Optimal Design of Electric Overhead Crane Girders

1984 ◽  
Vol 106 (2) ◽  
pp. 203-208
Author(s):  
S. W. Cho ◽  
B. M. Kwak
Keyword(s):  
Sensitivity Analysis ◽  
Optimal Design ◽  
Mathematical Programming ◽  
Computer Program ◽  
Optimum Design ◽  
Minimum Weight ◽  
Steepest Descent ◽  
Overhead Crane ◽  
Simply Supported ◽  
Steepest Descent Algorithm

An optimal design for minimum weight bridge girders of electric overhead traveling cranes is presented. The welded box-type girder is modeled as a simply supported beam. A generalized steepest descent algorithm is adopted for mathematical programming, which includes constraints on stress, displacement, buckling, and sizes. A computer program capable of designing girders according to CMAA, DIN, BS, and JIS specifications is developed. Numerical comparisons with existing girders for those four specifications are given. A sensitivity analysis of the optimum design with respect to parameters affecting the design is studied for each specification.

Optimum Design of Spread Mooring Systems

1982 ◽  
Vol 104 (1) ◽  
pp. 78-83 ◽  
Author(s):  
H. L. Jones ◽  
J. K. Nelson
Keyword(s):  
Optimal Design ◽  
Mathematical Programming ◽  
Optimum Design ◽  
Loading Condition ◽  
Optimization Problem ◽  
Mooring System ◽  
Computer Solution ◽  
Initial Tension ◽  
Design Variables ◽  
Problem Design

The design of a spread mooring system of given pattern with single segment lines on a flat seafloor is formulated as a mathematical programming (optimization) problem. Design variables are the outboard length and initial tension in each line. Constraints limit maximum tension, anchor pull and anchor uplift for each line under each loading condition. Maximum vessel excursion is limited to a circle of specified radius. The optimal design is that which minimizes total weight of outboard line and is obtained by computer solution of the optimization problem. Three examples are presented to demonstrate the method.

Framework for investigating the effect of different design lives on the design of bridges

2021 ◽  
Author(s):  
Egor Svechnikov ◽  
Johan Maljaars ◽  
Bert Snijder ◽  
Johan de Boon ◽  
Eize Drenth
Keyword(s):  
Optimal Design ◽  
The Netherlands ◽  
Optimum Design ◽  
Functional Capacity ◽  
Road Network ◽  
Developed Countries ◽  
Research Activities ◽  
Design Life ◽  
National Road ◽  
Structural Solutions

<p>Many developed countries have a national road network including a significant number of bridges in need of renovation or replacement in the coming years. The reason for this is their technical and functional capacity becoming insufficient due to aging and changes in societal demands. Therefore, these bridges need to be adjusted or replaced. National authorities in The Netherlands currently require a design life of 100 years for new bridges, however nowadays it seems reasonable to have a certain flexibility for this parameter. Since the selected design life has its implications on structural solutions and choice of materials, the identification of the optimal design life for bridges seems necessary. This paper gives a summary on the issue regarding the optimum design life of bridges and it highlights the framework of the upcoming research activities.</p>

Optimum Structural Design of High-Speed Surface Effect Ships Built of Composite Materials

2003 ◽  
Vol 40 (01) ◽  
pp. 42-48
Author(s):  
Chang Doo Jang ◽  
Ho Kyung Kim ◽  
Ha Cheol Song
Keyword(s):  
Composite Materials ◽  
Computer Program ◽  
Structural Design ◽  
High Speed ◽  
Surface Effect ◽  
Minimum Weight ◽  
Original Design ◽  
Optimum Structural Design ◽  
Surface Effect Ship ◽  
Speed Performance

A surface effect ship is known to be comparable to a high-speed ship. For the structural design of surface effect ships, advanced design methods are needed which can reflect the various loading conditions different from those of conventional ships. Also, minimum weight design is essential because hull weight significantly affects the lift, thrust powering and high-speed performance. This paper presents the procedure of optimum structural design and a computer program to minimize the hull weight of surface effect ships built of composite materials. By using the developed computer program, the optimum structural designs for three types of surface effect ships—built of sandwich plate only, stiffened single skin plate only, and both plates—are carried out and the efficiency of each type is investigated in terms of weight. The computer program, developed herein, successfully reduced the hull weight of surface effect ships by 15–30% compared with the original design. Numerical results of optimum structural designs are presented and discussed.

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