What software to use for torsional vibration analysis ?

Asked by philyanko 5 years, 3 months ago | 1 Answers

I need to drive a water injection pump (SPS) with a gas engine.

The pump has a 10 m long shaft and the gas engine power is rated 700 kW @ 1800 RPM.

How to calculate that the pump shaft will not twist during these 3 stages :

- from start-up to firing : 0 to 130 RPM (electric starter reaching 130 RPM in 5 sec.)

- from firing to idle speed : 130 to 300 RPM. One suggests a 30 sec. ramp up.

- from idle speed to full speed : 300 to 1800 RPM

As the application is water lift, there is no specific duration to reach the nominal speed.

1 Answer

Normandy 4 years, 7 months ago
Not sure how to assist in calculating what you're looking for but I have seen Siemens tests the engine and driveline efficiency. They study power transmission systems using rotating shafts and couplings, and is therefore important to turbo-machinery manufacturers and integrators as well as makers of marine drivelines. Here are some formulas that can help determine the twist and measurement of the relative-angle deformation between two separate locations on the shaft. T = (GJ)(Δα) / L J = (ᴫR­4) / 2 G = E / [2(1+ ν)] Where: T is the torque GJ is the torsional stiffness (G is the shear modulus, J is the torsion constant or the polar moment of inertia) Δα [rad] is the angle of twist, or twist angle L [m] is the length of the shaft R is the radius of the shaft E [GPa] is the Young’s modulus ν is Poisson’s ratio