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
Liquid crystal display having wide viewing angle
Xylitol-based anti-mucosal compositions and related methods and compositions
Positive electrode active material for nonaqueous electrolyte secondary battery
Image forming apparatus with static elimination
Apparatus, electronic component and method for generating reference voltage
Coordinate measuring device and method for measuring with a coordinate measuring device
Vehicle having power supply apparatus
  Randomly Featured Patents
Magnetic storage medium
Method for aligning shallow trench isolation
Method for detecting crystal defects in semiconductor silicon and detecting solution therefor
Multi-spindle lapping machine
Combined facsimile, telephone answering machine and modem
Mobile terminal
Plant adenylosuccinate lyase and DNA coding therefor
Invalid positioning device
Interactive techniques for organizing and retrieving thumbnails and notes on large displays
Process for stabilizing photographic material containing magenta coupler