| 摘要 |
FIELD: transport. ^ SUBSTANCE: invention relates to aircraft engineering, particularly, to air screws. Proposed method comprises irregular arrangement of blades, mounted impairs in symmetry about screw orthogonal axes, varying screw types, determining mathematical model of computing harmonic components of variable-load vectors for every blade depending upon angles between axes of adjacent pairs of blades ö¿1. It includes also summation of load vectors from every blade along three axes OY1, OX1, OZ1 of rotary system of coordinates with initial point at screw hub center, projecting obtained vectors onto fixed axes of aircraft coordinates OfXf and OfZf, performing harmonic analysis of projection of load vectors onto lengthwise OfXf and crosswise OfZf axes and constructing dependencies of amplitudes of said harmonic components upon angles ö¿1 and selection of designed angles corresponding to minimum level of variable load harmonics. ^ EFFECT: increased life. ^ 2 cl, 7 dwg |
