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About 10,000 papers for “Structural Analysis and Optimization”

Optimization in Structural Analysis and Design

Yusuf Cengiz Toklu · Structures Congress 2009 · 2009

Two main tasks of a structural engineer, as for many other branches of engineering, are analysis and design. Among these two, the latter needs more knowledge, skill and experience. It even comprises completely the first one, that is, a designer must already have the capacity of analysis. There are two technical tools to be used in these two tasks. One of them is finding solution(s) to equilibrium equations of the form Ax = b where A and b are known, x is unkown. For nonlinear problems this equation becomes nonlinear without changing the main character of the problem: find x satisfying the nonlinear equations put forth. The second tool is optimization, i.e. to find x making Φ(x) optimum, either a maximum or minimum. If one is asked to allocate tools to tasks, the answer generally will be such that two pairs are to be formed: (analysis, equilibrium conditions by root finding), (design, optimization). In fact, this allocation can best be shown by forming a two by two matrix. In this matrix, the two locations corresponding to the pairs mentioned above will be the ones that have the highest usage. The location corresponding to (design, equilibrium) will not be empty because most design problems are solved after some successive equilibrium applications. The least used location will be (analysis, optimization). In fact, there seems to be a mistake in this emptiness of the location corresponding the the analysis of structures by using a formulation which based on optimization, because we all know that a structure, loaded in whatever manner, will take the configuration having the least total potential energy. Thus, to analyze a structure under some loading, it suffices to find its shape with the least potential. Once this shape is determined, all the displacements, deformations, strains, stresses, reactions etc. can be determined to complete the analysis. This idea is now gaining importance and enabling engineers to solve problems which were very difficult to solve by the accustomed methods. This means that optimization is enlarging its range of applicability from design part to analysis part. If one considers in this context the advantage of new techniques of optimization, like metaheuristic methods, one will realize that optimization will increase its importance in structural engineer's life both in analysis and design.

Cited by 7

Structural Analysis and Optimization of Pitman ARM

Shatabdee Sonawane, P. M. Sonawane · Zenodo (CERN European Organization for Nuclear Research) · 2020

Now a day's automotive OEM are concentrating on vehicles efficiency and cost effectiveness to reach out with competitors. In order to achieve cost effectiveness optimization of less critical components is necessary. Pitman arm seems to be an overdesigned part. Pitman arm used to steer vehicle is redesigned and modified for achieving less weight and thus cost. Reverse engineering technique is used to model existing pitman arm by CATIA V5 software. The structural optimization is done on the pitman arm using Optistruct tool. Structure of pitman arm is changed by removing the material from the surface where stress value is low. The testing of Pitman arm is carried out for static analysis and fatigue analysis and the results are compared with the experimental results. Static analysis results of existing pitman arm proved that the model is more stable and there was scope for optimization. The weight of original Pitman arm model was 974 gm and that of the new optimized model 840 gm. Weight of the Pitman arm after optimization is reduced by 14%. FEA of optimized Pitman arm has shown 1108.0 microstrain whereas that of the experimental testing shown 1024.39 microstrain. The comparison, between fatigue life results of existing and optimized pitman arm has been performed and it is observed that the pitman arm is having infinite life. The above study confirmed that optimized pitman arm is structurally stable with good fatigue life.

Cited by 0Open access

Geodesic Wing Structural Optimization and Dynamic Analysis

Young In Moon · 1996

Abstract : This report summarizes the construction of finite element models, validation of honeycomb finite element models, and preparation of a task road map for the future work. Finite element models were constructed based on two planform shapes. One is the planform of the intermediate complexity wing (ICW) model and the other is a rectangular (including square) planform. Two types of finite element models were generated in each planform: one has a honeycomb core with face sheets on top and bottom which are connected by rod elements while the other is a full-depth model, consisting of plates only. The finite element models of the honeycomb sandwich structures were compared to results from Hexcel Company verification models and to an actual test result. The road map for the task includes all the procedures necessary to perform the task efficiently, starting with model construction and validation of analytical predictions.

