Dual chamber variable geometry resonator

Abstract

A resonator for attenuating pressure pulses is provided. The resonator includes a housing, a divider, a first neck, and a second neck. Walls of the housing form a cavity with a first and second opening. The divider is located in the cavity and cooperates with the housing to form a first and second chamber. The divider is rotatable to change the volume of the first and second chamber. The first neck is located between the first opening and the first chamber, and the second neck is located between the second opening and the second chamber.

1 . A resonator for attenuating pressure pulses, the resonator comprising: 
 a housing wherein walls of the housing form a cavity, the housing having first and second openings;    a divider located in the cavity and cooperating with the housing to form first and second chambers, respectively define first and second volumes, the divider being rotatable whereby rotation of the divider changes the first and second volume;    a first neck located between the first opening and the first chamber; and    a second neck located between the second opening and the second chamber.    
     
     
         2 . The resonator according to  claim 1 , wherein the first neck is configured to change neck length based on a rotational position of the divider.  
     
     
         3 . The resonator according to  claim 2 , wherein a neck length of the second neck is configured to change based on a rotational position of the divider.  
     
     
         4 . The resonator according to  claim 1 , wherein the first chamber has a larger cross-sectional area than the first neck.  
     
     
         5 . The resonator according to  claim 4 , wherein the second chamber has a larger cross-sectional area than the second neck.  
     
     
         6 . The resonator according to  claim 1 , further comprising an actuator connected to the divider and configured to change a rotational position of the divider based on engine speed.  
     
     
         7 . The resonator according to  claim 1 , further comprising a first valve in fluid communication with the first neck.  
     
     
         8 . The resonator according to  claim 7 , wherein the first valve is configured to vary the open area within the first neck based on the speed of the engine.  
     
     
         9 . The resonator according to  claim 1 , further comprising a second valve in fluid communication with the second neck.  
     
     
         10 . The resonator according to  claim 9 , wherein the second valve is configured to vary the open area within the second neck based on the speed of the engine.  
     
     
         11 . A resonator for attenuating pressure pulses, the resonator comprising: 
 a housing wherein walls of the housing form a cavity, the housing having first and second openings;    a divider located in the cavity and cooperating with the housing to form first and second chambers, respectively define first and second volumes, the divider being rotatable whereby rotation of the divider changes the first and second volumes;    a first neck located between the first opening and the first chamber;    a second neck located between the second opening and the second chamber;    the first neck is configured to change neck length based on a rotational position of the divider;    a neck length of the second neck is configured to change based on a rotational position of the divider;    the first chamber has a larger cross-sectional area than the first neck; and    the second chamber has a larger cross-sectional area than the second neck.    
     
     
         12 . The resonator according to  claim 11 , further comprising an actuator connected to the divider and configured to change a rotational position of the divider based on engine speed.  
     
     
         13 . The resonator according to  claim 11 , further comprising a first valve in fluid communication with the first neck.  
     
     
         14 . The resonator according to  claim 13 , wherein the first valve is configured to vary the open area within the first neck based on the speed of the engine.  
     
     
         15 . The resonator according to  claim 11 , further comprising a second valve in fluid communication with the second neck.  
     
     
         16 . The resonator according to  claim 15 , wherein the second valve is configured to vary the open area within the second neck based on the speed of the engine.  
     
     
         17 . A resonator for attenuating pressure pulses, the resonator comprising: 
 a housing wherein walls of the housing form a cavity, the housing having first and second openings;    a partition wall located in the cavity;    a first divider located in the cavity and cooperating with the housing and partition wall to form first and second chambers, that respectively define first and second volumes, the first divider being rotatable whereby rotation of the first divider changes the first and second volume;    a second divider located in the cavity and cooperating with the housing and partition wall to form third and fourth chambers, that respectively define third and fourth volumes, the second divider being rotatable whereby rotation of the second divider changes the third and fourth volume;    a first neck located between the first opening and the first chamber; and    a second neck located between the second opening and the third chamber.    
     
     
         18 . The resonator according to  claim 17 , wherein the first neck is configured to change neck length based on a rotational position of the divider.  
     
     
         19 . The resonator according to  claim 18 , wherein a neck length of the second neck is configured to change based on a rotational position of the divider.  
     
     
         20 . The resonator according to  claim 17 , wherein the first chamber has a larger cross-sectional area than the first neck.  
     
     
         21 . The resonator according to  claim 20 , wherein the second chamber has a larger cross-sectional area than the second neck.  
     
     
         22 . The resonator according to  claim 17 , further comprising a first actuator connected to the first divider and a second actuator connected to the second divider, the first and second actuator configured to change a rotational position of the first and second divider based on engine speed.  
     
     
         23 . The resonator according to  claim 17 , further comprising a first valve in fluid communication with the first neck.  
     
     
         24 . The resonator according to  claim 23 , wherein the first valve is configured to vary the open area within the first neck based on the speed of the engine.  
     
     
         25 . The resonator according to  claim 17 , further comprising a second valve in fluid communication with the second neck.  
     
     
         26 . The resonator according to  claim 25 , wherein the second valve is configured to vary the open area within the second neck based on the speed of the engine.