| 摘要 |
FIELD: transportation.SUBSTANCE: room in an amphibious transport apparatus for emergency evacuations in the regional scale comprises an acoustic ceiling, to which are attached piece absorbers, each of which contains the active sound absorbers and reactive types, placed on a rigid frame. Frame is made of two parts. Lower, reactive portion is formed as a structure of the spherical-shaped inner congruent spherical resonant cavity formed by a rigid continuous spherical shell, equidistant outer perforated spherical shell connected to the upper active part of which is made of a rigid perforated cylindrical shell with a perforated cover and solid base.EFFECT: achieved increased reliability and noise reduction unit in the performance of emergency response operations on a regional scale.1 cl, 5 dwg |
