Patents by Inventor Link C. Jaw

Link C. Jaw 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: 20110307743
    Abstract: A method for reducing false alarms in a monitoring system comprising the steps of: providing an initial fault set (or a preliminary fault set) and using a decision process to successively reduce this initial fault set to a fault ensemble, said decision process using increasing probability or confidence in the initial fault set to generate the fault ensemble, which is considered to reflect a true abnormal condition; the decision process comprising at least two steps: the first step is generating a preliminary fault set by using a standard anomaly detection method with the additional variable (or adaptive) thresholds or temporal filters; the second step is using the preliminary fault set to generate at least one fault ensemble, each of which comprises a reduced number of refined faults that represent a more confident explanation of the cause(s) of an abnormal condition.
    Type: Application
    Filed: June 11, 2010
    Publication date: December 15, 2011
    Inventors: Asif Khalak, Link C. Jaw
  • Patent number: 6898554
    Abstract: A method for detecting a fault in a physical system uses a model of the physical system and calculates estimated dependent variables or conditions for the system using substantially only independent variables that are measured from the system using hardware redundancy or selected based on their better measurement reliability. An example of hardware redundancy is to measure an independent variable using two or more sensors rather than one. The estimated dependent variables are compared to the corresponding measured dependent variable conditions to calculate residuals, which are then analyzed using appropriate fault detection techniques. The method is especially effective relative to prior fault detection method when used to detect anomalies or unknown fault states of the system.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: May 24, 2005
    Assignee: Scientific Monitoring, Inc.
    Inventors: Link C. Jaw, Dong-Nan Wu
  • Patent number: 6871160
    Abstract: Health management of machines, such as gas turbine engines and industrial equipment, offers the potential benefits of efficient operations and reduced cost of ownership. Machine health management goes beyond monitoring operating conditions, it assimilates available information and makes the most favorable decisions to maximize the value of the machine. These decisions are usually related to predicted failure modes and their corresponding failure time, recommended corrective actions, repair/maintenance actions, and planning and scheduling options. Hence machine health management provides a number of functions that are interconnected and cooperative to form a comprehensive health management system. While these interconnected functions may have different names (or terminology) in different industries, an effective health management system should include four primary functions: sensory input processing, fault identification, failure/life prediction, planning and scheduling.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: March 22, 2005
    Assignee: Scientific Monitoring Inc.
    Inventor: Link C. Jaw
  • Publication number: 20040049715
    Abstract: Health management of machines, such as gas turbine engines and industrial equipment, offers the potential benefits of efficient operations and reduced cost of ownership. Machine health management goes beyond monitoring operating conditions, it assimilates available information and makes the most favorable decisions to maximize the value of the machine. These decisions are usually related to predicted failure modes and their corresponding failure time, recommended corrective actions, repair/maintenance actions, and planning and scheduling options. Hence machine health management provides a number of functions that are interconnected and cooperative to form a comprehensive health management system. While these interconnected functions may have different names (or terminology) in different industries, an effective health management system should include four primary functions: sensory input processing, fault identification, failure/life prediction, planning and scheduling.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 11, 2004
    Inventor: Link C. Jaw
  • Publication number: 20030176954
    Abstract: Described herein are damage control mechanisms and methods to extend the on-wing life of critical gas turbine engine components. Particularly, two types of damage mechanisms are addressed: creep/rupture and thermo-mechanical fatigue. To control these damages and extend the life of engine hot-section components, two methodologies are implemented as additional control logic for the on-board electronic control unit. This new logic, the life-extending control (LEC), interacts with the engine control and monitoring unit and modifies the fuel flow to reduce component damages in a flight mission. The LEC methodologies were demonstrated in a real-time, hardware-in-the-loop simulation. The results show that LEC is not only a new paradigm or engine control design, but also a promising technology for extending the service life of engine components, hence reducing the life cycle cost of the engine.
