Multi-Level Optimization Method for Vehicle Body in Conceptual Design

2015 ◽  
Author(s):  
Wenbin Hou ◽  
Chunlai Shan ◽  
Hongzhe Zhang
Keyword(s):  
Conceptual Design ◽  
Optimal Algorithm ◽  
Optimization Method ◽  
Design Tool ◽  
The Body ◽  
Vehicle Body ◽  
Concept Design ◽  
Cross Sectional ◽  
Design Engineers ◽  
Conceptual Design Phase

Since product development lead-time needs to be as short as possible in contemporary enterprises, it is necessary to assess and optimize the performance of the structure in conceptual design phase for avoiding the time consuming production of trial models for vehicle body. This paper proposes a conceptual design tool based on optimization algorithms for global body frames named Vehicle Concept Design-Intelligent CAE system (VCD-ICAE). A multilevel optimization algorithm is applied to optimize the body performance, decide the size parameters, and generate cross-sectional shapes that satisfy design engineers’ required characteristics. The global body stiffness and vibration property would be optimized while decreasing the mass of body. The paper describes the implementation of the optimal algorithm, and Genetic algorithms are applied to solve the optimization problem. A case of optimization for a real car is given to verify the validity of the algorithm.

Bi-Level Optimization for Cross-Sectional Size of Bus Body

2013 ◽  
Vol 437 ◽  
pp. 434-438 ◽  
Author(s):  
Jing Xin Na ◽  
Jian Feng Gao
Keyword(s):  
Line Search ◽  
Lightweight Design ◽  
Optimization Method ◽  
The Body ◽  
Design Stage ◽  
Concept Design ◽  
Body Frame ◽  
Cross Sectional ◽  
Multi Objective ◽  
Bus Body

A bi-level optimization method, integrating both local line search and overall multi-objective optimization, is proposed aiming to provide a solution for lightweight design of integral bus bodies. On the first level, the lightest structure under the strength condition is obtained via implementing line-search process in local bar models of the body frame based on the section libraries. On the second level, the design variables are screened by means of sensitivity analysis, and then the bus body structure is optimized by using the multi-objective genetic algorithm. This approach is implemented into an integral bus body frame during the concept design stage. It is verified that the obtained structure scheme is 10.57% lighter than the target bus model and the major mechanical performances are also better than the target one.

Conceptual Design Knowledge Management and the Semantic Web

2005 ◽  
Author(s):  
Joseph B. Kopena ◽  
Christopher D. Cera ◽  
William C. Regli
Keyword(s):  
Semantic Web ◽  
Conceptual Design ◽  
Automated Reasoning ◽  
Description Logic ◽  
Design Knowledge ◽  
Semantic Web Technology ◽  
Design Engineers ◽  
Conceptual Design Phase ◽  
Mechanical Devices ◽  
New Applications

The early stages of engineering design are critical, as the decisions made at this point have the most impact on the final product. However, little software is available to support engineers during the initial, conceptual design phase. In addition, at this and all other stages of design, engineers are increasingly tasked with utilizing unwieldy collections of data such as databases of legacy designs and catalogs. This work addresses both of these issues. A conceptual design interface with several advancements crucial to industrial deployment is developed and used to aid design. Among these are provisions for real-time collaboration and security. A representation of mechanical devices based on intended function is developed and used by the conceptual design interface to capture design semantics. This representation is defined using a description logic, enabling automated reasoning. The descriptions created using the conceptual design interface can thus be employed to annotate designs, create search queries, and to organize collections of designs. Further, this work incorporates Semantic Web technology, enabling conceptual design knowledge to be published and accessed effectively on the World Wide Web. New applications of design repositories are made possible by this but new issues must be investigated and addressed, as discussed here.

Function and Mechanism Formalization in Task Based Conceptual Design Method

2012 ◽  
Author(s):  
H. V. Darbinyan
Keyword(s):  
Conceptual Design ◽  
Mechanical Design ◽  
Design Method ◽  
General Concept ◽  
Design Tool ◽  
Concept Design ◽  
Scope Of Application ◽  
Core Idea ◽  
And Function ◽  
Mechanical Objects

Mechanism and function formalization problem is touched in a novel task based conceptual mechanical design method. The general concept and a specific application of this method were reported in earlier publications. Direct dependence between the function and mechanism, identical synthesis tools for various stages of design and for various mechanical objects are the features making the suggested method advantageously different from existing concept design approaches. The core idea of suggested conceptual design method is the direct relation between challenged function and the mechanical entity which is in charge of implementing the requested function. The existing task based conceptual design methods are not satisfying the designer’s needs for scope of application, universality of design means, visualization and formalization of both mechanical and functional fields. Formalization of functions and mechanisms is an important design tool that will facilitate synthesis, analyzes, visualization and archiving (data base creating) processes of mechanical development. Further progress in unveiling the resources of the suggested design method is mostly based on development of formalization means for both categories of functions and mechanisms. The current study is unveiling newly developed function and mechanism description language that is helping to formalize both mechanical and functional categories facilitating their involvement in design process and making the description of a new product’s mechanical development easy and understandable. Function formalization in conjunction with mechanism formalization allows to formulate precisely the design task and concentrate the designer’s attention on solution of a single task strictly arranged in the hierarchical function tree of all involved tasks and functions.

