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
Salts and polymorphs of desazadesferrithiocin polyether analogues as metal chelation agents
Optical recording medium, and method for producing optical recording medium
Dry-cooling unit with gravity-assisted coolant flow
Liquid crystal display having wide viewing angle
Display unit and display method
System and method for supporting fibre channel over ethernet communication
System and method for burst separation and extended interleaving length
  Randomly Featured Patents
Rotary damper
Bearing metal positioning structure in a split connecting rod
Device for feeding a printing plate to a plate cylinder of a printing press
Boron control system for a nuclear power plant
Continuously variable speed transmission
Foam dispensing apparatus
Method for simulating operation of an automated banking machine system
2-oxoquinoline compounds and pharmaceutical uses thereof
Air handling and chemical filtration system and method
Universal multimedia optic disc player and its application for revocable copy protection