Resources Contact Us Home
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
Method of and apparatus for image denoising
Potentiometric-sensor chip, potentiometric assay, and assay kit
Bandpass filter and radio communication module and radio communication device using the same
Methods and systems for automated backups and recovery on multi-os platforms using controller-based snapshots
Non-transitory computer readable recording medium storing print management program, print management device, print management method, and print system
Optical recording medium, and method for producing optical recording medium
Method and structure for forming ETSOI capacitors, diodes, resistors and back gate contacts
  Randomly Featured Patents
Footwear sole
Address assignment in digital transmission system
Rotary damper and automobile part comprising it and auxiliary mechanism of rotary operation
Enzymatic process for the manufacture of ascorbic acid, 2-keto-L-gulonic acid and esters of 2-keto-L-gulonic acid
Servo control valve for a hydraulically-actuated device
Medical composition containing nitroetheneamine derivative or salt thereof as active constituent
Information processing apparatus including magnetic material having a predetermined magnetization pattern with respect to a recording medium
Therapeutic forearm appliance having pressure pad containing parallel chambers
Heterocyclic derivatives of alkoxyacrylates with a fungicidal activity
Sensor for monitoring the cooling liquid of heat exchanger circuits