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In the seismic response analysis, the effect of angle of inclination of the rock surface under the soil layer can be neglected if the angle is not more than two degrees.


Experimental data are obtained on the position of the line of separation as a function of angle of attack, cone apex angle, and flow Mach number.


Effect of angle of attack on supersonic flow past axisymmetric blunt bodies with surface injection


We consider functions f that are univalent in a plane angular domain of angle απ, 0 >amp;lt; α ≤ 2.


Use of Angle Measurements in Testing the Parameters of Materials by the Magnetic Method: I.

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 From the point of view that the protecting effect of tree belt should be chiefly dependent on the decrease rate of kinetic energy of current passing through it,we have theoretically investigated the protecting effects of tree belts of various structures.The main results are as follows: 1.The best protecting effect is given by the tree belt of mixed trees, which should be managed in such as to form a barrier of equal permeability from the ground upwards and allowing about 50% of the free wind to blow through... From the point of view that the protecting effect of tree belt should be chiefly dependent on the decrease rate of kinetic energy of current passing through it,we have theoretically investigated the protecting effects of tree belts of various structures.The main results are as follows: 1.The best protecting effect is given by the tree belt of mixed trees, which should be managed in such as to form a barrier of equal permeability from the ground upwards and allowing about 50% of the free wind to blow through it. 2.The most suitable width for the halfventilation and ventilation stri pes is 928 meters. 3.There is no visible influence on the protecting effect of the tree belt with the most suitable permeability when the wind blows within an an gle of 50° deviating from the nomal to the tree balt. 4.with increase of angle that the wind blows deviating from the nomal to the belt the protecting effect of tree belt decreases when it's permeability is less than 50% while increases within some angle when it's permeability is greater than 50%,but under 30° angle of deviation the variations of protecting effect are very slight in both cases.  本文根据林带防护效能的大小主要应决定于气流通过它时动能减小率的大小的观点,从理论上探讨了各种不同结构林带的防护效能,并确定最适宜的林带结构是上下疏密均匀的通风度为50%左右的林带,对于一般通风与半通风林带的最适宜的宽度是9—28米。此外,还证明当风向与垂直于林带方向的偏角在30°以内时对林带的防护效应并没有多大影响,而对于具有最适宜通风度的林带来说,即使风向偏角在50°以内,也不会引起林带防护效能的明显改变。所有以上这些结论都和实际经验的结果非常符合。  In the present paper, some aerodynamic derivatives corresponding to the angle of attack and the pitching and rolling motions of the arrowhead wings with and without cropped tips (see Fig. 1) in supersonic flow are considered.The wings without cropped tips are first investigated by using the pressure distributions previously determined for the basic delta wings. The results of the aerodynamic derivatives are shown in Figs. 24.The, problems of cropped arrowhead wings are solved by the lift cancellation technique... In the present paper, some aerodynamic derivatives corresponding to the angle of attack and the pitching and rolling motions of the arrowhead wings with and without cropped tips (see Fig. 1) in supersonic flow are considered.The wings without cropped tips are first investigated by using the pressure distributions previously determined for the basic delta wings. The results of the aerodynamic derivatives are shown in Figs. 24.The, problems of cropped arrowhead wings are solved by the lift cancellation technique which is the same as that of Ref. [5] for the problem of angle of attack, and is extended to the problems of pitch and roll. The basic lift cancellation fields are calculated by the linearized conical flow theory of Ref. [8]. The effects of cropped wing tips are then obtained by appropriate integrations of basic lift cancellation fields. Some numerical results are given in Figs. 711.The results hold for wings with supersonic trailing edges for which the Mach lines emanating from the wi. tips may not intersect on the wing.  本文研究了超声速气流中未削梢和削梢箭形机翼在攻角、俯仰和滚转问题中的某些气动导数.讨论了未削梢箭形机翼问题的解,它可以利用已有的压力分布给果来计算;对于削梢箭形机翼,则以未削梢的解为基础,利用开力抵消法来求削梢的影响.给出了未削梢箭形机翼气动导数的曲线;对于削梢的影响,则利用文献[8]的方法求出了有关的计算公式,并对某些情形进行了数值计算,绘制了相应的曲线. 本文主要考虑左右两翼梢顶点的Mach线不在机翼内相交的超声速后缘机翼的情形.  This paper is concerned with the iniluence of torsional rigidity of transverse beams on the postbuckling behavior of transversely framed deck plates.The Karman differential equations of the large deflection theory of thin plates are solved by using BoobnovGalerkin method.The approximate formulas of the reducing factor φ of the deck plates concerning the restraining effect of transverse beams are then obtained.Numerical calculation is made for four sizes of angles and T profiles, which may be happened... This paper is concerned with the iniluence of torsional rigidity of transverse beams on the postbuckling behavior of transversely framed deck plates.The Karman differential equations of the large deflection theory of thin plates are solved by using BoobnovGalerkin method.The approximate formulas of the reducing factor φ of the deck plates concerning the restraining effect of transverse beams are then obtained.Numerical calculation is made for four sizes of angles and T profiles, which may be happened in the shipbuilding.The results are represented in table and graphically.From the numerical calculation, the following conclusions are drawn.Firstly, the solution of P.A.Sokolov is adapted to the plate of ratio λ(=b/a), which is greater than two.If the ratio is less than two, the beneficial effect of restrained effect of transverse beams on the stability and postbuekling behavior of the deck plates should be taken into account.This beneficial effect is increased with the increase of size of profiles of beams, and is decreased with the increase of the ratio λ.In this case, the solution of P.A.Sokolov is not adaptable.Secondly, when the ratio λ is greater than two, multiple approximations are then required.In case of square plate the first approximation is quite accurate in practice.On the basis of above conclusions a formula for estimating the reducing factor of deck plates concerning the restrained effect of transverse beams is recommended.  本文主要讨论了考虑横梁抗扭刚度对甲板板在丧失稳定性以后的工作性能的影响。文中应用布勃诺夫迦辽金法求解了V.卡门(Karman)微分方程组。从而导得了考虑横梁抗扭刚度对板的减缩系数φ的近似计算公式,并对当前船用的横梁可能尺度和型式进行了数值计算,列成了表格和曲线。计算结果表明:对于横骨架式船舶甲板板失稳后的减缩系数在边长比大于2时采用索柯洛夫解是适宜的。但是在边长比小于2时,计及横梁的抗扭刚度对甲板板的稳定性及失稳后的工作性能起有利的影响。这种影响随型钢尺寸的增大而增加,随比值λ=a/b的增加而减小。此时索柯洛夫的解给出了过低的减缩系数值。计算结果还发现当λ大于2时,进行多次近似计算是必要的。而对于正方形板,一次近似计算是足够精确的。在这些论点的基础上,本文最后对正方形板计及横梁的弹性固定作用时在失稳后的减缩系数建议采用计算公式φ=0.53+0.47(1/n)。   << 更多相关文摘 
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