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Abstract. In this paper, the friction characteristics of cylinder are studied based on the Stribeck friction model. By building the cylinder friction test rig, the experimental friction-velocity maps of the cylinder is obtained and the influence of the piston linear velocity on the friction force was studied. The friction force fitting model of the cylinder system was obtained by using the obtained data. It can be used to characterize the actual friction force, which can provide the definite reference value for the cylinder friction force in the process of the system work, and is an important step to friction compensation in the control system.

By the use of filtration experiment system with single ceramic tube, cold experiment and numerical simulation was carried out about the dust removal process. The experiment shows that airflow conforms to the linear Darcy law, the pressure drop increases with the increase of filtration velocity and dust load; with the increase of gas pressure, the permeability of porous ceramic decreases. Simulation shows that velocity and pressure drop values increase along the axial height from bottom to top and reach the maximum at the exit. Due to the differences of gas velocity or particle size, the amounts of sedimentary particles are different at the tube wall, larger velocity and smaller size particles trend to be more equispaced when they are trapped on the surface of tube.