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Modeling realistic grip force curves from hammer drill applications to determine mechanical impedance using a translational shaker system
Other Titles
Modellierung realitätsnaher Greifkraftverläufe aus Bohrhammeranwendungen zur Bestimmung der mechanischen Impedanz mit einem translatorischen Shaker-System
Publikationstyp
Conference Paper
Date Issued
2025-11-05
Sprache
English
Author(s)
First published in
Number in series
2463
Start Page
229
End Page
242
Citation
5. VDI-Fachtagung Schwingungen 2025
Contribution to Conference
Publisher
VDI Verlag GmbH
ISBN of container
978-3-18-092463-2
As part of this work, a study was conducted in which the statistical deviation of the grip force applied by the test subject was measured in comparison to the specified, time-varying grip force on an ISO standard grip. For example, these measurements were also taken under a multi-sine deflection of the ISO standard grip in the translational direction in order to initiate vibrations on the hand-arm system of the test subjects. The vibration behavior of the human hand-arm system (HAS) in response to external vibrations and grip forces can be described in the frequency range by the mechanical impedance (MI). The measured mechanical impedance then serves as a requirement parameter for the development of physical-dynamic hand-arm models (HAM). These hand-arm models can be used in product development to simulate human behavior and investigate correlations between technical products and human behavior without having to take real humans and their disturbance variables into account.
The central challenge is that many variables have an influence on the mechanical impedance of the HAS. In addition to interaction forces such as grip and push forces, their dynamic progression during a use case also has an influence. The app interface developed in this research project and its verification should make it possible to map this influence in both physical and virtual HAMs.
The results of the work show that the modeling and graphical representation of dynamic grip forces and their measurement work in a statistically significant way. The 13 test subjects were able to follow the complex, changing grip force curves with a maximum error of 16.16 N. It was demonstrated by way of example that the grip force curves can also be followed under translational excitation. This enables the measurement and recording of the passive behavior of test subjects with grip forces that change over time. The changing grip force curves can be measured in real-world applications. The resulting requirements, in turn, serve to develop dynamically adaptive hand-arm models.
The central challenge is that many variables have an influence on the mechanical impedance of the HAS. In addition to interaction forces such as grip and push forces, their dynamic progression during a use case also has an influence. The app interface developed in this research project and its verification should make it possible to map this influence in both physical and virtual HAMs.
The results of the work show that the modeling and graphical representation of dynamic grip forces and their measurement work in a statistically significant way. The 13 test subjects were able to follow the complex, changing grip force curves with a maximum error of 16.16 N. It was demonstrated by way of example that the grip force curves can also be followed under translational excitation. This enables the measurement and recording of the passive behavior of test subjects with grip forces that change over time. The changing grip force curves can be measured in real-world applications. The resulting requirements, in turn, serve to develop dynamically adaptive hand-arm models.
DDC Class
600: Technology
Funding Organisations
More Funding Information
This research is funded within the proposals “Dynamically adaptive impedance elements for influencing vibrations in validation environments” (530564503) and” Modelling and simulation of the vibration behaviour of hand-arm systems for six excitation directions in the context of user-centred product development” (527244581) by the German Research Foundation (DFG). The test equipment was partially supported through the funding of the DFG under proposal 275571425. The research results are the sole responsibility of the authors and do not represent the official opinion of the DFG.