Diagnosis of Process Nonlinearities and Valve Stiction: Data Driven Approaches Tapa dura - 2008
de Ali Ahammad Choudhury; Sirish L. Shah; Nina F. Thornhill
Descripción de contraportada
In this book, Higher Order Statistical (HOS) theory is used to develop indices for detecting and quantifying signal non-Gaussianity and nonlinearity. These indices, together with specific patterns in the mapping of process output and controller output are used to diagnose the causes of poor control loop performance.
Often valve stiction is the main cause of poor control performance. A generalized definition of valve stiction based on the investigation of real plant data is proposed. A simple data-driven model of valve stiction is developed. The model is simple, yet powerful enough to properly simulate the complex valve stiction phenomena. Both open and closed loop results have been presented and validated to show the capability of the model.
Conventional invasive methods such as the valve travel test can detect stiction easily. However, they are expensive, time consuming and tedious to use for examining thousands of valves in a typical process industry. A non-invasive method that can simultaneously detect and quantify control valve stiction is presented. The method requires only routine operating data from the process. Over a dozen industrial case studies have demonstrated the wide applicability and practicality of this method.
In chemical industrial practice, data are often compressed for archival purposes, using various techniques. Compression degrades data quality and induces nonlinearity in the data. The issues of data quality degradation and nonlinearity induction due to compression are investigated in this book. An automatic method for detection and quantification of the compression present in the archived data is discussed. Compelling and quantitative analyses have been recommended to end the practice of process data compression.
Detalles
- Título Diagnosis of Process Nonlinearities and Valve Stiction: Data Driven Approaches
- Autor Ali Ahammad Choudhury; Sirish L. Shah; Nina F. Thornhill
- Encuadernación Tapa dura
- Edición Us Edition
- Páginas 286
- Volúmenes 1
- Idioma ENG
- Editorial Springer, Berlin, Germany
- Fecha de publicación 2008-09-11
- Ilustrado Sí
- Features Bibliography, Illustrated, Index, Table of Contents
- ISBN 9783540792239 / 3540792236
- Peso 1.3 libras (0.59 kg)
- Dimensiones 9.2 x 6.4 x 0.9 pulgadas (23.37 x 16.26 x 2.29 cm)
- Número de catálogo de la Librería del Congreso de EEUU 2008928126
- Dewey Decimal Code 629.836
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