Cited by 1

Structural Analysis and Optimization of Pneumatic Components

Peter U. Post · 1994

Abstract Within the last few years engineering analysis and optimization methods became more and more reasonable in the development stage not only of specialised high-tech products but also of industrial standard components and systems. This trend is forced by establishing simultaneous engineering concepts in R&D-departments. Acceptance of these methods in industrial practice goes along with increasing power of solution procedures as well as reliability and ease-of-use of software implementations. This paper shows practical applications on the development of pneumatic actuators and control-components. Optimal design of cylinder housings and profile shapes as well as structural analysis and optimization of rubber elements with their non-linear structural behaviour due to hyperelastic material law, contacting surfaces and friction are discussed.

Cited by 1

Structural Analysis and Optimization of Pitman ARM

Shatabdee Sonawane · International Journal of Engineering Research and · 2020

Now a day's automotive OEM are concentrating on vehicles efficiency and cost effectiveness to reach out with competitors.In order to achieve cost effectiveness optimization of less critical components is necessary.Pitman arm seems to be an overdesigned part.Pitman arm used to steer vehicle is redesigned and modified for achieving less weight and thus cost.Reverse engineering technique is used to model existing pitman arm by CATIA V5 software.The structural optimization is done on the pitman arm using Optistruct tool.Structure of pitman arm is changed by removing the material from the surface where stress value is low.The testing of Pitman arm is carried out for static analysis and fatigue analysis and the results are compared with the experimental results.Static analysis results of existing pitman arm proved that the model is more stable and there was scope for optimization.The weight of original Pitman arm model was 974 gm and that of the new optimized model 840 gm.Weight of the Pitman arm after optimization is reduced by 14%.FEA of optimized Pitman arm has shown 1108.0 microstrain whereas that of the experimental testing shown 1024.39 microstrain.The comparison, between fatigue life results of existing and optimized pitman arm has been performed and it is observed that the pitman arm is having infinite life.The above study confirmed that optimized pitman arm is structurally stable with good fatigue life.

Cited by 1Open access

Structural Analysis and Optimization for Turret Body

Longmiao Chen · 2009

Dynamic response of self-propelled howitzer turret body during firing was analyzed with finite element method.In view of the requirement of weight reduction and the state that middle and back portion of the turret body was in low stress state,optimization model was built,and the optimum solution was obtained based on multi-island genetic algorithm.Contrasts of dynamic response before and after optimization were done,and simulation result shows that mass of the turret body decreases by 10.01% with the structure stiffness and strength little unchanged.

Cited by 1

Structural Analysis and Optimization of Pitman ARM

Shatabdee Sonawane, P. M. Sonawane · Zenodo (CERN European Organization for Nuclear Research) · 2020

Now a day's automotive OEM are concentrating on vehicles efficiency and cost effectiveness to reach out with competitors. In order to achieve cost effectiveness optimization of less critical components is necessary. Pitman arm seems to be an overdesigned part. Pitman arm used to steer vehicle is redesigned and modified for achieving less weight and thus cost. Reverse engineering technique is used to model existing pitman arm by CATIA V5 software. The structural optimization is done on the pitman arm using Optistruct tool. Structure of pitman arm is changed by removing the material from the surface where stress value is low. The testing of Pitman arm is carried out for static analysis and fatigue analysis and the results are compared with the experimental results. Static analysis results of existing pitman arm proved that the model is more stable and there was scope for optimization. The weight of original Pitman arm model was 974 gm and that of the new optimized model 840 gm. Weight of the Pitman arm after optimization is reduced by 14%. FEA of optimized Pitman arm has shown 1108.0 microstrain whereas that of the experimental testing shown 1024.39 microstrain. The comparison, between fatigue life results of existing and optimized pitman arm has been performed and it is observed that the pitman arm is having infinite life. The above study confirmed that optimized pitman arm is structurally stable with good fatigue life.

Cited by 0Open access

Structural Analysis and Optimization of Pitman Arm

Sujit P. Narwade, Balaji D. Kshirsagar, Subim Khan et al. · International Journal of Engineering Sciences · 2021

Now a day’s increases in vehicle demand at a lower rate are necessity of vehicle manufacture. Expectation in terms of durability, efficiency and cost is raising exponentially by customers. Over designed components in vehicle leads to increase weight and reduced efficiency. Pitman arm used to steer vehicle can be redesigned and modified for achieving less weight and thus cost. Existing pitman arm component available in market will be reverse engineered and CAD modeled using CATIAV5software.Finiteelement Discretization & Analysis will be carried out using Ansys package. FEA will help in finding out high strain locations in component and also defining area which can be modified. Strain gauging will be done on areas of high strain location indicated by FEA software. Fixture will be designed for mounting component on UTM. Machining will be done to remove excess material from component. Comparative analysis will be done between experimental and FEA results. Conclusion and future scope will be suggested.

