About the Authors

Huaguang Gu

guhuaguang@tongji.edu.cn

Affiliation School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China

Zhiguo Zhao

Affiliation School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HG. Performed the experiments: ZZ HG. Analyzed the data: HG ZZ. Contributed reagents/materials/analysis tools: HG ZZ. Wrote the paper: HG ZZ.