Instead of using a single fuselage cylinder, they used two partial cylinders placed side by side to create a wider structure whose cross-section resembles two soap bubbles joined together.
When the box section design boom and a reasonable cross-section are put in danger of partial reinforcement, the arm can have good stiffness, strength, vibration stability.
当箱型臂截面设计合理且在危险截面处实施局部补强后，可使臂架具有良好的刚度，强度，振动稳定性。
3
Calculations show that polarization degree of partial polarized light beam present certain distribution on the crosssection of reflected output beam from interface.