Design Criteria for Torsional Virbation, Reciprocating Pump

Design Criteria for Torsional Virbation, Reciprocating Pump

This page shows a brief workflow how to proceed with torsional vibration analysis for Reciprocating Pump, and to apply the analysis criteria for design reliability.

 

1. INTRODUCTION

The main objective of this torsional vibration analysis is the calculation of the torsional natural frequencies and torsional mode shapes of the entire train. The calculated torsional natural frequencies are plotted in a Campbell diagram versus all existing excitation frequencies. In case the torsional resonances are calculated to fall within specified separation margins, a stress analysis is performed to demonstrate that there is no adverse effect on the entire train. This torsional vibration analysis was performed as per flow chart shown in below;

 

[ Workflow for Torsional Vibration Analysis ]

 

2. DESIGN CRITERIA

Torsional vibration analysis for this pump is carried out as per separation margin requirement as shown in below paragraph.

 

2.1  Separation Margins

A separation margin of +/- 10% obtained is satisfactory to avoid unacceptable torque response amplification for the train shaft in order to design robust pump mechanical design.

 

2.2 Torque Response Analysis 

In case torsional resonance are estimated to fall within the separation margin (+/-10%) of operating speed, the steady state torque response shall be performed to demonstrate that the potential resonance have no adverse effect.

 

 

[ Model for Reciprocating Pump, Crankshaft ]

 

 

 

[ FEM for Reciprocating Pump, Crankshaft ]

 

 

VDI3842 Vibration

VDI 3842, Vibration in Piping System (June, 2004)

 

 

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