Dynamic Characteristic Analysis of Hydraulic Servo System in a Mold Oscillating Mechanism

Abstract:

In this study, a hydraulic servo system for mold oscillating mechanism was investigated. In order to check the efficiency and the stability of system, its geometrical designs, which change the natural characteristic of system, including a spool volume, area of piston, and so on were analyzed by a non-linear model. The model was composed of the equation of orifice, the continuity equation, and the force equilibrium including a variable effective bulk modulus belonging to operating oil, gas, and cylinder. All simulations were conducted by the MATLAB SIMULINK, and simulated as specific conditions corresponding real operation conditions in the steel industry. According to the analysis, the relation between a controller, servo design, and system performance was investigated with physical means. And, the fact that not compared to other design variables, the entrance shape on spool was dominant to determine the stability and the performance of system, was found. Furthermore, a fault detection method, and optimization problem including this work were discussed.

• Periodical: Advanced Materials Research (Volumes 1025-1026)
• Pages: 183-191
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1025-1026.183
• Online since: September 2014
• Authors: Yong Hui Park, Hyun Chul Park*
• Keywords: Effective Bulk Modulus, Feedback Control, Hydraulic Servo Controller, Mold Oscillating System, Non Sinusoidal Waveform, Orifice

References

[1] S.D. Kim, K.H. Kim, J.S. Song, Y.B. Ham and J.C. Lee: J. Korea Soc. Fluid Power & Constr. Equip. Vol. 3, No. 1 (2006), p.7.

[2] D.H. Kwak, G.S. Cho, B.H. Jung, and J.K. Lee: J. Control, Auto. Syst. Engin. Vol. 9, No. 6 (2003), p.435.

[3] D.T. Kim, K.S. Park: J. Korea Society of Fluid Power & Constr. Equip. Vol. 3, No. 2 (2006), p.14.

[4] T.H. Kim, I.Y. Lee: J. KSME, Vol. 27, No. 5 (2003), p.789.

[5] X. Zhang: Adv. Engin. Forum Vol. 2-3(2012), p.53.

[6] I.Y. Lee, D. Sun: Transaction of KSAE, Vol. 12, No. 5 (2004), p.187.

[7] W.J. Thayer: Specifications Standards for Electohydraulic Flow Control Servo-valves, (Technical Bulletin 117, Moog Inc., East Aurora, New York 1962).

[8] S.N. Yun, Y.B. Ham and J.D. Jo: J. KSPSE. Vol. 7, No. 1 (2003), p.68.

[9] J.C. Lee, Y.S. Cheong: Transaction of the Korean Society of Automotive Engineers, Vol. 11 (2003), No. 1.

[10] X.Z. Zang, X.R. Zheng, Q.G. Liu, X.K. Li and Y.M. Fang: Int. J. Iron and Steel Res. Vol. 20, No. 12 (2013), p.19.

[11] G.P. Kang, G. Shin, C.C. Kang: J. Mech. Sci. Tech. Vol. 21, No. 3 (2007), p.421.