No abstract

Specific rendering modes are developed for a combined visual/haptic interface to allow exploration and understanding of fluid dynamics data. The focus is on visualization of shock surfaces and vortex cores. Advantages provided by augmenting traditional graphical rendering modes with haptic rendering modes are discussed. Particular emphasis is placed on synergistic combinations of visual and haptic modes which enable rapid, exploratory interaction with the data. Implementation issues are also discussed.

In this paper, we report on continuing research on the organization and functionalities of a certain type of computer-implemented associative memory. The associative memory in question is being created to serve as part of a feature-based design system, at present to be used primarily in suDwrt o f the design, fabrication planning, or inspection planning of discrete mechanical machine parts.This present effort is consonant with prior related work in the realm of case-based reasoning, especially as related to the role of memory in design. Our associative memory innovations are in the use of fuzzy sets and neural net computing in the representation, storage and retrieval of design, fabrication, inspection and materials knowledge.We have designed and implemented a considerable portion of the associative memory and have demonstrated retrieval of previous designs on the basis of qualitative geometry. We have also demonstrated ability to explore materials composition with the objective of meeting critical materials properties constraints. Acknowle&ement

The time-optimal control of flexible structures with d a m p ing is considered. We formulate the general time-optimal control problem for single-axis flexible structures, and an analytical result is given for a lower bound on the number of control switches for the one-bending-mode case. Numerical solutions and simulations are presented to show several interesting trends of the time-optimal control switch times as the frequencies and dampings of the flexible modes are varied.

No abstract