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
Crib with adjustable height mattress
Spray gun having mechanism for internally swirling and breaking up a fluid
Dielectrophoresis apparatus including concentration gradient generating unit, method of separating material using the same, and method of screening condition for separating material
Spreading comments to other documents
Methods and apparatus providing an E-enabled ground architecture
Device for reducing aerodynamic noise from an aircraft undercarriage
Coupling with one-piece plural nipples
  Randomly Featured Patents
Computer-controlled circuit breaker arrangement with circuit breaker having identification circuit
Stilbeneamine derivative and electrophotosensitive material using the same
Color image forming apparatus with polygonal mirror rotation phase control
Luggage case
Sealing systems for garage door
Method and apparatus for heating and smelting pulverous solids and for volatilizing the volatile ingredients thereof in a suspension smelting furnace
Power boosting in a wireless communication system
Method and apparatus for performing communication rate control using geometric weighted groups
Separation particles
Display apparatus