1. School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316022, China
2. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
3. Ocean College, Zhejiang University, Zhoushan 316021, China
4. Laboratory of Polymers and Composites, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China