scholarly journals Conceptual Design for Assembly in Aerospace Industry: A Method to Assess Manufacturing and Assembly Aspects of Product Architectures

2019 ◽  
Vol 1 (1) ◽  
pp. 2961-2970 ◽  
Author(s):  
Francois Bouissiere ◽  
Claude Cuiller ◽  
Pierre-Eric Dereux ◽  
Corentin Malchair ◽  
Claudio Favi ◽  
...  
Keyword(s):  
Production Rate ◽  
Conceptual Design ◽  
Process Improvement ◽  
Design Tool ◽  
Test Case ◽  
Architecture Design ◽  
Passenger Transport ◽  
Conceptual Design Phase ◽  
Civil Aircraft ◽  
Preliminary Application

AbstractIn recent years, the air transport market has quickly grown, creating new civil aircrafts demand, challenging the actual production rate of aerospace industries. The bottleneck of the current civil aircrafts production rate lies in the capability of the manufacturing and assembly facilities in relation to the aircrafts architecture design.The aim of this work is to develop a methodology and a related mathematical model that can be used at the conceptual design phase for the assessment of criticalities related to the product assemblability. The methodology allows to recognize modules and/or interfaces which are mostly affecting the assembly time providing a design tool for the comparison and evaluation of product architecture alternatives.A preliminary application has been done on the nose-fuselage of a civil aircraft for passenger transport. The test case provides interesting outcome in the identification of modules and module interfaces which are strongly affecting the assembly phase and required a re-arrangement (new architecture design) for the process improvement.

A New Analytical Model of a Centrifugal Compressor and Validation by Experiments

2010 ◽  
Vol 26 (1) ◽  
pp. 37-45 ◽  
Author(s):  
H. Pourfarzaneh ◽  
A. Hajilouy-Benisi ◽  
M. Farshchi
Keyword(s):  
Conceptual Design ◽  
Centrifugal Compressor ◽  
Experimental Studies ◽  
Design Tool ◽  
Operating Conditions ◽  
Experimental Results ◽  
Design Phase ◽  
Robust Model ◽  
Conceptual Design Phase ◽  
Wide Range

AbstractIn the conceptual design phase of a turbocharger, where emphasis is mainly on parametric studies, before manufacturing and tests, a generalized and robust model that implies over a wide range properly, is unavoidable. The critical inputs such as compressor maps are not available during the conceptual design phase. Hence, generalized compressor models use alternate methods that work without any supplementary tests and can operate on wide range. One of the common and applicable modeling methods in design process is the ‘Dimensionless Modeling’ using the constant coefficient scaling (CCS). This method almost can predict the compressor characteristics at design point. However, at off design conditions, error goes up as mass flow and speed parameters increase. Therefore, the results are not reliable at these points. In this paper, a variable coefficient scaling (VCS) method is described. Then, a centrifugal compressor is modeled using the VCS method. To evaluate the model and compare it with the experimental results, some supplementary experiments are performed. Experimental studies are carried out on the compressor of a S2B model of the Schwitzer turbocharger in the turbocharger Lab., at Sharif University of Technology. The comparison between the experimental results and those obtained by the VCS method indicates a good agreement. It also suggests that the present model can be used as an effective design tool for all operating conditions.

A Research on the Body-in-White (BIW) Weight Reduction at the Conceptual Design Phase

2014 ◽  
Author(s):  
Bo Liu ◽  
Zhenfei Zhan ◽  
Xuemei Zhao ◽  
Haibo Chen ◽  
Bo Lu ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Weight Reduction ◽  
The Body ◽  
Design Phase ◽  
Conceptual Design Phase ◽  
Body In White

scholarly journals Developing a Conceptual Design Engineering Toolbox and its Tools

10.14311/532 ◽  
2004 ◽  
Vol 44 (2) ◽  
Author(s):  
R. W. Vroom ◽  
E. J. J. Van Breemen ◽  
W. F. Van der Vegte
Keyword(s):  
Conceptual Design ◽  
Early Stage ◽  
Design Tool ◽  
Design Engineering ◽  
Design Tools ◽  
Design Engineers ◽  
Sources Of Knowledge ◽  
Short Notice ◽  
Engineering Work ◽  
Knowledge Portal

