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










Image Number 10 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
Encrypting method, recording medium of encrypting program, decrypting method, and recording medium of decrypting program
Method and apparatus for treating tissue
Spacer grid with saddle-shaped supports and corresponding nuclear fuel assembly
Method of treating scoliosis using a biological implant
Apparatus and system for imaging currency bills and financial documents and method for using the same
Calibration of time constants in a continuous-time delta-sigma converter
Screening assay for agents that alter target of rapamycin activity
  Randomly Featured Patents
Pin assembly and implements connecting apparatus
Process for preparing rubber sheet and tread and studless tire using same
Internal combustion engine having aluminum alloy cylinder block
Method and apparatus for enhancing drag and drop manipulation of objects in a graphical user interface
Selective display of graphical user interface elements
Portable telephone antenna
Container lid
Tread rubber composition and pneumatic tire employing the same
Condenser vacuum load compensating system
Temporary joist hanger