The Design of Follow-up Hydraulic Muffler Based on Spring-Damp Regulating Device Chang-ji Shan, Yi-duo Bian, Ting-ting Dai, Cai Yan, Guo-fang Du and Hai-tao Yang E3S Web Conf., 79 (2019) 01006 Published online: 15 January 2019 DOI: 10.1051/e3sconf/20197901006