Model parameters and error metrics for modeling the rotatory mechanical impedance around the xh- and zh-axis

Various multi-mass oscillator models were parameterized as part of a publication on modeling the rotational mechanical impedance around the xh- and zh-axes of the human coordinate system according to ISO 5349-1:2001, The publication will appear shortly in the conference proceedings of the “5th VDI Symposium on Vibrations 2025: Solutions for Vibrations.” The underlying studies used for the parametrization are published as data sets under DOI 10.35097/1r2qfkquz7mzar0s and DOI 10.35097/vfrrc2hbxkujanz8.

Based on this data sets, the three-, four-, and five-mass oscillators are parametrized for four different combinations of grip and push forces, as well as the mean rotational mechanical impedance of the study. The parametrization was achieved by using an optimization algorithm of the Matlab (2023b, The Math Works Inc., Natick, USA) internal functions GlobalSearch and fmincon. Furthermore, all multi-mass oscillators were parameterized without weighting and with a weighting function for emphasizing frequencies between 10 and 150Hz.