About the Authors

J. Zhang

Contributed equally to this work with: J. Zhang, Z. Liang

longmenshao@163.com

Affiliation School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China

Z. Liang

Contributed equally to this work with: J. Zhang, Z. Liang

Affiliation School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China

C. J. Han

Affiliation School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZL CJH. Performed the experiments: JZ. Analyzed the data: JZ. Contributed reagents/materials/analysis tools: JZ. Wrote the paper: JZ ZL.