Optimal stiffness design of composite laminates for a train carbody by an expert system and enumeration method

2005 ◽  
Vol 68 (2) ◽  
pp. 147-156 ◽  
Author(s):  
Jung-Seok Kim ◽  
Nam-Po Kim ◽  
Seong-Ho Han
Keyword(s):  
Expert System ◽  
Composite Laminates ◽  
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.

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 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
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