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Chinese Journal of Mechanical Engineering

Table 3 Accuracy of linear, separable and complete quadratic RS models for the 6-bar truss structure problem

From: Multivariate Rational Response Surface Approximation of Nodal Displacements of Truss Structures

Evaluation standards

Linear form

Separable quadratic form

Complete quadratic form

Multiple fitting coefficient \(R^{2}\)

0.8026

0.8991

0.9996

Modified multiple fitting coefficient \(R_{\text{adj}}^{2}\)

0.8026

0.8990

0.9996

Maximum relative error ζmax/%

28.68

22.66

14.43

Minimum relative error ζmin/%

2.76

3.98

5.01

Average relative error ζavg/%

18.93

11.82

8.96

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