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×wall thickness) as the objective, the single-factor experimental analysis and the 3D-FE based numerical orthogonal test are conducted to address the effects of forming parameters on the springback...)) as the objective, using the single-factor experimental analysis and numerical orthogonal method, the effects of bending parameters on the springback were studied. Since the springback radius is so minor, only......
surface was deduced. Orthogonal rotation combination design with contrasting predictive value was used to select sampling points to obtain the optimal experimental area. Based on the principle of NSGA... optimization algorithm; orthogonal rotation combination design; optimization system 在结构优化设计领域中,采取样本点,建立代理模型(响应面),组建分析方法(优化算法)是三大关键环节.在对复杂的实际工程问题进行优化设计时常遇到以下阻碍:1) 试验设计样本点发生改变,常引起预测值方差发生改变,导致不同点间的预测值无法对比,难以得到最优试......
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指标的影响,并初步获得较优的水平组合[17].将聚风挡板长度L,偏转角θ,与叶片旋转中心的水平布置距离X以及垂直布置距离Y作为正交试验设计的4个因素,聚风挡板厚度为10 mm,高度为1 200 mm.对于所设定参数,选用4因素3水平的L9(43)正交表[18],如表3所示. 表3 正交试验设计因素水平表 Table 3 Orthogonal test design factor level 基于表3中的参数,设计正交试验如表4所示. 表4 正交试验设计安排 Table 4 Orthogonal test arrangement 2.2 计算结果与分析 由CFD仿真计算可得到叶片的力矩系数Cm,进而求得平均力矩系数Cmave,再由式(5)和(6)计算得到风力机平均转矩M和风能利用率Cp. (5) (6) 式中:ρ为空气密度,kg/m3;为来流风速,m/s;为扫掠面积,m2;L为特征长度......
验组合和仿真结果见表3.横波纯度定义为横波分量与纵波分量比值r/z.螺旋线圈EMAT在产生横波的同时也会形成纵波,在实际检测中,纵波及其模式转换波的存在可能干扰缺陷定量的可靠性和准确性,甚至可能导致缺陷的误判.因此,横波纯度也是螺旋线圈EMAT的重要评价指标. 表3 激励EMAT的6因素3水平正交试验表 Table 3 Orthogonal test table of six elements...果与实验结果基本一致;多层线圈串联时,线圈等效阻抗增大,激励电流减小,并且随着串联线圈层数增加,永磁体与试样距离变大,导致超声波幅值显著降低;多层线圈并联时,线圈等效阻抗变化较小,单个线圈激励电流降低,新增线圈产生的洛仑兹力减小,导致超声波幅值缓慢下降. 图12 多层线圈串并联仿真和实验的曲线比较 Fig. 12 Comparison of simulation and experimental......
IM&P, 2009(9): 23-27. [6] 杨剑秋, 王延荣. 基于正交试验设计的空心叶片结构优化设计[J]. 航空动力学报, 2011, 26(2): 376-384. YANG Jianqiu, WANG Yanrong. Structural optimization of hollow fan blade based on orthogonal experimental design..., 2010, 27(9): 52-55. LIU Ruijiang, ZHANG Yewang, WEN Chongwei, et al. Study on the design and analysis methods of orthogonal experiment[J]. Experimental Technology and Management, 2010, 27(9): 52-55. [15......
水平变量4分别对应目前大多智能压实施工参数的最大值与最小值,水平变量2和水平变量3分别采用内插法确定. 表3 5因素4水平正交试验表 Table 3 Five factors and four levels of orthogonal test table 表4 正交试验工况 Table 4 Orthogonal test condition 1.4 基于统计学方法的压实质量均匀性与影响范围计...,为mij的平均值.反映第i因素对智能压实质量评价指标CMV的影响,极差.Ri越大,说明该因素对智能压实质量评价指标CMV的影响也越大,对应的因素是最主要的因素,对应的因素为所有因素中影响最小的因素.正交试验极差分析结果如表6所示.从表6可以看出: 表6 正交试验极差分析表 Table 6 Range analysis table of orthogonal test 1) 碾压速度,碾压遍数,激......
)11-3478-08 Behavior analysis of composite ground with flexible foundation using orthogonal test YU Jian-lin1, LI Jian-qing1, L? Wen-zhi1, 2, GONG Xiao-nan1 (1. Ministry of Education Key Laboratory...-soil stress ratio, neutral plane position and impact factors which were closely related to the systemic load transfer law were studied using orthogonal test method, and based on the analytical......