Increase of energy efficiency and competitiveness of mechanical systems on the basis of anisotropy of nonlinear frictional bondsVladimir Shapovalov, Petr Shcherbak, Roman Kornienko, Vasilij Mishchinenko and Valentina FeizovaE3S Web Conf., 104 (2019) 01003DOI: https://doi.org/10.1051/e3sconf/201910401003