An autocorrelation function test for output validation
Article Abstract:
Output validation is a major aspect of simulation validation in general. In continuous simulation (e.g., System Dynamics), output validation involves demonstrating that the model is able to reproduce the dynamic time patterns that have been observed in the behavior of the real system. But standard statistical tests cannot be readily used to make such dynamic time pattern comparisons (i.e., periodicities, amplitudes, trends...). In this paper, we propose an output validity test that addresses the above need. The test consists of comparing the autocorrelation functions of the observed and model-generated outputs. Using simulation experiments, we demonstrate the application of the test to different situations, such as systems with large noise, observation errors, and models with parameter errors. The test is shown to detect significant errors in the fundamental periods of the observed and model-generated outputs. The test can also determine if the observed output has high frequency noise components (such as observation errors) not present in the model output. Experiments also demonstrate that interpreting the results of the autocorrelation function test is rather intuitive and simple, which is a major advantage of the test. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1990
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Computer-aided VSS control validation for a rotating flexible link manipulator using ANSYS
Article Abstract:
This paper presents a design methodology for controllers of flexible structures based on uncertain modeling techniques. The particular problem which is address is the control of a single flexible link planar manipulator. An extremely simple control strategy is derived by treating the effects of compliance as an uncertain torque about which no a priori knowledge is assumed other than a bound. However, because the torque is modeled an an uncertainty, we must perform computer-aided validation of our design using a finite-element model for our manipulator. Hitherto, the finite-element package ANSYS has been widely used as a modeling/analysis tool for flexible structures. However, developments in the ANSYS (version 4.3 and later) allow the interfacing of external programs with the analysis package, thereby enabling closed-loop control strategies to be tested. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1993
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