Laboratory of Information Processing Science 17.1.1996

Tik-86.145 Product Models

Please write the following on each sheet:

- Tik-86.145 Product Models

- 17.1.1996

- last name, first name

- faculty

- student id.

Reply to at most four questions of the following:

(1) Describe briefly the concepts of so-called representation schemes. Which desirable properties of geometric modelling methods can be defined in terms of representation schemes?

(2) (a) What are the reasons for choosing parametric representations of curves and surfaces in CAD, instead of non-parametric representations?

(b) Parametric cubic curves:

(a) have ______________ degrees of freedom

(b) use ______________ degree polynomial

(c) exhibit ______________ continuity.

(3) Describe briefly the main concepts of feature-based modelling. Also describe the basics of some feature taxonomy as described in the course material. On which basis can features be grouped in taxonomic groups?

(4) Describe briefly the main tasks and objectives of assembly models. What are the prime approaches to assembly modelling? How can features be applied to assembly modelling?

(5) Describe briefly the modeling of production processes in a feature based process planning system. What types of process information should the planning system have available? What requirements and problems are issued to feature representations in such a system?