Frequency Characteristics of Cylindrical Chokes

Abstract

An experiment was carried out on cylindrical chokes with unnegligible inlet length for the purpose of clarifying their dynamic characteristics. The results were compared with the analytical solutions derived with use of the equivalent viscosity. In the experiment the frequency response was obtained on various chokes with spring loads at their outlet, where the fluctuating pressure at the choke inlet was taken as the input, and that at the outlet and the piston displacement as the output. Further the analysis was extended to the case of two chokes connected in series. The test results showed good agreement in a comparatively wide frequency range with the analytical solution of the equation linearized on the basis of the equivalent viscosity, and the solution was found to give characteristics similar to the first order system. In addition it is pointed out that the characteristics of two chokes in series can be obtained as in the case of single choke by solving the fundamental system equations expressed with use of the equivalent viscosity.