates are studied that are comprised of one solid face sheet and one actuated Kagome face sheet joined by a pyramidal truss core. Various aspects of the actuation behavior of these plates are investigated, including internal resistance and strains resulting from actuation and efficiency of actuation. Single and double curvature actuation modes are investigated. Contact is made with analytic results for actuation modes with long wavelength.

Generation of ao waves in sandwich plates

2002 ◽  
Vol 90 ◽  
pp. 42-42
Author(s):  
D. Osmont ◽  
D. Barnoncel ◽  
M. Dupont
Keyword(s):  
Sandwich Plates
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