历史查询   







 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 
Movable connections can be constructed by form closure, force closure, and compliance of an anisotropic segment between two rigid segments.


The minimum requirements for the form closure of a rigid body are investigated.


Goldberg points along the continuous boundary of the part that achieves form closure the contacts can resist any applied forces and torques.


In future research, the optimal placement of fixels and form closure will be addressed.


In this case, Form Closure or Force Closure condition should always be satisfied strictly.

 更多 
In this paper, we present an approach for optimally selecting the locating positions of workpieces and identifying feasible clamping regions that meet the requirements of the formclosure principle for fixture layout.


Secondly, this approach computes the clamping wrench cone and its member wrench can form a formclosure fixture layout, together with the formerly selected locating points.


Both formclosure (complete immobility of the assembly), and firstorder stability (stability of an assembly in the neighborhood of a specific external force and torque on each body) are considered.


It is also essential to consider the formclosure restraint during the exchange procedure.


Outputsensitive computation of all formclosure grasps of a part bounded by algebraic arcs.

 更多 
Spherical shape (closed surfaces) and recess both introduce additional internal strains which are relieved by deviations of the molecular array in the basic pattern (moiré and knotty aspects).


Weighting functions may be used to shape closedlooptransfer functions to within tight bounds provided by simple singular value inequalities.




 To avoid and eliminate surface votex which often caused unstable flow in openal suction channel a closed belldraft suction casing has been applied in icmake design of a Jiangsu Ⅱ type pump station. The results of site measurement shows that operation efficiency of 38WZL118 type pumping installation after the remake design is over 50%, and about 3—10%more than the one of before redesign. The suction casing is also used for 38WZL—100 type pump, which provides greater rating discharge, and the same higher efficiency... To avoid and eliminate surface votex which often caused unstable flow in openal suction channel a closed belldraft suction casing has been applied in icmake design of a Jiangsu Ⅱ type pump station. The results of site measurement shows that operation efficiency of 38WZL118 type pumping installation after the remake design is over 50%, and about 3—10%more than the one of before redesign. The suction casing is also used for 38WZL—100 type pump, which provides greater rating discharge, and the same higher efficiency is atained.  针对半封闭式进水流道在圬工泵站中应用所存在的进水流态不平稳的问题,提出采用钟形封闭进水流道进行改型试验。现场测试结果表明,流道改型后的38WZL—118泵装置的最高效率已超过50％,比改型前运行效率提高3—10％。抽水流量较大的38WZL—100泵配用该流道也同样获得较高的装置效率。  The application of BEM to the calculation of acoustic radiation from closed surfaces in an infinite acoustic medium has the advantages of less memory space, higher accuracy and faster calculating speed. However, the singular integrals and the nonuniqueness problem of surface Helmholtz equation at characteristic frequencies .should be dealt with. We suggest in this paper combination of the interior Helmholtz equation and its derivatives with respect to the coordinates of an interior point to form an extra equation,... The application of BEM to the calculation of acoustic radiation from closed surfaces in an infinite acoustic medium has the advantages of less memory space, higher accuracy and faster calculating speed. However, the singular integrals and the nonuniqueness problem of surface Helmholtz equation at characteristic frequencies .should be dealt with. We suggest in this paper combination of the interior Helmholtz equation and its derivatives with respect to the coordinates of an interior point to form an extra equation, in order to solve the problems of acoustic radiation at various frequencies with surface Helmholtz equation; on the area which includes singular point, singular integrals are converted to ordinary ones by polar coordinate transformation. As an example, the acoustic radiation field of closed axisymmetric surfaces with prescribed surface velocity distribution is calculated in the paper.  采用边界元法求解封闭面在无限域声媒质中的辐射声场具有内存小、计算精度高、速度快等优点。但需处理被积函数在边界面上的奇异积分及表面Helmholtz方程在特征频率下无唯一解的问题。本文提出把内部Helmholtz方程与它关于内点坐标取导后的式子构成补充方程式,经与表面Helmholtz方程相结合,可求解任意频率下的声辐射问题;而在奇点附近区域,则提出用极坐标变换消除积分的奇异性。文中以轴对称形封闭面为例,计算了具有已知表面振速分布下的辐射声场。  In this paper a numerical prediction has been made for the natural convection heat transfer between a cylindrical envelope and internal concentric slotted octagonal cylinder. The range of Rayleigh number of the calculation is 1.5×103 to 1.0×105. The numerical results are compared with experimental results available in literature. It is found that the maximum relative difference between the computed average equivalent thermal conductivities and the experimental ones is less than 9%. The predicted streamlines... In this paper a numerical prediction has been made for the natural convection heat transfer between a cylindrical envelope and internal concentric slotted octagonal cylinder. The range of Rayleigh number of the calculation is 1.5×103 to 1.0×105. The numerical results are compared with experimental results available in literature. It is found that the maximum relative difference between the computed average equivalent thermal conductivities and the experimental ones is less than 9%. The predicted streamlines agree with the photographs of flow visualization quite well.  本文用差分法获得了开缝八边形封闭母线自然对流散热的数值解。计算得到的平均当量导热系数及流线图与实验结果十分吻合。   << 更多相关文摘 
相关查询  



