Optimum Design Study of a Hydraulic Pressure Derrick Based on Stability

2011 ◽  
Vol 189-193 ◽  
pp. 1982-1985
Author(s):  
Yu Lian Zhang ◽  
Hai Zhang
Keyword(s):  
Optimum Design ◽  
Optimization Theory ◽  
Numerical Results ◽  
Dual Method ◽  
Hydraulic Pressure ◽  
Design Study ◽  
Bearing Load ◽  
The Optimizing Model ◽  
Structure Strength ◽  
Optimizing Model

The bearing load is very large when the hydraulic pressure derrick suspends cargo. The hydraulic pressure derrick is a very important component which transfers cargo load to hull. The method of optimization theory based on dual method was transplanted to optimize the hydraulic pressure derrick structure and the optimizing model of the hydraulic pressure derrick was established. The hydraulic pressure derrick structure was optimized under four load cases. The numerical results show that the structure strength and stability of hydraulic pressure derrick are fit.

Optimum Design Study of Hydraulic Hatch Cover on Buckling Strength

2011 ◽  
Vol 295-297 ◽  
pp. 2479-2482
Author(s):  
Yu Lian Zhang ◽  
Hai Zhang
Keyword(s):  
Numerical Calculation ◽  
Optimum Design ◽  
Target Function ◽  
Optimization Theory ◽  
Calculation Model ◽  
Design Study ◽  
Buckling Strength ◽  
Multiple Loads ◽  
Calculation Results ◽  
Design Requirements

The hydraulic hatch cover is used to seal rainwater and to carry container and weather loads. The method of optimization theory based on dual method has been transplanted to optimize hatch cover structure in the present paper, and the numerical calculation model of hatch cover structure was established. The target function is the structure gravity of hatch cover, there are three kinds of constraints: yielding strength, rigidity and buckling strength. The hydraulic hatch cover has been optimized under multiple loads, the numerical calculation results meet the design requirements.

Characteristics of a Self-Lubricated Stepped Thrust Pad of Infinite Width With Compressible Lubricant

1959 ◽  
Vol 81 (2) ◽  
pp. 135-145 ◽  
Author(s):  
Kikuo C. Kochi
Keyword(s):  
Optimum Design ◽  
Practical Interest ◽  
Numerical Data ◽  
Numerical Results ◽  
Design Parameters ◽  
Analytic Expressions ◽  
Thrust Pad ◽  
Compressible Lubricant

Harrison’s equation for the pressure in a gas-lubricated bearing of infinite width is solved for a thrust pad with stepped configuration. Analytic expressions for the pressure and load are developed. Numerical results are presented graphically. The analytic expressions together with the numerical data permit most of those characteristics of the stepped pad of practical interest to be completely determinable. Determination of optimum design parameters is given by a pair of graphs.

An optimum design study of the yarn-channel shape of the air-interlacing nozzle by analysis of fluid flow

2012 ◽  
Vol 82 (5) ◽  
pp. 474-483 ◽  
Author(s):  
Makhsuda Juraeva ◽  
Dong Joo Song ◽  
Kyung Jin Ryu
Keyword(s):  
Fluid Flow ◽  
Optimum Design ◽  
Design Study ◽  
Channel Shape

Research on Optimization for Reinforcement of Structures

2012 ◽  
Vol 517 ◽  
pp. 801-808 ◽  
Author(s):  
Jun Hu ◽  
Zhi Yong Yang ◽  
Song Zhao ◽  
Shun Hui Liu
Keyword(s):  
Quantitative Analysis ◽  
Hamming Distance ◽  
Optimal Model ◽  
Analytic Hierarchy ◽  
Structural Reinforcement ◽  
The Optimizing Model ◽  
Optimizing Model ◽  
Set Up ◽  
Intuitive Method ◽  
Hierarchy Process

The choice of structural reinforcement, such as increasing cross-section, steel-bonded, carbon fiber reinforced and etc, is affected by many factors. How to create optimal model is a major unresolved issues for designers to decide more scientific and rational structural reinforcement. The research obtains the weight of factors by Analytic Hierarchy Process and ascertains relative membership degree of factors by theory of Fuzzy Mathematics, and transforms qualitative impact of these factors into quantitative analysis, then the optimizing model is set up by The Generalized Hamming Distance as p=1 which is analyzed by an actual engineering that we can certificate the model valuable and useful. The research provides a simple and intuitive method of quantitative analysis for reinforcement by establishing optimization model, especially for both multi-objective and multi-factor decision-making, and overcome the arbitrariness when determining the reinforcement.

