Acoustic metamaterial-based muffler for exhaust noise reduction
AssigneesAjou University Industry-Academic Cooperation Foundation, Center for Advanced Meta-Materials
InventorsJin Woo Lee, Gyeong Ju Lee
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Abstract
The present disclosure provides an acoustic metamaterial-based muffler for exhaust noise reduction, including an exhaust flow body that is provided with an inlet through which exhaust gas of an internal combustion engine flows in on one side, and an outlet through which the exhaust gas flows out on the other side, and a flow passage for guiding a movement of the exhaust gas therein; and a plurality of noise reduction units that are sequentially disposed along a discharge direction of the exhaust gas inside the exhaust flow body to reduce noise in a specific frequency band in exhaust noise of the exhaust gas caused by the movement of the exhaust gas on the inside of the exhaust flow body.
Claims16
An acoustic metamaterial-based muffler for exhaust noise reduction, comprising:
- an exhaust flow body that is provided with an inlet through which exhaust gas of an internal combustion engine flows in on one side, and an outlet through which the exhaust gas flows out on the other side, and a flow passage for guiding a movement of the exhaust gas therein;
- and
- a plurality of noise reduction units that are sequentially disposed along a discharge direction of the exhaust gas inside the exhaust flow body to reduce noise in a specific frequency band in exhaust noise of the exhaust gas caused by the movement of the exhaust gas on the inside of the exhaust flow body,
- wherein the noise reduction units comprise a first noise reduction unit, a second noise reduction unit, and a third noise reduction unit disposed sequentially from the inlet to the outlet inside the exhaust flow body along the discharge direction of the exhaust gas,
- wherein the first noise reduction unit comprises:
- a first reduction chamber portion provided with a first reduction inlet on one side and a first reduction outlet on the other side;
- a first reduction inlet pipe provided on one side of the first reduction chamber portion to be connected to the first reduction inlet;
- and
- a first reduction outlet pipe provided on the other side of the first reduction chamber portion to be connected to the first reduction outlet;
- wherein the second noise reduction unit comprises:
- a second reduction chamber portion provided with a second reduction inlet on one side and a second reduction outlet on the other side;
- a second reduction inlet pipe provided on one side of the second reduction chamber portion to be connected to the second reduction inlet;
- and
- a second reduction outlet pipe provided on the other side of the second reduction chamber portion to be connected to the second reduction outlet,
- wherein the third noise reduction unit comprises:
- a third reduction chamber portion provided with a third reduction inlet on one side and a third reduction outlet on the other side,
- a third reduction inlet pipe provided on one side of the third reduction chamber portion to be connected to the third reduction inlet, and
- wherein diameters of the first reduction inlet pipe, the second reduction inlet pipe, and the third reduction inlet pipe are same.
Dependencies are inferred from the claim text.