Biomedical Engineering Reference
In-Depth Information
Fig. 6.35 a Car seat A D
AIMLER
E-Class, b car seat B, c airplane seat A with foam core (R
ECARO
Aircraft) and d airplane seat B with fabric lining (R
ECARO
Aircraft)
6.3.4 Interaction FE-Analysis Comprising Body-Seat-Systems
(BSS)
The interactive behaviour of the contact points, i.e. car or airplane seats and seated
B
OSS
-Models was analyzed solely based on their elastic material properties
(
Sect. 6.2.5
). The material parameters employed were established on the experi-
mental force-displacement data constituting the region of equilibrium elasticity
(cf.
Sects. 4.2.2
and
5.2.3
). The working hypothesis regarding comfort, (biome-
chanical hypothesis) described in
Sect. 3.5
, was that higher sitting comfort
corresponded to lower normal or direct mechanical tissue shear stress (and/or
normal or direct strain and shear strain), particularly at the ischial tuberosity.
6.3.4.1 Elastic Body-Car Seat-Systems (E-BCSS)
Increasingly, aside from safety and economy, customers are demanding additional
seat comfort. Also, it has been demonstrated that long distance driving
performance is impaired if body posture is inappropriately supported. From an
ergonomic point of view an automotive vehicle is not only a means of transport or
a consumer good but a work place as well. Certain design regulations must
therefore apply to the vehicle interior. Regulations regarding seat position design
have been developed by Helbig and Jürgens (1977) and are noted in the reference
work for standardization (DIN 33 408).
In
the
following,
the
body-car-systems
subsequently
listed
are
used
in
mechanical interaction FE-analysis
Elastic Body-Car Seat-Systems (E-BCSS) 1: Car seat A and BoMo8 (male model),
Fig.
6.36
a
• E-BCSS 2: Car seat A and BoMo12 (female model), Fig.
6.36
b
• E-BCSS 3: Car seat B and BoMo7 (male model), Fig.
6.40
a
• E-BCSS 4: Car seat B and BoMo11 (female model), Fig.
6.40
b
