http://publicationslist.org/data/isomjd/atom.xml Joshua Isomhttp://publicationslist.org/isomjd$basepathfavicon.icoRecent additions to Joshua Isom's PublicationsList.org pagehttp://publicationslist.org/publications.png2012-05-25T12:48:25Z http://publicationslist.org/isomjd/refid27 2012-05-24T17:39:57Z

A system for reconstructing sensor data in a rotor system that comprises a rotating component of the rotor system, a plurality of sensors in the rotating component to sense at least one of loads and motion characteristics in the rotating component and to generate sensor data, and an analysis unit to generate reconstructed sensor data from the sensor data using numerical analysis for low-rank matri...<br/><br/>Joshua Isom, Sergey Shishkin (2012) <i>US Patent Application, filed May 10, 2012</i><br/>

http://publicationslist.org/isomjd/refid21 2012-05-25T12:48:08Z

A system for monitoring for pushrod faults in an aircraft includes a pushrod; a sensor mounted on the pushrod, the sensor wirelessly transmitting measured pushrod load data; a receiver receiving the measured pushrod load data; a model receiving flight data and generating a modeled pushrod load profile; and a fault detector comparing measured pushrod load data to the modeled pushrod load profile to...<br/><br/>Joshua D. Isom, Mark W. Davis, William A. Welsh, Brian E. Morris, James P. Cycon (2011) <i>World Patent Application, filed Jun 22, 2011 </i><br/>

http://publicationslist.org/isomjd/refid25 2011-04-13T21:13:30Z

A common approach to process monitoring based on principal component analysis (PCA) assumes that fault-free, noise-free data is sampled from a low-dimensional subspace. Although widely described and applied, process fault detection and isolation using PCA is not robust to outliers in the training data, is hard to properly tune, and is not capable of isolating multiple faults. A newly introduced ...<br/><br/>Joshua D. Isom, Robert E. LaBarre (2011) <i>2011 American Control Conference</i> <br/>

http://publicationslist.org/isomjd/refid26 2011-10-03T14:24:10Z

The time synchronous average (TSA) is a simple but powerful tool for extracting deterministic vibration components that are synchronous with one single shaft and thus diagnosing faults caused by shafts or gears. The task of extracting random vibration components associated with gears, shafts, or bearings is more challenging. The residual obtained by subtracting the single shaft TSA contains compon...<br/><br/>Guicai Zhang, Joshua D. Isom (2011) <i>Annual Conference of the Prognostics and Health Management Society</i> <br/>

http://publicationslist.org/isomjd/refid16 2010-10-12T12:13:58Z

Probabilistic latent component analysis (PLCA) is applied to the problem of gearbox vibration source separation. A model for the probability distribution of gearbox vibration employs a latent variable intended to correspond to a particular vibration source, with the measured vibration at a particular sensor for each source the product of a marginal distribution of vibration by frequency, a margina...<br/><br/>Joshua Isom, Madhusudana Shashanka, Ashutosh Tewari, and Aleksandar Lazarevic (2010) <i>Annual Conference of the Prognostics and Health Management Society</i> <br/>

http://publicationslist.org/isomjd/refid13 2010-08-18T22:24:24Z

A fuel cell assembly includes a cell stack assembly having a flow field configured to provide a fluid flow. The fluid flow has an acid and a water content. A condenser heat exchanger is arranged downstream from and fluidly connected to the flow field by a fluid flow passage. The condenser heat exchanger is configured to receive the fluid flow from the flow field through the fluid flow passage. A ...<br/><br/>Joshua D. Isom, John W. Kowalski, Ricardo O. Brown, Sitaram Ramaswamy, Kazuo Saito, Masaki M. Yokose, Bryan F. Dufner (2010) <i>World Patent Application, filed July 29, 2010</i><br/>

http://publicationslist.org/isomjd/refid17 2010-08-18T22:05:32Z

The Integrated Vehicle Health Management System (IVHMS) fielded on the UH-60M aircraft has an open-system architecture and third-party software capability that has allowed Sikorsky Aircraft to expedite the development and insertion of advanced health-monitoring technologies. Sikorsky has used this capability over the past two years to develop real-time applications for 1) airframe and rotor sys...<br/><br/>Mark W. Davis, Brian E. Morris, James P. Cycon, Joshua D. Isom, Enrico Manes, Paul Attridge (2010) <i>2010 Forum of the American Helicopter Society</i> <br/>

http://publicationslist.org/isomjd/refid14 2010-08-26T16:39:46Z

A system and method for operating fuel cell power plant includes enclosing fuel bearing components, such as fuel cell stack and reformer, into a fuel compartment separate from motorized components in a motor compartment, and consuming leaked fuel in the fuel compartment using a fuel bearing component such as cell stack and/or burner, thereby reducing fuel emissions from the plant.<br/><br/>John L. Preston, Peter F. Foley, Paul R. Hanrahan, Joshua D. Isom (2010) <i>World Patent Application, filed July 22, 2010</i><br/>

