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the steel plates, the section steels and the channel steels. Truss element T3D2 was applied in the simulation of the binding bars. 3D stress element C3D8 was used to simulate the concrete. Embedded......
H/D随不同修正弗劳德数Fr′的变化情况如图5所示. 由图5可知:当修正弗劳德数Fr′由1.27增加至17.8时,气体的H/D与修正弗劳德数Fr′呈非线性增加的关系,其穿透深度H增加约3D;当修正弗劳德数Fr′较小时,气体H/D变化量较大;当修正弗劳德数Fr′增加时,其变化量逐步减小.这主要是因为当修正弗劳德数Fr′较小时,此时气体穿透深度H主要受限于单气泡的直径;随着修正弗劳德数Fr′的增大,喷......
. [12] TORREGROSA A J, FAJARDO P, GIL A, NAVARRO R. Development of nonreflecting boundary condition for application in 3D computational fluid dynamic codes [J]. Engineering Applications of Computational......
, 夏国清, 赵为光. 基于海流观测器对欠驱动水下机器人进行三维路径跟随[J]. 控制理论与应用, 2013, 30(8): 974-980. YANG Ying, XIA Guoqing, ZHAO Weiguang. Path following in 3D for underactuated autonomous underwater vehicle based on ocean......
of electroformed mold inserts without help of three validated methods (a) and with help of three validated methods (b) Fig. 11 4 mm thick nickel micro lens array mold insert (a) and 3D contour of a single lens......
-speed extrusion and isothermal extrusion of 6061 Al alloy using 3D FEM simulation[J]. Journal of Materials Processing Technology, 2001, 114(2): 145-153. [12] 杨磊, 李好文. 基于DMC-模糊PID的模拟等温挤压控制系统研究[J]. 锻压技......
of Jilin University (Engineering and Technology Edition), 2007, 37(4): 822-827. [10] ONO I, NAKASHIMA H, SHIMIZU H, et al. Investigation of elemental shape for 3D DEM modeling of interaction between soil......
模.齿轮传动参数如下:小轮齿数为25个;大轮齿数为33个;模数为4 mm;压力角为25°;齿顶高系数为1;顶隙系数为0.25;齿宽为28 mm.设齿条刀具无凸台,过渡曲线由刀具圆角部分切出,圆角半径为1.2 mm.根据该齿轮几何参数,通过CATIA软件的二次开发,虚拟加工离散运算对毛坯进行切削处理,然后提取切削的刀痕线并拟合成齿面,从而生成几何模型,如图1所示. 图1 齿轮3D几何模型 Fig. 1 3D geometrical model of gear pair 1.2 修形齿轮修形参数设置 工程中齿轮修形主要有鼓形修形和齿高修形2种形式,齿高修形如图2所示.齿高修形可以有效降低轮齿的啮入,啮出冲击,有效改善齿轮系统的传动性能,在实际工程中应用广泛. 齿高修形参数主要包含齿顶修形量△A,修形起始点位置△D(即修形起点到齿顶的径向距离,一般采用修形起......
S, MOHAMMADI B. Incomplete sensitivities for 3D radial turbomachinery blade optimization[J]. Computers and Fluids, 2008, 37: 1354-1363. [15] DERAKHSHAM S, NOURBAKHSH A. Theoretical, numerical......
are created by the LPM and FEM, respectively. Fig. 1 Aluminum electrolytic capacitor and PVC hose Fig. 2 Top view of aluminum electrolytic capacitor casing machine Fig. 3 3D model diagram of hose charging......