    Type: Application
    Filed: October 4, 2002
    Publication date: September 18, 2003
    Inventor: Link C. Jaw
  • Publication number: 20030120402
    Abstract: Health management of machines, such as gas turbine engines and industrial equipment, offers the potential benefits of efficient operations and reduced cost of ownership. Machine health management goes beyond monitoring operating conditions, it assimilates available information and makes the most favorable decisions to maximize the value of the machine. These decisions are usually related to predicted failure modes and their corresponding failure time, recommended corrective actions, repair/maintenance actions, and planning and scheduling options. Hence machine health management provides a number of functions that are interconnected and cooperative to form a comprehensive health management system. While these interconnected functions may have different names (or terminology) in different industries, an effective health management system should include four primary functions: sensory input processing, fault identification, failure/life prediction, planning and scheduling.
    Type: Application
    Filed: September 5, 2002
    Publication date: June 26, 2003
    Inventor: Link C. Jaw
  • Patent number: 6519943
    Abstract: A method for equalizing fluid pressure in a primary fluid flow region, comprised of providing a modulating fluid flow region adjacent to the primary flow region and separating the two regions with a perforated wall. By controlling the fluid pressure in the modulating fluid flow region, and permitting fluid to flow between the perforated wall, the fluid pressure in the primary fluid flow region is equalized. The perforations may be formed either in at least one ring about the perimeter of the plenum or at least one row along the longitudinal direction of the plenum. Furthermore, at least one of the perforations may be canted in either the longitudinal or radial directions. This method is important in equalizing the air pressure in a turbine engine air inlet and thereby avoiding aerodynamic distortions in said inlet. Additionally, an apparatus is provided for equalizing the pressure in a primary fluid flow region.
    Type: Grant
    Filed: August 26, 2002
    Date of Patent: February 18, 2003
    Assignee: Scientific Monitoring Inc.
    Inventor: Link C. Jaw
  • Publication number: 20030005703
    Abstract: A method for equalizing fluid pressure in a primary fluid flow region, comprised of providing a modulating fluid flow region adjacent to the primary flow region and separating the two regions with a perforated wall. By controlling the fluid pressure in the modulating fluid flow region, and permitting fluid to flow between the perforated wall, the fluid pressure in the primary fluid flow region is equalized. The perforations may be formed either in at least one ring about the perimeter of the plenum or at least one row along the longitudinal direction of the plenum. Furthermore, at least one of the perforations may be canted in either the longitudinal or radial directions. This method is important in equalizing the air pressure in a turbine engine air inlet and thereby avoiding aerodynamic distortions in said inlet. Additionally, an apparatus is provided for equalizing the pressure in a primary fluid flow region.
    Type: Application
    Filed: August 26, 2002
    Publication date: January 9, 2003
    Inventor: Link C. Jaw
  • Patent number: 6490543
    Abstract: Lifeometer and general operation algorithm of lifeometer. Optimal base reference life expectancy for the system/part being measured is provided. Lifeometer calculates and displays the rate of usage, the life used, or the life remaining. The information displayed is used by operators or users of the part or machine to make maintenance or service decisions. Lifeometer monitors and tracks/records internal operational parameters, environmental or external operational parameters or outside conditions at or near the system/part, and/or operating history of the system/part. If the system/part is at a life level to be serviced or replaced, then the system/part is serviced or replaced, and the lifeometer resets remaining life level and/or used life level to appropriate values. Lifeometer has a system/part monitor, a digital processor with virtual memory, a database in storage, a display system, and an environmental/outside conditions monitor.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: December 3, 2002
    Assignee: Scientific Monitoring Inc
    Inventor: Link C. Jaw
  • Patent number: 6438960
    Abstract: A method is provided for equalizing fluid pressure in a primary fluid flow region, comprised of providing a modulating fluid flow region adjacent to the primary flow region and separating the two regions with a perforated wall. By controlling the fluid pressure in the modulating fluid flow region, and permitting fluid to flow between the perforated wall, the fluid pressure in the primary fluid flow region is equalized. The perforations may be formed either in at least one ring about the perimeter of the plenum or at least one row along the longitudinal direction of the plenum. Furthermore, at least one of the perforations may be canted in either the longitudinal or radial directions. This method is important in equalizing the air pressure in a turbine engine air inlet and thereby avoiding aerodynamic distortions in said inlet. Additionally, an apparatus is provided for equalizing the pressure in a primary fluid flow region.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: August 27, 2002
    Assignee: Scientific Monitoring, Inc.
