Resources Contact Us Home
Cycle monitoring method and apparatus

Image Number 10 for United States Patent #4908775.

The present invention is a cycle monitoring system and method that acquires, logs and analyzes analog and/or digital signals from component sensors in a process control plant such as a nuclear power plant. The system continuously monitors the sensors and records steady-state and transient phenomena. Compression of the data is performed to reduce storage load. The compression ratio for transient data is driven by a threshold indicating a measurement signficant to stress determination. Transient data is retained at a higher sampling rate, so that the parameters of transient such as the maximum value can be determined for stress analysis. The stress analysis determines pressure and thermal stresses which are used to calculate a usage factor which indicates the stress age and thus the remaining life of a component. The system provides estimates of fatigue accumulation associated with selected locations of critical power plant components. Measurements of plant process and response parameters are used to provide data for calculation of fatigue accumulation. The system includes a computer containing a database that includes thresholds and response characteristics of the plant components to varying types of stress. The process required to calculate fatigue for monitored components and locations uses Duhamels integral to calculate transient stress, combines the transient stress with other stresses to produce a usage factor from stress ranges designating when a stress cycle has occurred. The system can be used to plan routine maintenance, repair and replacement decision, and to justify alternative plant operation modes and life extension.

  Recently Added Patents
Pressure-applying member, fixing device, and image forming apparatus
Avalanche photo diode and method of manufacturing the same
Mobile target system
Integrated emergency medical database system
Wireless monitoring in process applications
Closed cell culture system
Vehicle fender
  Randomly Featured Patents
Maize variety hybrid X08A243
Editing system with router for connection to HDTV circuitry
Wrapping apparatus
Deck mechanism for magnetic record and playback device
Tilting drive arrangement for a converter
Rotating silage extractor and conveyor arm
Dental tool and nozzle therefor
Key duplicating machine
Two-pressure, pneumatic conveying system for rod-like articles with partial air venting
System and method for dynamic power control for energy efficient physical layer communication devices