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391.
G.L. Huang 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(8):1191-1194
Coronal magnetic field and nonthermal electrons are very important parameters for understanding of the global heliophysical processes. A flare on November 1, 2004 is selected for self-consistent calculations of coronal magnetic field parallel and perpendicular to the line-of-sight, and density of nonthermal electrons from Nobeyama observations. Both of the diagnosis methods and results are discussed in this paper. 相似文献
392.
393.
斯德谊 《北京航空航天大学学报》1996,22(2):141-145
声光相关技术在检测宽带微弱信号中有很大的潜力,提出在射频上用声光相关器对扩频信号做相关运算的方案,给出扩频信号的快速捕获、精密跟踪和信息解调的方法,并设计了实验系统,结果得到了验证。 相似文献
394.
阐述了调频连续波无线电高度表工作原理和仿真模型,在分析中考虑了垂直速度形成的多普勒效应,文中给出几种仿真计算的结果,分析计算结果可得知高度表的工作稳定性以及多普勒效应引起的动态误差,仿真计算程序可以应用于优化伺服系统参量或制作高度表的数学仿真器等方面。 相似文献
395.
分析了周边固定的橡胶薄膜受气压作用的轴对称问题,推导了基本方程,并得到了数值解,给出了薄膜的应力分布和形变特征。结果表明在大变形情况下,橡胶薄膜处于单向拉伸状态。 相似文献
396.
397.
薛晓春 《北京航空航天大学学报》1998,24(5):549-551
采用矢通量分裂法在网格加密后对电磁散射场和雷达散射截面积RCS进行了检验.根据矢通量分裂法将特征值分解为正负两部分,每一部分抑制了各自的误差.目前计算RCS大都采用频域方法,运用时域方法在实际网格下进行差分运算还较少见.计算结果与网格加密前的情况基本一致. 相似文献
398.
Zhen Yang Ya-Zhong Luo Jin Zhang 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
A relative dynamics equation-set based on orbital element differences with J2 effects is derived, based on which a two-level approach is proposed to optimize the Mars orbital rendezvous phasing with a large difference in the initial ascending node. The up-level problem uses the revolution deviation between the target spacecraft and the chaser as the design variable, and employs a linear search to find the optimum. The low-level problem uses the maneuver revolutions, locations, and impulses as the design variables, and is solved using a hybrid genetic algorithm combined with sequential quadratic programming. To improve the solution accuracy, an iteration method is developed to satisfy the terminal constraints of the absolute numerical integration trajectory. Test cases involving Mars sample return missions with large initial node differences are presented, which show that the relative dynamics, two-level optimization model, and hybrid optimization algorithm are efficient and robust. Compared with previously published results, the total velocity increment has been further reduced by utilizing this proposed approach. It is found that a five-impulse plan requires the least quantity of propellant, and a propellant-optimal minimum rendezvous duration exists for this long-duration, large non-coplanar rendezvous problem. 相似文献
399.
400.
Leonardo D. Chiwiacowsky Paolo Gasbarri Haroldo F. de Campos Velho 《Acta Astronautica》2008,62(10-11):592-604
The present investigation is focused on the solution of a dynamic inverse problem which is concerned with the assessment of damage in large space structures by means of measured vibration data. This inverse problem has been presented as an optimization problem and has been solved through the use of the conjugate gradient method with the adjoint equation, also called the variational approach. When a high number of damaged elements has to be found and these elements are also severely damaged, it is shown that the use of an additional method is necessary in order to provide a better initial guess for the conjugate gradient method. A stochastic method, represented by the genetic algorithm method, has been chosen because it provides robust search in complex spaces and also reduces the chance of converging to local optima. The application of this hybrid approach showed that better results can be achieved, although the computational time for the application analyzed here could increase. The damage estimation has been evaluated using noiseless and noisy synthetic experimental data, and the reported results are concerned with a space truss structure. 相似文献