Herschel-Quincke tube for vehicle applications

A method of manufacturing a Herschel-Quincke tube arrangement comprising the steps of:

• a) forming a first passageway and second passageway fluidly connected to the first passageway at first and second junctions with the second passageway divided by the junctions into first, second, and third passages, the first and second passageways being generally planar, the first passageway extending from an inlet to the tube arrangement to an outlet from the tube arrangement;
• b) forming the first passangaeway in a nonplanar configuration;
• and
• c) securing at least one of the first and second passageways to a vehicle component;
• and
• d) coupling the outlet to a vehicle engine.

A method of designing a Herschel-Quincke tube arrangement comprising the steps of:

• a) representing a tube arrangement including a first passageway and second passageway fluidly connected to the first passageway at first and second junctions, the second passageway divided by the junctions into first, second, and third passages;
• b) associating lengths with each of the first passageway and the first, second, and third passages;
• c) analyzing a ratio of average transmission loss over a selected frequency range to standard deviation of the transmission loss over the selected frequency range as a function of the lengths of the first, second and third passages and the first passageway;
• and
• d) based upon the analysis of the ratio in said step e), selecting lengths for each of the first, second and third passages and the first passageway for the Herschel-Quincke tube arrangement;
• wherein the second passage looped about a first axis and curved about a second axis not parallel to the first axis.