A Fundamental Study for Creating 3D CG Animation of an Assembly Work

Abstract

This paper presents a new mode of expressing a 3D assembly work for creating a 3D CG animation without judgment by human from minimal required information. In the field of manufacturing, there are favorable movements in the utilization of 3D CAD for 3D simulation to shorten lead time for product development and pre-production. But simulating an assembly work has troubles to need huge quantity of manually input data. This paper discusses what minimal necessary information for creating 3D CG animations of assembly works is, focusing on the features of assembly works. Furthermore, a new mode of expressing a 3D assembly work is proposed as "state/change transition diagrams" (SCTD), which express arbitrary scenes in an assembly work as "state" and describe a sequential assembly work with "state" and "change", and the outline of its stepwise generation algorithm is also described. SCTD can be converted to a 3D CG animation of an assembly work without judgment by human. This paper focuses on the creating 3D CG animation of assembly works which workers use only their both hands.

A Proposal for Generating Good Assembly Sequences by Tournament Tree

“…The terms "parent part" and "child part" are identified by the relative sizes of the objects, and the terms differ from their meanings in the PLM research field (Ishii et al, 1992). The sizes of the parts can be obtained by 3D-CAD as in the preceding studies (Shinoda et al, 2000(Shinoda et al, , 2001(Shinoda et al, , 2002(Shinoda et al, , 2004(Shinoda et al, , 2005a(Shinoda et al, , 2005bNiwa et al, 2009;Yamanaka et al, 2006;Tsuboi et al, 2006Tsuboi et al, , 2007. Table 1 shows the size of each part of the water valve.…”

“…Previously, a method of generating assembly sequences systematically using contact-related figures has been proposed (Shinoda et al, 2000(Shinoda et al, , 2001(Shinoda et al, , 2002(Shinoda et al, , 2004(Shinoda et al, , 2005a(Shinoda et al, , 2005bNiwa et al, 2009;Yamanaka et al, 2006;Tsuboi et al, 2006Tsuboi et al, , 2007. In the studies, all the feasible assembly sequences are first generated using contact-related figures and then evaluated.…”