Device and method for amplifying suction noise

Abstract

A device for amplifying the suction noise of a vehicle is disclosed. The device comprises an intake duct, a connecting pipe and a composite membrane. The intake duct is for feeding air to an engine intake port. A connecting pipe is connected to an interior of the intake duct. The composite membrane is positioned within the connecting pipe. The composite member blocks an interior passage formed in the connecting pipe. The composite member further includes at least two elastic membranes with one of masses and rigidities that different from each other. A method is also disclosed.

1. A method for amplifying the suction noise of a vehicle, comprising:
 passing variations in air pressure transmitted into an engine intake port through a pipe that is connected to an engine, the variations in air pressure resulting in intake pulsations having one of at least two different frequencies; 
 resonating a first elastic member of a composite membrane at one of the at least two different frequencies; 
 resonating a second elastic member of the composite membrane at the other one of the at least two different frequencies; and 
 varying the air pressure transmitted to an external air side in response to one of the resonated first elastic member and the resonated second elastic member. 
 
     
     
       2. A device for amplifying the suction noise of a vehicle, comprising:
 an intake duct for feeding air to an engine intake port, 
 a connecting pipe connected to an interior of the intake duct, and 
 a composite membrane positioned within the connecting pipe, wherein the composite membrane blocks an interior passage formed in the connecting pipe, wherein the composite membrane includes at least two elastic membranes with one of masses and rigidities that differ from each other, each of the at least two elastic membranes vibrating in response to a different intake pulsation frequency. 
 
     
     
       3. The device for amplifying the suction noise of a vehicle described in  claim 2 , wherein the composite membrane further comprises a rigidity changing portion formed between the at least two elastic membranes, with the rigidity of the rigidity changing portion being different from that of the at least two elastic membranes. 
     
     
       4. The device for amplifying the suction noise of a vehicle described in  claim 3 , wherein the rigidity changing portion is one of a convex portion and concave portion formed on the surface of the composite membrane. 
     
     
       5. The device for amplifying the suction noise of a vehicle described in  claim 3 , wherein the rigidity changing portion further comprises a core member with a rigidity higher than that of the elastic membranes. 
     
     
       6. The device for amplifying the suction noise of a vehicle described in  claim 3 , wherein the rigidity changing portion further comprises:
 at least an annular rigidity changing portion of one of a circular and elliptical shape and arranged inward of an outer periphery of the composite membrane, and 
 radial rigidity changing portions that extend from said annular rigidity changing portion to the outer periphery of the composite membrane, and 
 which divide the region between the portion surrounded by the annular rigidity changing portion and the outer periphery of the composite membrane into at least two portions. 
 
     
     
       7. The device for amplifying the suction noise of a vehicle described  claim 3  wherein the at least two elastic membranes have different areas from each other. 
     
     
       8. The device for amplifying the suction noise of a vehicle described  claim 7  wherein the rigidity changing portion refers to one of a convex portion and concave portion formed on a surface of the composite membrane. 
     
     
       9. The device for amplifying the suction noise of a vehicle described in  claim 7  wherein the rigidity changing portion further comprises a core member with a rigidity higher than that of the elastic membranes. 
     
     
       10. The device for amplifying the suction noise of a vehicle described in  claim 7  wherein the rigidity changing portion further comprises:
 at least an annular rigidity changing portion of one of a generally circular and elliptical shape that is arranged inward of an outer periphery of the composite membrane, and 
 radial rigidity changing portions that extend from the annular rigidity changing portion to the outer periphery of the composite membrane, and 
 which divide the region between the portion surrounded by the annular rigidity changing portion and the outer periphery of the compo site membrane into at least two portions. 
 
     
     
       11. The device for amplifying the suction noise of a vehicle described in  claim 2 , wherein at least two elastic membranes are made of materials having one of different moduli and densities from each other. 
     
     
       12. The device for amplifying the suction noise of a vehicle described in  claim 11  wherein:
 the composite membrane has a rigidity changing portion formed between the at least two elastic membranes, with the rigidity of the rigidity changing portion being different from that of the at least two elastic membranes. 
 
     
     
       13. The device for amplifying the suction noise of a vehicle described in  claim 12 , wherein the rigidity changing portion is one of a convex portion and concave portion formed on the surface of the composite membrane. 
     
     
       14. The device for amplifying the suction noise of a vehicle described in  claim 12  wherein the rigidity changing portion further comprises a core member with a rigidity higher than that of the elastic membranes. 
     
     
       15. The device for amplifying the suction noise of a vehicle described in  claim 12  wherein the rigidity changing portion further comprises:
 at least an annular rigidity changing portion of one of a generally circular and elliptical shape that is arranged inward of an outer periphery of the composite membrane, and 
 radial rigidity changing portions that extend from the annular rigidity changing portion to the outer periphery of the composite membrane, and 
 which divide the region between the portion surrounded by the annular rigidity changing portion and the outer periphery of the composite membrane into at least two portions. 
 
     
     
       16. The device for amplifying the suction noise of a vehicle described in  claim 12  wherein the at least two elastic membranes have different thicknesses from each other. 
     
     
       17. The device for amplifying the suction noise of a vehicle described in  claim 16  wherein the composite membrane further comprises a rigidity changing portion formed between the at least two elastic membranes, with the rigidity of the rigidity changing portion being different from that of the at least two elastic membranes. 
     
     
       18. The device for amplifying the suction noise of a vehicle described in  claim 17  wherein the rigidity changing portion is one of a convex portion and concave portion formed on a surface of the compo site membrane. 
     
     
       19. The device for amplifying the suction noise of a vehicle described in  claim 17  wherein the rigidity changing portion further comprises a core member with a rigidity higher than that of the elastic membranes. 
     
     
       20. The device for amplifying the suction noise of a vehicle described in  claim 17  wherein the rigidity changing portion further comprises:
 at least an annular rigidity changing portion of one of a generally circular or elliptical shape and arranged inward of an outer periphery of the composite membrane, and 
 radial rigidity changing portions that extend from the annular rigidity changing portion to the outer periphery of the composite membrane, and 
 which divide the region between the portion surrounded by the annular rigidity changing portion and the outer periphery of the composite membrane into at least two portions. 
 
     
     
       21. A device for amplifying the suction noise of a vehicle, comprising:
 intake means for feeding air to an engine intake port, 
 pipe means fluidly connected to the intake means, and 
 composite membrane means positioned within the pipe means, wherein the composite membrane means blocks an interior passage formed in the pipe means, wherein the composite membrane means includes at least two elastic membranes with one of masses and rigidities that differ from each other, each of the at least two elastic membranes adapted to vibrate in response to a different intake pulsation frequency.