| Fan blower is an often-used equipment in mechanical industry, which is widely applied in aviation, shipbuilding, mobile and power plant etc. And it plays a very important role in production industry.It's well known that fan blade is the key part for a fan blower to realize air transmission. The fan blower design emphasizes on construction of the fan blade structure. Now, in fan blade construction research area, realizing fan blade surface design by applying computer gains recognition. Therefore, there is a good market forecasting for developing blower fan blade CAD software in middle and small enterprises.Actually, there are some surface construction CAD software in market, but there are few software aiming at fan blade's characteristic, and there are some CAD software with no high intelligent and integration, which have no good construction effect, even can't insure fan blower's aerodynamic performance. Thus, developing a set of all-purpose blower fan blade CAD system is imperative. On the base of the traditional fan blower designing method, the essay makes a thorough research on technical details of the blower CAD. And above the basic theory, a soft ware Fan/S CAD 1.0 is developed, which can basically meet many kinds of fan blade's designing demand.The essay introduces the Fan/S CAD's software, which initially introduces the research's target and significance, and shows CAD's system structure; aiming at structure's data precision, it discusses NURBS modeling method in technical details, analyzes different fan blade's surface structure character and the programming design method during construction; the essay specifically describes the fan blade's three-dimensional display, which OPENGL romance performance display technology is described one by one; data base technology is also an illustrative key, that how to realize fan blade data's collecting and saving, and how to manage client restriction are concretely discussed in the essay; the essay introduces the fan blade's developingarithmetic for the processing of the fan blade, and it also introduces how the CAD system display the developing figure; the essay finally introduces the designing principle of the software interface and show the final result of the interface design.Fan/S CAD system uses Visual C++ 6.0 as developing tool, comprehensively applies many kinds of application technology, and realizes the successful integration of the blower fan blade design and computer. Most of the system performance modules are basing on basic developing, with independent intellective property. Its application replenishes the empty of the market, is an effective tool to enhance fan blower designing quality, and will certainly bring enterprises a considerable economic benefit. |
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