抄録
Assume that the amount of pressure variation is represented by P, effective area by A, the stiffness of diaphragm by S1, the stiffness of the spring in the aneroid by S2, then the deflection of the aneroid (δ) is given as follows
δ=P.A/(S1+S2)
The effective area is independent of the numbers of capsules and the thickness of diaphragm material. In general, A is constant in the total range of deflection and can be calculated from the following equation
A=π.(d1+d2)(d1+d2)2/16
where d1 is the outer diameter and d2 is the inner diameter. For a fixed form of diaphragm, the stiffness of diaphragm is inversely proportional to the numbers of capsules and proportional to the √3th power of the thickness of diaphragm material.
