Optimum design of a lightweight mirror using aluminum foam or honeycomb sandwich construction: a case study for the GLAS telescope

2000 ◽  
Author(s):  
Shelly B. Conkey ◽  
Chiachung Lee ◽  
Stephen P. Chaykovsky ◽  
David A. Content ◽  
Armando Morrell ◽  
...  
Keyword(s):  
Optimum Design ◽  
Aluminum Foam ◽  
Sandwich Construction ◽  
Honeycomb Sandwich

Application of mathematical tools to improve the design and operation of activated sludge plants. Case study: the new WWTP of Galindo-Bilbao Part I: Optimum design

2001 ◽  
Vol 43 (7) ◽  
pp. 157-165 ◽  
Author(s):  
A. Rivas ◽  
E. Ayesa ◽  
A. Galarza ◽  
A. Salterain
Keyword(s):  
Activated Sludge ◽  
Optimum Design ◽  
Mathematical Formulation ◽  
Mathematical Programming Problem ◽  
Minimum Volume ◽  
Plant Model ◽  
Total Cost ◽  
Second Stage ◽  
Nonlinear Optimisation

This paper presents a mathematical formulation for the optimum design of a new activated sludge WWTP. The WWTP optimum design problem has been formulated as a Mathematical Programming problem, which is solved through a nonlinear optimisation method. The plant model has been based on the ASM1. The minimum volume of the biological reactors and the minimum total cost (including construction and exploitation costs) have been considered as optimisation criteria. Some practical results are also included, using as a case study the design of the second stage of the Galindo-Bilbao WWTP.

Exact solutions to some honeycomb sandwich beam, plate, and shell problems

1982 ◽  
Vol 17 (1) ◽  
pp. 1-8 ◽  
Author(s):  
P J Holt ◽  
J P H Webber
Keyword(s):  
Finite Elements ◽  
Circular Cylinder ◽  
Analytical Solutions ◽  
Sandwich Beam ◽  
Constant Thickness ◽  
Simple Loading ◽  
Sandwich Construction ◽  
Plate And Shell ◽  
Honeycomb Sandwich ◽  
Core Thickness

A consistent set of equations is given for honeycomb sandwich shells, wherein each layer of the sandwich is treated separately. The theory allows for the effects of thick cores, non-constant core thickness and arbitrary anisotropic faces. Analytical solutions are obtained for constant thickness and tapered beams, a flat plate, and a circular cylinder subjected to simple loading conditions. The principal use of such solutions is in the testing of finite elements which are intended to model honeycomb sandwich construction.

Optimum design of composite conical tanks under hydrostatic pressure

2018 ◽  
Vol 21 (13) ◽  
pp. 2030-2044 ◽  
Author(s):  
Ahmed A Elansary ◽  
Ashraf O Nassef ◽  
Ashraf A El Damatty
Keyword(s):  
Reinforced Concrete ◽  
Hydrostatic Pressure ◽  
Optimum Design ◽  
Steel Shell ◽  
Concrete Wall ◽  
Material Cost ◽  
Design Variables ◽  
Reinforced Concrete Wall ◽  
Conical Tanks

Elevated tanks are used all over the world to store water for times of shortage. These tanks can be made of steel, reinforced concrete, or composite, that is, concrete and steel. Composite tanks consist of an external steel shell attached to an internal reinforced concrete wall through steel studs. Composite conical tanks combine the advantages of reinforced concrete and steel tanks as they resist efficiently both tensile and compressive stresses. A comparison showed that the material cost of composite conical tanks is significantly less than that of steel or reinforced concrete tanks having the same layout dimensions. A numerical tool is developed to obtain the optimum design of composite conical tanks under hydrostatic pressure incorporating both finite element and genetic algorithm techniques. This tool is used to obtain the optimum design of a case study composite conical tank that was recently constructed. The developed optimization tool provides the thicknesses of the concrete and steel walls as well as the stud configuration corresponding to the minimum material cost. A comparison between the optimized and unoptimized case study composite tank revealed that a reduction of 32% in the material cost can be achieved. A sensitivity analysis is conducted by changing the price of concrete, steel plate, and studs by (±) 50% of the datum prices and obtaining the corresponding optimum design variables. This analysis showed that the optimum thicknesses of the concrete wall and steel shell as well as studs’ configuration are significantly sensitive to the change in the material prices.

Quasi-Static Failure Analysis of Honeycomb Sandwich Beam with Composite Facesheets

2010 ◽  
Vol 160-162 ◽  
pp. 855-859 ◽  
Author(s):  
Li Qing Meng ◽  
Yan Wu ◽  
Shi Zhe Chen ◽  
Xue Feng Shu
Keyword(s):  
Sandwich Beam ◽  
Indentation Test ◽  
Core Material ◽  
Honeycomb Core ◽  
Three Point Bending ◽  
Composite Sandwich ◽  
Sandwich Construction ◽  
Honeycomb Sandwich ◽  
Nomex Honeycomb ◽  
Static Failure

Sandwich construction consists of two thin composite or metal facesheets separated by a core material. Despite extensive researches on the sandwich constructions, their mechanical properties and failure behaviours are still not fully understand. The objective of the paper is to use a experimental and theoretical predicting failure mode for sandwich beam consisting of GFRP facesheets and Nomex honeycomb core. Two kinds of composite sandwich beams are observed in quasi-static three-point bending and indentation test.

Systematic Layout Planning to Assist Plant Layout: Case Study Pulley Factory

2011 ◽  
Vol 110-116 ◽  
pp. 3952-3956 ◽  
Author(s):  
Anucha Watanapa ◽  
Wisitsree Wiyaratn
Keyword(s):  
Optimum Design ◽  
Surface Finish ◽  
Material Flow ◽  
Activity Relationship ◽  
Plant Layout ◽  
Layout Planning ◽  
Space Requirement ◽  
Operation Process ◽  
Systematic Layout Planning

In this study, the application of a systematic plant layout planning (SLP) to assist the optimum design of process areas and locations is proposed. The number of machines and space requirement in pulley factory is determined. The operation process chart, flow of material and activity relationship chart have been investigated. The relationships between machines, operation sections and material flow are used to determine the suitable position of each activity. The SLP method has been employed to design the two alternative plant layouts and compare the performances between new layout and present layout in term of material flow. The new plant layout is modified by moving a disassembly and surface finish that significantly decrease the distance of material flow, so it is effective increasing production.

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