pole stand

The approximate solution of round rod's natural twist vibration is obtained by Fourier series mcthod, and the natural twist vibration character of round rod with nonlinear material is analyzed by calculating concrete examples.

利用非线性材料的本构关系,建立了非线性材料圆杆的扭转固有振动方程,然后采用傅立叶级数法求得了圆杆扭转固有振动的所似解,通过实例计算讨论分析了非线性材料圆杆的扭转固有振动特性。

There are shear stresses as well as normal stresses,which can be neglected in the cases of small deformation,on the section of round straight bar under free torsion.

等直圆杆在自由扭转时,截面有剪应力及正应力,在小变形情况下,正应力远小于剪应力,可以略去不计。

The numerical results of its capacities for different configurations(the symmetric and asymmetric,coaxal and non-coaxial double- cylinders and double elliptic cylinders) inner conductors are presented.

文中还考察了电容系数随各个几何参数改变的情况，并作了定性解释，最后绘出双椭圆杆内导体的电容系数结果。

By use of V notched round bars with different theoretical stress concentration factors as finite element models (FEM) of tensile screw threads, stress intensity factors(SIF) of surface cracks of screw threads are calculated.

将拉伸螺杆简化为理论应力集中系数Kt不同的带“V”形缺口圆杆,采用裂纹尖端为20节点奇异单元的三维有限元模型,对螺杆半椭圆表面裂纹的应力强度因子进行了计算。

According to the calculation principles of "hypotenuse-height method" and "three-point method" and the prizing and pressing traces in the criminal scene causing by round-pole shape tools , we can get the diameters of the tools .

利用圆杆状工具在刑事案件现场中遗留的撬压痕迹,根据弦高法和三点法的计算原理,可以得到形成痕迹的工具直径的大小。