Abstract
A fluidic one-shot-multivibrator is composed of a wall attatchment element and a delay element. To analyse and design such fluidic digital circuit, we must know its transient behavior. But, the method for analyzing it taking into account both the static and dynamic characteristics of the wall attachment element has not yet been well-established.
The purpose of this paper is to propose a method for analyzihg the transient behavior of such a circuit by the computerized method of characteristics. We investigate the method for estimating the boundary conditions and the switching delay time of a wall attachment element for a ramp control input. Based on the results of estimation, we calculate the transient response and the output pulse width of an one-shot-multivibrator, and compare them with the experimental ones.
As a result, the following is concluded.
1) The method of characteristics is very useful for analyzing the transient behavior of the complex fluidic circuit with branches, having nonlinear or varying boundary conditions, and so on.
2) The switching delay time of a wall attachment element depends on the rising of the control input. And the time required for the element to be switched after the control port pressure reaches its static switching level is nearly inversely proportional to the time derivative of a control port pressure at its static switching level.
3) When the static and dynamic characteristics of the wall attachment elements that constitute an one-shot-multivibrator are given, we can calculate with sufficient accuracy the output pulse width of the curcuit with any restrictor and capacitor by the above method.
