排序方式: 共有35条查询结果,搜索用时 15 毫秒
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介绍了基于USB接口芯片SL811HS和ARM微处理器LPC2214的嵌入式USB主机的设计,并给出了USB主机系统的软件设计结构. 相似文献
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Adaptive Type-2 fuzzy control possesses control performance better than the traditional adaptive fuzzy control.However,heavy computation burden obviously blocks the utilization of adaptive Type-2 fuzzy control in industrial application.By adopting novel piecewise fuzzy sets and center-average type-reduction,a simplified adaptive interval Type-2 fuzzy controller involving less computation is developed for practical industrial application.In the proposed controller,the inputs are divided into several subintervals and then two piecewise fuzzy sets are used for each subinterval.With the manner of piecewise fuzzy sets and a novel fuzzy rules inference engine,only part of fuzzy rules are simultaneously activated in one control loop,which exponentially decreases the computation and makes the controller appropriate in industrial application.The simulation and experimental study,involving the popular magnetic levitation platform,shows the predicted system with theoretical stability and good tracking performance.The analysis indicates that there is far less computation of the proposed controller than the traditional adaptive interval Type-2 fuzzy controller,especially when the number of fuzzy rules and fuzzy sets is large,and the controller still maintains good control performance as the traditional one. 相似文献
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采用射频磁控溅射方法,利用微细加工工艺制备了不同薄膜宽度的三明治结构FeCuNbCrSiB/Cu/FeCuNbCrSiB多层膜,在频率1~40MHz下研究了薄膜宽度对多层膜的纵向和横向巨磁阻抗效应的影响。结果表明,三明治结构多层膜的巨磁阻抗效应随薄膜宽度的变化具有显著的影响,当FeCuNbCrSiB层、Cu层宽度分别取1.6rflrn、O.8rflrn时,GMI%达到最大值一21.22645%。 相似文献
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撞壁雾化是现代直喷式中小缸径发动机中普遍存在的现象,研究撞壁雾化的特性对改善发动机的燃烧具有重要的意义。根据Mundo等人提出的飞溅喷雾撞壁模型,对定容室中的汽油喷雾撞壁现象进行了模拟计算与分析。通过改变壁面温度、壁面粗糙度、喷雾速度及网格数,对比分析了不同条件下喷雾撞壁过程发生的变化,为进一步进行喷雾撞壁试验、完善喷雾撞壁模型提供了参考。 相似文献
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叙述了煤矿采矿作业时常出现的一些事故,针对这些事故进行了分析并提出了一系列可靠措施,希望促进煤矿业安全性的提高,从而促进社会主义和谐社会的建设. 相似文献
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煤层气是一种清洁能源,有很大的利用价值,尤其是在当前国际国内经济高速发展,能源日渐短缺,环境压力和煤矿安全生产的严峻形势下,煤层气有效的合理开采工作显得更加急迫与重要。本文就我国煤层气的开采现状和开采前景作了详细介绍。 相似文献