David — A Multybody Virtual Dummy for Vibrational Comfort Analysis of Car Occupants

Whole-body Vibratory Response Study Using a Nonlinear Multi-body Model of Seat-occupant System with Viscoelastic Flexible Polyurethane Foam

“…Also, they are able to describe the effects of global deformations with high computational efficiency as compared to finite-element models and do not need as many inputs. Despite their advantages, multibody models, especially in more than one dimension, have not been used widely, though there are a few models described in the literature, such as those developed by Nishiyama [5][6][7] Cho and Yoon 8) , Kim et al 9) , Matsumoto and Griffin 10) , Yoshimura et al 11) , Valentini and Vita 12) , Teng et al 13) , and Verver et al 14,15) . The dynamic response of a seated human is affected by a number of conditions, such as hand position 16,17) , pos-ture [17][18][19] , foot support 16,17) , position of the occupant, and most importantly, back support [17][18][19] .…”

Using a Virtual Dummy to Simulate Vibration Dose Value for Different Car Occupants

“…In particular the overall VDV has been evaluated for different backrest inclinations and different human kinds (varying the height and weight percentile). The code used is the in house developed DAViD [3,4]. This code is able to manage multi inputs in terms of acceleration, velocity and position time histories.…”

“…The output files for each rigid body of the system under investigation are position, velocity and acceleration of the centre of mass. Moreover the code evaluates the overall VDV, in accordance with the BS 6841, and the time exposure 2 For more details of the virtual dummy multibody model refer to [3,4] for each car occupant. In the simulations scenarios herein reported the multi inputs applied represent an highway path at the constant speed of 100 km/h.…”

“…This research unit is involved in the vibration comfort analysis of car occupants [3,4,5,6]. The code developed, named DAViD (Dynamic Automotive Virtual Dummy), is based on a multibody approach.…”

“…It [3,4]. In this paper the influence of the anthropometric features (height and weight) and the inclination of the backrest on the VDV has been investigated.…”