A unified second order moment model of turbulent combustion is proposed.
提出了一种湍流燃烧统一二阶矩模型。
The proposed algorithm is based on second order moment, and the problem of low SNR is compensated by long time integral.
它基于接收信号的二阶统计量，并用长时积分以弥补信噪比低的问题。
Such as parameter estimation types of statistics distribution tests of distribution hypothesis methods of linear-second order moment, ect.
数理统计学原理主要包括：参数估计、统计分布类型、分布拟合检验； 工程结构可靠度理论主要介绍了一次二阶矩方法。
In the probabilistic aspect, the second order moment, i. e. covariance was used, which took the first order correlation between nodal powers into account.
概率方面，考虑到二阶协方差阵，计及了各节点注入功率的一阶相关性。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
A first order second moment formulation for systems fatigue reliability assessment of offshore structures is presented.
本文提出了海洋平台结构系统疲劳可靠性分析的一阶二次矩方法。
Through the push over analysis of two tall concrete buildings with different structure types the influence of second order effect on top drift and base overturning moment had been discussed in detail.
对两栋不同结构体系的高层混凝土建筑进行了推覆分析，详细讨论了二阶效应对结构顶点侧移和基底倾覆力矩的影响。
Based on reliability theory, the first order second moment method (JC method) is adopted to analyze and compute the fatigue reliability.
基于可靠度理论，本文采用一次二阶矩法(JC法)对疲劳裂纹扩展可靠性进行计算。
The advanced first order and second moment iterative method are employed for calculation on reliability index and failure probability.
采用改进的一次二阶矩法对腐蚀管道的可靠性指标和失效概率进行了分析和计算。
The parameters of the model are fuzzily processed and the fuzzy risk can be evaluated by using the modified first order second moment method.
通过对模型中的参数进行模糊化处理，用改进一次二阶矩法计算了地下水过量开采的模糊风险率。
On the basis of the advanced first order and second moment method, the partial derivatives of the failure probability to the distribution parameters of the process variables were formulated.
由求解失效概率的改进一次二阶矩法出发，给出了失效概率对中间变量分布参数偏导数的计算公式；
The first-order second-moment method is fundamental in structural reliability analysis, its accuracy depends upon the nonlinear extent of performance functions around checking point.
一次二阶矩方法是结构可靠度分析的基本方法．一次二阶矩方法的计算精度依赖于验算点附近功能函数的非线性程度。
Secondly, the procedure of tunnel lining based on First Order Second Moment(FOSM) and JC method is presented to calculate the reliability of tunnel lining.
根据提出的可靠度计算理论和方法，编制了基于一次二阶矩和JC法的可靠度计算程序。
It is also shown that the second-order moment method of the power density is applicable to the truncated beams and overcomes the divergence difficulty of the beam quality factor.
功率密度的二阶矩方法可用于截断光束，并克服了光束质量因子的发散困难。
The reliability of the fatigue crack growth life of single inclusion is analyzed by the advanced first order and second moment method.
采用改进一次二阶矩法分析单个夹杂裂纹扩展的可靠性。
Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.
一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。
The main conclusions obtained in this thesis are as follow:(1) Based on FOSM, Second-order second-moment method modifies the results of FOSM, and has better calculation accuracy.
本文的主要结论有：（1）二次二阶矩法是以一次二阶矩法为基础，并对一次二阶矩法的计算结果进行二次修正，在多数情况下有着更好的计算精度。
The present usually reliability analysis method for engineering structures are Monte Carlo Simulate (MCS), First-order Second-moment method (FOSM) and reliability Surface method (RSM).
现有基本的结构可靠度计算方法可分为一次二阶矩法、蒙特卡罗法和响应面法。
The bubble-liquid two-phase jets are simulated using a second-order moment two-phase turbulence model.
本文采用二阶矩两相湍流模型模拟了气泡-液体闭式多股射流。
Based on the generalized reliability index given by Ditlevsen and the first order second moment method, a simplifed calculating method on structural reliability is presented.
基于由Ditlevsen给出的广义可靠指标和一次二阶矩法，提出了一个简捷的结构可靠度计算方法。
The result obtained has been compared with the one obtained by first order second moment (FOSM) method expanded about mean value.
为此 ，用基于验算点处展开泰勒级数的哈桑———林德法计算了轴心压杆稳定可靠性的可靠性指标 ，并同均值一次二阶矩法作了比较 。
The mean-value-first-order-second-moment method and advanced first-order-second-moment method are used to analyze the aseismatic serviceability of water supply network.
借鉴结构可靠度分析方法，给出了供水管网抗震功能可靠度分析的一次二阶矩方法。
Second, a special 2-D the fourth-order time-average moment spectrum is defined to estimate frequency in zero mean multiplicative and additive noise.
定义了特殊的二维四阶时间平均多矩谱来估计信号频率。
Second, a special 2-D the fourth-order time-average moment spectrum is defined to estimate frequency in zero mean multiplicative and additive noise.
定义了特殊的二维四阶时间平均多矩谱来估计信号频率。
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