Implementation of Dynamics Balancing of Double-Disk Hollow Shaft Rotor System: Modal Balancing Approach Results

  • Ala’a M. Al-Falahat
Keywords: Rotor balancing, Rotor shaft, Numerical method, Composite shaft, Critical speed

Abstract

Balancing plays an important role in rotating machinery that is widely used in many engineering fields, especially in high-speed rotor-bearing systems. In this present study, the mass balancing method of the hollow shaft made from composite materials is implemented for the whole speed range of the rotor. The main purpose of the balancing procedure to produce a smooth operation machine to get rid of the commonalty unbalance mass by applying compensating mass unbalance which results in a smooth operation in the machine. However, the complete elimination of the mass unbalance is usually impossible and unnecessary because the unbalance mass distribute along the rotor length. In the meanwhile, MATLAB code is built to develop a functioning of the mathematical modelling of the rotor-bearing system. the finite element model of the unbalanced rotor-bearing system is proposed, to set the balancing mass of the composite hollow shaft at a selected speed rotor that allows to balance one critical speed at a time to minimize the vibration response amplitude of the rotor as much as possible with minimal impact on the rest of the imbalance response within the speed range of interest. The proposed finite element model is assembled by selecting 7 nodes on the rotor-bearing model to improve the accuracy of the simulation results and increase the degree of freedom of the model. As a result, this work confirms the procedure of distributing unbalance in the modelling balancing to balance the flexible hollow shaft having an unbalanced mass for the entire speed range of the shaft. In this method, balancing the hollow shaft at the critical speed was observed and the vibration amplitude was calculated by added additional mass at a selected angle.

Published
2021-08-07
How to Cite
Ala’a M. Al-Falahat. (2021). Implementation of Dynamics Balancing of Double-Disk Hollow Shaft Rotor System: Modal Balancing Approach Results . Design Engineering, 7007- 7015. Retrieved from http://www.thedesignengineering.com/index.php/DE/article/view/3218
Section
Articles