The paper introduces the architecture of conceptual assembly expert system, which makes fuzzy and qualitative presentation of design knowledge in the conceptual assembly design stage. Qualitative simulation approach in the expert system is a new approach to designing assemblies' tolerance design and joint configuration in the conceptual design. Also, qualitative analysis assists designers to determine feasible assembly sequences. The system creates a rough draft of a set of promising design solutions that would be analyzed in more detail in the later design stages.

This paper investigates new wavelet-based multiresolution modeling techniques in CAD. MRA techniques are extended to detail feature transplanting and detail feature copying from previous MRA editing including sweep editing, fractional editing, synthesis editing and detail blending. Two new editing methods called detail feature transplanting and detail feature copying are added to previous sweep editing, fractional editing, synthesis editing and detail blending. Detail feature transplanting editing is a way to transplant detail features of a curve/surface to another curve/surface. Detail feature copying editing is a way to copy or move detail features on the same curve/surface.