(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.
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;
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.
Based on the elastic foundation beam,the control differential equation of tunnel lining is worked out,according to the theory of Saint-Venant,the predominance equation about the center angle to the crack space is established, then the crack space of tunnel lining under the loads can be worked out and according to the crack space,the crack width can be calculated.
This author proposes the linear model and the related system, derive the linear expression which includes all the boundary conditions, and obtain the linear relationship between the dam volume function and variables, which meets the requirement of linear optimization of dam shape.
Through calculating and experiment,the angle sensor can measure 3 of angle displacement 3 with a resolution of 0.02＂ by controlling the initial angel of incidence not more than 20＂,nonparallelism errors under 30＂,and surface flatness better than λ/4 of the critical prisms two reflection faces.
Meanwhile, on the basis of the formula of bed shear stress distribution, the influences of the relative radiusof curvature r_o/B, the entrance condition τ_o, the roughness of channel bend C, the relative depth H/r_o,the angle of channel bend φ, the section configuration h/H and other factors to bed shear stress distribu-tion in channel bends are analysed. The derivatives of conclusion are in agreement with the experimentalresults of predecessors.
In the first the perturbation of the main flow does not extend to the side of the nozzle opposite to the blast: the central angle subtended by the perturbation of the exit section of the nozzle is 2γa >amp;lt; 180 ° (Fig.
The effect of the central angle of the unclosed spherical sheath and field source position on the field attenuation inside the closed thin-walled shell is studied numerically for different shell thicknesses and materials.
Enlarging the central angle of wedge-shaped segment can make the irregular deformation and dislocations of segments smaller.
A set for measuring the maximum weight and the central angle is described.
The central angle of the semilunar notch was significantly larger in the dislocation group than in the control group (P = 0.009).
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. It has been shown that the relative error of the area of this approximate deve- loping pattern is rather small.
A general formula for calculating the mandrel turning angle between any two points on the geodesie dome is given. The precision solutions and computational results of turning angles on sphere, isotensoid, ellipsoid and cone are presented.