关于计算机CAD的毕业设计外文翻译——中英文翻译、文献翻译.doc

原文:
HARDWARE
Computers
There are two major types of hardware used in a CAD system. Computer and input/output (I/O) devices. In the early days of CAD. mercial CAD systems used puters. Today, nearly all CAD software runs on a general-puter.
Depending on plexity of the CAD package, it may require a puter, a puter, or simply a puter. In general, the more functionalities a CAD system provides, the more powerful puter needed. Three dimensional solid modelers require much puting than do two-dimensional drafting systems; thus, they need more puters. Systems that integrate engineering analysis or simulation packages generally are putation-intensive. A puter not only speeds up the response of a CAD system, but also can support multiple users without significant performance degradation.
Several other parameters ponents concerning puter also have to be considered.
CAD HARDWARE
random-access memory (RAM)capacity
permanent disk-storage capacity
special graphics accelerator
tape backups
RAM is the actual physical memory (vs. virtual memory)of puter. A small memory capacity means slow processing due to frequent swapping between the physical memory and the virtual memory on disk. Because CAD is extremely storage demanding, disk capacity is important. Small disk capacity limits the system to the storage of only a few drawings. CAD is graphics-based and requires tremendo