Studies on the Hydroulic Oscillators : 2nd Report, Experimental Analysis

Abstract

This paper presents the experimental results and analyses on the vibratory characteristics of the hydraulic oscillator which utilizes the self-excited vibration phenomenon occurring in valves such as a spool valve or a poppet valve. Experiments on the two improved forms of the hydraulic oscillator - an oscillator with saturation restoring torque and one with reinforced hydraulic restoring torque - were carried out by systematically varying the factors affecting the vibratory characteristics. The vibratory characteristics having the frequencies in the range of 14 to 85 Hz and the angle amplitudes in the range of 10 to 34 degrees were obtained in this experiment. By comparing the theoretical vibratory characteristics presented in previous report with the experimental ones, it became clear that they almost agreed in the relation of the frequency to the angle amplitude, and available data for the design of the hydraulic oscillator were obtained.