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Initial data obtained show the critical buckling pressure to vary as a power of the thickness and almost linearly with central angle.


Parameters examined included thickness, central angle and toroidal radius.


The desired functions are represented by the product of a power function of the radial coordinate and the unknown function of the central angle in the cross section.


The lack of 13day periodicity in the solar 10.7 cm flux is caused by its broad central angle dependence that averages out the 13day variations and produces nearly sinusoidal 27day variations.


The critical pressure is expressed explicitly by a function of the radius of the inclusion and the central angle sublended by the half length of the crack; especially it is inversely proportional to the square root of the radius of the inclusion.

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 In the feild of Acoustic Emission(AE),the location problem is dealt as the onedimentional liner location problem under normal conditions for engineering pipe. Because of thedisagreement of the theoretical analysis with practical circumstances,false location will certainly be produced. For the source location problem with close relation to the process of thesignal propagation, the circumstance of the amplitude value and the energy spectrum of AEsignal were analyzed for engineering pipes, and the statements... In the feild of Acoustic Emission(AE),the location problem is dealt as the onedimentional liner location problem under normal conditions for engineering pipe. Because of thedisagreement of the theoretical analysis with practical circumstances,false location will certainly be produced. For the source location problem with close relation to the process of thesignal propagation, the circumstance of the amplitude value and the energy spectrum of AEsignal were analyzed for engineering pipes, and the statements about the charateristic ofthem were made.In order to eliminate the affection of false location and raise the accuracvin AE detection,the regularity of the distribution about the false location was analyzed considering the linear location questions on the given engineering pipes as an onedimentinalproblem. The conclusions gotten in the theoritical aspect are as follows:as the positions ofthe source and two sensors which are not located in the same generatrix and central angle oftwo generatrix between them is increased, the time difference of false location is increasedand the position of false location is located in the direction of the sensor near the source. Thetest has been made to prove the correctness of the theoretical analysis in two kinds of engieering pipes.  对于工业管道，通常按一维问题进行线定位。由于理论分析与实际情况不相符合，必然产生伪定位。考虑到声源定位与其信号的传播过程密切相关，在工业管道上对声发射模拟源信号进行了幅值分析和能谱分析，论述了信号的幅值特性和能谱特性。为了消除伪定位的影响，提高声发射检测的准确度，对工业管道按一维线定位时的伪定位分布规律进行了分析。从理论上得到的结论为：当声源位置不在传感器所在母线上时，引起的伪定位时差随着声源所在母线与传感器所在母线之间的圆心角增加而增加，伪定位位置相对声源轴线位置偏向于相距它比较近的传感器一侧。在２种规格工业管道上进行了试验验证，试验结果与理论分析结论一致。  On the basis of thin walled curved bars theory and the variational principle, the equations of equilibrium with considering the shear lag, the bending and torsion (St. Venant and Warping) for thin walled curved box girders are established. The closed form solutions of equations can be derived by means of mathematical method. The theoretical formulas obtained are applied to caculate the shear lag effects for straight and curved box girder bridges. The Vlasov's Equation is developed. The variations of shear... On the basis of thin walled curved bars theory and the variational principle, the equations of equilibrium with considering the shear lag, the bending and torsion (St. Venant and Warping) for thin walled curved box girders are established. The closed form solutions of equations can be derived by means of mathematical method. The theoretical formulas obtained are applied to caculate the shear lag effects for straight and curved box girder bridges. The Vlasov's Equation is developed. The variations of shear lag effect of curved box girder bridge, caused by the change of factors such as the central angle of curvature, the flange width/span ratio, the flange width/web depth ratio, the flange width/thickness ratio, the flange thickness/web thickness ratio and the types of loadings are also discussed. To verify the accuracy and applicability of the present method, comparisons of results for typical numerical examples are given.  以薄壁曲杆理论为基础，运用能量变分原理，建立了薄壁曲箱梁桥剪力滞的弹性控制微分方程，并导出了弯、扭、剪力滞耦合的一般闭合解。所得的计算公式，是对符拉索夫（Ｖｌａｓｏｖ）方程的推广，适合于曲、直箱梁桥的剪滞效应计算。给出了典型的计算实例，并与有限条法数值解作了比较。最后分析了曲率中心角、宽跨比、宽高比、宽厚比、板厚比以及荷载型式等因素对剪滞效应的影响，其结果可对工程设计提供参考  In this paper, the formulas for internal forces of skew curved beam bridges with arbitrary skew degrees are derived by using the principle of forcemethod in structural mechanics. With these formulas, the influences of load positions, load types, ratio of bending and torsion stiffness, degrees of skew, central angles, etc. on the mechanical behavior of the skew curved beam bridges are analyzed, and accordingly some fundamental conclusions are generalized.  应用结构力学中的力法原理,推导了任意斜度的斜交弯梁桥的内力计算公式。以这些公式为依据,分析了荷载作用位置、荷载类型、弯扭刚度比、斜度、圆心角等因素对斜交弯梁桥受力性能的影响,得出了一些基本结论。   << 更多相关文摘 
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