排序方式: 共有9条查询结果,搜索用时 15 毫秒
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本文对直升机桨叶单片互换的原理进行了论述,对标准桨叶的确定原则以及实施方法进行了探讨,并结合直11型机标准桨叶选定工作的流程和结果,对所述方法进行了实例分析。 相似文献
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被动空中交通流量管理中的动态排序算法 总被引:18,自引:1,他引:17
空中交通流量管理包括战略管理和战术管理两个方面,如何对等待降落的航班重新排序,使得在等待队列 航班的地面等待和空中等待成本总和最小是进近区域流量战术管制的主要研究内容之一。本文对目的机场的飞机降落时间问题进行了系统地分析,并利用互换理论对问题进行了推导与建模,得出了被动空中交通一管理中的动态排序算法。该算法与目前国内外一般处法不同,计算时不直接使用机场的容量约束,而是利用与容量相磁的统计航班服务时 相似文献
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本文介绍肝脏CT片的彩色三维重建以及相应肝脏体积和表面积计算的一种方法。方法涉及CT片中肝脏组织分割、数据压缩、数据组织方式、图形变换、消隐和明暗处理。最后列出一个病人肝脏的三维显示图像以及体积计算值。 相似文献
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彩色图象光斑的识别及分割 总被引:3,自引:0,他引:3
由于存在光斑及CCD摄像机固有特性的限制,使得彩色图象的分割更为困难,通过研究二分光反射模型及光斑的成因,分析了CCD摄象机特性对图象的影响,提出了一种光斑检测和彩色图象的分割算法,较好地解决了光斑识别和彩色图象分割的问题。 相似文献
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《中国航空学报》2022,35(12):72-88
Particle Image Velocimetry (PIV) is a well-developed and contactless technique in experimental fluid mechanics, but the strong velocity gradient and streamline curvature near the wall substantially limits its accuracy improvement. This paper presents a data processing procedure combining conventional PIV and newly developed Mirror Interchange (MI) based Interface-PIV for the measurement of the boundary layer parameter development in the blade leading edge region. The synthetic particle images are used to analyze the measurement errors in the entire procedure. Overall, three types of errors, namely the errors caused by the Window Deformation Iterative Multigrid (WIDIM) algorithm, the discrete data interpolation and integration, and the wall offset uncertainty, comprise the main measurement error. Specifically, the errors due to the discrete data interpolation and integration and the WIDIM algorithm comprise the mean bias, which can be corrected through the error analysis method proposed in the present work. Meanwhile, the errors due to the WIDIM algorithm and the wall offset uncertainty contribute to the measurement uncertainty. Computational fluid dynamics-based synthetic particle flows were generated to verify the newly developed PIV data processing procedure and the corresponding error analysis method. Results showed that the data processing method could improve the accuracy of PIV measurements for boundary layer flows with high curvature and acceleration and even with significant flow separation bubbles. Finally, the data processing method is also applied in a PIV experiment to investigate the boundary layer flows around a compressor blade leading edge, and several credible boundary flow parameters were obtained. 相似文献
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