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
Semiconductor device and method of manufacturing the same
DC/DC converter, power supply circuit, and semiconductor device
Systems and/or methods for determining item serial number structure and intelligence
Light emitted diode
Porous objects having immobilized encapsulated biomolecules
Method and apparatus for communication channel error rate estimation
Image forming apparatus assembled with a fixing member and a pressing member
  Randomly Featured Patents
Electrical indicating circuit
Apparatus for receiving, transporting, chopping, and dispensing blocks of fodder
Method and apparatus for modifying an information page transmitted in a communications network
Temperature cycle indicating means for a sterilizer unit
Crystalline propylene copolymer compositions having improved sealability and optical properties and reduced solubility
Substituted pyrrolo-pyrazole derivatives as kinase inhibitors
Semiconductor device
Electrical signal connector providing a proper installation of a cable
Method of breeding germinable transgenic broadleaved tree species
Visualization and interaction models