4 A Case Study in Predictive Modeling Beyond the Calibration Domain 31 Fig. 4.1 Mass-spring test setup of the first experiment 0 0.005 0.01 0.015 0.02 0.025 Displacement (m) 0 5 10 15 20 25 30 35 Force (N) Experimental Data and Linear Regression for Spring D Raw Data General Linear Regression Fig. 4.2 Measurements of forces versus displacements for spring D In addition to developing force-displacement models, the measurements are used to calibrate coefficients of a commonly used formula [9] that relates physical properties of a spring to its stiffness: k D˛K G dp Dq Nr (4.2)
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