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
System and method for improving cache efficiency
Apparatus and method for masking a clock signal
Information retrieval system, information retrieval method, and information retrieval program
Pharmaceutical treatment process using chitosan or derivative thereof
Multiple angle bend for high-voltage lines
Near-field transducers for focusing light
Decoration holder
  Randomly Featured Patents
Method of determining the optimum ratios of roll rotation speeds in a cold roll forming mill
Data mining systems and methods for heterogeneous data sources
Adjustable tie down apparatus and method
Device and method for protecting and sealing exposed wires
Golf club head
Anti-idiotype antibodies induced by synthetic polypeptides
Method and apparatus for recording magnetized mark utilizing magnetic field generated by adjacent magnetized mark to reduce energy level for generating pulsed magnetic field
Securing resources from untrusted scripts behind firewalls
Cooling system for an on-board inert gas generating system
8.beta.,12.alpha.-PGE.sub.2 -type compounds