Patents by Inventor Ravi Rajamani
Ravi Rajamani 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: 11353861Abstract: A method, system, and non-transitory computer readable medium describing an autoencoder that creates a reduced feature space from healthy power electronics devices for training. Devices under test are then encoded and compared to the encoded features of the healthy devices to determine health of the other devices. Contextual information is used to build multiple models that compare power electronics devices from similarly operated vehicles with one another.Type: GrantFiled: May 4, 2020Date of Patent: June 7, 2022Assignees: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., UNIVERSITY OF CONNECTICUTInventors: Shailesh N. Joshi, Donald Mcmenemy, John Kaminski, Ravi Rajamani, Muhamed Farooq, Krishna Pattipati, Ali Bazzi
-
Publication number: 20210341911Abstract: A method, system, and non-transitory computer readable medium describing an autoencoder that creates a reduced feature space from healthy power electronics devices for training. Devices under test are then encoded and compared to the encoded features of the healthy devices to determine health of the other devices. Contextual information is used to build multiple models that compare power electronics devices from similarly operated vehicles with one another.Type: ApplicationFiled: May 4, 2020Publication date: November 4, 2021Applicants: TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., UNIVERSITY OF CONNECTICUTInventors: Shailesh N. JOSHI, Donald MCMENEMY, John KAMINSKI, Ravi RAJAMANI, Muhamed FAROOQ, Krishna PATTIPATI, Ali BAZZI
-
Patent number: 10787156Abstract: A method of diagnosis and prognosis for various operative systems is provided so that maintenance can be efficiently and effectively scheduled and provided. The invention is applicable to a broad range of systems, but particularly to aircraft brake systems and tires. An aircraft brake may be modeled by attributing brake wear factor values to various parameters associated with the aircraft brake that impact wear. Over the course of time and during braking events, the brake wear factor values are summed and a running total of that sum is kept over the life of the brake. At a point in time when the sum of weighted factors exceeds a preset threshold, an indicia is generated that service is required.Type: GrantFiled: October 6, 2016Date of Patent: September 29, 2020Assignee: Meggitt Aircraft Braking System CorporationInventors: Robert T. Dirgo, Ravi Rajamani, Kurt Burkhalter, Joshua H. Adams, Douglas D. Moseley, Kyle J. Hamblin
-
Publication number: 20180290639Abstract: A method of diagnosis and prognosis for various operative systems is provided so that maintenance can be efficiently and effectively scheduled and provided. The invention is applicable to a broad range of systems, but particularly to aircraft brake systems and tires. An aircraft brake may be modeled by attributing brake wear factor values to various parameters associated with the aircraft brake that impact wear. Over the course of time and during braking events, the brake wear factor values are summed and a running total of that sum is kept over the life of the brake. At a point in time when the sum of weighted factors exceeds a preset threshold, an indicia is generated that service is required.Type: ApplicationFiled: October 6, 2016Publication date: October 11, 2018Inventors: Robert T. Dirgo, Ravi Rajamani, Kurt Burkhalter, Joshua H. Adams, Douglas D. Moseley, Kyle J. Hamblin (Deceased)
-
Patent number: 9010198Abstract: An example aircraft debris monitoring sensor assembly includes an aircraft conduit defining a hollow core passage extending axially from an inlet opening to an outlet opening. A sensor arrangement detects debris carried by a fluid within the hollow core passage.Type: GrantFiled: July 29, 2011Date of Patent: April 21, 2015Assignee: United Technologies CorporationInventors: Ravi Rajamani, Alexander I. Khibnik, William Donat, Rajendra K. Agrawal
-
Patent number: 8862433Abstract: An example method of partitioning turbomachine faults includes using a modeling computer to model a system, to establish a modeled gas path parameter, and to establish a modeled subsystem parameter. The method then determines a gas path condition representing a difference between an actual gas path parameter and the modeled gas path parameter. The method also determines a subsystem condition representing a difference between an actual subsystem parameter and the modeled subsystem parameter. The method diagnoses a sensor failure based on the gas path condition and the subsystem condition.Type: GrantFiled: May 18, 2010Date of Patent: October 14, 2014Assignee: United Technologies CorporationInventors: Sampath K. Yerramalla, William Donat, Ravi Rajamani
-
Patent number: 8459103Abstract: A method for operating a debris monitoring system comprises continuously sensing the passage of particulates through a gas turbine engine to produce a time-domain sensor signal. The time-domain sensor signal is Fourier transformed to produce a frequency domain sensor signal. The frequency domain sensor signal is partitioned into bins corresponding to particulate composition categories. At least one feature is identified within each bin, and is used to determine the amount of particulate flow in each particulate composition category.Type: GrantFiled: June 24, 2011Date of Patent: June 11, 2013Assignee: United Technologies CorporationInventors: Alexander I. Khibnik, Ravi Rajamani, Coy Bruce Wood, Rajendra K. Agrawal, William Donat
