Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Systems and methods of using dynamic data for wear leveling in solid-state devices
Automated synchronization of design features in disparate code components using type differencing
Method and system for advertisement using internet browser to insert advertisements
Preventative traffic congestion social networking improvement system within a community
Mobile terminal device capable of more effectively utilizing operation portions, conductive portion, operation detecting unit, power supply unit, and signal processing unit
CMOS image sensor
Apparatus and method for multiple pagings in broadband wireless communication system
  Randomly Featured Patents
Homologous carboxylic acids production
Capillary blood antigen testing apparatus
Die-casting machine
Projectile and related gun
Method for improving the coding efficiency of an audio signal
Debris shield/flash reducer
Poker machine with improved security after power failure
Seed layer for fabricating spin valve heads for ultra-high density recordings
Apparatus and method of inspecting the surface of a wafer
Controlling impedance and thickness variations for multilayer electronic structures