SU752228A1 - Pneumatic regulator - Google Patents

Description

(through the throttle adder 5) the equilibrium of the reference element was restored

 - p (n zd) T

Where

/ X 1 +

rk. -

- regulator gain factor; a, P is the conductivity of the corresponding variable-variable variable chokes of the adder 5. Thus, by means of the choke adder, it is possible to adjust the controller's amplification factor within

from/((

;50.

The integrating effect of the regulator is achieved by introducing a combination of a single positive and non-integer negative (via throttle adder 5) retarded connections — opening throttles 2. If the change in input pressure disrupts the equality Pn Dcc, the pressure PBA at the regulator's output also changes at variable choke 2 multiply the pressure drop P, determined by the magnitude of the mismatch and the setting of the throttle adder 5.

DR.-Lr (R „-Yazd).

At the same time, the pressure in the tank 3 will also begin to change at a speed approximately proportional to the AP, and the magnitude of the coefficient of proportionality is determined by the degree of opening of the throttle 2. As a result, the output pressure changes until the proportional gain is restored in the closed system.

RP RPZD.

Thus, in the first approximation, the proposed controller implements the nornornormal-integral law.

A more rigorous analysis of the circuit and dynamic features of the controller (taking into account the inertia of the choke adder) shows that the refined transfer function of the controller has the form

, (5) Dr. / «+ 5 (7

X

V I P t S 4- 1 1

X 1- a "3-f- 1

Vp /

Where

V

RB-f

the time constant of the link “choke 2 – capacitance 3 (7 is the conductivity of droplets 2, V is the volume of chamber 3);

V,

Vt

T,

P

Kq

Rqa

cameras

compare 7

t -

Gd

It is easy to show that, in comparison with the prototype, in the proposed controller, the influence of dynamic misalignment is much less pronounced: its area of work is in another direction, and the ballast link has a positive phase shift, which additionally creates the effect of direct precaution.

Claims (2)

1. Instruction for the operation of the pneumatic proportional-integral controller type PR3.21, Tizpribor, 1970. 2. Steinberg, Sh. E. et al. Industrial automatic controllers. M., “Energie, 1973, p. 316, fig. 9-4 (prototype).