Piping network analog apparatus

Claim 1

An electrical analog of a piping network having a centrifugal compressor or pump therein comprising: (a) a capacitor pump for simulating the pumping action of a centrifugal compressor and having circuits connected to its input and output simulating the piping upstream and downstream of said compressor: (b) means for applying voltages to the input and output of said capacitor pump which are proportional to the suction and discharge pressures of said compressor: (c) and electrical means for driving said capacitor pump to cause it to simulate the action of the centrifugal compressor in said piping network including: i. means for scaling a constant voltage by a fourth factor A ii. first means for sensing the suction voltage, iii. means for scaling the output of said first means by a first factor (B-1) iv. means for sensing and scaling the current flow through said capacitor pump by a second factor ##EQU4## v. means for squaring and scaling said current flow respectively by a third factor D vi. means for multiplying the suction voltage by the current and means for scaling the result by a fifth factor E; and means for adding the outputs of items (ii), (iii), (iv), (v) and (vi) to provide a sum voltage Eb; and means for generating a sinusoidal voltage having an ampitude proportional to said sum voltage as the driving voltage for said capacitor pump.