-
Patent number: 8424279Abstract: A gas turbine engine system includes an air inlet, an inlet particle separator located at the air inlet and having a blower selectively driven by a variable output motor, and a controller for dynamically controlling the variable output motor that selectively drives the blower of the inlet particle separator.Type: GrantFiled: March 28, 2007Date of Patent: April 23, 2013Assignee: United Technologies CorporationInventors: Ravi Rajamani, Rajendra K. Agrawal, Coy Bruce Wood
-
Patent number: 8396571Abstract: A process for optimizing maintenance work schedules for at least one engine includes the steps of retrieving at least one set of data for an engine from a computer readable storage medium; selecting at least one scheduling parameter for the engine; selecting a set of maintenance rules for the engine; selecting at least one maintenance work decision; selecting at least one objective for the engine; optimizing the at least one objective to generate at least one optimal maintenance work decision; and generating at least one optimal maintenance work schedule for the engine.Type: GrantFiled: March 19, 2007Date of Patent: March 12, 2013Assignee: United Technologies CorporationInventors: Sorin Costiner, Howard A. Winston, Jihua Wang, Alexander I. Khibnik, Ravi Rajamani, Thomas R. Matthis, Ricardo A. Benitez, Julie A. Ireland, Ellen Cohen
-
Publication number: 20130025348Abstract: An example aircraft debris monitoring sensor assembly includes an aircraft conduit defining a hollow core passage extending axially from an inlet opening to an outlet opening. A sensor arrangement detects debris carried by a fluid within the hollow core passage.Type: ApplicationFiled: July 29, 2011Publication date: January 31, 2013Inventors: Ravi Rajamani, Alexander I. Khibnik, William Donat, Rajendra K. Agrawal
-
Publication number: 20120324987Abstract: A method for operating a debris monitoring system comprises continuously sensing the passage of particulates through a gas turbine engine to produce a time-domain sensor signal. The time-domain sensor signal is Fourier transformed to produce a frequency domain sensor signal. The frequency domain sensor signal is partitioned into bins corresponding to particulate composition categories. At least one feature is identified within each bin, and is used to determine the amount of particulate flow in each particulate composition category.Type: ApplicationFiled: June 24, 2011Publication date: December 27, 2012Applicant: United Technologies CorporationInventors: Alexander I. Khibnik, Ravi Rajamani, Coy Bruce Wood, Rajendra K. Agrawal, William Donat
-
Patent number: 8256277Abstract: An example method of controlling gas turbine engine debris monitoring sensors includes detecting debris carried by air moving through an engine using at least first and second debris sensors, and processing signals from both the first and second debris sensors using a common signal conditioning unit. Another example method of monitoring gas turbine engine debris includes configuring at least one first debris sensor to detect debris carried by airflow moving through a first portion of an engine and configuring at least one second debris sensor to detect debris carried by airflow moving though a second portion of the engine. The method alternates between using the first debris sensor to detect debris and using the second debris sensor to detect debris.Type: GrantFiled: June 11, 2009Date of Patent: September 4, 2012Assignee: United Technologies CorporationInventors: Alexander I. Khibnik, Ravi Rajamani, Rajendra K. Agrawal, Coy Bruce Wood
-
Patent number: 8204671Abstract: An example method of estimating gas turbine engine performance deterioration includes monitoring debris in at least a portion of an engine and estimating performance deterioration of at least one component of the engine using information from the monitoring. The method may use gas path parameters, such as pressures, temperatures, and speeds to establish the estimated performance deterioration. An example gas turbine engine performance assessment system includes a debris monitoring system configured to monitor debris moving through a portion of an engine and a controller programmed to estimate performance deterioration of at least one component of the engine based on information from the debris monitoring system.Type: GrantFiled: May 18, 2009Date of Patent: June 19, 2012Assignee: United Technologies CorporationInventors: Rajendra K. Agrawal, Ravi Rajamani, William F. Schneider, Coy Bruce Wood
-
