Rotor optimization design for crosshead friction pair of model BWY-220/9 mud pump
In order to solve the crosshead friction pair problem of poor wear resistance in Model BWY-220/9 mud pump,this paper analyzed the affluence of different materials and gap sizes to friction loss of crosshead friction pair by using finite element software.According to the analysis results,this paper proposed an optimization design for crosshead friction pair and manufactured a new friction pair.The experiment shows that the new crosshead friction pair has less friction loss and the no apparent oil contaminated.Furthermore,the friction heat is reduced and the overall property of Model BWY-220/9 mud pump is promoted.Therefore,the affectivity and reliability of finite element analysis is also verified.The method proposed in this paper can be applied to optimization design for crosshead friction pair of other mud pumps.
The aim of this paper is first to introduce and study Rota-Baxter cosystems and bisystems as generalization of Rota-Baxter coalgebras and bialgebras, respectively, with various examples. The second purpose is to provide an alternative definition of covariant bialgebras via coderivations. Furthermore, we consider coquasitriangular covariant bialgebras which are generalization of coquasitriangular infinitesimal bialgebras, coassociative Yang-Baxter pairs, coassociative Yang-Baxter equation, double coalgebras and dendriform coalgebras. We study some of their properties and relationships with Rota-Baxter cosystems and bisystems.