Design and Experimentation of New Balancing Technique Based on the Jeffcott Rotor Model

Unbalance is one of the most common causes of machinery vibrations, present in rotating machines. The influence coefficient method of balancing used for in-situ balancing requires vibration data (Phase angles and vibration values) of many trial runs which may result in a lengthy balancing process. The vibration data can be measured with the help state-of-the-art four channel Adash 4400 VA4 Pro FFT analyzer platform along with data acquisition system and electronic instrumentation. It has been identified in the literature that it is possible to balance the rotor without the use of trial weight. This paper presents a new systematic approach of balancing method based on the Jeffcott rotor dynamic model. The mathematical model on Jeffcott rotor model is presented here. The proposed method requires vibration data of two test runs at different speeds without trial weight. For experimental verification of proposed method, a test rig has been developed. Systematic experiments done on the Jeffcott rotor model at different rotating speed are described in this paper. The experimental results shows the success of proposed balancing method. The importance of identifying type of rotor unbalance (static, couple, quasi-static, or dynamic) and the method to detect type of unbalance present in the rotor is presented.