Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Pharmaceutical composition comprising gabapentin or an analogue thereof and an .alpha.-aminoamide and its analgesic use
Exposure apparatus, exposure method, and device manufacturing method
System and method of verification of analog circuits
Coated article and method for making the same
Systems and methods for universal enhanced log-in, identity document verification and dedicated survey participation
Plants and seeds of hybrid corn variety CH424126
Computerized on-board system for controlling a train
  Randomly Featured Patents
Friction rock stabilizer and method of inserting same in an earth structure bore
Glass composition
Interactive entertainment system
Electrophysiology/ablation catheter having second passage
Speech coder and method
L2 cache controller with slice directory and unified cache structure
Concrete floor forming system
Reactive preclean prior to metallization for sub-quarter micron application
Biaryl-spiroaminooxazoline analogues as alpha 2C adrenergic receptor modulators
Aluminum inhibition system for wet rock wool insulation used in cryogenic systems