Key;
Laboratory;
for;
Strength;
and;
Vibration;
of;
Mechanical;
Structures(School;
of;
Aerospace;
Engineering,;
Xi'an;
Jiaotong;
University),;
Xi'an;
710049,;
China;
of;
Mechanical;
Engineering,;
Faculty;
of;
Science;
and;
Technology,;
Tokyo;
University;
of;
Science,;
Chiba;
278-8510,;
Japan;