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Multidisciplinary Design Optimization of Modular Industrial Robots by Utilizing High Level CAD templates
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
2012 (English)In: Journal of mechanical design (1990), ISSN 1050-0472, E-ISSN 1528-9001, Vol. 134, no 12Article in journal (Refereed) Published
Abstract [en]

This paper presents a multidisciplinary design optimization (MDO) framework for automated design of a modular industrial robot. The developed design framework seamlessly integrates High Level CAD templates (HLCt) and physics based high fidelity models for automated geometry manipulation, dynamic simulation, and structural strengthanalysis. In the developed framework, methods such as surrogate models and multilevel optimization are employed in order to speed up the design optimization process. This work demonstrates how a parametric geometric model, based on the concept of HLCt, enables a multidisciplinary framework for multi-objective optimization of a modular industrial robot, which constitutes an example of a complex heterogeneous system.

Place, publisher, year, edition, pages
American Society of Mechanic , 2012. Vol. 134, no 12
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-81878DOI: 10.1115/1.4007697OAI: oai:DiVA.org:liu-81878DiVA: diva2:556186
Note

On the day of the defence day the status of this article was: Manuscript

Available from: 2012-09-24 Created: 2012-09-24 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Design Automation for Multidisciplinary Optimization: A High Level CAD Template Approach
Open this publication in new window or tab >>Design Automation for Multidisciplinary Optimization: A High Level CAD Template Approach
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the design of complex engineering products it is essential to handle cross-couplings and synergies between subsystems. An emerging technique, which has the potential to considerably improve the design process, is multidisciplinary design optimization (MDO).

MDO requires a concurrent and parametric design framework. Powerful tools in the quest for such frameworks are design automation (DA) and knowledge based engineering (KBE). The knowledge required is captured and stored as rules and facts to finally be triggered upon request. A crucial challenge is how and what type of knowledge should be stored in order to realize generic DA frameworks.

In the endeavor to address the mentioned challenges, this thesis proposes High Level CAD templates (HLCts) for geometry manipulation and High Level Analysis templates (HLAts) for concept evaluations. The proposed methods facilitate modular concept generation and evaluation, where the modules are first assembled and then evaluated automatically. The basics can be compared to parametric LEGO® blocks containing a set of design and analysis parameters. These are produced and stored in databases, giving engineers or a computer agent the possibility to first select and place out the blocks and then modify the shape of the concept parametrically, to finally analyze it. The depicted methods are based on physic-based models, meaning less design space restrictions compared to empirical models.

A consequence of physic-based models is more time-consuming evaluations, reducing the probability of effective implementation in an iterative intensive MDO. To reduce the evaluation time, metamodels are used for faster approximations. Their implementation, however, is not without complications. Acquiring accurate metamodels requires a non-negligible investment in terms of design space samplings. The challenge is to keep the required sampling level as low as possible.

It will be further elaborated that many automated concurrent engineering platforms have failed because of incorrect balance between automation and manual operations. Hence, it is necessary to find an equilibrium that maximizes the efficiency of DA and MDO.

To verify the validity of the presented methods, three application examples are presented and evaluated. These are derived from industry and serve as test cases for the proposed methods.

Abstract [sv]

Vid utvecklingen av komplexa och tätt integrerade maskintekniska produkter är det viktigt att hantera gränsöverskridande kopplingar och synergier mellan olika delsystem. En ny teknik, som har potential att drastiskt förbättra konstruktionsprocessen, är multidisciplinär design optimering (MDO).

En MDO process kräver ett integrerat och parametrisk konstruktionsramverk. I detta syfte är design automation (DA) och knowledge based engineering (KBE) lovande tekniker för att stödja parametriska konstruktionsramverk. En avgörande utmaning ligger i hur och vilken typ av kunskap som bör förvaras för att förverkliga en generell DA ramverk.

Därför föreslås high level CAD template (HLCT) för geometri manipulation och high level Analysis template (HLAt) för koncept utvärderingar. Detta gör att användaren kan bygga modeller i mindre moduler som sedan monteras och utvärderas automatiskt. Grunderna kan jämföras med parametriska LEGO ® block som innehåller en uppsättning av design och analys parametrar. Dessa produceras och lagras i databaser, vilket ger ingenjörer eller en datoragent möjligheten att först välja och placera ut blocken och sedan ändra formen på dem parametriskt, för att slutligen analysera produkten. Metoderna är baserade på fysikbaserade modeller, vilket innebär mindre begränsningar jämfört med empiriska modeller.

Nackdelen med fysikbaserade modeller är tidskrävande utvärderingar, vilket gör genomförandet av dem i en iterativintensiv MDO opraktisk. För att minska utvärderingstiden införs metamodeller för snabbare approximationer. Att implementera metamodeller är dock inte utan komplikationer. Metamodeller kräver en icke försumbar investering i form av utvärderingar av fysikbaserade modeller för att nå en acceptabel approximation. Utmaningen är att hålla nivån på antalet iterationer så låg som möjligt.

Det kommer att redogöras att många samtidiga DA plattformar har misslyckats på grund av felaktig uppskattning gällande balansen mellan manuella och automatiserade operationer. Det är ytterst nödvändigt att hitta rätt balans för att maximera effektiviteten av DA och MDO.

För att verifiera giltigheten av de presenterade metoderna används tre applikationsexempel från industrin.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2012. 100 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1479
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-81880 (URN)978-91-7519-790-6 (ISBN)
Public defence
2012-10-19, ACAS, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-09-24 Created: 2012-09-24 Last updated: 2012-09-26Bibliographically approved
2. Efficient Optimization of Complex Products: A Simulation and Surrogate Model Based Approach
Open this publication in new window or tab >>Efficient Optimization of Complex Products: A Simulation and Surrogate Model Based Approach
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates how to use optimization efficiently when complex products are developed. Modelling and simulation are necessary to enable optimization of products, but here it is assumed that verified and validated models of the products and their subsystems are available for the optimization. The focus is instead on how to use the models properly for optimization.

Knowledge about several areas is needed to enable optimization of a wide range of products. A few methods from each area are investigated and compared. Some modifications to existing methods and new methods are also proposed and compared to the previous methods.

These areas include

  • Optimization algorithms to ensure that a suitable algorithm is used to solve the problem
  • Multi-Objective Optimization for products with conflicting objectives
  • Multi-Disciplinary Optimization when analyses from several models and/or disciplines are needed
  • Surrogate Models to enable optimization of computationally expensive models

Modern frameworks for optimization of complex products often include more than one of these areas and this is exemplified with the industrial applications that are presented in this thesis, including the design and optimization of industrial robots and aircraft systems.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 88 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1655
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-115939 (URN)10.3384/diss.diva-115939 (DOI)978-91-7519-083-9 (ISBN)
Public defence
2015-04-24, ACAS, A-huset, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, Crescendo no. 234244VINNOVA, IMPOz no. 2013-03758
Available from: 2015-03-24 Created: 2015-03-24 Last updated: 2015-04-17Bibliographically approved

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