Patents by Inventor George G. Zipfel
George G. Zipfel 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).
-
Patent number: 11430939Abstract: Exemplary practice of the present invention provides a magnetostrictive actuator characterized by linear force output and uniform magnetic biasing. A center bias magnet drives flux through series magnetostrictive bars in opposite directions while surrounding drive coils apply flux in the same direction through the bars. The net response is substantially linear with respect to the drive coil current. A second parallel set of magnetostrictive bars completes the flux path and adds to the actuator output force. Flux leakage between the parallel bars is compensated by a ferromagnetic shunt or by a tapered magnet providing uniform flux density down the length of the magnetostrictive bars. The closed flux path allows magnetic shielding of the entire actuator, if desired.Type: GrantFiled: March 19, 2021Date of Patent: August 30, 2022Assignee: The United States of America, as represented by the Secretary of the NavyInventors: John E. Miesner, George G. Zipfel, Jr.
-
Patent number: 10998487Abstract: Exemplary practice of the present invention provides a magnetostrictive actuator characterized by linear force output and uniform magnetic biasing. A center bias magnet drives flux through series magnetostrictive bars in opposite directions while surrounding drive coils apply flux in the same direction through the bars. The net response is substantially linear with respect to the drive coil current. A second parallel set of magnetostrictive bars completes the flux path and adds to the actuator output force. Flux leakage between the parallel bars is compensated by a ferromagnetic shunt or by a tapered magnet providing uniform flux density down the length of the magnetostrictive bars. The closed flux path allows magnetic shielding of the entire actuator, if desired.Type: GrantFiled: September 20, 2018Date of Patent: May 4, 2021Assignee: The United States of America, as represented by the Secretary of the NavyInventors: John E. Miesner, George G. Zipfel, Jr.
-
Publication number: 20040140149Abstract: A passive device is provided for reducing vibration and noise in a hydraulic system. The passive device includes a tubular element having an open end and a closed end. The open end of the tubular element is adapted to be attached to a fluid conduit carrying pressurized fluid in the system so that the tube fills with the pressurized fluid. The area and length of the tube are such that the fluid within the tube has a resonant condition at a frequency that is the same as at least one frequency of the vibration and noise that is to be reduced or removed in the hydraulic system. A helicopter is also provided having a hydraulic system of pressurized fluid for reducing the transfer of vibrations from the transmission to the airframe including the passive device. Several such passive devices may be applied at selected locations in a hydraulic system for effectively reducing high frequency vibration and noise due to, for example, helicopter transmission gear clashing.Type: ApplicationFiled: January 9, 2004Publication date: July 22, 2004Inventors: Gregory Weston Terpay, George G. Zipfel
-
Patent number: 6644590Abstract: An active mount is provided for use in a rotary wing aircraft between each of the gearbox and airframe mounting locations for mechanically suspending the airframe from the gearbox. The active mount comprises first and second linear hydraulic actuators each having a principal axis. The length of the actuators is variable along the principal axis for providing relative movement between the airframe and the gearbox. The principal axes of the actuators are adapted to lie in the directional planes of the primary forces necessary for supporting the airframe and acting on the transmission gearbox mounting locations for providing movement of the gearbox relative to the airframe in the planes at a frequency for reducing the transfer of vibration through the active mount to the airframe. A system for reducing vibration in the rotary wing aircraft further comprises a hydraulic system for supplying a controlled flow of pressurized hydraulic fluid to the actuators.Type: GrantFiled: September 14, 2001Date of Patent: November 11, 2003Assignee: General Dynamics Advanced Information Systems, Inc.Inventors: Gregory Weston Terpay, George G. Zipfel, William Welsh
-
Publication number: 20020128072Abstract: An active mount is provided for use in a rotary wing aircraft between each of the gearbox and airframe mounting locations for mechanically suspending the airframe from the gearbox. The active mount comprises first and second linear hydraulic actuators each having a principal axis. The length of the actuators is variable along the principal axis for providing relative movement between the airframe and the gearbox. The principal axes of the actuators are adapted to lie in the directional planes of the primary forces necessary for supporting the airframe and acting on the transmission gearbox mounting locations for providing movement of the gearbox relative to the airframe in the planes at a frequency for reducing the transfer of vibration through the active mount to the airframe. A system for reducing vibration in the rotary wing aircraft further comprises a hydraulic system for supplying a controlled flow of pressurized hydraulic fluid to the actuators.Type: ApplicationFiled: September 14, 2001Publication date: September 12, 2002Inventors: Gregory Weston Terpay, George G. Zipfel, William Welsh
-
