Search

KR-102965008-B1 - meta silencer

KR102965008B1KR 102965008 B1KR102965008 B1KR 102965008B1KR-102965008-B1

Abstract

The present invention relates to a meter noise suppressor capable of effectively reducing low-frequency noise leaking through piping generated from various engines, machinery, and equipment in automobiles, ships, aircraft, factories, etc., over a wide band. The technical gist of the present invention is a meter silencer characterized by being installed on a pipe through which noise passes, and comprising a unit resonator in which a communication hole is drilled on the lower surface of the front end to communicate with the interior of the pipe and a cavity is provided at the rear end, and a first slit unit and a second slit unit are respectively installed facing each other with a gap between them on the inner left and right surfaces between the communication hole and the cavity.

Inventors

  • 송경준
  • 이수성
  • 장준영

Assignees

  • 부산대학교 산학협력단

Dates

Publication Date
20260513
Application Date
20240409

Claims (6)

  1. It is composed of a unit resonator that is installed on a pipe through which noise passes, has a communication hole drilled on the lower surface of the front end to communicate with the interior of the pipe and a cavity provided at the rear end, and has a first slit unit and a second slit unit installed opposite each other with a gap between them on the inner left and right surfaces between the communication hole and the cavity, respectively. The first slit unit is composed of a plurality of first slits that are spaced apart from each other to provide a first individual sound-absorbing space and whose length gradually increases from the connecting hole to the cavity. The above second slit unit is composed of a plurality of second slits that are spaced apart from each other to provide a second individual sound-absorbing space and whose length gradually increases from the connecting hole to the cavity. The first slit and the second slit have different lengths, The first slit unit and the second slit unit are formed asymmetrically according to the different lengths of the first slit and the second slit, and The first slit has at least one first bend formed at its end to extend the length of the first individual sound-absorbing space, and the second slit has at least one second bend formed at its end to extend the length of the second individual sound-absorbing space, A meta silencer characterized by the fact that the first individual sound-absorbing space is further extended in length by being divided into a first individual sound-absorbing space and a first individual sound-absorbing space connected sequentially by the end of the first slit by the first bending part, and the second individual sound-absorbing space is further extended in length by being divided into a second individual sound-absorbing space and a second individual sound-absorbing space connected sequentially by the end of the second slit by the second bending part, thereby expanding the rainbow capture effect.
  2. delete
  3. delete
  4. delete
  5. In paragraph 1, The above unit resonator A meter silencer characterized by covering a certain length of the pipe, being composed of multiple units, and being connected and installed along the circumference of the pipe to form a shape corresponding to the cross-sectional shape of the pipe.
  6. In paragraph 1, The above unit resonator A meter silencer characterized by covering a certain length of the pipe, being composed of multiple units, being connected and installed to each other while forming a shape corresponding to the cross-sectional shape of the pipe around the circumference of the pipe, and being installed in multiple stages along the length of the pipe.

Description

meta silencer The present invention relates to a meter silencer capable of effectively reducing noise leaking through piping generated from various engines, machinery, and equipment in automobiles, ships, aircraft, factories, etc. In general, mufflers are appropriately used in automobiles, ships, aircraft, and factories to effectively reduce low-frequency and high-frequency noise generated by various engines, machinery, and equipment. These silencers can be broadly classified into three types: one is a reflective silencer that reduces noise by utilizing impedance mismatch, another is an absorbent silencer that reduces noise by converting acoustic energy, and the remaining one is a hybrid silencer that combines a reflective silencer and an absorbent silencer. Here, reflective silencers have the advantage of being easy to design, manufacture, and maintain, but they have the disadvantage of poor sound absorption performance in the high-frequency range and require a relatively large size. In addition, while absorbent silencers have the advantage of exhibiting excellent sound absorption performance across various frequency ranges, they have the disadvantage of being difficult to design due to their complex structure, as well as requiring relatively high costs for manufacturing and maintenance. In addition, while hybrid silencers have the advantage of compensating for the shortcomings of reflective and absorbent silencers, they have the disadvantage of requiring a complex design to optimize the combination of reflective and absorbent silencers. In other words, conventional hybrid silencers have a structure that applies micro-perforated panels or membranes to existing silencers to improve sound absorption performance, but they have limitations such as poor durability and inability to properly control broadband low-frequency noise. Therefore, research and development on silencers is necessary to develop a structure that can effectively eliminate broadband low-frequency noise and exhibit excellent durability, applicable to various engines, machinery, and equipment in automobiles, ships, aircraft, and factories. FIG. 1 is a perspective view illustrating a unit resonator forming a meta-silencer according to a preferred embodiment of the present invention. FIG. 2 is a planar open view illustrating a unit resonator forming a meta-silencer according to a preferred embodiment of the present invention. FIG. 3 is an exemplary diagram illustrating a state in which a meter silencer according to a preferred embodiment of the present invention is applied in a parallel form. FIG. 4 is an exemplary diagram illustrating the state in which a meter silencer according to a preferred embodiment of the present invention is applied in a series-parallel configuration. FIG. 5 is a cross-sectional view of a first form of a meter silencer according to a preferred embodiment of the present invention, and a diagram showing the transmission loss and acoustic pressure field mode accordingly. FIG. 6 is a diagram showing the reflectance and group velocity according to the first form of the meta silencer according to a preferred embodiment of the present invention. FIG. 7 is a cross-sectional view of a second form of a meter silencer according to a preferred embodiment of the present invention, and a diagram showing the transmission loss and acoustic pressure field mode accordingly. FIG. 8 is a diagram showing the reflectance and group velocity according to the second form of the meter silencer according to a preferred embodiment of the present invention. The present invention relates to a meter silencer capable of effectively reducing noise leaking through piping generated from various engines, machinery, and equipment in automobiles, ships, aircraft, factories, etc. In particular, a major feature of the meter noise suppressor according to the present invention is that it can effectively reduce even broadband low-frequency noise and exhibit excellent durability. A meter silencer according to a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. A meta silencer (100) according to a preferred embodiment of the present invention may be composed of at least one unit resonator (200) installed to communicate with one side of a pipe (P) through which noise passes or installed to form a certain section of the pipe (P). That is, the meta silencer (100) according to a preferred embodiment of the present invention may have a form in which a single unit resonator (200) is installed alone on one side of the pipe (P), although not separately illustrated, and as shown in FIG. 3, a plurality of unit resonators (200) may have a parallel form in which they form a certain section of the pipe (P), are arranged along the outer circumference of the pipe (P) in a shape corresponding to the shape of the pipe (P), and are connected to each other, and as shown in FIG. 4, a series-parallel composite form