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热流qi时,假设qi在RΔθ时间间隔内为一个常数,R为未来时间步长,如图1(b)所示,未来时间步长R的正确选择有助于改善反求算法的稳定性. 图1 热流被离散求解的情况 Fig. 1 Schematic illustration of discrete heat fluxes in inverse algorithm 采用反热传导算法求解界面热流时,需要设置相应的计算参数...: (4) 图2 固体界面反热传导算法流程图 Fig. 2 Flow chart of inverse heat conduction algorithm for solid......
Optimized selection of discrete wavenumbers for inverse Fourier transform in 2.5D DC resistivity modeling PAN Kejia1, 2, TANG Jingtian1 (1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals..., China) Abstract: The optimized selection method was improved in terms of both the optimization model and computational method for selecting the discrete wavenumbers of inverse Fourier transform, which......
, the inverse segregation grade of Zn decreases effectively. With the increase of the ultrasonic power, the microstructure becomes finer and more uniform, the distribution of solute elements is more.... Key words: 7075 aluminum alloy; semi-continuous casting; inverse segregation; ultrasonic; cavitation; segregation ratio 7050铝合金是Al-Zn-Mg-Cu系高强铝合金,在保持较高强度水平下具有韧性好,疲劳强度高,抗腐蚀能力强等综合性能,是广泛应用于飞机制造的航空高强度铝......
was obtained. With the inverse method, film thickness was calculated. Finally, the influence of pre-compression, pressure and out velocity on average film thickness, internal leakage and dynamic friction...: DAS composition seal ring; inverse method; film thickness; leakage flow rate; dynamic friction 密封件失效是导致液压缸内泄漏故障的关键原因之一,国内外学者针对O形[1-2],Y形[3-4],滑环组合密封圈[5]等常见活塞密封圈进行了大量研究.对密封特性的研究大多采用逆解法求解雷诺方程获得润滑油膜厚度......
. The proposed SMCBL was compared with inverse dynamic control (IDC), a conventional nonlinear control method. The kinematic and dynamic equations of the IRB-120 robot manipulator were initially extracted... on an actual IRB-120 robot manipulator. Key words: robot manipulator control; IRB-120 robot; sliding mode control; sliding mode control with boundary layer; inverse dynamic control Cite this article......
based on state inverse solution[J]. Journal of Central South University(Science and Technology), 2021, 52(4): 1185-1196.......
Hybrid control based on inverse Prandtl-Ishlinskii model for magnetic shape memory alloy actuatorZHOU Miao-lei(周淼磊), GAO Wei(高巍), TIAN Yan-tao(田彦涛)(Department of Control Science and Engineering... was developed to characterize the hysteresis of magnetic shape memory alloy actuator. Based on the proposed Prandtl-Ishlinskii model, the inverse Prandtl-Ishlinskii model was established as a feedforward......
旋转角度的坐标变换公式为 (1) 式中:(,)和(x,y)为旋转前后的图像坐标. 旋转叶片在转动时发生了刚体旋转和平移以及变形,可描述为仿射变换: (2) 式中:,,和为旋转,拉压和剪切状态矩阵的元素;为平移系数.对于参考图像和变形图像检测得到的对特征点坐标,代入式(2)可得 (3) 式(3)可简记为,;;;对应解为.有了仿射变换参数后,旋转在整个仿射变换中占主要成分,可直接根据估计出旋转角度.式(2)还可简化为 (4) 其中:,.旋转角度可根据和估计得出. 对照式(1),可得 (5) 在(m1,m2,m3,m4)和(,)已知的条件下,求解式(5),可得旋转中心为 &......
在两个峰值. 关键词:A356铝合金;凝固潜热;等效比热法;反热传导;界面换热系数 中图分类号:TG249.2 文献标志码:A Inverse heat conduction model for determining interfacial heat transfer coefficient during casting...) with the latent heat released during the solidification of the molten, a model of inverse heat conduction based on the equivalent specific heat method was established. The effects of some parameters......
Application of inverse method to estimation of boundary conditions during investment casting simulationHaipeng JIN and Jiarong LI National Key Laboratory of Advanced High Temperature Structural... 100084,China摘 要:Inverse method was used in single crystal superalloy DD6 processing simulation during solidification.Numerical modeling coupled with experiments......