Patent number: 8074498Abstract: An example method of assessing a component of a gas turbine engine includes monitoring debris in at least a portion of an engine and establishing an estimated thermal energy level for a component of the engine based on the monitoring. The method may use gas path parameters to establish the estimated thermal energy level. An example gas turbine engine component assessment system includes a debris monitoring system configured to monitor debris moving through a portion of an engine and a controller programmed to execute an engine deterioration model that assesses a thermal energy level of at least one component of the engine based on information from the debris monitoring system.Type: GrantFiled: May 18, 2009Date of Patent: December 13, 2011Assignee: United Technologies CorporationInventors: Rajendra K. Agrawal, Ravi Rajamani, William F. Schneider, Coy Bruce Wood
-
Publication number: 20110286831Abstract: An example method of partitioning turbomachine faults includes using a modeling computer to model a system, to establish a modeled gas path parameter, and to establish a modeled subsystem parameter. The method then determines a gas path condition representing a difference between an actual gas path parameter and the modeled gas path parameter. The method also determines a subsystem condition representing a difference between an actual subsystem parameter and the modeled subsystem parameter. The method diagnoses a sensor failure based on the gas path condition and the subsystem condition.Type: ApplicationFiled: May 18, 2010Publication date: November 24, 2011Inventors: Sampath K. YERRAMALLA, William DONAT, Ravi RAJAMANI
-
Publication number: 20110179763Abstract: A gas turbine engine system includes an air inlet, an inlet particle separator located at the air inlet and having a blower selectively driven by a variable output motor, and a controller for dynamically controlling the variable output motor that selectively drives the blower of the inlet particle separator.Type: ApplicationFiled: March 28, 2007Publication date: July 28, 2011Applicant: United Technologies CorporationInventors: Ravi Rajamani, Rajendra K. Agrawal, Coy Bruce Wood
-
Patent number: 7927067Abstract: A variable vane control system for use with a gas turbine engine includes a plurality of vanes, an actuation assembly, a mechanical linkage assembly, and a sensor. Each of the plurality of vanes has an airfoil portion disposed in a gas flowpath of the gas turbine engine, and a position of each of the vanes is adjustable with respect to an angle of attack of the airfoil portion of each vane. The actuation assembly is configured for generating actuation force to position the plurality of vanes. The mechanical linkage assembly operably connects the actuation assembly to at least one of the plurality of vanes. The sensor is configured to sense at least one of the position of the airfoil portions of the plurality of vanes and the mechanical linkage assembly, and to generate a position output signal.Type: GrantFiled: May 1, 2007Date of Patent: April 19, 2011Assignee: United Technologies CorporationInventors: Ravi Rajamani, Peter E. Chenard, Coy Bruce Wood
-
Patent number: 7881880Abstract: A method for monitoring performance of an actuator is provided that includes the steps of: 1) determining an actuator response time constant in a control system, which actuator response time constant is representative of a task time taken by the actuator to complete a selected percentage of a task; 2) determining a rate of change of the actuator response time constant over a predetermined number of events; 3) determining a fault value indicative of when the actuator response time constant will equal or exceed an error time constant using the determined rate of change of the actuator response time constant; and 4) outputting a signal from the control system representative of the determined fault value.Type: GrantFiled: April 1, 2009Date of Patent: February 1, 2011Assignee: United Technologies CorporationInventors: Ravi Rajamani, Allan J. Volponi
-
Publication number: 20100313639Abstract: An example method of controlling gas turbine engine debris monitoring sensors includes detecting debris carried by air moving through an engine using at least first and second debris sensors, and processing signals from both the first and second debris sensors using a common signal conditioning unit. Another example method of monitoring gas turbine engine debris includes configuring at least one first debris sensor to detect debris carried by airflow moving through a first portion of an engine and configuring at least one second debris sensor to detect debris carried by airflow moving though a second portion of the engine. The method alternates between using the first debris sensor to detect debris and using the second debris sensor to detect debris.Type: ApplicationFiled: June 11, 2009Publication date: December 16, 2010Inventors: Alexander I. Khibnik, Ravi Rajamani, Rajendra K. Agrawal, Coy Bruce Wood
-
Patent number: 7853441Abstract: Systems and methods involving engine models are provided. A representative method for updating a gas turbine engine reference model includes: determining whether an absolute difference between a dominant time constant of a sensor and an assumed sensor model time constant is outside a tolerance value; and responsive to determining that the absolute difference is outside the tolerance value, updating the assumed sensor model time constant with the dominant time constant of the sensor.Type: GrantFiled: August 22, 2007Date of Patent: December 14, 2010Assignee: United Technologies Corp.Inventors: Allan J. Volponi, Ravi Rajamani, Frederick A. Just-Agosto, David Serrano