Resources Contact Us Home
Cycle monitoring method and apparatus

Image Number 16 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
Electromagnetic probe for measuring properties of a subsurface formation
Linerless labels
Integrated process for the manufacture of fluorinated olefins
Method and apparatus for transcoding and transrating in distributed video systems
Microcapsules, their use and processes for their manufacture
Author signatures for legal purposes
Method, base station and system for adjusting cell wireless configuration parameter
  Randomly Featured Patents
Talking phonics interactive learning device
Zoom lens and imaging apparatus
Vehicle body panel assembly
Intelligent information retrieval system using hierarchically classified preferences
Golfer's alignment device
Isocyanate compositions for low density polyurethane foam
Modular plug device
Bus control system incorporating the coupling of two split-transaction busses of different hierarchy
Data correlation and analysis tool
Tape loading device incorporating therein an intermediate gear for actuating loading gears