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Session 2259

A Dynamic Parameter Estimation Experiment That IS Remotely Accessible Via Internet

Richard J. Kozick Maurice F. Aburdene Bucknell University

Abstract

A dynamic parameter estimation experiment for first-order systems is described. A novel feature of the experiment is its accessibility y for remote execution via the Internet. The concept of a remotely shared laboratory has been proposed as a way to use readily available communication facilities to share expensive laboratory facilities among several universities. The dynamic parameter estimation experiment described here is a prototype of remotely shared laboratory exercises that are safe and inexpensive.

1 Introduction

The concept of a remotely shared laboratory has been proposed previously [1] as a way to use read- ily available communication facilities to share expensive laboratory facilities among several universities. The laboratory at Bucknell University contains digital signal processing units from dSPACE corporation and Sun workstations. Each dSPACE unit [2] consists of four A/D and D/A channels and a digital signal processor. In addition, each dSPACE unit is directly connected to the Internet, which facilitates the remote access to the experiments. The dSPACE units can be programmed through Matlab, Simulink, or C language.

The objective of the experiment is to estimate the parameters (gain and time constant) of a first- order RC circuit by applying Taylor series from calculus, least-squares analysis, and statistical analysis of experiments. A program can be downloaded to the dSPACE unit through the Internet that applies a step function input to the circuit and then acquires the resulting time response. The circuit parameters are then estimated from the measured data using a recursive time-domain approach similar to that described in [3]. The user can execute the estimation procedure through the Internet interface and study aspects of its operation, such as convergence and performance with real data. A related frequency-domain parameter estimation procedure is described in [4].

- 2 Laboratory Environment

The laboratory hardware, software, and Internet connections include ten dSPACE DS1 102 Mini- boxes and ten Sun SPARCstation 5 workstations [2, 5] as shown in Figure 1. The Miniboxes and Sun workstations communicate through an Internet connection. Each Minibox and workstation has its own 1P (Internet Protocol) address and is remotely accessible from any Internet site. The Internet access to the laboratory makes it possible to develop experiments that can be shared among several universities, as \’,. x,,,,A

{D~~ 1996 ASEE Annual Conference Proceedings ‘..,,131Y13$

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Kozick, R. J., & Aburdene, M. F. (1996, June), A Dynamic Parameter Estimation Experiment That Is Remotely Accessible Via Internet Paper presented at 1996 Annual Conference, Washington, District of Columbia. 10.18260/1-2--5998