Qualitative Dynamic Behavior of Physical System Models With Algebraic Loops
نویسندگان
چکیده
TRANSCEND, a system for monitoring and diagnosis of abrupt faults in complex dynamic systems, relies on system models to predict dynamic behavior in response to abrupt faults. The use of qualitative predictions of this transient behavior mitigates complexity issues and convergence problems that exist in numerical diagnosis approaches. In this framework, it is important to model the system under diagnostic scrutiny at a level of detail that relates to the bandwidth of the measurement data. Too much detail results in a model that captures very fast dynamics as continuous transients, whereas they appear as discontinuous changes in the measured signals. In many cases, abstracting away these small parameter values may result in algebraic dependencies between variables, i.e., variables affect one another instantaneously without integrating effects. Because of the compensating effects inherent in physical system behavior, a straightforward deviation propagation results in predictions that are unknown in a qualitative sense. A method is proposed that recognizes such dependencies and propagates compensating effects without introducing unnecessary conflicts by tracking the origins of compensating influences in feedback loops.
منابع مشابه
Algebraic Matching of Vulnerabilities in a Low-Level Code
This paper explores the algebraic matching approach for detection of vulnerabilities in binary codes. The algebraic programming system is used for implementing this method. It is anticipated that models of vulnerabilities and programs to be verified are presented as behavior algebra and action language specifications. The methods of algebraic matching are based on rewriting rules and techniques...
متن کاملMixed Qualitative/Quantitative Dynamic Simulation of Processing Systems
In this article the methodology proposed by Li and Wang for mixed qualitative and quantitative modeling and simulation of temporal behavior of processing unit is reexamined and extended to more complex case. The main issue of their approach considers the multivariate statistics of principal component analysis (PCA), along with clustered fuzzy digraphs and reasoning. The PCA and fuz...
متن کاملDynamic Performance Analysis of Hysteresis Motors by a Linear Time-Varying Model
Hysteresis motors are self starting brushless synchronous motors which are being used widely due to their interesting features. Accurate modeling of the motors is crucial to successful investigating the dynamic performance of them. The hysteresis loops of the material used in the rotor and their influences on the parameters of the equivalent circuit are necessary to be taken into considerat...
متن کاملA Comparison Study on Various Finite Element Models of Riveted Lap Joint by the Use of Dynamic Model Updating
Till now, various models have been proposed in literature to simulate the behavior of riveted structures. In order to find the most accurate analytical method in modeling the dynamic behavior of riveted structures, a comparison study is performed on several of these models, in this research. For this purpose, experimental modal analysis tests are conducted on a riveted plate to verify the effic...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000