Optimum Structural Design of Naval Vessels

2003 ◽  
Vol 40 (03) ◽  
pp. 149-157
Author(s):  
Seo Seung II ◽  
Son Keon Ho ◽  
Park Myung Kyu
Keyword(s):  
Structural Analysis ◽  
Structural Design ◽  
Design Method ◽  
Design Standards ◽  
Naval Vessel ◽  
Main Design ◽  
Optimum Structural Design ◽  
Design Variables ◽  
Analysis Theory ◽  
The U.S

Naval vessels are not regulated by class rules, but by special regulations. This study introduces the concept and characteristics of the regulations of the U.S. Navy, which has been the most reliable in setting design standards of naval vessels and helps designers comprehend the effect of each regulation on design results. Also, an optimum structural design method combined with structural analysis theory is proposed for an actual naval vessel to be designed according to U.S. Navy regulations. The validity of the proposed method is shown by the optimum design results for the midship section. The optimum spacings of longitudinal and transverse web frames are found, and the effect of the main design variables is investigated.

Strength Model Uncertainties of Burst, Yielding, and Excessive Bending of Piping

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Kleio Avrithi ◽  
Bilal M. Ayyub
Keyword(s):  
Structural Design ◽  
Design Method ◽  
Strength Model ◽  
Allowable Stress ◽  
Model Uncertainties ◽  
Reliability Based Design ◽  
Design Variables ◽  
Strength Models ◽  
Potential Use ◽  
Allowable Stress Design

Nuclear safety-piping is designed according to the ASME Boiler and Pressure Vessel Code, Sections III, NB-, NC-, and ND-3600 that use the allowable stress design method (ASD). The potential use instead of reliability-based design equations for nuclear piping could benefit the structural design by providing, among others, consistent reliability levels for piping. For the development of such equations, not only the probabilistic characteristics of the design variables are needed, but also the quantification of the uncertainties introduced by the strength models that are used in order to estimate the resistance of pipes subjected to different loadings. This paper evaluates strength models, and therefore provides necessary information for the reliability-based design of pipes for burst or yielding due to internal pressure and for excessive bending.

Set-Based Design Method for the Early Phase Design of Structures With Uncertainties

2010 ◽  
Author(s):  
Masato Inoue ◽  
Yutaka Hattori ◽  
Haruo Ishikawa
Keyword(s):  
Structural Design ◽  
Early Phase ◽  
Design Method ◽  
Analysis Tool ◽  
Design Variables ◽  
Point Solution ◽  
Design Solutions ◽  
Set Based Design ◽  
Express Information ◽  
Analyze Structure

Since an early phase of design intrinsically contains uncertainties from various sources of variations, design performances are fluctuating or reflect uncertainty caused by uncertain design variables. Analysis tool such as finite element method (FEM) is useful for structural analysis. However, using unique point solution does not express information about uncertainties. Designers need to figure out an outline of the structural feature and have to obtain a design idea under some uncertain design information in a structural design at the early phase of design. We have proposed a preference set-based design (PSD) method that generates a ranged set of design solutions that satisfy sets of performance requirements. This study proposes a structural design method for the early phase of design based on the PSD method that is possible to analyze structure with design uncertainty by elastic FEM and obtain a ranged set of design solutions. That is, a design method for analyzing structures and obtaining a ranged set of design solutions with uncertainties of material property and dimension of structure (coordinates of geometry) under fluctuating distribution of performance characteristics of stress and displacement is proposed. In order to illustrate the availability of our approach, design problem of 3-dimensional truss structure is solved.

Optimal Structural Frequency Design of Stiffened Shell

2012 ◽  
Vol 157-158 ◽  
pp. 1636-1639 ◽  
Author(s):  
Da Hai Mi ◽  
Rui Yang ◽  
Liang Zhou ◽  
Yang Liu ◽  
Dong Ming Guo
Keyword(s):  
Structural Design ◽  
Design Method ◽  
Frame Structure ◽  
Size Optimization ◽  
Optimum Structure ◽  
Regular Grid ◽  
Stiffened Shell ◽  
Evolutionary Structural Optimization ◽  
Design Variables ◽  
Test Models

Frequency-aimed optimal structural design of stiffened shell is concerned. It is a reverse design problem for the first several modal frequencies to converge to a set of target value. A design method combined modified bi-directional evolutionary structural optimization (BESO) and size optimization is presented. Optimization model consists of skin and regular grid frame structure. To solve irregular branches and holes that often exist in ordinary topology optimization results, instead of elements, the existence states of ribs in the frame are used as design variables and sensitivity of the rib is discussed. Detailed design is conducted by size optimization. Example shows that frequency requirements are achieved. And the optimum structure is regular and clear, the localized modes problem is avoid. This is very suitable for designing airplane wind tunnel flutter test models.

