EFFECT OF THE RIBLETS SURFACE ON THE BOUNDARY LAYER DEVELOPMENT

ＥＦＦＥＣＴ　ＯＦ　ＴＨＥ　ＲＩＢＬＥＴＳ　ＳＵＲＦＡＣＥ　ＯＮ　ＴＨＥ　ＢＯＵＮＤＡＲＹ　ＬＡＹＥＲ　ＤＥＶＥＬＯＰＭＥＮＴＷａｎｇＪｉｎｊｕｎ；ＬａｎＳｈｉｌｏｎｇ；ＬｉａｎＱｉｘｉａｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＦｌｕｉｄＭｅｃｈａｎｉｃｓＩＢｅ...     

复杂系统的可靠性分析方法研究

本文对未来的运载器的复杂控制系统的可靠性建模、分配和预计的一般方法和程序及综合分析方法进行了讨论和研究。并简述了复杂系统的计算机辅助可靠性分析。     

门限自回归模型参数的局部正交设计寻优法

在采用点值图确定门限区间个数的基础上，对门自回归模型中门限值、滞后步长、各门限区间模型阶数，利用正交设计方法寻优，计算工作量锐减，却可得到精度较高的预报模型。     

基于Pro/E软件的卫星三维建模方法的探讨

主要对基于Pro/E软件的卫星三维建模和高效率、高可靠性、低成本的总装设计方法等进行了初步的研究和探讨。     

层板孔隙结构中两个任意尺寸半球形珠状发汗的蒸发与燃烧速率分析

针对微重力条件下层板孔隙结构中两个相邻任意尺寸半球形珠状发汗的蒸发与燃烧过程,建立了相应的数学物理模型;在双球坐标系中求解分子扩散传质偏微分方程,得到发汗液珠的分子扩散组分分布的解析解和扩散速率表达式;分析得到在常温、高温条件下蒸发以及燃烧状态下发汗液珠的相互作用因子式,计算了相互作用的发汗液珠在不同条件下的发汗蒸发量以及变化趋势.     

Ionospheric behavior of the F2 peak parameters foF2 and hmF2 at Hainan and comparisons with IRI model predictions

Monthly median values of foF2, hmF2 and M(3000)F2 parameters, with hourly time interval resolution for the diurnal variation, obtained with DPS-4 digisonde observations at Hainan (19.4°N, 109.0°E) are used to study the low latitude ionospheric variation behavior. The observational results are compared with the International Reference Ionospheric Model (IRI) predictions. The time period coverage of the data used for the present study is from March 2002 to February 2005. Our present study showed that: (1) In general, IRI predictions using CCIR and URSI coefficients follow well the diurnal and seasonal variation patterns of the experimental values of foF2. However, CCIR foF2 and URSI foF2 IRI predictions systematically underestimate the observed results during most time period of the day, with the percentage difference ΔfoF2 (%) values changing between about −5% and −25%, whereas for a few hours around pre-sunrise, the IRI predictions generally overestimate the observational ones with ΔfoF2 (%) sometimes reaching as large as ∼30%. The agreement between the IRI results and the observational ones is better for the year 2002 than for the other years. The best agreement between the IRI results and the observational ones is obtained in summer when using URSI coefficients, with the seasonal average values of ΔfoF2 (%) being within the limits of ±10%. (2) In general, the IRI predicted hmF2 values using CCIR M(3000)F2 option shows a poor agreement with the observational results. However, when using the measured M(3000)F2 as input, the diurnal variation pattern of hmF2 given by IRI2001 has a much better agreement with the observational one with the detailed fine structures including the pre-sunrise and post-sunset peaks reproduced reasonably well. The agreement between the IRI predicted hmF2 values using CCIR M(30,000)F2 option and the observational ones is worst for the afternoon to post-midnight hours for the high solar activity year 2002. During daytime hours the agreement between the hmF2 values obtained with CCIR M(30,000)F2 option and the observational ones is best for summer season. The discrepancy between the observational hmF2 and that obtained with CCIR M(30,000)F2 option stem from the CCIR M(3000)F2 model, which does not produce the small scale structures observed in the measured M(3000)F2.     

空投鱼雷蛇形搜索攻击有利提前角模型研究

提出了一种用等效扇面方法对蛇形搜索航行鱼雷攻击有利提前角的解算方法,并通过仿真对模型进行了修正。仿真结果表明,经修正后的鱼雷可达到最大命中概率。     

利用微气囊扰动进行流动控制的数值模拟研究

探讨一种可以用来模拟“三角翼上分布微气囊，从而控制流动获得滚转力矩”的数值方法。为微型飞机的气动设计提供一种工具。研究的内容包括：考虑微气囊的三角翼网格生成、流场NS方程计算、微气囊不同布局对流动的扰动等。     

Digital Aircraft Sheet Metal Part Manufacturing System and Its Key Technology

The architecture of digital sheet metal manufacturing system is proposed based on the classification of sheet metal manufacturing information.The essence of digital manufacturing is the definition,management and transfer of information,and the key technologies are brought forward and described.It is pointed out that knowledge-based manufacturing elements design is necessary to make digital technology efficient.The management of all kinds of sheet metal manufacturing element information is to build single source of manufacturing data.Multi-state model-based digital transfer and coordination method is designed to provide a foundation for digital manufacturing of aircraft sheet metal part.The application of digital sheet metal manufacturing is exemplified with an aircraft sheet metal part.The application result is compared to that of the traditional analog transfer technology.It is shown that the developed technology can improve part quality,shorten manufacturing time and lower manufacturing cost.     

工业远程监控系统实施新方案

近期远程监控系统在工业中逐步推广,针对工业系统的特点和工业网络的实际情况,在原有工业系统的基础上,增加现场设备区域的图像监控和数据传输功能,提出了一种工业远程监控系统实施方案。本文论述了该系统的结构、原理及实现方法,经具体实施证明,本文提出的方案已基本能够满足一个通用的基于公用网络的远程视频监控系统的要求,体现了较重要的理论价值和很强的工程实用价值。