Taking into account of the structure distortion , the theory and method of load calculation is researched from the perspective of engineering and airworthiness in this paper . the presented theory and method of load calculation is suitable for all kinds of civil aircraft . the load conditions and the initial parameters appropriated to the load calculation are determined according to the requirement of airworthiness 本文从工程应用和适航性角度出发,对民用飞机结构载荷计算的理论与方法做了详细的研究,研究了考虑结构变形的载荷计算方法,按照适航要求确定了飞机各部件载荷计算的设计情况和原始参数。
We discuss the effect on the focusing of the probe beams for the five initial parameters : the amplitude of the pump beam , the separation between the pump and the probe beam centers , the wavelength ratio of the pump and the probe beams and the ratio of the initial beam widths at the directions of x and y . our numerical results show that , more the amplitude of the pump beam , the wavelength ratio of the pump and the probe beams and the ratio of the initial beam widths at the direction of y , more the probe focus ; the separation between the pump and the probe beam centers and the ratio of the initial beam widths at the direction of x have optimum values , respectively 研究了泵浦光束输入振幅、泵浦光束-信号光束初始偏移、泵浦光束-信号光束波长比和泵浦光束-信号光束x 、 y方向的初始束宽比五个参量对信号光束聚焦程度的影响。数值模拟结果表明,泵浦光束输入振幅越大、泵浦光束-信号光束波长比越大、 y方向束宽比越大,信号光束聚焦程度越大;泵浦光束-信号光束初始偏移和x方向初始束宽比都存在一个最佳值,使得光束聚焦达到最佳效果,有趣的是这两个最佳值的比值基本保持不变约为0 . 4 0 . 6 。
Finally , a soft sensor model of melt index in polymer reaction based on the proposed method is established , and the simulation results show that in contrast to the traditional fuzzy neural network the proposed method is not sensitive to initial parameters and possesses good convergence capability and prediction precision 最后用该建模方法建立了聚合反应中熔融指数的软测量模型,并与完全基于梯度下降的模糊神经网络软测量模型进行比较。结果表明改进的模糊神经网络对初始值的选择不敏感,并且具有很好的收敛性,同时还能达到指定的预测精度,很适合工程应用。
In addition , a new improving genetic algorithm with the alterable intercross probability and mutation probability to optimize the parameters of hydro turbine governor is presented . the simulation result doesn " t suggest that it depend on the initial parameter value of the system and the searching efficiency can be ameliorated . at the same time , it has strong robustness and is an excellent pid optimization method 提出了一种可变交叉概率和变异概率的改进遗传算法进行调节参数优化的方法,仿真结果表明,该方法有效地消除了对参数初值的依赖性,使得寻优效率大大提高,同时具有很强的鲁棒性,是一种较好的pid参数寻优方法。