| 摘要 |
FIELD: machine building. ^ SUBSTANCE: noise suppressor consists of case with flap cover filled with noise absorbing material placed into protective casing. The case is made in form of side closed surfaces with a bottom and the flap cover. A hollow chamber out of perforated sheet is installed coaxially to the case and at equal distance from its internal surfaces. Surfaces of the chamber are congruent to surfaces of the case. A sound absorbing structure is located between the walls of the case and the chamber. The structure is made in form of perforated coaxial external and internal casings. The sound absorber is installed between these casings. The sound absorber is fabricated out of at least one shaped porous sheet. Profile of the sheet in cross section can be triangle, rectangular, trapezoid, in form of circumference arcs, or sinusoidal, while side closed surfaces of the case and coaxial casings of the sound absorbing structure in cross section can also have the shape of triangle, polyhedron, ellipse, circle or any combination of these figures. ^ EFFECT: improved acoustic properties in region of low, middle and high frequencies. ^ 3 dwg |