http://publicationslist.org/isomjd/refid19 2010-10-25T20:44:47Z

A method of real-time rotor fault detection includes measuring a set of loads to obtain measured signals and virtually monitoring the set of loads to obtain estimated signals. The estimated signals are subtracted from the measured signals to obtain residuals and the residuals are compared to a categorical model. A categorical output representative of a rotor fault is identified within the catego...<br/><br/>Joshua D. Isom, Brian E. Morris (2010) <i>US Patent Application, Filed February 28, 2010.</i><br/>

http://publicationslist.org/isomjd/refid20 2011-05-19T12:44:19Z

A computer-implemented method, system, and computer program product for virtual monitoring of aircraft fleet loads are provided. The method includes calculating virtual load data associated with an aircraft from a set of orthogonal waveforms. The method also includes calculating a set of coefficients as a function of parametric data and high frequency data associated with an aircraft. The metho...<br/><br/>Joshua D. Isom, Mark W. Davis, James P. Cycon, Erez Eller (2010) <i>Provisional US patent application, filed November 12, 2009</i><br/>

http://publicationslist.org/isomjd/refid4 2010-08-26T16:45:05Z

The challenge of detecting a change in the distribution of data is a sequential decision problem that is relevant to many engineering solutions, including quality control and machine and process monitoring. This dissertation develops techniques for exact solution of change-detection problems with discrete time and discrete observations. Change-detection problems are classified as Bayes or minimax ...<br/><br/>Joshua D. Isom (2009) <br/>

http://publicationslist.org/isomjd/refid5 2011-01-28T23:16:43Z

A novel general framework for distributed anomaly detection with theoretical performance guarantees is proposed. Our algorithmic approach combines existing anomaly detection procedures with a novel method for computing global statistics using local sufficient statistics. Under a Gaussian assumption, our distributed algorithm is guaranteed to perform as well as its centralized counterpart, a condit...<br/><br/>Aleksandar Lazarevic, Nisheeth Srivastava, Ashutosh Tewari, Josh Isom, Nikunj Oza, Jaideep Srivastava (2009) <i>2009 IEEE International Conference on Data Mining Workshops</i> <br/>

http://publicationslist.org/isomjd/refid18 2010-08-18T22:20:57Z

The Integrated Vehicle Health Management System (IVHMS) fielded with the Army UH-60M Black Hawk provides drivetrain diagnostics, rotor track and balance, exceedance, operational usage, engine performance, bearing monitoring, structural regime recognition, cockpit voice and flight data recording functionality. As with the systems predecessor, the Integrated Diagnostics Health and Usage Managemen...<br/><br/> Shawn Tayloe, Tim Flynn, Joshua Isom (2009) <i>2009 Forum of the American Helicopter Society</i> <br/>

http://publicationslist.org/isomjd/refid23 2011-05-19T12:45:20Z

A phosphoric acid fuel cell (PAFC) system includes a cell stack assembly having an anode, a cathode and a coolant portion. At least one heat exchanger is fluidly interconnected with at least one of the anode, the cathode and the coolant portion and provides a fluid path for receiving a fluid from the anode, the cathode and/or the coolant portion. An absorption cycle refrigerant system includes a...<br/><br/>Mithun Kamat, Leslie VanDine, Joshua Isom, Sitaram Ramaswamy (2009) <i>US Patent Application, filed September 9, 2009</i><br/>

http://publicationslist.org/isomjd/refid6 2010-08-19T10:45:20Z

Change detection problems are ubiquitous, but there are no existing tractable techniques for epsilon-exact solutionof discrete-time, discrete-observation problems. A polynomial-time algorithm for solution of Markov Bayes change detectionproblems is presented. The algorithm combines backward induction on a tree with induction of bounds on the value function at specific points from those of neighbor...<br/><br/>Joshua D. Isom, Robert E. LaBarre, Richard D. Braatz (2009) <i>Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference</i> <br/>

http://publicationslist.org/isomjd/refid22 2010-11-09T18:44:05Z

A fluidized contaminant separator and water-control loop decontaminates a fuel reactant stream of a fuel cell. Water passes over surfaces of an ammonia dissolving means within a fluidized bed while the fuel reactant stream simultaneously passes over the surfaces to dissolve contaminants from the fuel reactant stream into a separated contaminant and water stream. A fuel-control heat exchanger ups...<br/><br/>Derek Hildreth, Lynn Reni, Paul Hanrahan, Leslie VanDine, Joshua Isom, John L. Preston (2009) <i>US Patent Application, filed April 27, 2009</i><br/>

http://publicationslist.org/isomjd/refid3 2010-08-19T10:46:18Z

Fuel processing by a reformer and a shift reactor converts hydrocarbon feedstock and steam to hydrogen-rich reformate, such as for use in a fuel cell power plant. Some of the reformate is recycled through a restriction to the inlet of a feedstock pump, thereby increasing its pressure sufficiently to cause recycle flow through a hydrodesulfurizer and the secondary inlet of an ejector driven by th...<br/><br/>Peter F. Foley, Joshua D. Isom, John L. Preston (2008) <i>World Patent Application, filed May 22, 2008.</i><br/>

