Vibration dampening muffler and system

Abstract

Various methods and systems are provided for damping vibrations at a muffler. In one example, a system comprises an exhaust component, a muffler configured to receive exhaust gas from the exhaust component, and a vibration isolation device coupled between the exhaust component and the muffler, the vibration isolation device comprising a vibration dampening element and an active biasing element.

1 . A system, comprising:
 an exhaust component;   a muffler configured to receive exhaust gas from the exhaust component; and   a vibration isolation device coupled between the exhaust component and the muffler, the vibration isolation device comprising a vibration dampening element and an active biasing element.   
     
     
         2 . The system of  claim 1 , wherein the vibration dampening element comprises a spring, and wherein active biasing element is coupled to the spring. 
     
     
         3 . The system of  claim 1 , wherein the active biasing element comprises a bi-metallic structure. 
     
     
         4 . The system of  claim 1 , wherein the active biasing element comprises a one-way shape-memory alloy. 
     
     
         5 . The system of  claim 4 , wherein the alloy comprises nickel and titanium. 
     
     
         6 . The system of  claim 1 , wherein the active biasing element is responsive to a temperature of 20 degrees Celsius or greater to return to a determined shape or configuration. 
     
     
         7 . The system of  claim 1 , wherein the exhaust component is coupled to a turbocharger. 
     
     
         8 . The system of  claim 7 , wherein the vibration isolation device is coupled between an outrigger plate of an exhaust outlet of a turbine of the turbocharger and a base plate of an exhaust inlet of the muffler. 
     
     
         9 . The system of  claim 8 , wherein the vibration isolation device is a first vibration isolation device, and further comprising a second vibration isolation device that is coupled between the outrigger plate and the base plate. 
     
     
         10 . The system of  claim 8 , further comprising one or more of bellow and liner plate coupled to the outrigger plate, the one or more of the bellow and liner plate configured to seal an exhaust gas stream between the turbine of the turbocharger and the muffler. 
     
     
         11 . The system of  claim 1 , wherein the active biasing element is a first active biasing element, and wherein the muffler comprises an inner liner, an outer liner, and at least one additional active biasing element coupled between the inner liner and the outer liner. 
     
     
         12 . A muffler, comprising:
 an outer liner;   an inner liner positioned within the outer liner and configured to receive exhaust gas; and   at least one active biasing element coupled between the outer liner and the inner liner.   
     
     
         13 . The muffler of  claim 12 , wherein the at least one active biasing element is positioned along a longitudinal axis of the muffler. 
     
     
         14 . The muffler of  claim 12 , wherein the at least one active biasing element comprises a brace. 
     
     
         15 . The muffler of  claim 12 , wherein the active biasing element clamps the inner and outer liners more tightly at exhaust gas temperatures above a threshold temperature. 
     
     
         16 . The muffler of  claim 12 , wherein the outer liner is coupled to a base plate of the muffler at a first end and a top lid of the muffler at a second end, and wherein the inner liner is coupled to a stand-off of the base plate of the muffler at a first end and the top lid at a second end. 
     
     
         17 . The muffler of  claim 16 , wherein the base plate of the muffler is coupled to a turbocharger, the exhaust gas received from the turbocharger. 
     
     
         18 . The muffler of  claim 17 , wherein the base plate of the muffler is coupled to the turbocharger via one or more vibration isolation devices, the one or more vibration isolation devices each comprising a respective vibration dampening element and a respective active biasing element. 
     
     
         19 . A system, comprising:
 a turbocharger;   a muffler configured to receive exhaust gas from the turbocharger, the muffler comprising an outer liner, an inner liner positioned within the outer liner, and at least one first active biasing element coupled between the outer liner and the inner liner; and   a vibration isolation device coupled between the turbocharger and the muffler, the vibration isolation device comprising a vibration dampening element and a second active biasing element.   
     
     
         20 . The system of  claim 19 , wherein the second active biasing element is responsive to a threshold temperature to return to a determined shape or configuration, and further comprising a controller configured to increase an exhaust gas temperature to the threshold temperature or greater in response to a vibration level of the turbocharger exceeding a vibration level threshold.