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31.
An estimation of the value and orientation of the inclination of middle-scale structures in the solar wind plasma is obtained on the basis of time lags of simultaneous correlated measurements on three spacecraft: INTERBALL-1, IMP-8, and WIND. It is shown that middle-scale plasma structures, in the majority of cases, are not perpendicular to the Sun–Earth line, but inclined to it (presumably, in the ecliptic plane), on average, at an angle of approximately 63° (or 27° to the YSE axis). However, this inclination is significantly less than the inclination of the Parker spiral for the interplanetary magnetic field (45° at the Earth's orbit). 相似文献
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弹射座椅系统外高速流场的数值模拟 总被引：2，自引：0，他引：2
对绕弹射座椅系统的高速流场进行了数值模拟.控制方程为雷诺平均的Navier-Stokes方程,空间离散为Osher逆风格式和五步龙格库塔格式,湍流模拟采用了基于M-SST两方程紊流模型的DES方法,计算中采用了区域分裂的并行技术.对来流马赫数分别为0.6,1.2的流场进行了计算,计算结果表明该方法可以较好地模拟弹射座椅系统外的高速流场. 相似文献
33.
Riazantseva M. O. Dalin P. A. Zastenker G. N. Parhomov V. A. Eselevich V. G. Eselevich M. V. Richardson J. 《Cosmic Research》2003,41(4):371-381
The results of a detailed study of large (by 20% and more) and sharp (faster than ten minutes) changes of the ion flux in the solar wind are presented. The data are provided by regular measurements onboard the INTERBALL-1 satellite in the period 1996–1999. Using statistical analysis, we obtained the distribution of these changes in their absolute and relative strength. It is shown that, for a considerable proportion of the events, such sharp and large changes of the ion flux (density) take place under conditions of fairly constant values of the solar wind velocity and of both the magnitude and components of the interplanetary magnetic field. 相似文献
34.
数字电子气动式座舱压力控制系统模型及性能分析 总被引：2，自引：0，他引：2
在分析数字电子气动式座舱压力控制系统结构的基础上,建立了座舱及控制系统中执行机构各部件的数学模型.分析系统的传递函数得到了系统稳定所需的PID控制参数取值范围,通过对系统动态性能的仿真进一步确定PID各参数的关系.结果表明:为了满足数字电子气动式座舱压力变化速率和稳定性的要求,PID参数需满足一定的关系:在一定范围内,控制器的比例参数应大于微分参数,而微分参数应大于积分参数. 相似文献
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