First Order Analysis for Automotive Designs

2001 ◽  
Author(s):  
Yoshio Kojima ◽  
Hidekazu Nishigaki ◽  
Hideki Sugiura ◽  
Shinji Nishiwaki ◽  
Noboru Kikuchi
Keyword(s):  
Optimization Method ◽  
Order Analysis ◽  
First Order ◽  
Mechanics Of Materials ◽  
Complex Functions ◽  
Reduce Development Time ◽  
New Type ◽  
Basic Ideas ◽  
Prototype Software ◽  
Structural Mechanisms

Abstract In current automotive development, innovations to reduce development time and to use a virtual prototype have been numerous and progressive. Computer Aided Engineering (CAE) has played an important role in these innovations. CAE numerically estimates the performance of automobiles and proposes alternative ideas that lead to higher performance without building physical prototypes. However, current CAE can not usually be used at the initial design phase due to their difficult, and complex functions and characteristics. In this paper, we propose a new type of CAE, First Order Analysis (FOA). The basic ideas include: (1) graphic interfaces using Microsoft /Excel to achieve a product-oriented analysis, (2) use of mechanics of materials to provide useful information regarding structural mechanisms, and (3) a topology optimization method using function oriented elements. Also, some prototype software is presented to confirm the applicability of method presented here to the automotive designs.

First Order Analysis for Automotive Body Structure Design

2000 ◽  
Author(s):  
Hidekazu Nishigaki ◽  
Shinji Nishiwaki ◽  
Tatsuyuki Amago ◽  
Noboru Kikuchi
Keyword(s):  
Optimization Method ◽  
Structure Design ◽  
Optimal Designs ◽  
Body Structure ◽  
Analysis Model ◽  
Microsoft Excel ◽  
Order Analysis ◽  
First Order ◽  
Automotive Body ◽  
Basic Ideas

Abstract The concept of Computer Aided Engineering (CAE) was first proposed by J. Lemon at SDRC, and has been widely accepted in automotive industries. CAE numerically estimates the performance of automobiles and proposes alternative ideas that lead to the higher performance without building prototypes. However, most automotive designers cannot directly utilize CAE since specific well-trained engineers are required to achieve sophisticated operations. Moreover, CAE requires a huge amount of time and many modelers to construct an analysis model. In this paper, we propose a new concept of CAE, First Order Analysis (FOA), in order to overcome these problems and to quickly obtain optimal designs. The basic ideas include (1) graphic interfaces for automotive designers using Microsoft/Excel (2) use of sophisticated formulations based on the theory of mechanics of material, (3) the topology optimization method. Further, some prototypes of software are presented to confirm the method for FOA presented here.

Modular Structural Component Design Using the First Order Analysis and Decomposition-Based Assembly Synthesis

2001 ◽  
Author(s):  
Onur L. Cetin ◽  
Kazuhiro Saitou ◽  
Hidekazu Nishigaki ◽  
Shinji Nishiwaki ◽  
Tatsuyuki Amago ◽  
...  
Keyword(s):  
Optimization Method ◽  
Two Dimensional ◽  
Order Analysis ◽  
First Order ◽  
Automotive Body ◽  
Automated Method ◽  
Trade Offs ◽  
Component Design ◽  
Module Geometry ◽  
Topology Optimization Method

Abstract This paper discusses an automated method for designing modular components that can be shared within multiple structural products, such as automotive bodies for sibling vehicles. The method is an extension of the concept of decomposition-based assembly synthesis. A beam-based topology optimization method, originally developed for First Order Analysis (FOA) of the automotive body structures, is utilized in order to obtain the “base” structures subject to decomposition. It is expected that the method will facilitate the early decisions on module geometry in automotive body structures, by enhancing the capability of the FOA system. Several case studies with two-dimensional structures are reported to demonstrate the effectiveness of the proposed method. The results indicate that two structures optimized for a similar, but slightly different boundary loading conditions are successfully decomposed to contain a component that can be shared by the structures. Several Pareto optimal decompositions are presented to illustrate the trade-offs among multiple decomposition criteria, with different weights for each objective function.

