P.O. Box 137;
School of Astronautics;
Harbin Institute of Technology;
Harbin 150001;
China;
Department of Mechanical Sciences and Engineering;
Tokyo Institute of Technology;
2-12-1;
O-okayama;
Meguro-ku;
Tokyo 152-8552;
Japan;
Institute of Engineering Mechanics;
Beijing Jiaotong University;
Beijing 100044;
China;