Resources Contact Us Home
Cycle monitoring method and apparatus

Image Number 17 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
Communications in an asynchronous cellular wireless network
Display apparatus, control method thereof, and program
Method and system for providing magnetic junctions having improved characteristics
Field emission cathode device and field emission display using the same
Horizontal card holder
Superconducting magnetizer
System and method for discontinuous reception control start time
  Randomly Featured Patents
Methods and apparatus for selectively updating memory cell arrays
Electro-magnetic linear drive
Production method for organic electroluminescent device
Hair conditioning composition
Personality generator for conversational systems
Process for producing an electrochemical biosensor
Timepiece receptive of a broadcast time-signal for correcting a time error
Ear canal speaker system method and apparatus
Method for improving the environment within soil embedded culvert and bridge systems
Traction control system for automotive vehicle and traction control method therefor