Patents by Inventor Steven F. Griffin

Steven F. Griffin 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).

  • Publication number: 20210329384
    Abstract: An energy harvesting circuit is disclosed and comprises one or more electrical loads that consume direct current (DC) power, a rectifier, and a hybrid acoustic absorber. The rectifier comprises one or more active switching elements that are driven by a gate drive voltage. The hybrid acoustic absorber comprises a diaphragm and a voice coil. The diaphragm is constructed at least in part of a piezoelectric material. The piezoelectric material is configured to generate a diaphragm voltage in response to sound waves deforming the diaphragm. The diaphragm voltage is at least equal to the gate drive voltage to drive the one or more active switching elements of the rectifier. The voice coil is attached to the diaphragm and configured to generate a voice coil voltage that is less than the gate drive voltage of the one or more active switching elements.
    Type: Application
    Filed: April 15, 2020
    Publication date: October 21, 2021
    Inventors: Steven F Griffin, Daryn D. Kono, Timothy John Paulitz, James Benjamin Turner
  • Publication number: 20210293875
    Abstract: A testing system for monitoring a machine under test is disclosed and includes one or more high frequency sensors configured to generate a sensor signal that is representative of an operating parameter of the machine. The high frequency sensors have a required high frequency sampling rate. The testing system also includes a notification device configured to generate a notification indicating the operating parameter monitored by the high frequency sensors has exceeded a predefined threshold value and a data acquisition control module configured to monitor the high frequency sensors at a first sampling rate. The testing system also includes a monitoring control module in electronic communication with the notification device. The monitoring control module is configured to monitor the high frequency sensors at a second sampling rate that is greater than the first sampling rate and at least equal to the required high frequency sampling rate.
    Type: Application
    Filed: March 20, 2020
    Publication date: September 23, 2021
    Inventors: Steven F. Griffin, Matthew Scot Stauffer, Matthew Novick, Daryn D. Kono, Kevin P. Moore
  • Patent number: 11118857
    Abstract: A spin-stabilizing assembly is usable with a cylindrical barrel having a longitudinal center axis, a vertical center axis, and a distal end. The assembly includes a gimbal piece, a spinner cage, and a spinner body. A first end of the gimbal piece engages an outer diameter surface of the barrel proximate the distal end. The spinner cage is configured to engage a second end of the gimbal piece, and to pivot with respect thereto about the vertical center axis. The spinner body is disposed radially within the spinner cage and defines multiple axial vanes. The vanes, in response to impingement on the axial vanes of exhaust gases discharged from the distal end of the barrel, rotate the spinner body about the longitudinal center axis. Rotation results in impedance along the vertical center axis which minimizes vertical displacement or motion of the distal end.
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: September 14, 2021
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Jacob A. Lucas, Alexander Klein
  • Publication number: 20210222984
    Abstract: A spin-stabilizing assembly is usable with a cylindrical barrel having a longitudinal center axis, a vertical center axis, and a distal end. The assembly includes a gimbal piece, a spinner cage, and a spinner body. A first end of the gimbal piece engages an outer diameter surface of the barrel proximate the distal end. The spinner cage is configured to engage a second end of the gimbal piece, and to pivot with respect thereto about the vertical center axis. The spinner body is disposed radially within the spinner cage and defines multiple axial vanes. The vanes, in response to impingement on the axial vanes of exhaust gases discharged from the distal end of the barrel, rotate the spinner body about the longitudinal center axis. Rotation results in impedance along the vertical center axis which minimizes vertical displacement or motion of the distal end.
    Type: Application
    Filed: January 22, 2020
    Publication date: July 22, 2021
    Applicant: The Boeing Company
    Inventors: Steven F. Griffin, Jacob A. Lucas, Alexander Klein
  • Patent number: 11002221
    Abstract: An acoustic cavity tailored synthetic jet employs a body having a cavity with a wall including a taper from a first extent to an aperture. The cavity is configured to produce a matched acoustic resonance. A drive system has a piston engaged to the cavity at the first extent. The drive system and piston are configured for oscillatory motion inducing a synthetic jet at the aperture.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: May 11, 2021
    Assignee: The Boeing Company
    Inventor: Steven F. Griffin
  • Publication number: 20210097720
    Abstract: A method for visual signal processing of a signal includes subdividing a signal, by a signal processor, into a selected number (n) of sets of data. The method also includes assembling the signal, by the signal processor, into an image. The image includes a matrix. The matrix includes a plurality of cells in a predetermined number (m) of columns and the selected number (n) of rows. Each cell of the matrix includes a particular color corresponding to an amplitude of a sample of the signal represented by the cell. The method also includes analyzing the image, by the signal processor, using an image detection algorithm to determine frequency information of the signal.
    Type: Application
    Filed: October 1, 2019
    Publication date: April 1, 2021
    Inventor: Steven F. Griffin
  • Publication number: 20210009260
    Abstract: Embodiments herein describe mitigating flexible modes in an airframe of an aircraft by operating a battery for the aircraft as a tuned mass damper. One embodiment comprises an Unmanned Aerial Vehicle (UAV). The UAV includes a flexible airframe, a plurality of propulsors coupled to the flexible airframe that generate thrust for the UAV, a battery that provides electrical power for the plurality of propulsors, and a suspension system that suspends the battery from the flexible airframe and operates the mass of the battery as a tuned mass damper to dampen flexible modes generated in the flexible airframe during flight.
