排序方式: 共有46条查询结果,搜索用时 15 毫秒
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通过对医药中间体产品生产工艺的分析,设计基于昆仑通态MCGS组态软件和触摸屏控制的变频器生产监控系统.实际应用表明:该系统简化了控制装置,提高了控制系统的防护水平和可靠性. 相似文献
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微多孔表面能够强化沸腾传热,具有广阔的工业应用前景,采用选择性激光熔化(Selective laser melting,SLM)成形微多孔表面是一种新型微多孔表面制造方法。主要研究了在SLM过程中扫描间距和激光功率对316L不锈钢粉末成形微多孔表面结构的影响。结果表明:0.3~0.5 mm扫描间距成形的微多孔表面的孔隙为规则通孔,且孔内壁存在大量粉末粘结,可形成大量潜在汽化核心;采用180~240 W激光功率和0.2~0.5 mm扫描间距,可获得水力直径为78.9~410.5μm、孔隙率为11.6%~50.2%的微多孔表面。采用去离子水进行沸腾传热实验,240 W激光功率、0.5 mm扫描间距成形的微多孔表面的起始沸腾温度为104℃,临界热流密度为150 W/cm^2,具有明显的沸腾传热强化效果。 相似文献
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张池 《中国新技术新产品》2011,(4):354-354
我国自改革开放以来,农民集体所有的土地(以下简称集体土地)一直处于三大方面的威胁之下:政府动用征收权征收集体土地、村委会及其干部乱批乱占集体土地、村民个人乱占集体土地。究其根源在于我国现行集体土地管理制度的立法及其执法均存在问题,亟须解决。 相似文献
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张池 《武汉工业学院学报》2011,30(1)
针对传统PI调节器控制PMSM的缺点,基于Matlab/Simulink给出了采用模糊PI控制PMSM的完整设计方法.该方法采用模糊控制器在线整定PI调节器参数,同时对比例环节与积分环节进行自调整,使得PMSM在整个运行期间能够快速跟踪输出量.仿真结果表明,基于模糊PI控制的系统模型具有动态响应快、稳态精度高及抗干扰能力强等优点. 相似文献
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在造纸机中有许多传动点由两台电动机拖动,由于两台电动机的机械特性不同,在工作过程中的出力存在差异即输出转矩不同,从而造成一台电机出力不够,而另一台电机过载烧毁.因此,负荷分配是造纸机电机拖动控制设计时考虑的重要方面之一.在分析负荷不均衡产生原因的基础上,得出负荷分配的原理,设计出一种基于Profibus现场总线通信的以PLC为控制器、变频器为拖动的造纸机负荷分配系统.生产运行显示造纸机的负荷控制精度进一步提高. 相似文献
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It is well known that the process industry is an energy-intense and water-consuming industry and is the main source of industrial water consumption and energy in China. Energy integration and mass integration are important approaches to achieve energy saving and emission reduction in the process industry. Generally, the methods can be classified into two groups: conceptual design methods and mathematical programming methods. The former includes mainly graphical methods based on pinch technology that is operated easily. A feasible solution can be quickly obtained. Conceptual design methods are sequential in nature including targeting and design two steps. The latter is based on superstructure optimization and corresponding algorithm is adopted to solve the model. The trade-offs and connections among the entire network can be established and explored. Multiple factors can be considered and optimized simultaneously by mathematical programming methods. This paper describes the synthesis of heat integrated water allocation networks (HIWAN) based on both conceptual design methods and mathematical programming methods systematically. In addition, the characteristics and shortcomings of the existing research methods are summarized, and the future research direction is prospected. 相似文献