Michael J Krok

US Patent:

7421162, Sep 2, 2008

Filed:

Mar 22, 2005

Appl. No.:

11/086055

Inventors:

Kevin Thomas McCarthy - Troy NY, US
Kung-Li Justin Deng - Waterford NY, US
Hua Xia - Altamont NY, US
Michael Joseph Krok - Clifton Park NY, US
Avinash Vinayak Taware - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/34
G02B 6/26

US Classification:

385 37, 385 12, 385 13

Abstract:

In accordance with one exemplary embodiment the invention provides a multi-parameter fiber optic sensing system with an aperiodic sapphire fiber grating as sensing element for simultaneous temperature, strain, NO, CO, Oand Hgas detection. The exemplary sensing system includes an aperiodic fiber grating with an alternative refractive index modulation for such multi-function sensing and determination. Fabrication of such quasiperiodic grating structures can be made with point-by-point UV laser inscribing, diamond saw micromachining, and phase mask-based coating and chemical etching methods. In the exemplary embodiment, simultaneous detections on multi-parameter can be distributed, but not limited, in gas/steam turbine exhaust, in combustion and compressor, and in coal fired boilers etc. Advantageously, the mapping of multiple parameters such as temperature, strain, and gas using sapphire aperiodic gratings improves control and optimization of such systems directed to improve efficiency and output and reduce emissions.

US Patent:

7492980, Feb 17, 2009

Filed:

Apr 22, 2008

Appl. No.:

12/107340

Inventors:

Kevin Thomas McCarthy - Troy NY, US
Kung-Li Justin Deng - Waterford NY, US
Hua Xia - Altamont NY, US
Michael Joseph Krok - Clifton Park NY, US
Avinash Vinayak Taware - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/34
G02B 6/26

US Classification:

385 12, 385 13, 385 37

Abstract:

In accordance with one exemplary embodiment the invention provides a multi-parameter fiber optic sensing system with an aperiodic sapphire fiber grating as sensing element for simultaneous temperature, strain, NO, CO, Oand Hgas detection. The exemplary sensing system includes an aperiodic fiber grating with an alternative refractive index modulation for such multi-function sensing and determination. Fabrication of such quasiperiodic grating structures can be made with point-by-point UV laser inscribing, diamond saw micromachining, and phase mask-based coating and chemical etching methods. In the exemplary embodiment, simultaneous detections on multi-parameter can be distributed, but not limited, in gas/steam turbine exhaust, in combustion and compressor, and in coal fired boilers etc. Advantageously, the mapping of multiple parameters such as temperature, strain, and gas using sapphire aperiodic gratings improves control and optimization of such systems directed to improve efficiency and output and reduce emissions.

US Patent:

7596953, Oct 6, 2009

Filed:

Dec 23, 2003

Appl. No.:

10/744617

Inventors:

Michael Joseph Krok - Clifton Park NY, US
Narayanan Venkateswaran - Bangalore, IN
Mallikarjun Shivaraya Kande - Bangalore, IN

Assignee:

General Electric Company - Niskayuna NY

International Classification:

F02C 7/00

US Classification:

60772, 60803, 415118

Abstract:

A method of detecting onset of a gas turbine condition, such as compressor stall, includes receiving data indicative of an operating parameter of a compressor of the gas turbine. The method also includes performing a wavelet transformation on the data to generate wavelet transformed data. The wavelet transformation is configured to affect a processing characteristic regarding a performance of the wavelet transformation. Features indicative of onset of the gas turbine condition in the wavelet transformed data are then identified to provide an indication for controlling the gas turbine to prevent compressor stall from occurring. A system for detecting onset of compressor stall in a gas turbine includes a sensor for providing data indicative of an operating parameter of the compressor and a processor for performing a wavelet transform on the data to identify features of the optimized wavelet transformed data indicative of onset of stall.

