Einfluss der Anregungsform auf die mechanische Impedanz des menschlichen Hand-Arm-Systems Influence of Excitation Type on the Mechanical Impedance of the Human Hand-Arm System

In the human-machine interface, hand-held devices can cause vibrations to be transmitted from the machine to the human hand-arm system (HAS). To develop products with reduced health effects on humans, the vibration transmission should be accurately recorded and modeled. The Mechanical Impedance (MI) is used in product development to describe the vibration behavior of the HAS. The problem is that different types of excitations are currently used to determine the MI in the state of research, with experimental parameters that are not kept constant. The contribution of the present work is to examine the influence of these different types of excitations on the MI of the human HAS, while keeping the experimental parameters, such as excitation force, grip and push force combinations, and frequency range constant. In a comparative study, a measuring handle was translatory excited with four different types of excitations commonly used in research (single sine, multi-sine, sweep and random noise). The measurements were carried out according to a full factorial experimental plan with five subjects under varying grip and push forces. The results show a similar progression between the deterministic single sine and the sweep. ... mehrThe multi-sine signal is below both these curves. The random noise signal is positioned clearly below these curves. The results make it possible to compare the influence of the type of excitation on the MI of the HAS with the state of research and to set a benchmark for future studies. The curves differ significantly from one another, particularly in terms of qualitative values. When applying MI in the future, attention should be paid to the type of excitation and the amplitude height. Otherwise, significant deviations may occur in the design of products during product development. This influence should be included in existing standards.