DYNAMIC CHARACTERISTICS OF OIL HYDRAULIC PRESSURE CONTROL VALVES

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概要

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• Oil-hydraulic control valves sometimes become unstable if they are not well-designed. It is often experienced that the stability limits of the unstable phenomena depend on the characteristics of disturbances. However, the threshold of stability limit has not yet been clarified by using only the usual linear theory which is inadequate to consider the nonlinearity of the phenomenon. In this paper, the stability limits of the oil-hydraulic systems with spool-type pressure control valves are investigated both experimentally and theoretically, under conditions of sinusoidal disturbances with various combinations of amplitudes and frequencies applied to the systems. It is found that the nonlinearity of Coulomb frictional force acting on the sliding surface of the valve spool is one of the main causes of the specified stability of the system. Furthermore, the effects of valve configuration, rate of flow, and pipe length on the stability limit are clarified.

• 一般社団法人日本機械学会の論文

著者

• Kojima Eiichi

  Kanagawa University.

• Tanaka Hirohisa

  University Of Tokyo

• ISHIHARA Tomo-o

  Institute of Industrial Science, University of Tokyo.

• Ishihara Tomo-o

  Institute Of Industrial Science University Of Tokyo.

• Ishihara Tomo-o

  Institute Of Industrial Science University Of Tokyo

関連論文

• DYNAMIC CHARACTERISTICS OF OIL HYDRAULIC PRESSURE CONTROL VALVES
• Volume-averaged Expression of Two-phase Flow

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