In order to develop a successful product, a design engineer needs to pay attention to all relevant aspects of that product. Many tools are available, software, books, websites, and commercial services. To unlock these potentially useful sources of knowledge, we are developing C-DET, a toolbox for conceptual design engineering. The idea of C-DET is that designers are supported by a system that provides them with a knowledge portal on one hand, and a system to store their current work on the other. The knowledge portal is to help the designer to find the most appropriate sites, experts, tools etc. at a short notice. Such a toolbox offers opportunities to incorporate extra functionalities to support the design engineering work. One of these functionalities could be to help the designer to reach a balanced comprehension in his work. Furthermore C-DET enables researchers in the area of design engineering and design engineers themselves to find each other or their work earlier and more easily. Newly developed design tools that can be used by design engineers but have not yet been developed up to a commercial level could be linked to by C-DET. In this way these tools can be evaluated in an early stage by design engineers who would like to use them. This paper describes the first prototypes of C-DET, an example of the development of a design tool that enables designers to forecast the use process and an example of the future functionalities of C-DET such as balanced comprehension.

Conceptual Cost Estimation of Multistage Axial Compressor Modules

2019 ◽  
Author(s):  
Claudio Favi ◽  
Federico Campi ◽  
Marco Mandolini ◽  
Irene Martinelli ◽  
Michele Germani
Keyword(s):  
Conceptual Design ◽  
Cost Estimation ◽  
Gas Turbines ◽  
Axial Compressor ◽  
Cost Effective ◽  
Design Tool ◽  
Design Solution ◽  
Cost Models ◽  
Conceptual Design Phase ◽  
The Right

Abstract Development of product architectures is a fundamental task in the conceptual design of complex products such as axial compressor of gas turbines. The definition of cost-effective architectures results from the introduction of conceptual cost estimation models aiming at the assessment of economical performances of different modules. Conceptual cost estimation means the product cost assessment in conceptual design phase. These models vary based on the technical and geometrical features of the defined product modules as well as to the specific manufacturing processes. The paper aims to describe the approach for early design cost estimation of Axial Compressor modules. The approach includes the design workflow and the required steps to build product architectures driven by cost indicator. The main limitation overtaken by the adoption of the proposed approach is the needs of a design tool able to characterize cost-effective design solution and to guide designer in product definition with the right level of confidence. The axial compressor product has been analyzed to retrieve different architectures and a case study of a rotor disc module is presented to demonstrate the feasibility of the proposed approach in the development of conceptual cost models starting from preliminary design information.

Accuracy of Analytical Engine Weight Estimation During the Conceptual Design Phase

2010 ◽  
Author(s):  
Fabian Donus ◽  
Reinhold Schaber ◽  
Klaus-Juergen Schmidt ◽  
Stephan Staudacher
Keyword(s):  
Conceptual Design ◽  
Estimation Method ◽  
Design Tool ◽  
Parameter Study ◽  
Test Case ◽  
Design Phase ◽  
Weight Estimation ◽  
Geometric Models ◽  
Conceptual Design Phase ◽  
Engine Design

This paper addresses the quality of weight estimation that can be achieved in the early design phase and illustrates the significance of the results for conceptual engine design. A study was undertaken to determine the accuracy of weight estimation during the conceptual design phase. To this end, different engines were modeled using the preliminary design tool MOPEDS. The estimation method used to generate the results is based on geometric models for the considered component parts that have been calibrated as closely as possible to the existing geometries. Furthermore, the modeled part weights provided by MOPEDS have been compared to the real part weights to assess the uncertainty of the estimation method. The deviations are discussed to identify where an improvement of the method could be profitable with regard to a better overall estimation. It has been shown that for some hardware the estimation method is already very accurate, whereas some parts have geometric models that require improvement to realize an overall high quality. One of the calibrated engine models was used additionally as the basis for a parameter study to determine the accuracy of the part weight estimation method using MOPEDS in automatic design mode. The results showed that the deviation in the overall component mass for each test case was nearly constant during this study.

The Implement of Optimization Design of a Car Body Based on VCD-ICAE System

2012 ◽  
Vol 479-481 ◽  
pp. 2577-2581
Author(s):  
Wen Bin Hou ◽  
Zhen Jun Bi ◽  
Hong Zhe Zhang ◽  
Ping Hu
Keyword(s):  
The Body ◽  
Vehicle Body ◽  
Whole Body ◽  
Design Parameters ◽  
Concept Design ◽  
Multi Objective Optimization ◽  
Detailed Model ◽  
Car Body ◽  
Multi Objective ◽  
Body Concept

In order to get the optimistic structure property and design parameters of a car body, the system of vehicle body concept design (VCD-ICAE) was developed by us to make the body design in the conceptual phase in the paper. It can build parametric geometry modeling and FEM model of body-in-white (BIW) automatically, and the structural stiffness was calculated. Based on the former model, a multi-objective optimization of the total body was designed to afford the reasonable parameters for detailed model of BIW, which realized lightweight of the whole body and high stiffness. In the paper, the total theory and flowchart of vehicle body concept design were afforded. An example with real body’s data was shown to prove the validity of the multi-objective optimization module in VCD-ICAE system. Finally, the optimal design scheme of the body was provided.

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