A new method for modeling large flexible structures

Article Abstract:

The emergence of electronic flight-control systems into commercial aircraft designs has precipitated an immediate need for nonlinear, discrete-time analyses in both frequency and time-domains, for both the aircraft Structural Dynamic Loads and the Flight Controls communities. This paper presents and demonstrates a methodology by which the large-scale, linear aircraft structural models produced by the Structural Dynamic Loads community can be easily reformulated using EASY5x. EASY5x then provides an environment for incorporating nonlinearities and discretization; and moreover, it provides an intuitive and tractable environment for engineers who are not well versed in linear analysis techniques to manipulate and analyze both the plant and its interactions with a nonlinear, discrete-time control system. The paper then goes on to present a method for transforming the large-scale linear plant into the z-domain using EASY5x. The resulting state-transition matrices propagate the exact solution to structural model equations of motion so simulation accuracy is greatly increased while run-time for statistically significant simulated time intervals is dramatically reduced. Furthermore, the analysis is brought into the efficient, graphically driven environment of the engineering workstation. (Reprinted by permission of the publisher.)

Product introduction, Structural analysis software, Control systems, Performance improvement (Computers), Modeling, Data modeling software, Simulation, Accuracy, Aircraft, Scientific Research, New Technique, Performance Improvement

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Knowledge-based model construction for simulating information systems

Article Abstract:

The process of constructing a correct simulation model for a system is a difficult and time-consuming task in the simulation life-cycle. Simulation is a widely used methodology for checking the performance requirements of information systems. This paper describes a knowledge-based approach to constructing a simulation model of an information system. The approach consists of two major steps: first, the information system is modeled as a Petri Net and implemented in a logic-based language. Second, the executable representation of the Petri Net is used to automatically construct a simulation model of the information system in GPSS. The approach offers several benefits such as reducing system development time, allowing the flexibility of easy modifications to the information system configuration, and requiring little knowledge of simulation methodology. The knowledge-based system is implemented in PROLOG. (Reprinted by permission of the publisher.)

Systems analysis, Industrial research, Knowledge-based systems, Information systems, Petri nets, Research and Development, System Design, Knowledge-Based System, Simulation of Computer Systems, Modeling of Computer Systems

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