联合生产存储问题的模拟退火算法

对确定性需求的联合补充生产存储控制系统进行分析，得出其关键问题是确定系统的联合生产补充周期和各产品的生产补充周期。建立了相应的模型，提出一个模拟退火算法，通过算例表明该算法可得出较优的可行解，与其他算法比较可以更有效地解决此类问题。     

基于GL Studio的航空仪表ActiveX控件的设计

利用GL Studio软件,结合VC++6.0混合编程,设计了四大航空仪表的ActiveX控件。介绍了GL Studio软件及ActiveX控件的功能及特点。详细介绍了高度表、空速表、磁罗盘、领航时钟的设计过程。最后结合某型歼击机模拟仿真平台,验证了航空仪表ACTIVEX控件运行的可行性。     

Experimental Analysis on the Variable Polarity Plasma Arc Pressure

Arc pressure is one of the key factors for variable polarity plasma arc(VPPA) and welding pool formation. In this paper, VPPA pressure is measured by pressure transducer and U-tube barometer methods, and advantages and disadvantages of the two methods are compared. The effects of welding parameters, including with straight polarity(SP) current, reverse polarity(RP) current, time ratio of SP to RP, plasma gas flow rate, on VPPA pressure are investigated by using an orthogonal design. The experimental results indicate that the influencing degree of the welding parameters are in the order of plasma gas flow rate, SP current, time ratio of SP to RP, RP current. These results are important to researches of VPPA welding process and its mechanism. The physics behavior of VPPA is taken into account when the above influence mechanisms are analyzed. Firstly, according to the mechanism of the cooling compression to the arc, the compression to VPPA is enhanced with the increase of plasma gas flow, so the VPPA pressure would increase obviously. Secondly, although the temperature of VPPA is as a function of the welding current, the radius of VPPA is also enhanced. So the effects of SP current on VPPA pressure are inferior to the effects of plasma gas flow. Thirdly, VPPA pressure increases as a function of time ratio of SP to RP because the frequency of welding current influences the arc pressure to the some degree; Finally, the RP intervals are farther less than the SP intervals, so the influence to the pressure is minimal.