Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Cycle monitoring method and apparatus










Image Number 15 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
Wake-up radio system
Taxi cab key chain
Integrated circuit package system with bonding lands
Methods and compositions for inhibiting progression to chronic cardiac failure
Light emitting device and light emitting device package
Apparatus for touch screen avionic device
Chair
  Randomly Featured Patents
Paper handling apparatus for receiving adjacently positioned paper sheets, transporting and depositing the sheets, spread-apart, in a receiving system
Ultra-low latency packet transport in ad hoc networks
Method and apparatus for warning a following vehicle during braking
Phosphorus acid amides
Connector with guide ribs and reinforcing ribs
Apparatus and method for automatically adjusting camera
Image compression apparatus and method, image regeneration apparatus, camera and camera system
Laser processing apparatus
Seat
Heart assist device and method of use