LDi Catalog Printable PDF32

Predict valve, membrane, & liquid mass motion, responses to flow from reciprocating pump action, to generate the pressure pulsation.
Ex: Initial choice, outline of equations, for compiling a fortran "dt" iterative display for motions & resultant pressure pulsation.
Note, in this primitive skeletal outline example of LDi method, position numbers: D, G, L, P, & V, 00, 01, 02, 03, 04, etc. are aspg. 29.

Assumption in this example are: That there is no vortex or other instability at system inlet, and that the system load, is not applied by a "spill back loop" or a "controller" that "modulates" open and closed.

1.		Suction Source, Load	Ref.
2.		Suction Manifold Inlet Flow	A
3.		Suction Manifold Outlet Flow	A
4.		Suction Manifold Pressure Balance	B
5.		Suction Check Inlet Mass Flow	A
6.		Suction Check Pocket Flow Balance	B
7.		Suction Check Motion	C
8.		Piston Position	A
9.		V11 Flow Balance	B
10.		V11 Volume Change
11.		Load
12.		Discharge Check Inlet Mass Flow	A
13.		Discharge Check Motion	C
14.		Discharge Check Pocket Flow Balance	B
15.		Discharge Check Outlet Mass Flow	A
16.		Discharge Manifold Pressure Balance	B
17.		Discharge Manifold Outlet Mass Flow	A

References: A. Pump Handbook, 2nd Ed. Karassik eq 38., p.3.8. B. Mechanics of Fluids, 6th Ed. Massey eq 13.14 & 13.16 C. Handbook of Noise & Vibration, 6th Ed. Barber, M.I.T. 1960 Library of Congress Cat Card Nbr 59-6759 E&OEE

Whilst LDi PulseView software also displays "acoustics", it is primarily a mass, motion, & pressure model - not an attempt to determine them from "acoustic" frequencies and amplitudes.