1
Horst W W Hehmann, Robert E Kraft: Phased treatment noise suppressor for acoustic duct applications. General Electric Company, Robert C Lampe Jr, Derek P Lawrence, May 30, 1978: US04091892 (53 worldwide citation)

A phased treatment noise suppression panel is provided for use in an exhaust duct. The panel consists of individual sections designed with specific modal attenuation characteristics and located axially within the duct in such a sequential order, with respect to the noise source, as to take maximum a ...


2
Raghavan P Pandalai, Bruce A Carter, Horst W W Hehmann: Acoustic damper for a gas turbine engine combustor. General Electric Company, Andrew C Hess, Wayne O Traynham, November 11, 1997: US05685157 (42 worldwide citation)

An apparatus for suppressing or attenuating acoustic pressure oscillations in a gas turbine engine combustor, the apparatus having a quarter wave resonator with a cavity closed at a first end and open at a second end and a characteristic length that reflects waves 180 degrees out of phase with the i ...


3
Horst W W Hehmann: Fluid-impervious acoustic suppression panel. General Electric Company, Robert C Lampe Jr, Derek P Lawrence, December 19, 1978: US04130175 (25 worldwide citation)

An acoustic suppression panel is provided with a perforated plate covering a layer of a bulk absorber. A flexible, fluid-impervious membrane is placed between the plate and the bulk absorber, and supported in a manner so as to permit the membrane to become essentially acoustically transparent. An ac ...