KEVIN DOWDELL
Engineers in Pittsburgh, PA

6414495, Jul 2, 2002

Nov 10, 2000

09/710107

Anthony M. Di Tommaso - Cranberry Township PA
Kevin Dowdell - Pittsburgh PA

ABB Automation Inc. - Wickliffe OH

G01R 2702

324604

An event marker is generated from the periodic input voltage received from the notch in a shaft of a rotating machine. Positive and negative peak voltages each attenuated by ½ are detected from the periodic input voltage. The attenuated detected positive and negative peak voltages are combined to provide a bias voltage which is subtracted from the periodic input voltage to give an output voltage representative of the event marker.

6535124, Mar 18, 2003

Apr 3, 2001

09/824972

Anthony M. DiTommaso - Cranberry Township PA
Kevin Dowdell - Pittsburgh PA
Michael J. Kleya - Monroeville PA
William J. Kline - Penn PA

ABB Automation Inc. - Norwalk CT

G08B 2300

340529, 340438, 340439, 340511, 123294, 701100

A method and apparatus for analyzing and signal conditioning the pulsation signal derived from combustion of fuel in a turbine. There are one or more user defined frequency bands and the method and apparatus provides a digital signal for the true RMS value of each of the user defined bands. Turbine protection logic has as its input the digital true RMS values for each such band and inspects that value to determine if the frequencies in that band exceed a predetermined level for a predetermined period of time.

6668234, Dec 23, 2003

Mar 22, 2002

10/104827

Anthony M. DiTommaso - Cranberry Township PA
Kevin Dowdell - Pittsburgh PA
Ljubisa Milojevic - Pittsburgh PA

ABB Inc. - Norwalk CT

G01R 1300

702 66, 702 56

A sampled data system for computing the amplitude of a signal received from a vibration sensing probe minus the fundamental frequency associated with the running speed of a rotating machinery shaft. This signal is known as the Not 1X waveform and variations in its amplitude can signal problems with bearings, rotors, cracks or mechanical looseness, and/or fluids of the rotating machine. The amplitude of the Not 1X waveform can be provided in either peak to peak amplitude, peak amplitude, absolute average or root mean square.

8437968, May 7, 2013

Aug 5, 2008

12/673115

Kevin Dowdell - Pittsburgh PA, US

ABB Technology AG - Zurich

G01F 17/00

702 56

A method is disclosed for monitoring the vibration of a rotating shaft including, measuring a current shaft position and determining a centroid of the shaft. The current shaft sector is then determined. The current distance between the centroid and the current shaft position may then be determined. The current distance is compared with a previously stored maximum distance for that sector, and if greater, the current shaft position and current distance is stored as the new maximum for that sector. After a predetermined period of time, the maximum displacement between the stored maximum positions is calculated, which represents the maximum shaft displacement peak to peak. This value may then be visually displayed or automatically monitored by shaft control computers.