Cited by 1Open access

Structural Reliability Analysis and Optimization: Use of Approximations

Wang, Liping, Grandhi, Ramana V. · NASA Technical Reports Server (NASA)

This report is intended for the demonstration of function approximation concepts and their applicability in reliability analysis and design. Particularly, approximations in the calculation of the safety index, failure probability and structural optimization (modification of design variables) are developed. With this scope in mind, extensive details on probability theory are avoided. Definitions relevant to the stated objectives have been taken from standard text books. The idea of function approximations is to minimize the repetitive use of computationally intensive calculations by replacing them with simpler closed-form equations, which could be nonlinear. Typically, the approximations provide good accuracy around the points where they are constructed, and they need to be periodically updated to extend their utility. There are approximations in calculating the failure probability of a limit state function. The first one, which is most commonly discussed, is how the limit state is approximated at the design point. Most of the time this could be a first-order Taylor series expansion, also known as the First Order Reliability Method (FORM), or a second-order Taylor series expansion (paraboloid), also known as the Second Order Reliability Method (SORM). From the computational procedure point of view, this step comes after the design point identification; however, the order of approximation for the probability of failure calculation is discussed first, and it is denoted by either FORM or SORM. The other approximation of interest is how the design point, or the most probable failure point (MPP), is identified. For iteratively finding this point, again the limit state is approximated. The accuracy and efficiency of the approximations make the search process quite practical for analysis intensive approaches such as the finite element methods; therefore, the crux of this research is to develop excellent approximations for MPP identification and also different approximations including the higher-order reliability methods (HORM) for representing the failure surface. This report is divided into several parts to emphasize different segments of the structural reliability analysis and design. Broadly, it consists of mathematical foundations, methods and applications. Chapter I discusses the fundamental definitions of the probability theory, which are mostly available in standard text books. Probability density function descriptions relevant to this work are addressed. In Chapter 2, the concept and utility of function approximation are discussed for a general application in engineering analysis. Various forms of function representations and the latest developments in nonlinear adaptive approximations are presented with comparison studies. Research work accomplished in reliability analysis is presented in Chapter 3. First, the definition of safety index and most probable point of failure are introduced. Efficient ways of computing the safety index with a fewer number of iterations is emphasized. In chapter 4, the probability of failure prediction is presented using first-order, second-order and higher-order methods. System reliability methods are discussed in chapter 5. Chapter 6 presents optimization techniques for the modification and redistribution of structural sizes for improving the structural reliability. The report also contains several appendices on probability parameters.

Cited by 0Open access

Influence of Structural and Aerodynamic Modeling on Flutter Analysis and Structural Optimization

Alfred G. Striz · 1991

Abstract : The influences of structural and aerodynamic modeling on the flutter analysis and multidisciplinary optimization of fully built-up finite element wing models in an aeroelastic environment are not yet well understood. Therefore, the dynamic aeroelastic and optimization capabilities in the Automated Structural Optimization System (ASTROS) were used to evaluate the flutter behavior and the behavior of structural optimization with flutter constraints of various representative fully built-up finite element wing models in subsonic and supersonic flow. ASTROS was here used as a tool to calculate flutter speeds and frequencies and to minimize the weight of these wing models in subsonic and supersonic flow under given flutter and frequency constraints to determine the effect that these modeling factors have. Structures, ASTROS, Aeroelasticity, Modelling, Optimization.

