System's Nonlinearity Measurement Based on the Rpn Concept
نویسندگان
چکیده
The nRPN, nRPNSTAT, and nRPNDYN are three novel indexes to measure system's nonlinearity. These nonlinear measurements are derived from the Robust Performance Number (RPN) concept. The total system's nonlinearity can be measured by the nonlinear RPN (nRPN), while the purely static nonlinearity is captured by nonlinear static RPN (nRPNSTAT) and the dynamic component by the nonlinear dynamic RPN (nRPNDYN). The novel indexes do not require a nonlinear model, being enough a set of linear models. Therefore, they can easily be applied to quantify the nonlinearities of industrial plants and used to answer several practical important questions such as: How nonlinear is the system? Is it necessary to apply a nonlinear controller? What kind of nonlinear controller is necessary? Copyright 2004 IFAC
منابع مشابه
A New Structure for Direct Measurement of Temperature Based on Negative Temperature Coefficient Thermistor and Adaptive Neuro-fuzzy Inference System
Thermistors are very commonly used for narrow temperature-range high-resolution applications, such as in medicine, calorimetry, and near ambient temperature measurements. In particular, Negative Temperature Coefficient (NTC) thermistor is very inexpensive and highly sensitive, whose sensing temperature range and sensitivity are highly limited due to the intrinsic nonlinearity and self-heating p...
متن کاملApplying the concept of exponential approach to enhance the assessment capability of FMEA
Failure modes and effects analysis (FMEA) has been used to identify the critical risk events and predict a system failure to avoid or reduce the potential failure modes and their effect on operations. The risk priority number (RPN) is the classical method to evaluate the risk of failure in conventional FMEA. RPN, which ranges from 1 to 1000, is a mathematical product of three parameters—severit...
متن کاملModeling of measurement error in refractive index determination of fuel cell using neural network and genetic algorithm
Abstract: In this paper, a method for determination of refractive index in membrane of fuel cell on basis of three-longitudinal-mode laser heterodyne interferometer is presented. The optical path difference between the target and reference paths is fixed and phase shift is then calculated in terms of refractive index shift. The measurement accuracy of this system is limited by nonlinearity erro...
متن کاملRisk Priority Number: A Measuring Instrument for Hygienic Management on Broiler Farms, Reflecting Their Campylobacter Status
Hygiene management is essential for rearing Campylobacter free broiler flocks. In this study, several hygiene factors (e.g., thinning, water supply, stable cloths, stable condition, stable environment, etc.) are categorized and aggregated in a developed risk priority number (RPN). This number is measuring the quality of hygiene management of a broiler farm with one single value (range: 801–4005...
متن کاملMathematically modeling of target speed effect on nonlinearity in DTLMI-based nano-metrology system
Jones matrix computation is one of the widely used methods in nonlinearitycalculation in laser interferometers. In this paper, the nonlinearity error in developedthree-longitudinal mode heterodyne interferometer (DTLMI) has been mathematicallymodeled at various speeds, by using Jones matrix calculations. This review has been donedespite the fact that simultaneously the main factors including no...
متن کامل