Abstract: A method including identifying a plurality of maintenance schedules for a plurality of aircraft of a fleet of aircrafts each of which satisfy a minimum maintenance free operating period, monitoring and measuring a health of each of the aircrafts, utilizing the measured heath of the aircrafts within a degradation model in order to produce a plurality possible maintenance events for each of the aircrafts, each of the possible maintenance events associated with a different maintenance time, identifying at least one maintenance event for each aircraft in the fleet of aircraft using the set of possible maintenance events found for each aircraft from the plurality of maintenance schedules resulting in number of aircraft down for maintenance below a predetermined threshold, and executing the at least one maintenance event based on the at least one identified maintenance event.

Abstract: A method including identifying a plurality of maintenance schedules for a system each of which satisfy a minimum maintenance free operating period, monitoring and measuring a health of the system, utilizing the measured heath of the system within a degradation model in order to produce a plurality of system degradation sequences, identifying at least one maintenance event from the plurality of maintenance schedules, executing the at least one maintenance event based on the at least one identified maintenance event and utilizing the system until the next MFOP after the at least one maintenance event has been executed.

Abstract: A sensor system and method includes first and second sensing elements, digital sensors, a host computer and a digital bus. The first sensing element is configured to collect first sensor data and the second sensing element is configured to collect second sensor data. The digital sensor includes a controller that is configured to receive the first and second sensor data and process the first sensor data together with the second sensor data to generate processed data. The host computer is configured to receive the processed data from the digital sensor over the digital bus.

Abstract: A sensor system and method includes first and second sensing elements, a digital sensors, a host computer and a digital bus. The first sensing element is configured to collect first sensor data and the second sensing element is configured to collect second sensor data. The digital sensor includes a controller that is configured to receive the first and second sensor data and process the first sensor data together with the second sensor data to generate processed data. The host computer is configured to receive the processed data from the digital sensor over the digital bus.

Abstract: In one example, a method includes measuring sensor data of at least one physical component having a known operational status. The method further includes generating a plurality of data points from the measured sensor data, each of the plurality of data points representing a measured occurrence of a feature of the measured sensor data. The method further includes iteratively sampling with replacement the data points to generate a plurality of subsets of the data points, and determining, within each of the plurality of subsets, a confidence interval having an upper bound and a lower bound to generate a plurality of confidence intervals having respective upper bounds and lower bounds. The method further includes generating a composite confidence interval having a composite upper bound based on a first central tendency of the respective upper bounds and a composite lower bound based on a second central tendency of the respective lower bounds.

Abstract: A method includes receiving, by an inventory management system (IMS) program executing on a computing device, a remaining useful life (RUL) formulation for a part of a machine that estimates an amount of time for which the part will continue to perform its intended function and a potential unscheduled maintenance event. The method also includes receiving, by the IMS program, replacement part order lead time data and anticipated replacement part inventory level data from a part inventory database. The method also includes determining, by the IMS program and based on the RUL formulation, the replacement part order lead time data, and the anticipated part replacement inventory level data, that an order for a replacement part should be initiated.

Abstract: The present disclosure relates to a method to a remaining useful life forecasting system. The system comprises a combination of hardware and software, configured to calculate the Remaining Useful Life (RUL) of a part. The system may be configured to receive as input, information characterizing the part's engineering design (geometry, material, design loads), actual measurements of the part's historical degradation profile, estimates of the part's forecasted loading usage, and approximations of the part's remaining structural load carrying capacity.

Abstract: A ground freezing system includes a metal feed pipe for delivering refrigerant to the lower end of a freeze pipe installed in a bore in the ground. The feed pipe is supported on a compression spring which accommodates thermal contraction of the feed pipe while maintaining support of its weight.

Abstract: A ground freezing system includes a metal feed pipe for delivering refrigerant to the lower end of a freeze pipe installed in a bore in the ground. The feed pipe is supported on a compression spring which accommodates thermal contraction of the feed pipe while maintaining support of its weight.

Abstract: A ground freezing method and apparatus compensates for geothermal gradients by supplying more refrigerant to deeper parts of the earth. One or more metal freeze pipes are installed in a bore and equipped with one or more feed pipes. The feed pipes extend to different depths with the longer feed pipes being larger to supply more refrigerant to greater depths and achieve uniform top to bottom ground freezing despite the effects of geothermal gradients.

Abstract: A ground freezing method and system which circulates refrigerated heat transfer fluid through freeze pipes in the ground at a low temperature of at least −52° C. (−62° F.) to minimize drilling for the freeze pipe installation. The heat transfer fluid is preferably aqua ammonia (ammonium hydroxide) because of its beneficial characteristics in this application. The circulating heat transfer fluid is preferably cooled by a refrigeration system that includes low and high stage cycles arranged in a cascade relationship and using ammonia or another refrigerant in the high stage refrigeration system and carbon dioxide as the refrigerant in the low stage refrigeration system.

Abstract: A voice messaging system and method includes a voice recorder/playback device to store a plurality of voice messages associated with a respective plurality of incoming calls. A receiver receives call related information associated with each of the respective plurality of incoming calls. A controller is provided to organize the plurality of voice messages for playback by the voice recorder/playback device based on pre-stored groupings of expected call related information irrespective of an order in which voice messages are stored. In one aspect the pre-stored groupings relate to various priority levels for playback sequencing. In another aspect the pre-stored groupings relate to a specific voice mailbox or bin to receive the voice message. In yet another aspect, voice recognition techniques may be utilized to query the voice messaging system, either locally or remotely, for voice messages grouped in accordance with the principles of the present invention.