A Unified Multidisciplinary Optimum Design Method Using Genetic Algorithms

1994 ◽  
Author(s):  
Hiroshi Yamakawa
Keyword(s):  
Genetic Algorithms ◽  
Optimum Design ◽  
Design Process ◽  
Design Method ◽  
Numerical Results ◽  
Hierarchical System ◽  
Engineering Analysis ◽  
Design Processes ◽  
Strong Interest

Abstract Multidisciplinary optimum designs have been of strong interest lately in many fields. A unified multidisciplinary optimum design method by utilizing the genetic algorithms is presented in this study. The design process is modeled there by a distributed hierarchical system to simulate ordinary design processes. Each level is optimized by genetic algorithms somewhat independently but some information is transmitted to the upper or the lower level. Engineering analysis can also be involved in a certain level. The proposed method is then applied to simple examples of preliminary designs of cars and numerical results show the effectiveness of the method.

Research on Mechanical Properties and Structural Optimum Design of Aluminum Sheets-with-Ribs

2014 ◽  
Vol 933 ◽  
pp. 272-275
Author(s):  
Ning Liu
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Optimum Design ◽  
Modeling Method ◽  
Element Modeling ◽  
Aluminum Sheets ◽  
Reasonable Approach ◽  
Structure Strength

s. Aluminum Sheets-with-ribs has many advantages. The problems of hull weight and structure strength of ACV have been solved by the application of aluminum sheets-with-ribs. The mechanical properties of different aluminum sheets-with-ribs have been compared in this paper, the finite element modeling method of sheets-with-ribs structure in ACV has been studied, and a simplified and reasonable approach has been proposed.

scholarly journals Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

Cerâmica ◽  
2010 ◽  
Vol 56 (338) ◽  
pp. 201-211 ◽  
Author(s):  
Z. C Silveira ◽  
R Nicoletti ◽  
C. A Fortulan ◽  
B. M Purquerio
Keyword(s):  
Load Capacity ◽  
Sucrose Concentration ◽  
Porous Matrix ◽  
Numerical Results ◽  
Homogeneous Distribution ◽  
Average Pore ◽  
Porous Bearing ◽  
Bearing Load ◽  
The Mathematical Model ◽  
Ceramic Matrices

This paper presents the development of an advanced ceramic material for manufacturing aerostatic porous bearing. The results show that there is homogeneous distribution of the pores in the alumina matrix by using different concentrations of the added component (sucrose). The average pore diameter remained around 0.14 µm and respective porosity around 28%, with small standard deviation. The mathematical model of the aerostatic porous bearing is presented, and numerical results indicate that the parameter related to porous medium (Г) strongly affects the resultant bearing load capacity and stiffness. Considering the experimental and numerical results, the porous matrix obtained with 40% of sucrose concentration is more suitable for the aerostatic porous bearing application in study.

Stress Analysis and Life Estimation of Staged Prestressed Combined Cavity Die

2011 ◽  
Vol 418-420 ◽  
pp. 1796-1799
Author(s):  
Zhi Peng Lv ◽  
Xiu Hua Ma ◽  
Si Zhu Zhou
Keyword(s):  
Finite Element ◽  
Optimization Theory ◽  
Working Life ◽  
Element Model ◽  
Wear Model ◽  
Height Difference ◽  
Life Estimation ◽  
Structure Strength ◽  
The Finite Element Model ◽  
Main Factor

According to the structure strength optimization theory, each cavity die layer’s size and inter layer interference were obtained by using the Lame formula. The end angle and height difference were introduced into the finite element model, and a new and reasonable staged inclined end prestressed combined cavity die have been designed. The cavity die’s working life was forecasted by wear model and fatigue fracture model, and the conclusion was acquired that fatigue is the main factor to destroy the cavity die.

Optimum Design Technique for Rotating Wheels

1988 ◽  
Vol 110 (1) ◽  
pp. 41-44
Author(s):  
T. Hattori ◽  
H. Ohnishi ◽  
M. Taneda
Keyword(s):  
Optimum Design ◽  
Pressure Ratio ◽  
Axial Flow ◽  
Rotating Disk ◽  
Design System ◽  
Design Technique ◽  
Gas Temperature ◽  
Design Program ◽  
Bearing Load ◽  
Flow Compressor

Compressor rotors and turbine rotors are subject to centrifugal and thermal loads. These loads increase proportionally with tip speed, pressure ratio, and gas temperature. On the other hand, the rotor weight must be lessened to improve rotor dynamics and restrict bearing load. Thus, an optimum design technique is required, which offers the lightest possible wheel shape under the stress limit restriction. This paper introduces an optimum design system developed for turbomachinery rotors, and discusses several application results. The sequential linear programming method is used in the optimizing process, and centrifugal and thermal stress analyses of variable thickness rotating wheels are performed using Donath’s method. This system’s validity is confirmed by application to uniform-strength rotating disk problems and comparison with analytical results. This optimum design program is then applied to the design of axial flow compressor wheels.

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