Patents by Inventor Mary E. Dungan

Mary E. Dungan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors
    Patent number: 5515444
    Abstract: An active noise control system using a compact sound source is effective to reduce aircraft engine duct noise. The fan noise from a turbofan engine is controlled using an adaptive filtered-x LMS algorithm. Single multi channel control systems are used to control the fan blade passage frequency (BPF) tone and the BPF tone and the first harmonic of the BPF tone for a plane wave excitation. A multi channel control system is used to control any spinning mode. The multi channel control system to control both fan tones and a high pressure compressor BPF tone simultaneously. In order to make active control of turbofan inlet noise a viable technology, a compact sound source is employed to generate the control field. This control field sound source consists of an array of identical thin, cylindrically curved panels with an inner radius of curvature corresponding to that of the engine inlet.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: May 7, 1996
    Assignees: Virginia Polytechnic Institute and State University, Virginia Tech Intellectual Properties, The Center for Innovative Technology
    Inventors: Ricardo Burdisso, Chris R. Fuller, Walter F. O'Brien, Russell H. Thomas, Mary E. Dungan
  • Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors
    Patent number: 5355417
    Abstract: An active noise control system using a compact sound source is effective to reduce aircraft engine duct noise. The fan noise from a turbofan engine is controlled using an adaptive filtered-x LMS algorithm. Single multi channel control systems are used to control the fan blade passage frequency (BPF) tone and the BPF tone and the first harmonic of the BPF tone for a plane wave excitation. A multi channel control system is used to control any spinning mode. The multi channel control system to control both fan tones and a high pressure compressor BPF tone simultaneously. In order to make active control of turbofan inlet noise a viable technology, a compact sound source is employed to generate the control field. This control field sound source consists of an array of identical thin, cylindrically curved panels with an inner radius of curvature corresponding to that of the engine inlet.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: October 11, 1994
    Assignees: The Center for Innovative Technology, Virginia Polytechnic Institute & State University, Virginia Tech Intellectual Properties, Inc.
    Inventors: Ricardo Burdisso, Chris R. Fuller, Walter F. O'Brien, Russell H. Thomas, Mary E. Dungan