ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Dynamic analysis of many mechanical systems is often involved with contacts amongbodies. This paper presents an efficient and general-purpose contact search algorithm for multibodydynamics in the context of the compliance contact force model. While many conventional collisiondetection algorithms are based on the absolute coordinate system, this paper proposes to use therelative coordinate system in detecting a contact. A boundary box of a defense surface geometry isdivided into many blocks. A contact reference frame is defined on the defense body of a contactpair. Since all geometric variables necessary to detect a contact are measured relative to the contactreference frame attached to the defense body, the variables belonging to the defense body areconstant, which significantly reduces computation time associated with the contact search.Therefore, the contact reference frame plays a key role in developing an efficient contact searchalgorithm. Contour of the defense body is approximated by many piecewise triangular patches,while contour of the hitting body is represented by hitting nodes along its boundary. Boundingboxes inside which contain each body of a contact pair are defined at a preprocessing stage toeliminate an exhaustive contact inspection when two bodies are in a distance. If two boundingboxes are turned out to be in a contact during the pre-search, each node on the hitting boundary isinspected to find out to which block the node belongs in the post-search. Since each block dividingthe boundary of the defense body has a list of patches, each node on the hitting boundary is testedfor a contact only with the patches in the block that the node belongs. Actual contact calculation isthen carried out to find the contact penetration used in calculating the compliant contact force.Numerical example is performed to demonstrate the validity of the proposed method
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.120.129.pdf
