Abstract: A new two-degree of freedom mass-spring-dampn- ess system model for studying stick-slip is established. Based on the dynamics system describing of the model, mathematical expression of the state parameter is presented, and the relation between stiffness (horizontal, vertical), dampness, mass, difference of static and kinetic coefficient of friction and state parameters of stick-slip is analyzed, which proves that stick-slip can be reduced by improving horizontal stiffness, decreasing dampness, reducing mass, cutting down the difference of static and kinetic coefficient of friction, properly choosing the vertical stiffness and properly controlling the vertical swing can reducing stick-slip. At a same time an experimental exemplification is showed that the results of simulation is correct.

Key words: Physical model, Status parameters, Stick-slip