畢業(yè)設(shè)計之多媒體工程數(shù)據(jù)庫管理系統(tǒng)-文庫吧資料
2025-07-05 13:59本頁面
【正文】 his arrangement can improve the systems working efficiency. GDB and LDB can be transferred each other as needed.The ECADEDBMS provides the integrated multimedia environment for the GD, PD, OSD subsystem and so on as shown in should meet the requirement as follows. Requirement for Integrated Management of Graphics and Engineering DataEvery CAD subsystem of ECAD needs many functions of graphics operation and management and the ability to access easily a vast amount of engineering data from GDB and LDB. A large number of engineering drawings and parameters of typical products must be entered into EDB and referenced frequently by engine designers. Sometimes some data should be extracted from graphics and transferred to GDB or LDB. The ECADEDBMS is the foundation for all CAD subsystems. Requirement for ImagesWhen using standard parts Lib. And material Lib. the designer can do two things. The first is to retrieve parameters of desired part and transfer them to corresponding graphics generation program (2D or 3D) to form the part graphics on the designed draw. The second is to look up technical text about desired part, for example the technical index, processing explanation [2], drawing of mechanical parts contain a vast amount Chinese characters and graphics. To enter these materials is very difficult. There are three kinds of technical materials about standard parts and the engine as following.(1)The parameter tables should be entered into GDB and can be retrieved and transferred to graphics generation programs by designers. EDBMS must create and manage SPPL for this kind of parameter tables of manuals.(2)The materials of technical index and processing explanations and drawings can be simple put into TRMSIL in the page form using the scanner. Designer can use EDBMS to look up these image files page by page. The scanned images are pressed to save disk space.(3)The product photographs of the whole engine or assembly parts can be scanned with scanners or shooted into puters with pick up cameras in the pressed files. Designers can look up these image files when making decision of selecting solid model. Requirements for SoundSome sound records of evaluating meetings and speaks of specialists and statements of design experience and product introduction audio tapes can also be input to puter disk. So designers can replay these audio files for reference. Requirements for videoSome video files are needed to be stored in puter disks. These files record the running saturation of internal or external engines or assembly parts and the vehicle equipped with the engines on different roads and sloping fields. Requirements for AnimationsThe general design of the engine needs the layout of assembly parts and various of the layout from different view point. Designers have the demand for motion animation of movement system [3].2 IMPLEMENTATIONSome problems mentioned above ha
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