What is a smooth ceiling and a floating cloud ceiling

A: If the sound enters the hole and cannot be reflected, it cannot reach the human ear.

Add a little extracurricular.

Sound-absorbing materials are divided into two categories: porous sound-absorbing materials and resonant sound-absorbing materials. Porous materials that attenuate sound waves by relying on many small open pores from the surface to the internal sound-absorbing materials, various organic or inorganic fibers and their products with fibrous aggregate structures, as well as open-cell foam and expanded perlite products with porous structures, mainly absorb medium and high frequency sound waves. Flexible materials (e.g. closed-cell foam, absorbing intermediate frequencies), membrane materials (e.g., plastic film or cloth, canvas, lacquered cloth and artificial leather, absorbing low and intermediate frequencies), plate-like materials (e.g. plywood, hardboard, asbestos cement board and gypsum board, absorbing low frequencies) and perforated board (made by punching holes in various plate-like materials or metal sheets to absorb intermediate frequencies).

The composite use of the above materials can expand the sound absorption range and improve the sound absorption coefficient. Decorative acoustic panels for wall or ceiling mounting, a combination of porous materials and perforated panels or membranes on the wall, and even floating cloud suspension can improve indoor sound quality and control noise. In addition to absorbing airborne sound, porous materials can also attenuate vibrations caused by solid sound and empty chamber sound.

Filling a composite structure of porous materials with a variety of plate-like materials improves sound insulation and reduces structural weight.

Why haven't I heard of it? As the name suggests, it should be a flat top and a modeling roof with a light trough, or a name that people fool themselves in order to increase the price.