Abstract
In fluidic digital circuits using wall attachment amplifiers, branch line systems are often used. The pressure wave form at the input port of a downstream element differs according to constructing conditions of line system such as position of branch point, the diameter of tubes, etc. So it is necessary to design the line system so that the desirable wave form might be transmitted.
In this paper, first we discussed the change of pressure wave due to reflection and transmission at branch point and end points by using the lossless line model and the method of characteristics. It was found that the change of pressure wave was given by the product of reflection and transmission coefficients and this relation was expressed by a simple diagram. The outline of transient response can be obtained easily from this diagram.
Next we discussed the actual conditions about the diameter and the length of tubes to get desirable wave form by using a practical example.
Last, transient response was calculated by applying the quasi-method of characteristics to the line model which considered viscosity and heat transfer. Experimental pressure wave forms were measured and compared with calculated results. The validity of discussions about conditions of line system was verified and usefulness of calculation was confirmed.
