Abstract
Dynamic characteristics of the newly developed impingement type differential amplifier have been analyzed and tested. The configuration of the amplifier is that of the summing impact modulator with short spacing of opposing nozzles and symmetrical construction.
In dynamic tests, sinusoidally changing supply pressure difference has been produced by a newly devised piezoclystal flapper-nozzle differential valve.
The dynamic characteristics of the supply lines, nozzles, impinging jets, flow after impingement and the output ducts of the amplifier have been analyzed by lumped parameter approximations.
Main factors which govern the dynamic characteristics were elucidated as the resonance characteristics of the supply lines and the first order lag characteristics of the output ducts.
The tested model with the opposing nozzles of diameter 2.4mm has the first resonant frequency of around 300Hz caused by the supply lines, so that it can operate up to 200Hz.
