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    In order to reduce the effect of friction and the flat quality of specimen on test results,the better choice of central angle of the flat is 20°~30°。
    综合考虑摩擦效应和平台加工质量的影响,圆盘中心角以20°~30°为宜。
    Calculation of the Central Angle of Pressure Vessel Wound Type Heads
    压力容器缠绕封头中心角计算
    (2) Through the analysis of perpendicular experiments, three characteristic parameters of bar grating obstructions (the radius of the obstructions r, the width of space b0 and the width of the bar grating b) and two characteristic parameters of spherical obstruction (the radius of the obstructions r and central angle α) play very prominent influences on explosion impulse.
    (2)通过对正交实验分析得出,条栅形障碍物三个特性参数(障碍物半径r、空隙宽度b_0、条栅宽度b)和球袋形障碍物的两个特性参数(障碍物半径r、中心角a)对爆炸冲量都有非常显著的影响。
    The stability of arch dam is studied. The reasonable line shape of arch and the optimal central angle in condition of stabilization of dam body is discussed.
    对拱坝坝体稳定进行研究,探讨坝体稳定条件下的合理拱圈线型以及拱坝稳定最优中心角;
    A circular ring sector with appropriate radii and central angle may be taken as approximate developing pattern of a coil of an undevelopable right helicoid.
    具有适当半径和中心角的圆环扇形可取为不可展正螺旋面一个导程的曲面的近似展开图。
    By investigating the deviation of the cylinder cam receway fabricated with the generalmethod for a circular knitting machine from the designed curvature equation and the inherentradial inclination of cam raceway herefrom observed,the author gives the following sugges-tion:giving the curvature equation y=Ψ(θ) in terms of the central angle θ as the independentvariable;
    本文对目前所普遍采用的针织圆纬机针筒三角走针跑道的加工方式与设计方程不一致,以及因加工方式本身引起的跑道不良径向倾斜等问题,进行了分析探讨,提出了如下解决途径:在设计上,把方程式表示为以中心角θ为自变量函数 y=ψ(θ)。
    When the half central angle is small, the arch will freely vibrate about the position different from the original static one after the rectangular loading is finished.
    对圆拱的分析表明,当中心角之半θ_0较小时,矩形荷载作用完后圆拱在偏离原静止状态的位置附近自由振动。
    Compared with the measured values of the burden profile on blast furnace No. 2 in Xiangtan Iron and Steel Company,the values of the Peripheral angle and central angle of burden profile calculated in our mathematical model are in agreement with the actal measured values.
    与湘钢2#高炉实测料面值比较,用本数模计算出的料面边缘角和中心角与实测值基本一致。
    The third precise approximation to the symmetric instable critical loda for the articulated and fixed support circle arch under uniform pressure is obtained by Ritz method. The approximations to the critical load are listed for the central angle 2θ 0=0.2~π. In addition,the accurate values of the critical load for the ring under different numbers of waves can be deduced in calculating the critical load for the circle arch.
    选择了拱轴失稳形状函数,按Ritz法求得铰支和固支圆拱受径向均布荷载作用时具有高精度的正对称失稳临界力的第3次近似值.列出中心角2θ0=0.2~π时的临界力近似值表格.文中在圆拱临界力的计算中,可同时导得圆环按不同波数失稳时临界力精确值.
    Round arch dam can be designed in the narrow gullies for debris dams, which should be of larger than 80 degree of central angle of the arch at the dam tops.
    拦渣坝坝址处沟道狭窄时,可修筑浆砌石圆拱坝,坝顶拱圈中心角不能小于80°
    It was found in this paper that the stability which cylindes under external pressure with logitudinal stiffening ribs have improves remarkably when adjacent ribs has smaller central angle than initial under stabilization wave.
    本文研究表明,当相邻筋间中心角小于其原始失稳波中心角时,带纵向加强筋外压圆筒的稳定性会有显著提高;
    So it must be studied whether the Griffith criterion in tensile region is true or not true,and how to choose the central angle of flattened disk. The flattened disks of granite,sandstone,lime and diabase with central angle of 20°~90° are tested.
    对花岗岩、砂岩、石灰岩和辉绿岩,以中心角20°~90°的平台巴西圆盘进行劈裂试验,圆盘不是沿中心线破坏,且抗拉强度随平台中心角增大而增大。
    The disks crack symmetrically when plastic cushions with thickness of 0.5 mm are used. But the plastic cushions produce new friction in opposite direction,which causes that the strength of disk decreases with increment of central angle.
    垫入0.5mm厚聚四氟乙烯薄片可使平台圆盘沿中心线破裂,但垫片侧向变形大于岩石,平台受到指向外侧的摩擦力,使得圆盘强度随中心角的增大而降低。
 

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