A discrete-continuous parameterization (DCP) for concurrent optimization of structural topologies and continuous material orientations

2020 ◽  
Vol 236 ◽  
pp. 111900 ◽  
Author(s):  
Yunfeng Luo ◽  
Wenjiong Chen ◽  
Shutian Liu ◽  
Quhao Li ◽  
Yaohui Ma
Keyword(s):  
Concurrent Optimization ◽  
Continuous Parameterization ◽  
Continuous Material

scholarly journals NODAL COSINE SINE MATERIAL INTERPOLATION IN MULTI OBJECTIVE TOPOLOGY OPTIMIZATION WITH THE GLOBAL CRITERIA METHOD FOR LINEAR ELASTO STATIC, HEAT TRANSFER, POTENTIAL FLOW AND BINARY CROSS ENTROPY SHARPENING

2021 ◽  
Vol 1 ◽  
pp. 2247-2256
Author(s):  
Martin Denk ◽  
Klemens Rother ◽  
Mario Zinßer ◽  
Christoph Petroll ◽  
Kristin Paetzold
Keyword(s):  
Heat Transfer ◽  
Topology Optimization ◽  
Potential Flow ◽  
Cross Entropy ◽  
Objective Criterion ◽  
Multi Objective ◽  
Material Interpolation ◽  
Continuous Material ◽  
Mean Compliance ◽  
Transfer Potential

AbstractTopology optimization is typically used for suitable design suggestions for objectives like mean compliance, mean temperature, or model analysis. Some modern modeling technics in topology optimization require a nodal based material interpolation. Therefore this article is referred to a continuous material interpolation in topology optimization. To cover a smooth and differentiable density field, we address trigonometric shape functions which are infinitely differentiable. Furthermore, we extend a so-known global criteria method with a sharpening function based on binary cross-entropy, so that sharper solutions results. The proposed material interpolation is applied to different applications such as heat transfer, elasto static, and potential flow. Furthermore, these different objectives are together optimized using a multi-objective criterion.

scholarly journals Zero-group velocity modes in plates with continuous material variation through the thickness

2017 ◽  
Vol 141 (5) ◽  
pp. 3302-3311 ◽  
Author(s):  
Oskar Tofeldt ◽  
Nils Ryden
Keyword(s):  
Group Velocity ◽  
Zero Group ◽  
Continuous Material

Shot count reduction for non-Manhattan geometries: concurrent optimization of data fracture and mask writer design

2013 ◽  
Author(s):  
Russell Cinque ◽  
Tadashi Komagata ◽  
Taiichi Kiuchi ◽  
Clyde Browning ◽  
Patrick Schiavone ◽  
...  
Keyword(s):  
Concurrent Optimization

Investigation and Characterization of Clay Mixture Feedstock for Extrusion-Based Additive Manufacturing

2020 ◽  
Author(s):  
Tawaddod Alkindi ◽  
Mozah Alyammahi ◽  
Rahmat Agung Susantyoko
Keyword(s):  
Cost Efficiency ◽  
Ceramic Materials ◽  
3D Printer ◽  
Mixing Processes ◽  
Ceramic Components ◽  
Computer Controlled ◽  
Continuous Material ◽  
Printing Speed

Abstract The extrusion-based AM technique has been recently employed for rapid ceramic components fabrication due to scalability and cost-efficiency. This paper investigated aspects of the extrusion technique to print ceramic materials. Specifically, we assessed and developed a process recipe of the formulations (the composition of water and ethanol-based clay mixtures) and mixing processes. Different clay paste formulations were prepared by varying clay, water, ethanol ratios. The viscosity of clay paste was measured using a DV3T Viscometer. Afterward, the produced clay paste was used as a feedstock for WASP Delta 60100 3D printer for computer-controlled extrusion deposition. We evaluated the quality of the clay paste based on (i) pumpability, (ii) printability, and (iii) buildability. Pressure and flow rate were monitored to assess the pumpability. The nozzle was monitored for continuous material extrusion to assess printability. The maximum layer-without-collapse height was monitored to assess the buildability. This study correlated the mixture composition and process parameters, to the viscosity of the mixture, at the same printing speed. We found that 85 wt% clay, 5 wt% water, 10 wt% ethanol paste formulation, with the viscosity of 828000 cP, 202400 cP, 40400 cP at 1, 5, and 50 rpm, respectively, demonstrates good pumpability, as well as best printability and buildability.

scholarly journals Concurrent optimization of harvesting and road network layouts under steep terrain

2012 ◽  
Author(s):  
Leo Gallus Bont ◽  
Hans Rudolf Heinimann ◽  
Richard L. Church
Keyword(s):  
Road Network ◽  
Concurrent Optimization ◽  
Steep Terrain

Turbulent Transfer Near the Interface

1995 ◽  
Author(s):  
Eric B. Kraus ◽  
Joost A. Businger
Keyword(s):  
Molecular Diffusion ◽  
Turbulent Transport ◽  
Sea Surface ◽  
Material Surface ◽  
Gas Transfer ◽  
Intimate Contact ◽  
Practical Applications ◽  
Ocean Spray ◽  
Trace Constituents ◽  
Continuous Material

The atmosphere and the ocean are in intimate contact at their interface, where momentum, water substance, heat, and trace constituents are exchanged. This exchange is often modest when a light breeze strokes the surface; sometimes the processes are violent, when gale force winds sweep up ocean spray into the atmosphere and when braking waves engulf air into the ocean. It may even appear that the transition between ocean and atmosphere becomes gradual and indistinct. The transition from ocean to atmosphere is usually an abrupt transition of one fluid to another. The interface may then be considered a continuous material surface. On both sides of the interface the fluids are usually in turbulent motion and properties are transported readily, but upon approaching the interface turbulence is largely suppressed so that on both sides of the interface a very thin layer exists where the molecular diffusion coefficients play a major role in the transport. The interface is consequently a significant barrier to the transport from ocean to atmosphere and vice versa, with little or no turbulent transport of scalar quantities across it. The quantitative determination of the thickness of the molecular sublayers and the strength of the gradients and shear layers within them are discussed in Section 5.1. We also examine the transition from the molecular sublayers to the well-mixed turbulent layers that exist beyond them, and the structure of these turbulent layers on either side of the interface. In Section 5.2 we discuss the effect of stratification on the structure of these surface layers. Some of the nonstationary interactions between the wind and the sea surface are described in Section 5.3. Sections 5.4 and 5.5 deal with practical applications: a formulation of gas transfer across the interface and of the sea surface temperature. Several observational techniques are discussed in Section 5.6.

Design and Implementation of Concurrent Optimization Schemes for Sports Health Prediction Platform

2018 ◽  
Author(s):  
Yu Liu ◽  
Ruomei Wang ◽  
Yuhan Guan ◽  
Fan Zhou ◽  
Fuwei Zhang ◽  
...  
Keyword(s):  
Design And Implementation ◽  
Concurrent Optimization ◽  
Optimization Schemes
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