    Type: Application
    Filed: July 11, 2019
    Publication date: January 14, 2021
    Inventors: Steven F. Griffin, Robert J. Atmur, Adam R. Weston
  • Patent number: 10891934
    Abstract: Described are methods and systems for broad-band active reduction of noise in target spaces, such as spaces around headrests in aircraft cabins. Systems describe herein are effective over wide frequency ranges without causing undesirable amplification at any subrange ranges. Specifically, a system comprises a speaker and a resonator, both coupled to an enclosure. The interior space of the resonator is in fluid communication with the enclosed space of the enclosure, allowing the resonator to reduce the amplitude of unwanted amplification by the audio reducing sound generated by the speaker. The amplitude is reduced in a selected frequency range, which may correspond to an expected amplification for this particular system. The resonator may partially extend into the enclosure or may be completely incorporated into the enclosure. Some examples of the resonator include a Helmholtz resonator, a passive radiator, a quarter wave resonator, a pipe resonator, and an acoustic metamaterial.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: January 12, 2021
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Adam R. Weston, Mark M. Gmerek
  • Patent number: 10801574
    Abstract: A vibration damping system employs a component having a directionally sensitive element thereon, mounted to an aircraft, which experiences dynamic excitation that induces bending deflection in the component that will reorient the directionally sensitive element. At least one tuned mass damper is mounted on the component in an orientation in which an internal mass of the tuned mass damper is moveable such that the tuned massed damper absorbs and attenuates at least a portion of the deflective motion, to thereby suppress bending deflection of the component in the particular axial direction and generally maintain the linearity of the directionally sensitive element.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: October 13, 2020
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Guy D. Granger
  • Patent number: 10655655
    Abstract: A synthetic jet actuator and a method for optimizing a synthetic jet actuator to meet operating requirements and physical constraints may include estimating dimension and a resonance frequency of an air cavity of the synthetic jet actuator, and using the estimated resonance frequency to the estimate dimensions of a piezoelectric actuator of the synthetic jet actuator. Individual simulations of the air cavity and piezoelectric actuator, and a coupled simulation may be performed using the estimated dimensions, and the dimensions may be revised and simulations re-executed to match the resonance frequencies of the air chamber and the piezoelectric actuator. The method maybe yield a synthetic jet actuator having a resonance frequency of the piezoelectric actuator that is approximately equal to a quarter-wavelength resonance frequency of the air cavity.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: May 19, 2020
    Assignee: The Boeing Company
    Inventors: Edward A. Whalen, Steven F. Griffin, Marthinus Cornelius van Schoor, Conor Clery
  • Publication number: 20200051543
    Abstract: Described are methods and systems for broad-band active reduction of noise in target spaces, such as spaces around headrests in aircraft cabins. Systems describe herein are effective over wide frequency ranges without causing undesirable amplification at any subrange ranges. Specifically, a system comprises a speaker and a resonator, both coupled to an enclosure. The interior space of the resonator is in fluid communication with the enclosed space of the enclosure, allowing the resonator to reduce the amplitude of unwanted amplification by the audio reducing sound generated by the speaker. The amplitude is reduced in a selected frequency range, which may correspond to an expected amplification for this particular system. The resonator may partially extend into the enclosure or may be completely incorporated into the enclosure. Some examples of the resonator include a Helmholtz resonator, a passive radiator, a quarter wave resonator, a pipe resonator, and an acoustic metamaterial.
