Advances in Material Engineering and Mechanical Engineering by Edited by Liang Gao

By Edited by Liang Gao

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And it proved that the PWM valve have great prospects on the braking system. Introduction With the development of electronic technology and higher drilling requires, the hydraulic disc brake has widely applied on the oil rig as a new braking system since the first decade of new century [1]. In order to achieve the drilling automatically, the auto-drilling system which is composed of hydraulic disc brake and control system is developed and widely used. The hydraulic disc brake is the actuator of the auto-drilling system and its performance is very important for whole system.

Model of HDBS Controlled by the PWM Valve Model of Braking Process. The hydraulic cylinder controlled by the proportional valve is usually modeling by linear analyzing the flow though the port of the control valve. The flow though the PWM high speed on/off valve [3] automatically is linear the duty ratio of valve port at the pressure point [4,5,6]. The transfer functions of the two cases have the same type. The HDBS is controlled by the three-way high speed solenoid valve, which has three ports in the valve.

Hajdu, F. Deleruyelle, F. Besnus. Numer. Anal. Meth. Geomech, 2005, 29:941-970. [4] R. Desmorat, F. Ragueneau, H. Pham. Continuum damage mechanics for hysteresis and fatigue of quasi-brittle materials and structures[J]. Numer. Anal. Meth. Geomech, 2007, 31:307-329. [5] A. D. Jefferson, T. Bennett. Numer. Anal. Meth. Geomech, 2007, 31:133-146. Solids Structures,1982,18(7):551-562. [7] Tang C A,Yang W T,Fu Y F,et al. A new approach to numerical method of modeling geological processes and rock engineering problems-continuum to discontinuum and linearity to nonlinearity[J].

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