    Inventor: Link C. Jaw
  • Publication number: 20020066054
    Abstract: A method for detecting a fault in a physical system uses a model of the physical system and calculates estimated dependent variables or conditions for the system using substantially only independent variables that are measured from the system using hardware redundancy or selected based on their better measurement reliability. An example of hardware redundancy is to measure an independent variable using two or more sensors rather than one. The estimated dependent variables are compared to the corresponding measured dependent variable conditions to calculate residuals, which are then analyzed using appropriate fault detection techniques. The method is especially effective relative to prior fault detection method when used to detect anomalies or unknown fault states of the system.
    Type: Application
    Filed: November 30, 2000
    Publication date: May 30, 2002
    Inventors: Link C. Jaw, Dong-Nan Wu
  • Patent number: 6304784
    Abstract: An improved probing device includes: an elongated, substantially cylindrical flexible fiber having a non-conducting outer surface; one or more circuits disposed on the outer surface of the fiber for simultaneously providing an electrical signal path to and from a plurality of locations, each of the circuits comprising a non-planar integrated circuit extending lengthwise along the outer surface of the fiber; and an insulating layer substantially disposed over the electrical circuits and around the outer surface of the fiber, the insulating layer having a plurality of openings through which selected portions of the electrical circuits are exposed to the locations. Such a probing device when adapted as a neural probe is especially useful for conducting deep brain measurement and stimulation.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: October 16, 2001
    Assignee: Arizona Board of Regents, acting for and on behalf of Arizona State University
    Inventors: David R. Allee, Link C. Jaw
  • Patent number: 5557917
    Abstract: A method is provided for equalizing fluid pressure in a primary fluid flow region, comprised of providing a modulating fluid flow region adjacent to the primary flow region and separating the two regions with a perforated wall. By controlling the fluid pressure in the modulating fluid flow region, and permitting fluid to flow between the perforated wall, the fluid pressure in the primary fluid flow region is equalized. This method is important in equalizing the air pressure in a turbine engine air inlet and thereby avoiding aerodynamic distortions in said inlet. Additionally, an apparatus is provided for equalizing the pressure in a primary fluid flow region.
    Type: Grant
    Filed: September 13, 1994
    Date of Patent: September 24, 1996
    Assignee: Scientific Monitoring, Inc.
    Inventor: Link C. Jaw
  • Patent number: 5485868
    Abstract: A fast-acting high-output valve is provided comprised of a valve body covering an opening, a means for applying a force to the center of said valve, and a means for transforming said force to opposite movement at the periphery of said valve body. As the valve body periphery is moved opposite from the opening covered by the valve body, an annular gap is created through which fluid may flow. When the force to the center of the valve body is eliminated, the valve body periphery drops back into place and the valve closes.
    Type: Grant
    Filed: September 13, 1994
    Date of Patent: January 23, 1996
    Assignee: Scientific Monitoring, Inc.
    Inventors: Link C. Jaw, Frank O. Liu
  • Patent number: 5280702
    Abstract: A gas turbine engine comprised of a gas generator in flow series arrangement with a free turbine is provided, that includes a bleed port disposed between the gas generator and the free turbine. The flow of hot gas through the free turbine is controlled by a valve operably disposed in a duct downstream of the bleed port. The gas turbine engine can rapidly change its power output by first bleeding a portion of the hot gas exiting the gas generator overboard, and then increasing or decreasing the amount of bleed flow, thereby producing rapid changes in the free turbine's output.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: January 25, 1994
    Assignee: Allied-Signal, Inc.
    Inventor: Link C. Jaw
  • Patent number: 5163286
    Abstract: A gas turbine engine comprised of a gas generator in flow series arrangement with a free turbine is provided, that includes a bleed port disposed between the gas generator and the free turbine. The flow of hot gas through the free turbine is controlled by a valve operably disposed in a duct downstream of the bleed port. The gas turbine engine can rapidly change its power output by first bleeding a portion of the hot gas exiting the gas generator overboard, and then increasing or decreasing the amount of bleed flow, thereby producing rapid changes in the free turbine's output.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: November 17, 1992
    Assignee: Allied-Signal Inc.
    Inventor: Link C. Jaw