http://publicationslist.org/isomjd/refid1 2010-08-18T22:25:03Z

The control system utilizes an oxygen sensor to sense an oxygen concentration within a burner exhaust of a fuel processing system wherein the burner device utilizes an anode exhaust stream from a fuel cell to supply heat to a reformer. If the anode utilization by the fuel cell anode exceeds an acceptable range, less hydrogen is available for the burner device and more oxygen will therefore be s...<br/><br/>Joshua D. Isom (2008) <i>World Patent Application, filed January 12, 2008</i><br/>

http://publicationslist.org/isomjd/refid15 2010-08-26T16:38:01Z

We describe an exact dynamic programming update for constrained partially observable Markov decision processes (CPOMDPs). State-of-the-art exact solution of unconstrained POMDPs relies on implicit enumeration of the vectors in the piecewise linear value function, and pruning operations to obtain a minimal representation of the updated value function. In dynamic programming for CPOMDPs, each vector...<br/><br/>Joshua D. Isom, Sean P. Meyn, Richard D. Braatz (2008) <i>Proceedings of the 23rd National Conference on Artificial Intelligence</i> <br/>

http://publicationslist.org/isomjd/refid2 2010-08-19T10:45:38Z

A homogeneous burner in a steam generator for fuel processing in a fuel cell power plant consumes unused hydrogen-containing reformate during startup of the fuel cell power plant, without damaging a catalytic burner which is upstream of the homogenous burner, and which consumes anode exhaust and produces steam during normal operation of the fuel cell power plant. During startup, little air is prov...<br/><br/>Paul R. Margiott, Zakiul Kabir, Joshua D. Isom, John L. Preston, Randy D. DaRos (2007) <i>World Patent Application, filed July 11, 2007</i><br/>

http://publicationslist.org/isomjd/refid7 2010-08-18T22:25:22Z

Provision is made in an organic rankine cycle power plant for modulating the flow of hot gases from a thermal source to the evaporator. The modulation device may be a blower on the downstream side of the evaporator and/or a valve on the upstream side thereof. The modulation device is controlled by generation of a digital signal to enable or disenable the modulation device and an analog signal for ...<br/><br/>Joshua D. Isom, Kent R. McCord (2007) <i>World Patent Application, filed May 29, 2007</i><br/>

http://publicationslist.org/isomjd/refid24 2010-08-26T16:38:32Z

Fuel from a source passes through a hydrogen desulfurizer and a proportioning mixing valve to a CPO, the temperature of the output of the CPO being monitored to provide a signal which a controller utilizes to adjust the valve. The output of the CPO may be passed through a water gas shift reactor and a preferential CO oxidizer to provide fuel to a fuel cell system. The air provided to the valve ...<br/><br/>Zakiul Kabir, Joshua Isom, Michael Yokose (2004) <i>US Patent Application, filed June 21, 2004</i><br/>

http://publicationslist.org/isomjd/refid9 2010-08-25T00:50:10Z

A fuel cell system includes a fuel cell for reacting a hydrogen rich gas; a fuel processor system for converting a hydrocarbon fuel-steam mixture into said hydrogen rich gas; and a system for preparing the hydrocarbon fuel-steam mixture which includes (a) structure for superheating a hydrocarbon fuel so as to provide a superheated fuel, and (b) structure for mixing water with the superheated fuel...<br/><br/>L. VanDine, B. Murach, P. Margiott, and J. Isom (2004) <i>U.S. Patent #6,740,435, issued May 25, 2004.</i><br/>

http://publicationslist.org/isomjd/refid10 2010-08-25T00:52:10Z

A control method and arrangement are provided in a fuel cell power plant for regulating fuel flow to a steam-based fuel processing system (FPS) associated with a low-temperature fuel cell stack assembly. A portion of the fuel provided by the FPS is used to provide steam for the FPS. The fuel flow to the FPS is regulated as a function of the power demand (I) on the fuel cell and at least the ent...<br/><br/>J. Isom, H. Pho, Z. Kabir, P. Margiott, and G. Vartanian. (2004) <i>U.S. Patent #6,818,336, issued November 16, 2004.</i><br/>

http://publicationslist.org/isomjd/refid8 2010-08-19T10:44:20Z

A fuel cell power plant having a plurality of functionally integrated components including a fuel cell assembly provided with a fuel stream, an oxidant stream and a coolant stream. The fuel cell power plant functionally integrates a mass and heat recovery device for promoting a transfer of thermal energy and moisture between a first gaseous stream and a second gaseous stream, and a burner for proc...<br/><br/>Kazuo Saito, Zakiul Kabir, Joshua D. Isom, Albert P. Grasso (2003) <i>US Patent 6,605,378, issued August 12, 2003</i><br/>