^pKey;
Laboratory;
of;
Advanced;
Design;
and;
Manufacturing;
for;
Vehicle;
Body,;
Hunan;
University,;
Changsha;
410082,;
China;
^pof;
Applied;
Mechanics,;
Chalmers;
University;
of;
Technology,;
Gothenburg;
41296,;
Sweden;
^pof;
Mechanical;
Science;
and;
Engineering,;
Nagoya;
University,;
Nagoya;
464-8601,;
Japan;