1969 Volume 35 Issue 418 Pages 738-745
A pneumatic micrometer system with both a hybrid pressure cascade connection and a linear feedback was previously proposed, and its experimental performance was reported by the present author. This paper is concerned with static transfer characteristics of the pneumatic circuit with the hybrid pressure cascade connection, the forward circuit of the system of which acts as the non-linear part of the static transfer characteristics of the system. The static characteristic expression of the circuit is shown as a function of the initial operating pressure of the input stage P01, coupling transducer gain Kg and compliances between the measuring nozzles and their counter-faces, and the effect of these factors on the transfer characteristics or the linear ranges is discussed with a concrete circuit. The results obtained are summarized as follows, 1) the smaller Kg is selected and the lower P01 is selected, the linear range on the characteristic curve displaces toward the high pressure side, 2) the larger the compliance between the measuring nozzle and its counter face in the output circuit is, the linear range displaces toward the low pressure side, 3) the effect of the measuring force in the input stage upon the transfer characteristic curve is negligible small, 4) the larger the gain Kg is selected, the less the variation of the measuring force over the output pressure range becomes.
