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
Identification of websites that break out of frames
Case for a tablet computer
Synchronization processing circuit and synchronization processing method in wireless communication system
Towel clip
Multiple secure elements in mobile electronic device with near field communication capability
Systems and methods of device-free motion detection and presence detection
Dynamic lookup service in a distributed system
  Randomly Featured Patents
Display apparatus
Image sensors and driving method thereof
Composition and method for repelling moles, voles and gophers
Tire inflation station
Automatic media readying system and method
Pharmaceutical product container
Ink jet recording apparatus
One piece security seal and new sealing system
Molecular analyzer and method of use
Multizone laundry iron and method for the thermal regulation of the hot part