中英文翻译CAD.doc

攀枝花学院本科毕业设计(论文)
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院(系): 机电工程学院
专业: 机械设计制造及其自动化
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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 limit