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Morphing pasta and beyond


Abstract
Morphing structures are often engineered with stresses introduced into a flat sheet by leveraging structural anisotropy or compositional heterogeneity. Here, we identify a simple and universal diffusion-based mechanism to enable a transient morphing effect in structures with parametric surface grooves, which can be realized with a single material and fabricated using low-cost manufacturing methods (e.g., stamping, molding, and casting). We demonstrate from quantitative experiments and multiphysics simulations that parametric surface grooving can induce temporary asynchronous swelling or deswelling and can transform flat objects into designed, three-dimensional shapes. By tuning the grooving pattern, we can achieve both zero (e.g., helices) and nonzero (e.g., saddles) Gaussian curvature geometries. This mechanism allows us to demonstrate approaches that could improve the efficiency of certain food manufacturing processes and facilitate the sustainable packaging of food ....

San Diego , United States , Ultimaker Cura , Dow Corning Corp , Polymaker Inc , Carnegie Mellon University , National Natural Science Foundation Of China , Syracuse University , Ultimaker Inc , Thinky United Statesa Inc , San Diego Supercomputer Center , Stratasys Inc , Carnegie Mellon University Manufacturing Futures Initiative , Industries Inc , Richard King Mellon Foundation , Us National Science Foundation , Dow Corning , Thinky United Statesa , Smooth On Inc , Creative Commons Attribution Noncommercial , Science Foundation , National Natural Science Foundation , Triton Shared Computing Cluster , Extreme Science , Engineering Discovery , சான் டியாகோ ,

Electronics-free pneumatic circuits for controlling soft-legged robots

Pneumatically actuated soft robots have recently shown promise for their ability to adapt to their environment. Previously, these robots have been controlled with electromechanical components, such as valves and pumps, that are typically bulky and expensive. Here, we present an approach for controlling the gaits of soft-legged robots using simple pneumatic circuits without any electronic components. This approach produces locomotive gaits using ring oscillators composed of soft valves that generate oscillating signals analogous to biological central pattern generator neural circuits, which are acted upon by pneumatic logic components in response to sensor inputs. Our robot requires only a constant source of pressurized air to power both control and actuation systems. We demonstrate this approach by designing pneumatic control circuits to generate walking gaits for a soft-legged quadruped with three degrees of freedom per leg and to switch between gaits to control the direction of locom ....

Teleflex Inc , Stratasys Inc , Honeywell International Inc , Supplementary Materials , Corra Flex Tubing , Makerbot Replicator , Smooth On Inc , ஹனிவெல் சர்வதேச இன்க் , துணை பொருட்கள் , கோரா நெகிழ்வு குழாய் , மென்மையான ஆன் இன்க் ,