Relationships between the minor axis semidiameter and major axis semidiameter have been empirically determined for different structural detail geometries.
With project instance, this paper introduced the calculation procedure and method about lofting and designing the tunnel stringcourse with sweeping matrix vertical curve.
The paper offered formula for widening the curve railway, concluded theoretic widening radius of curve railway and widening value, which offers reference for platelayer.
The minimum underbalance is independent of viscosity and compressibility and of reservoir fluids.It is a function of the formation porosity, permeability and radius of perforation channels.
The influence of structure parameters which include diameter of round corner in axis, crankpin length and crankweb width and so on to stress focus place were discussed.
The unsupported and unpressurized hose shall be capable of being formed to an inner radius of ten times the internal diameter of the hose without visible kinking.
Developed excogitates of two decumbence and one hovizoutal molding die, realized increasing height of branch pipe of heat pressure tee and reducing radius of synodical arc of tee.