2results about How to "Effective sound absorption" patented technology

This utility model discloses a polishing mechanism for the production of automotive semi-circular chuck parts, relating to the field of automotive semi-circular chuck part production technology. It includes a placement frame; a buffer base fixed to the lower inner side of the placement frame; a polishing body fixed to the upper end of the buffer base; a lifting mechanism installed and connected to the upper inner side of the placement frame; and a sound-absorbing closing mechanism installed and connected to the lower end of the lifting mechanism, located above the polishing body. When the lifting mechanism extends or retracts, it can change the position of the sound-absorbing closing mechanism to engage and close at the upper end of the polishing body, thereby reducing the noise caused by internal vibrations of the polishing body.

The invention discloses a slit type multi-temperature acoustic metamaterial based on a porous substrate, and particularly relates to the technical field of metamaterials, the metamaterial is a three-dimensional structure formed by combining and arranging a plurality of unit cell structures, and the edge part of the metamaterial is a half unit cell structure; the unit cell structure comprises an inner base body and an outer base body, a slit type perforation channel is formed between the inner base body and the outer base body, and the inner base body and the outer base body are of a unit cell structure. The slit-type multi-temperature acoustic metamaterial based on the multi-scale design of the porous matrix has the advantage of good designability, the geometrical shape and the material of the metamaterial can be customized and designed to a certain extent according to requirements, and the physical geometrical parameters of the metamaterial can be adjusted according to specific requirements, so that the reasonable and excellent sound absorption effect in different temperature environments can be achieved.