Research on Rotational Resistance Moment of Rotary Energy Recovery Device Ang GUO, Zuo-dong HUANG, Zai-ran DING, Yi SHI, Lei JIAO and Jian-xing LENG E3S Web Conf., 53 (2018) 02001 Published online: 14 September 2018 DOI: 10.1051/e3sconf/20185302001