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
Bi-level switching with power packs
Adjustable high precision surveying device
Global codebook for coordinated multi-point processing
Dynamically updating privacy settings in a social network
Method and system for providing geohazard information to customers
Beverage container lid
Methods and compositions for inhibiting progression to chronic cardiac failure
  Randomly Featured Patents
Peptide derivatives
Projector with guiding rib in vent
Support structure for folding tables and like structures
Inkjet recording apparatus and ink cartridge
Suspension assembly with adjustable gramload
Method for treating psoriasis by administering human antibodies specific for Interleukin 15 (IL-15)
System and method for using profiles to manage data streams for device verification
Silver-halide color photographic light-sensitive material
Electric coupler for battery of vehicle or the like
Thermally stable reference voltage generator for MRAM