Reduced order modeling of preloaded bolted structures in multibody systems by the use of trial vector derivatives

In order to achieve a correct representation of jointed structures within multibody dynamic simulations an
accurate computation of the nonlinear contact and friction forces between the contact surfaces is required.
In recent history trail vectors based on trial vector derivatives, so-called joint modes, have been presented
which allow an accurate and efficient representation of this joint contact. In this paper a systematic
adaption of this method for preloaded bolted joints is presented. The new strategy leads to a lower number
of additional joint modes required for accurate result and hence to lower computational time. Further a
major reduction of the computational effort for joint modes can be achieved. The potential and also
possible limitations of the method are investigated using two numerical examples of a preloaded friction
bar and a bolted piston rod bearing cap.