Modifications and Improvements in a Structural Optimization Scheme Based on an Optimality Criterion.

1978 ◽  
Author(s):  
S. C. McIntosh ◽  
Jr
Keyword(s):  
Structural Optimization ◽  
Optimality Criterion ◽  
Optimization Scheme

An Optimality Criterion for the Structural Optimization of Machine Elements

2005 ◽  
Vol 127 (3) ◽  
pp. 415-423 ◽  
Author(s):  
C.-P. Teng ◽  
J. Angeles
Keyword(s):  
Structural Optimization ◽  
Optimality Criterion ◽  
Mass Reduction ◽  
Speed Reduction ◽  
Optimum Dimension ◽  
Novel Approach ◽  
Cam Follower ◽  
Machine Elements ◽  
A Current

Methods of structural optimization have been studied and developed over the last three decades. An important aspect of structural optimization pertains to the condition under which the loads are applied. Most machine structures in operation are subject to loads varying as functions of time. In this paper, a novel approach is proposed to cope with loads whose magnitudes vary within given bounds and with variable directions. The underlying ideas are applied to the structural optimization of the roller-carrying disk of a novel class of cam-follower speed reduction devices termed Speed-o-Cam (SoC). Results obtained in this paper are compared with a current prototype and with an intermediate design in which the dimensions of the roller pins are optimized. Combined with the optimum dimension of the roller pins, our structural-optimization results lead to an improvement of almost twice the stiffness with a mass reduction of 40% of the original prototype.

scholarly journals Three-Bar structure optimality criterion using the linear resizing rule

2021 ◽  
Author(s):  
José Alfredo Ramírez Monares ◽  
Jesús Israel Hernández Hernández
Keyword(s):  
Structural Optimization ◽  
Static Analysis ◽  
Optimization Model ◽  
Optimality Criterion ◽  
Minimum Mass ◽  
Design Variables ◽  
Inclination Angles ◽  
Optimization Rule

The static analysis of the indeterminate three-bar structure is developed using the Castigliano's first theorem, taking the lengths and inclination angles as variables. Some reductions are applied in the resulting set of equations to approximate them to the references models. From now on, the minimum mass optimization model with restrictions is established. Then, the Optimality Criterion linear resizing optimization rule algorithm for the unbounded and bounded design variables is applied in two numerical cases. The analytical and Matlab Optimization Toolbox results are also obtained and they demonstrate the Optimality Criterion linear resizing rule effectiveness in structural optimization with a minimum mass objective and size restrictions.

scholarly journals Optimal Design of Cymbal Stack Transducer in a Piezoelectric Linear Actuator by Finite Element Method

2015 ◽  
Vol 2 (3-4) ◽  
pp. 169-176
Author(s):  
Wen Sheng ◽  
Zhang Tiemin ◽  
Zhang Jiantao ◽  
Yang Xiuli
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimal Design ◽  
Structural Optimization ◽  
Structural Parameters ◽  
Initial Configuration ◽  
Response Analysis ◽  
Linear Actuator ◽  
Optimization Scheme ◽  
Element Method

Abstract The optimal design of a piezoelectric linear actuator using parametric optimum method-based finite element method (FEM) was presented. First, the FEM model of the cymbal stack transducer was generated with its initial configuration. The structural parameters were chosen as the design variables and the displacement on the top surface of the transducer taken as the objective function. Second, the zero-order optimization method was chosen as the basic tool of the structural updating. The structural optimization scheme of the cymbal stack transducer was carried out based on ANSYS parametric design language (APDL). Finally, an example of dynamic response analysis was performed on the cymbal stack transducer to verify the structural optimization scheme. The results show that the displacement on the top surface is increased by 32.9% compared with the case of initial configuration.

Grillage Structural Optimization Based on Genetic Algorithm and Mechanical Direct Calculation

2014 ◽  
Vol 1061-1062 ◽  
pp. 1135-1139
Author(s):  
Xiao Ning Yao ◽  
Yu Long Zhou ◽  
Xin Sheng Zhang
Keyword(s):  
Genetic Algorithm ◽  
Structural Optimization ◽  
Optimization Design ◽  
Structural Strength ◽  
Structure Optimization ◽  
Direct Calculation ◽  
Optimization Scheme ◽  
Significant Time

In the process of using the genetic algorithm for grillage structural optimization, direct calculation was applied to grillage structural strength Check. The combination of genetic algorithm and direct calculation can save significant time in optimization design and strength check, at the same time, optimized grillage structure provides more security.And then this structure optimization scheme was programmed by VB with easy interface. The example indicates the program, being reasonable and feasible, proves the combination's superiority.

NWRAG, a New Algorithm for Structural Optimization

1987 ◽  
Author(s):  
M. No ◽  
J. M. Aguinagalde
Keyword(s):  
Nonlinear System ◽  
Structural Optimization ◽  
Optimality Conditions ◽  
Design Problem ◽  
Optimality Criterion ◽  
System Of Equations ◽  
Nonlinear System Of Equations ◽  
Design Variables ◽  
Active Design ◽  
Better Than

Abstract This paper presents an algorithm to solve the optimum design problem for general structures. The algorithm is based on the solution of the nonlinear system of equations derived from the Kuhn-Tucker optimality conditions. Sets of active design variables and active behaviour constraints are used. Some practical examples are presented to show how NWRAG performs better than other optimality criterion based algorithms for structures involving bending effects.

Sign in / Sign up

Export Citation Format

Share Document