    Type: Application
    Filed: October 18, 2019
    Publication date: February 13, 2020
    Applicant: The Boeing Company
    Inventors: Steven F. Griffin, Adam R. Weston, Mark M. Gmerek
  • Patent number: 10539201
    Abstract: Methods of damping vibrations in a host structure are described. In one embodiment, the vibrations can be damped using a tuned mass damper. The tuned mass damper can include a suspended mass with magnets which is configured to move in response to current being applied to a voice coil. The tuned mass damper can damp vibrations resulting from an external load applied to the host structure, such as an external aerodynamic load. In one embodiment, the tuned mass damper can be mounted within a wind tunnel model undergoing transonic testing. The tuned mass damper can be operated to limit potentially destructive vibrations which can occur during testing.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: January 21, 2020
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Stefan P. Hovik
  • Patent number: 10500602
    Abstract: An active flow control drag-induced damping reduction apparatus. The apparatus includes a variable frequency signal power supply; a jet generator defining an internal cavity and having pump member, and coupled to the variable frequency signal power supply to receive a control signal; a feedback sensor coupled to the pump member to generate a feedback signal measuring the reciprocating motion of the pump member; a detection circuit that receives the feedback signal and measures a difference compared to the variable frequency generator; and an adjustment circuit that receives the measured difference and tunes the variable frequency signal of the variable frequency signal power supply to maintain the jet generator at an optimum flow.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: December 10, 2019
    Assignee: The Boeing Company
    Inventor: Steven F. Griffin
  • Patent number: 10453438
    Abstract: Described are methods and systems for broad-band active reduction of noise in target spaces, such as spaces around headrests in aircraft cabins. Systems describe herein are effective over wide frequency ranges without causing undesirable amplification at any subrange ranges. Specifically, a system comprises a speaker and a resonator, both coupled to an enclosure. The interior space of the resonator is in fluid communication with the enclosed space of the enclosure, allowing the resonator to reduce the amplitude of unwanted amplification by the audio reducing sound generated by the speaker. The amplitude is reduced in a selected frequency range, which may correspond to an expected amplification for this particular system. The resonator may partially extend into the enclosure or may be completely incorporated into the enclosure. Some examples of the resonator include a Helmholtz resonator, a passive radiator, a quarter wave resonator, a pipe resonator, and an acoustic metamaterial.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: October 22, 2019
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Adam R. Weston, Mark M. Gmerek
  • Patent number: 10422625
    Abstract: A modular interferometric telescope including a base and an optical detector. A mounting beam has a first end, a second end, and a length, and is connected rotatably to the base at a point between the first and second end. The mounting beam is rotatable about a first axis extending in a direction of an object to be observed. A first light-collecting assembly is connected to the mounting beam proximal to the first end relative to the second end. The first light-collecting assembly directs light from the object to the optical detector. A second light-collecting assembly connected to the mounting beam is proximal to the second end relative to the first end. The second light-collecting assembly directs the light from the object to the optical detector. A first optical assembly is configured to receive the light from the object and direct the light to the optical detector.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: September 24, 2019
    Assignee: The Boeing Company
    Inventors: David Roderick Gerwe, Steven F. Griffin
  • Patent number: 10364860
    Abstract: Systems and methods for dampening dynamic loading between two bodies are described. An example dampening system includes a non-ferrous metal body attached to a second body and a stack of magnets attached to a third body. The stack of magnets is movably disposed within or around the non-ferrous metal body, and adjacent magnets are arranged in an opposed polar relationship, whereby relative movement of said second and third bodies is damped. An example method of dampening dynamic loading includes arranging a plurality of magnets along an axis to form at least one pair of magnets having an opposed polar relationship along the axis. The method further includes axially moving the at least one pair of magnets relative to a non-ferrous metal body, so as to dampen dynamic loading of a payload attached to a vehicle.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: July 30, 2019
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Richard W. Aston, Jazzmin P. Martinez, Michael John Langmack, Christopher R. Shurilla
  • Publication number: 20190178325
    Abstract: Systems and methods for dampening dynamic loading between two bodies are described. An example dampening system includes a non-ferrous metal body attached to a second body and a stack of magnets attached to a third body. The stack of magnets is movably disposed within or around the non-ferrous metal body, and adjacent magnets are arranged in an opposed polar relationship, whereby relative movement of said second and third bodies is damped. An example method of dampening dynamic loading includes arranging a plurality of magnets along an axis to form at least one pair of magnets having an opposed polar relationship along the axis. The method further includes axially moving the at least one pair of magnets relative to a non-ferrous metal body, so as to dampen dynamic loading of a payload attached to a vehicle.
    Type: Application
    Filed: December 8, 2017
    Publication date: June 13, 2019
    Inventors: Steven F. Griffin, Richard W. Aston, Jazzmin P. Martinez, Michael John Langmack, Christopher R. Shurilla
  • Publication number: 20190145481
    Abstract: Methods of damping vibrations in a host structure are described. In one embodiment, the vibrations can be damped using a tuned mass damper. The tuned mass damper can include a suspended mass with magnets which is configured to move in response to current being applied to a voice coil. The tuned mass damper can damp vibrations resulting from an external load applied to the host structure, such as an external aerodynamic load. In one embodiment, the tuned mass damper can be mounted within a wind tunnel model undergoing transonic testing. The tuned mass damper can be operated to limit potentially destructive vibrations which can occur during testing.
    Type: Application
    Filed: November 13, 2017
    Publication date: May 16, 2019
    Applicant: The Boeing Company
    Inventors: Steven F. Griffin, Stefan P. Hovik
  • Publication number: 20190024608
    Abstract: An acoustic cavity tailored synthetic jet employs a body having a cavity with a wall including a taper from a first extent to an aperture. The cavity is configured to produce a matched acoustic resonance. A drive system has a piston engaged to the cavity at the first extent. The drive system and piston are configured for oscillatory motion inducing a synthetic jet at the aperture.
    Type: Application
    Filed: July 19, 2017
    Publication date: January 24, 2019
    Inventor: Steven F. Griffin
  • Patent number: 10153420
    Abstract: A strain amplification structure has a frame with a hexagonal structure incorporating a plurality of rigid beams that are connected to opposing end beams by a plurality of flexible joints. A piezoceramic actuator assembly is connected to the opposing end beams having a collar including an opening. A shaft providing an output is connected to the plurality of rigid beams with flexible joints and passes through the opening in the collar for non-interfering motion orthogonal to the actuator assembly.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: December 11, 2018
    Assignee: The Boeing Company
    Inventors: Steven F. Griffin, Shawn Haar