Publication number: 20020094274Abstract: A passive device is provided for reducing vibration and noise in a hydraulic system. The passive device includes a tubular element having an open end and a closed end. The open end of the tubular element is adapted to be attached to a fluid conduit carrying pressurized fluid in the system so that the tube fills with the pressurized fluid. The area and length of the tube are such that the fluid within the tube has a resonant condition at a frequency that is the same as at least one frequency of the vibration and noise that is to be reduced or removed in the hydraulic system. A helicopter is also provided having a hydraulic system of pressurized fluid for reducing the transfer of vibrations from the transmission to the airframe including the passive device. Several such passive devices may be applied at selected locations in a hydraulic system for effectively reducing high frequency vibration and noise due to, for example, helicopter transmission gear clashing.Type: ApplicationFiled: September 14, 2001Publication date: July 18, 2002Inventors: Gregory Weston Terpay, George G. Zipfel
-
Patent number: 5949162Abstract: In many uses of electrical motors, the interaction of a tool being powered, e.g., a milling machine, and the workpiece being worked on by the motor induces mechanical vibrations which adversely affect the functioning of the tool as well as inducing wear producing vibrations in the motor rotor shaft. Damping of such vibrations is achieved by deliberately inducing internal unbalanced forces on the motor rotor shaft for counteracting the externally induced vibrations. Such internal unbalanced forces are produced by the use of additional currents in the main stator coils for generating additional, unbalanced force generating magnetic fields. A mathematical analysis of the process is provided.Type: GrantFiled: December 13, 1996Date of Patent: September 7, 1999Assignee: General Dynamics Advanced Technology Systems, Inc.Inventors: Victor G. Mishkevich, Gregory Weston Terpay, George G. Zipfel, Jr.
-
Patent number: 5596413Abstract: Through-the-lens alignment during deep UV lithographic processing in the manufacture of VLSI is accomplished without shifting the mask or wafer from the exposure position. Introduction and extraction of alignment light of actinic wavelength depends on beam routing due to diffraction from an interference grating. The path of alignment light is within the focusing system but does not impinge on the focused pattern.Type: GrantFiled: August 17, 1995Date of Patent: January 21, 1997Assignee: Lucent Technologies Inc.Inventors: Stuart Stanton, Donald L. White, George G. Zipfel, Jr.
-
Patent number: 5493165Abstract: This disclosure describes a method for producing high-performance layered-element electrostrictive or piezoelectric actuators, and the resulting product. The process calls for steps that minimize decreases of the stack stiffness which usually characterize layered wafer actuators. These include making the wafers flat and parallel, using a referred wafer metalization process that does not affect wafer surface roughness, and using stock-bonding epoxies with viscosities which readily permit the bonding agent to "wick" into the interface areas of the wafer/electrode stacks thereby to minimize the bond agent thickness.Type: GrantFiled: November 4, 1994Date of Patent: February 20, 1996Assignee: AT&T Corp.Inventors: Thomas E. Smith, Robert Zappulla, George G. Zipfel, Jr.
-
Patent number: 5438627Abstract: Disclosed is an electrodynamic moving coil actuator comprising one or more separate coils contained in interior spaces of a reactance mass. The coils are oriented in closely spaced parallel zones within the interior spaces. The spaces are formed and positioned to be outside of the static magnetic flux lines of the reactance mass. The static flux thus is substantially de-coupled from the dynamic magnetic field of the coil. Magnetic flux choke points are avoided, but at the same time, high volumetric efficiency is achieved. Each coil is attached to supports along its two long outer edges. The supports are connected to each other at their extremities by top and bottom plates which are connected by slide bars that also serve as tie rods. The reactance mass is mounted on the slide bars. The design is adapted to low frequency, high force applications such as active noise control automotive mufflers.Type: GrantFiled: December 30, 1992Date of Patent: August 1, 1995Assignee: AT&T Corp.Inventors: Thomas E. Smith, Gregory W. Terpay, George G. Zipfel, Jr.
-
Patent number: 4407054Abstract: A method of making flexible composite piezoelectric materials exhibiting hydrostatic response and having a stable response over time is given. A prepolymer material is combined with a piezoelectric material and polarized by applying an electric field while inducing an electric dipole in the piezoelectric material, typically by applying hydrostatic pressure or changing the temperature. To ensure stable response characteristics, the polymer material is chosen to have a shear modulus of less than 20 pounds per square inch. To help ensure good contact between the piezoelectric material and the polymer material, controlled shrinkage may be induced in the composite materials by heat or the removal of a volatile material. The prepolymer material desirably has an electrical resistivity greater than 10.sup.10 ohm/meters. Typical piezoelectric materials include lithium sulfate and tartaric acid. Typical polymer materials include RTV rubber, urethanes, and polybutadienes, and may be in the form of oligomers.Type: GrantFiled: October 28, 1980Date of Patent: October 4, 1983Assignee: Bell Telephone Laboratories, IncorporatedInventor: George G. Zipfel, Jr.