Using Substructuring to Predict the Human Hand Influence on a Mechanical Structure
Substructuring methods have been widely used on mechanical structures to study and improve the dynamic behavior of complex assemblies by analyzing the behavior of each substructure separately. Substructuring methods can potentially be used to create a functional link between the dynamic behavior of the human body and mechanical structures in order to enhance the interactions between the body and these same structures. Keeping in mind that significant amounts of vibrations are transmitted to the body from contact with vibrating structures – human-structure coupling interactions could be used as a way to study components of comfort during vibration exposure, and even with the goal of preventing injuries caused by transmitted vibration.
This paper investigates a coupling between a straight beam and the hand-arm system which is a non-linear structure. Each structure is characterized by experimentally obtained mechanical mobility Frequency Response Function (FRF) data over a frequency range between [5, 300] Hz. The FRF Based Substructuring method (FBS) allows coupling through the interface set of substructures. This links mechanical structures with the human body where only interface measurements are gathered. The FBS method is used to predict the dynamic behavior of the assembly.
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