提高摄动外推精度的一种方法—改进初值法

根据人造地球卫星—阶摄动理论的计算方案,导出了利用实测轨道根数改进摄动计算初值的条件方程。利用改进后的初值进行摄动外推,其精度可明显提高。     

Polarization Separation by an Adaptive Filter

The technique of adaptive filtering as applied to the design of a frequency-reuse receiving antenna which can provide optimum isolation from signals of unwanted polarization.     

导弹及固体火箭的外防护材料

叙述了导弹火箭系统外绝热防护，抗核辐射并介绍了作为固体火箭发动机结构材料的增强纤维／树脂、等复合材料抗氧化途径。     

物体有限变形下的非平衡热力学分析

本文采用不可逆过程热力学的观点,将流体、弹-粘塑性物体的一般本构关系,在形式上统一地用非平衡热力学流和非平衡热力学力间的唯象关系表出。在一些特殊情况下对唯象关系进行了讨论,得到一些大家熟知的重要关系式。还就在非平衡热力学条件下的硬化系数矩障h_(αβ)和Drucker假设进行了分析,证明以形h_(αβ)相关联的硬化方程和晶体塑性本构关系,一般不能满足不可逆过程热力学对其式的限制。     

多台系统Weibull过程的Bayes统计推断方法

本文的目的是要给出多台系统Weibull过程的Bayes推断方法。获得了尺度参数、形状参数以及系统能达到的MTBF的Bayes点估计和区间估计。某些估计只涉及到一重数值积分。最后,用一个实例说明这些方法。     

Performance evaluation of track fusion with information matrixfilter

In a multisensor environment, each sensor detects multiple targets and creates corresponding tracks. Fusion of tracks from these, possibly dissimilar, sensors yields more accurate kinematic and attribute information regarding the target. Two methodologies have been employed for such purpose, which are: measurement fusion and state vector fusion. It is well known that the measurement fusion approach is optimal but computationally inefficient and the state vector fusion algorithms are more efficient but suboptimal, in general. This is so because the state vector estimates to be fused obtained from two sensors, are not conditionally independent in general due to the common process noise from the target being tracked. It is to be noted that there are three approaches to state vector fusion, which are: weighted covariance, information matrix, and pseudomeasurement. This research is restricted solely to performance evaluation of the information matrix form of state vector fusion. Closed-form analytical solution of steady state fused covariance has been derived as a measure of performance using this approach. Note that the results are derived under the assumptions that the two sensors are synchronized and no misassociation or merged measurement is considered in the study. Results are compared with those using Monte Carlo simulation, which was used in the past to predict fusion system performance by various authors. These results provide additional insight into the mechanism of track fusion and greatly simplify evaluation of fusion performance. In addition, availability of such a solution facilitates the trade-off studies for designing fusion systems under various operating conditions     

RELIABILITY ANALYSIS METHODFOR STRUCTURAL STIFFNESS

ＲＥＬＩＡＢＩＬＩＴＹＡＮＡＬＹＳＩＳＭＥＴＨＯＤＦＯＲＳＴＲＵＣＴＵＲＡＬＳＴＩＦＦＮＥＳＳＬｕＺｈｅｎｚｈｏｕ；ＦｅｎｇＹｕａｎｓｈｅｎｇ（Ｄｅｐｔ．ｏｆＡｉｒｃｒａｆｔＥｎｇｉｎｅｅｒｉｎｇ，ＮｏｒｔｈｗｅｓｔｅｒｎＰｏｌｙｔｅｃｈｎｉｃａｌＵ...     

无独立线路标准化电位差计的自检

无独立线路标准化电位差计按单个电阻进行元件检定不方便、时间长、过程复杂。采用ｊ＋１盘的１０／Σ１Ｕｉ＾ｊ＋１示值检定ｊ盘每个步进值的电压比较法，可缩短时间，方便易行。提高了检定精度，并推导出系列计算公式和应用实例。     

红宝石球轴承在低温条件下的静态热导

通过红宝石球轴承与不锈钢球轴承的实测热导比较，说明了在低温条件下红宝石球轴承的热导较高，热导受温度和负荷的影响较大，但是红宝石球轴承的接触热导较小。     

材料韧脆转移过程的数学模拟和实验标定

研究了Cr24Al2Si铁素体不锈钢韧脆转移过程的性能-温度曲线的数学模拟,找到了其最佳的韧脆转移数学模型。通过韧脆转移的数学模型,还可以找到能量韧脆转移温度T_C与无塑韧脆转移温度T_(NDT)之间的定量换算关系。 上述关系,不仅可以成为确定韧脆转移温度通用准则,提供一种定量分析的数学方法,而且使韧脆转移曲线转化为韧脆机制转移曲线,从而为建立冷脆断裂机制图奠定了基础。