共查询到20条相似文献,搜索用时 955 毫秒
1.
2.
3.
数字全息粒子图像测速技术(DHPIV)研究进展 总被引:1,自引:0,他引:1
全息粒子图像测速技术(DHPIV)是当前非常具有发展潜力的非定常三维流场测量技术,是一种具有点空间分辨力的三维空间三维速度场和时间历程的实验观测方法和技术. 本文介绍了该项技术(数字全息DH和粒子图像测速PIV)的发展背景和近20年来的研究进展,并介绍了已测得的非定常复杂流动的初步结果. 详细论述了DHPIV技术所面临的关键性问题和应用基础问题以及相应的进展:粒子空间场的重建与再现的空间分辨率问题、粒子定位或位移精度问题、信噪比和数字再现的光学与快速算法以及测量空间的扩展等问题.同时讨论了数字离轴全息等有关技术的潜力, 介绍了进一步的研究发展方向. 相似文献
4.
5.
6.
灌溉技术的新进展——微灌 总被引:4,自引:1,他引:3
微灌技术的出现与应用,是灌溉技术的一个进步。它是现代各种灌溉方法中,水的利用率最高的一种灌溉技术。本文综合了微灌技术的发展和特点,微灌系统的组成,设备功能与结构,以及微灌的水力学问题,指出我国微灌技术的应用前景及有待解决的问题。 相似文献
7.
8.
9.
10.
11.
摩擦接触弹塑性分析的数学规划法 总被引:4,自引:0,他引:4
本文提出摩擦接触弹塑性分析的数学规划法,是弹性接触问题解法的推广,使之能处理比例加载时的塑性效应。利用所导出接触问题总刚度阵的逆,结合参变量线性互补公式,仍可消去由接触单元而引入的惩罚因子。于是,可以获得一个弹塑性问题、弹性接触和弹塑性接触问题的有限元参数二次规划法模型。所选的几个实例说明了方法的实用性。 相似文献
12.
13.
Methods and results of studies of the three-dimensional viscoplastic stress–strain state of engineering structures under thermomechanical loading are presented. The following classes of thermoviscoplastic problems are considered: axisymmetric problems, nonaxisymmetric problems for bodies of revolution, three-dimensional problems for bodies of arbitrary shapes, and three-dimensional problems for anisotropic bodies of revolution 相似文献
14.
15.
Walter Noll 《Journal of Elasticity》2011,105(1-2):107-116
16.
17.
V. A. Ostapenko 《Archive of Applied Mechanics (Ingenieur Archiv)》2007,77(5):313-324
Initial boundary value problems are considered for rods that change length over time. These problems are transformed to problems
about rods with mobile ends. A special method which allows one to obtain exact solutions of such problems is developed. This
method is a generalization of a method of reflections for rods and strings of constant length. As an application of this class
of problems, the hoisting of ropes in mining lifts, including their problems, are considered. Exact expressions for displacements
in rods of variable length are obtained. The same results can be applied to cross oscillations of strings of variable length. 相似文献
18.
Summary The authors give four examples of inverse problems related to fluid flow in a porous media. These are the problems of identifying an unknown source term, and unknown diffusivity, an unknown porosity, and both an unknown diffusivity and porosity. The authors show how these problems can be recast into problems whoso equations are well-defined differential equations with trace type functional coefficients. The authors conclude with a discussion of the reformulated problems. 相似文献
19.
丁协平 《应用数学和力学(英文版)》2010,31(9):1049-1062
A new system of generalized mixed implicit equilibrium problems is introduced and studied in Banach spaces. First, the notion of the Yosida proximal mapping for generalized mixed implicit equilibrium problems is introduced. By using the notion, a system of generalized equation problems is considered, and its equivalence with the system of generalized mixed implicit equilibrium problems is also proved. Next, by applying the system of generalized equation problems, we suggest and analyze an iterative algorithm to compute the approximate solutions of the system of generalized mixed implicit equilibrium problems. The strong convergence of the iterative sequences generated by the algorithm is proved under quite mild conditions. The results are new and unify and generalize some recent results in this field. 相似文献
20.
功能梯度材料的热/机械耦合分析研究进展 总被引:12,自引:0,他引:12
对功能梯度材料结构的热/机械耦合问题的研究现状进行了评述,包括分析方法的进展、热载作用下的裂纹问题、优化设计问题、细观力学问题等,然后提出了需要进一步研究的方向. 相似文献