Cited by 3

Structural analysis and optimization of ash hopper design

Punkkinen, Lassi · LUTPub (LUT University) · 2021

The purpose of this thesis is to research and develop the design and dimensioning of boiler ash hoppers by analyzing existing hoppers and applying relevant steel structure standards. The goal is also to optimize the mass and manufacturing costs of hoppers and harmonize the calculation. 
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\nUnlike for pressure parts of the boiler, there is no direct standard that would set explicit design requirements for ash hoppers. The design criteria of the hopper were set by applying Eurocode-standards and basic strength of materials. The requirements related to loads are obtained partly from standards and product-specifically from Valmet. 
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\nAsh hopper is a welded plate structure that is mainly subjected to out-of-plane pressure loads. The thesis presents the basic theory needed in the calculation of hopper structures including the dimensioning of stiffened plates, stiffeners, and welds. Considering the high temperatures is also an important aspect in the analysis of ash hoppers. 
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\nThe structural analysis of ash hoppers was primarily done with FE-analysis. Simplified analytical calculations were additionally applied and results were verified by comparison. Different design constructions were compared by analyzing an example hopper. The structure could be generally enhanced by optimizing the placement of stiffeners, modifying design details, and reducing the amount of welding. Based on the results of this thesis, a dimensioning tool was developed for determining the basic design parameters for ash hoppers. Future development ideas and potential improvement areas are discussed at the end of the thesis.

Cited by 0

Database Design for Structural Analysis and Design Optimization.

Jasbir S. Arora, Haririan, M, Paeng, J K et al. · Defense Technical Information Center (DTIC) · 1984

This report presents a procedure for design of database for structural analysis and design optimization. The procedure involves three distinct steps: (i) collection of information, (ii) analysis of data flow and (iii) identification of relations and data sets. The procedures is used to design a data base for analysis and design of systems for linear, nonlinear, static and dynamic responses. Databases of two existing analysis programs, ADINA and GIFTS, are studied to gain insights into their designs. These are the state-of-the-art analysis programs that create large databases. However their database management systems are tightly coupled to the program management that has been implemented on the PRIME system is described. The system implements both the numerical and relational data models. These models are judged to be more suitable for engineering applications. A detailed description of the capabilities of the system is presented. Using this system, the proposed database design will be implemented and evaluated in the future.

Cited by 0

Structural Analysis and Optimization of Combine Harvester Frame

Fu Qiang Li, Shou Rong Liu, En Rong Mao et al. · Applied Mechanics and Materials · 2014

Parameterized model of combine harvester frame is created using the DM module of ANSYS Workbench in this paper. Analysis on the strength and stiffness of the frame is implemented to estimate its safety and economy. According to the analysis result, optimization is made to save material appropriately. Modal analysis of the frame is proceeded to study its natural frequency and compare it with external excitation frequency.

Cited by 2

Strength analysis and structural optimization of UAV airframe

L. Ye, Yanpeng Zhao, Haifeng Zhang et al. · Frontiers in Mechanical Engineering · 2025

Introduction With the booming low-altitude economy, UAVs drive transformative changes across sectors, but their design must balance lightweight demands and structural integrity. This study conducts static analysis of a quadrotor under hovering, using two optimization methods to enhance performance. Methods Two strategies were adopted: mass-constrained structural optimization (maintaining original mass) and unconstrained stiffener optimization (maximizing stiffness/strength without mass limits). Results Mass-constrained optimization reduced max von Mises stress by 38.8% and displacement from 6.49 mm to 5.91 mm. Unconstrained stiffener optimization achieved 5.2% mass reduction, 60.9% stress reduction, and displacement down to 1.63 mm. Discussion Both methods maintain structural strength and boost payload capacity. The stiffener optimization (reinforced rib design) provides a practical solution for heavy-load quadrotor engineering.

Cited by 0Open access

Analysis and optimization of a structural seat plate

Yi Yao, Lebin Tan · 2023

To solve the stress concentration problem of the seat plate when shooting on hard ground, the structural design of the mortar seat plate was redesigned. On the premise of ensuring shooting form and stability under soft soil, surface support was used to reduce the maximum stress under hard soil. For the three-dimensional modeling of the new structure's seat plate, a suitable soil constitutive model was selected to draw more accurate conclusions, and the chamber pressure curve of the internal ballistic of the mortar was calculated. The finite element analysis software was used to analyze the Stress distribution in the state. To further reduce the weight of the seat plate and improve its strength of the seat plate, a multi-objective optimization based on a genetic algorithm was carried out. The optimized seat plate significantly reduces mass with reduced maximum stress.

Cited by 0