Optimization of low frequency balancing of GD-40 rotor

Abstract

Problem solutions connected with rotary vibration decrease issues are based upon a linear
vibration theory. The theory also points out main vibration control measures: vibration
isolations, damping, dynamic damping, decreasing the amount of driving force. One of the
examples of the last mentioned is rotor balancing, particularly low-speed balancing. A lowspeed rotary balancing is a fulfillment of a condition of a rotation axis passing through its centre of mass and compliance of a rotation axis of a rotary with one of its main inertial axes.
Recently rather compact low frequency balancing machines of BM series, named “Morion”,
allowing static and instant balancing of rotary mass up to 3 kilos have appeared in Russia.
The machine is placed on the table.
Such machines have found use during rotary balancing of turbines of internalcombustion
engines and gas-turbine engines, as the production of such rotors is large and each item is needed to be balanced.
The aim is to determine the extent to which the introduction of a third plane correction in
a given cross- section increases the efficiency of the available low-frequency balancing on the balancer “Morion”.
The project addressed the following questions:
• Building a computational model of the rotor GD-40;
• Determination of natural frequencies and forms of the spinning rotor;
• Develop and probabilistic reasoning – a statistical model of the rotor unbalance shaftmounted design;
• Study the effectiveness of balancing systems using different corrective masses;
• Use a 3-plane balancing in practice;
• Analysis of influence of the correction planes.