Structural Topology Optimization Using Function-Oriented Elements Based on the Concept of First Order Analysis

2003 ◽  
Author(s):  
Akihiro Takezawa ◽  
Shinji Nishiwaki ◽  
Kazuhiro Izui ◽  
Masataka Yoshimura
Keyword(s):  
Topology Optimization ◽  
Mechanical Design ◽  
Optimization Method ◽  
Structural Topology Optimization ◽  
Structural Topology ◽  
Order Analysis ◽  
First Order ◽  
Design Engineers ◽  
Optimization Methodology ◽  
And Function

Computer Aided Engineering (CAE) has been successfully utilized in mechanical industries, but few mechanical design engineers use CAE tools that include structural optimization, since the development of such tools has been based on continuum mechanics that limit the provision of useful design suggestions at the initial design phase. In order to mitigate this problem, a new type of CAE based on classical structural mechanics, First Order Analysis (FOA), has been proposed. This paper presents the outcome of research concerning the development of a structural topology optimization methodology within FOA. This optimization method is constructed based on discrete and function-oriented elements such as beam and panel elements, and sequential convex programming. In addition, examples are provided to show the utility of the methodology presented here for mechanical design engineers.

First Order Analysis for Automotive Body Structure Design-Part 2: Joint Analysis Considering Nonlinear Behavior

2004 ◽  
Author(s):  
Yasuaki Tsurumi ◽  
Hidekazu Nishigaki ◽  
Toshiaki Nakagawa ◽  
Tatsuyuki Amago ◽  
Katsuya Furusu ◽  
...  
Keyword(s):  
Nonlinear Behavior ◽  
Structure Design ◽  
Joint Analysis ◽  
Body Structure ◽  
Order Analysis ◽  
First Order ◽  
Automotive Body

Nonsmooth Optimization Method for Image Restoration

1995 ◽  
Author(s):  
Kazufumi Ito ◽  
Karl Kunisch
Keyword(s):  
Image Restoration ◽  
Nonsmooth Optimization ◽  
Numerical Optimization ◽  
Augmented Lagrangian ◽  
Energy Criterion ◽  
Optimization Methods ◽  
Optimization Method ◽  
Augmented Lagrangian Methods ◽  
Active Set ◽  
First Order

Abstract In this paper we discuss applications of the numerical optimization methods for nonsmooth optimization, developed in [IK1] for the variational formulation of image restoration problems involving bounded variation type energy criterion. The Uzawa’s algorithm, first order augmented Lagrangian methods and Newton-like update using the active set strategy are described.

Diagram based assessment strategy for first-order analysis of masonry arches

2019 ◽  
Vol 22 ◽  
pp. 122-129 ◽  
Author(s):  
Gabriel Stockdale ◽  
Gabriele Milani
Keyword(s):  
Masonry Arches ◽  
Assessment Strategy ◽  
Order Analysis ◽  
First Order

Radiant Panel Columns Magnetostrictive Transducers of Forced Vibration

2012 ◽  
Vol 588-589 ◽  
pp. 359-363
Author(s):  
Jian Ping Sun ◽  
Jian Xin Wang
Keyword(s):  
Forced Vibration ◽  
Radiation Effect ◽  
Optimization Methods ◽  
Motion Model ◽  
Spring Rate ◽  
Order Analysis ◽  
First Order ◽  
Radiant Panel ◽  
Magnetostrictive Transducer

the columns of magnetostrictive transducer for the object, the establishment of a Radiant Panel in magnetostrictive rods through the spring of motion model, gives a method for solving first-order analysis and solutions, discusses the spring rate on radiation effect of amplitude. On reasonable determination of Radiant Panel structure, the size of the transducer, and optimization methods.

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