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
Fishing apparatus
Multi-user remote health monitoring system with biometrics support
Reconfigurable barrel shifter and rotator
HYR1 as a target for active and passive immunization against Candida
Layout design defect repair based on inverse lithography and traditional optical proximity correction
Method and apparatus to maintain welding current to compensate for deterioration of welding contact tip
Refuelable battery-powered electric vehicle
  Randomly Featured Patents
Fishing reel free spool activator
Systems and methods for exporting, publishing, browsing and installing on-demand applications in a multi-tenant database environment
Rack for plural cylindrical objects
Tablet computer device
LSI encoding device with pixel data blocking and vertical decimating circuits
Reference catheter for impedance calibration
Apparatus for determining the refractive-index profile of optical fibers
Bedpan system
Method for significantly enhancing the quality of scoured wool and machinery for achieving those enhancements
Microwave oven