| 摘要 |
494,762. Vibrationdampers for turbines, airscrews, silencers, &c.; shafts. DRESAG AKT.-GES. April 26, 1937, No. 11890. Convention date, April 27, 1936. [Class 108 (iii)] [Also in Groups XXIV, XXVI, XXVII, and XXXIII] Means for damping lateral oscillations of bodies comprises a loose damping mass of low elasticity arranged at the point of maximum amplitude of oscillation of the body and displaceable a uniform amount in the direction of oscillation, the displacement being at least twice the amplitude of oscillation of the body and the whole being such that at each change of direction of oscillation the damping mass and oscillating body impinge against each other at the greatest possible velocity when moving in opposite directions. As shown in Figs. 10, 11, a loose mass of lead &c. 7 is mounted in a groove 6a in propeller blades 6 to damp oscillations set up in the direction of the arrows H, J. In Fig. 12, loose rings 11 are mounted in grooves 10b on a rotor hub 10 to damp oscillations set up in the direction of the arrows K, L. In Fig. 13, a loose sleeve 21 of copper alloy &c. is guided between rings 22 on a silencer 13b to damp the lateral oscillations. The silencer is built up of sections 12a ... 12f, Fig. 14, separated by sheets of sound-absorbing material such as asl estos. The inner sides of the sections forming the tube 12 are punched outwardly to form air scoops 24 and the outer sides forming the tube 13 is flared at 13a in the direction of the incoming air and is swaged inwardly at 13b to increase the velocity of the air discharged. The path of the air and exhaust gases are shown by the arrows M and N respectively. |