US Patent:

7622888, Nov 24, 2009

Filed:

Dec 13, 2005

Appl. No.:

11/301662

Inventors:

Orges Gjini - Clifton Park NY, US
Mark Dame - Niskayuna NY, US
Michael Krok - Clifton Park NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

H01M 10/44
H01M 12/00

US Classification:

320101, 320138, 320139, 136291, 323906

Abstract:

A self-contained regenerative power system includes a fuel cell operative to generate electric energy from hydrogen and oxygen, generating water as a byproduct, and an electrolyzer operative to generate hydrogen and oxygen from water by consumption of electric energy. A bi-directional DC-to-DC converter interfaces between the fuel cell and the electrolyzer on one side and the system to be powered on the other. A switch selectively connects either the fuel cell or the electrolyzer with the bi-directional DC-to-DC converter. The products of the fuel cell process can be supplied to the electrolyzer process, and vice versa. Alternately, the self-contained regenerative power system comprises a unitary fuel cell and electrolyzer.

US Patent:

7650777, Jan 26, 2010

Filed:

Jul 18, 2008

Appl. No.:

12/175889

Inventors:

Michael Joseph Krok - Clifton Park NY, US
John Bolton - Lake Luzerne NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G01M 15/14

US Classification:

7311206, 7311205

Abstract:

A method for monitoring a compressor comprising a rotor is presented. The method comprises obtaining a dynamic pressure signal of the rotor, obtaining a blade passing frequency of the rotor, using the blade passing frequency signal for filtering the dynamic pressure signal, buffering the filtered dynamic pressure signal over a moving window time period, and analyzing the buffered dynamic pressure signal to predict a stall condition of the compressor.

US Patent:

8306373, Nov 6, 2012

Filed:

May 15, 2009

Appl. No.:

12/466442

Inventors:

Hua Xia - Altamont NY, US
Kevin Thomas McCarthy - Troy NY, US
Michael Joseph Krok - Clifton Park NY, US
Boon Kwee Lee - Clifton Park NY, US
Christian Joseph Wagner - Latham NY, US
Ronald Kevin Gilstrap - Easley SC, US
James Richard Nutt - Greer SC, US
Kung-Li Deng - Princeton NJ, US
David Robert O'Connor - Gardnerville NV, US
Juntao Wu - Niskayuna NY, US
James Gerard Lopez - East Schodack NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G02B 6/00
G02B 6/34
G06F 19/00
G06G 7/70

US Classification:

385 12, 385 37, 385113, 385136, 385137, 701100

Abstract:

A fiber Bragg grating multi-point temperature sensing system comprises a fiber sensing cable package and a plurality of clamping devices distributed along an inner surface of a wall in a circumferential direction for securing the fiber sensing cable package. The fiber sensing cable package comprises a fiber Bragg grating based sensing cable comprising at least one optical fiber, a plurality of Bragg gratings inscribed in the optical fiber, and a fabric layer and a sheath tube surrounding the optical fiber. The multi-point fiber temperature sensing system comprises a light source for transmitting light to the Bragg gratings based sensing cable package, and a detector module receiving reflected signal. Each clamping device comprises a radiation tee and defines at least one mounting hole for securing the fiber sensing cable.

US Patent:

8342010, Jan 1, 2013

Filed:

Dec 1, 2010

Appl. No.:

12/957626

Inventors:

Michael Krok - Clifton Park NY, US
John Bolton - Lake Luzerne NY, US

Assignee:

General Electric Corporation - Niskayuna NY

International Classification:

G01M 15/14

US Classification:

7311206

Abstract:

The present application provides a method of monitoring a compressor. The method may include the steps of determining a blade passing frequency, determining a power indication for a number of frequencies above and below the blade passing frequency, determining a ratio between a maximum power indication and a minimum power indication for the frequencies for a number of predetermined time intervals, and analyzing the ratio for each predetermined time interval to predict a surge condition of the compressor.

US Patent:

8392031, Mar 5, 2013

Filed:

Feb 28, 2011

Appl. No.:

13/036828

Inventors:

Michael Joseph Krok - Clifton Park NY, US
Yan Pan - Niskayuna NY, US
Wei Ren - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G05D 3/12
G05D 5/00
G05D 9/00
G05D 11/00
G05D 17/00
G06Q 10/00
G06Q 30/00

US Classification:

700291, 700286, 700295, 705 729, 705 731

Abstract:

A method of load forecasting for a present day includes obtaining past observed load values of at least three earlier days and identifying a relationship between the present day's load forecast and the past observed load values including unknown weights associated with the past observed load values. The values of unknown weights are determined by comparing at least one previous day's load forecast with the observed load value of the at least one previous day. The determined weight values are then used in the relationship between the present day's load forecast and the past observed load values to forecast the present day's load.