Sensitivity Analysis of DVG850 High-Speed Vertical Machining Center Headstock

2011 ◽  
Vol 65 ◽  
pp. 79-83
Author(s):  
Gong Xue Zhang ◽  
Bing Bing Han ◽  
Chao Feng Liu ◽  
Yu Fang Gu ◽  
Xiao Kai Shen
Keyword(s):  
Sensitivity Analysis ◽  
Structural Design ◽  
High Speed ◽  
Operating Conditions ◽  
Dynamic Capability ◽  
Main Design ◽  
Design And Optimization ◽  
First Order ◽  
Machining Center ◽  
Design Variables

The headstock is one of the most important parts of a machining center, however there are a lot of designing variables that may influence the static and dynamic capability of the headstock. How to find these variables and optimize them seems to be very important. In this paper, using the modal frequency as the performance index, Pro/Mechanical was used to analyse the sensitivity of the DVG850 high-speed vertical machining center headstock. The result of the analysis was a set of main design-variables that influence the first-order natural frequency of the headstock. The machine’s typical operating conditions were compared against the results of the sensitivity analysis. This provided a basis for structural design and optimization of the headstock directly and quickly.

Parametric, grammatical, and perceptual iterations on structural design synthesis

2018 ◽  
Vol 32 (3) ◽  
pp. 269-281
Author(s):  
Rizal Muslimin
Keyword(s):  
Structural Analysis ◽  
Structural Design ◽  
Design Method ◽  
Computational Design ◽  
Shape Grammar ◽  
Structural Topology ◽  
Design Synthesis

AbstractThis paper presents a computational design method to analyze and synthesize representation mechanisms in structural design. The role of shape grammar schemas in analyzing parametric and grammatical structural analysis is discussed, and a set of schema to generate novel structural topology is provided.

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

Innovative Use of Profiled Steel Plates for Seismic Structural Performance

2005 ◽  
Vol 8 (3) ◽  
pp. 247-257 ◽  
Author(s):  
Y. Fukumoto ◽  
T. Takaku ◽  
T. Aoki ◽  
K. A. S. Susantha
Keyword(s):  
Numerical Analysis ◽  
Seismic Performance ◽  
Structural Design ◽  
Design Method ◽  
Steel Plates ◽  
Structural Performance ◽  
Cyclic Testing ◽  
Beam Columns ◽  
Bridge Bents ◽  
Hot Rolled

This paper presents the innovative use of hot-rolled thickness-tapered mill products, longitudinally profiled (LP) plates, for the seismic performance of bridge bents of single and portal framed piers. The study involves the inelastic cyclic testing and numerical analysis of tested beam-columns and portal frames in order to evaluate the effects of tapering ratios of LP plates, penetration of yielding, and number of locally buckled panels on their structural ductility. A structural design method is proposed for the portal frames having LP panels under cyclic loadings.

Optimization Research on Dynamic Balance of Spatial Engine under Limiting Shaking Moment

2009 ◽  
Vol 626-627 ◽  
pp. 693-698
Author(s):  
Yong Yong Zhu ◽  
S.Y. Gao
Keyword(s):  
Mathematical Model ◽  
Objective Function ◽  
Kinetic Analysis ◽  
Optimization Design ◽  
Design Method ◽  
Dynamic Balance ◽  
Optimized Design ◽  
Design Variables ◽  
The Mathematical Model ◽  
Shaking Moment

Dynamic balance of the spatial engine is researched. By considering the special wobble-plate engine as the model of spatial RRSSC linkages, design variables on the engine structure are confirmed based on the configuration characters and kinetic analysis of wobble-plate engine. In order to control the vibration of the engine frame and to decrease noise caused by the spatial engine, objective function is choosed as the dimensionless combinations of the various shaking forces and moments, the restriction condition of which presents limiting the percent of shaking moment. Then the optimization design is investigated by the mathematical model for dynamic balance. By use of the optimization design method to a type of wobble-plate engine, the optimization process as an example is demonstrated, it shows that the optimized design method benefits to control vibration and noise on the engines and improve the performance practically and theoretically.

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