A Sensitivity Approach for Eliminating Clashes from Computer Aided Design Model Assemblies

Mohammad Shaheer Zubairi, Trevor Robinson, Cecil Armstrong, Danielle Soban

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Clashes occur when components in an assembly unintentionally violate others. If clashes are not identified and designed out before manufacture, product function will be reduced or substantial cost will be incurred in rework. This paper introduces a novel approach for eliminating clashes by identifying which parameters defining the part features in a computer aided design (CAD) assembly need to change and by how much. Sensitivities are calculated for each parameter defining the part and the assembly as the change in clash volume due to a change in each parameter value. These sensitivities give an indication of important parameters and are used to predict the optimum combination of changes in each parameter to eliminate the clash. Consideration is given to the fact that it is sometimes preferable to modify some components in an assembly rather than others and that some components in an assembly cannot be modified as the designer does not have control over their shape. Successful elimination of clashes has been demonstrated in a number of example assemblies.
Original languageEnglish
Article numberJCISE-13-1184
Number of pages9
JournalJournal of Computing and Information Science in Engineering
Issue number3
Early online date28 Apr 2014
Publication statusPublished - 1 Sept 2014
Externally publishedYes

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  • clash detection
  • assemblies
  • parametric design
  • rework
  • CAD


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