rotor balancing procedure

To improve the balance condition of most high speed flexible rotors, the following procedure is generally followed: 1. Balance the bare shaft without added components a. Assure that any

Primary Balancing describes the process where primary forces caused by unbalanced mass components in a rotating object may be re­ solved into one plane and balanced by adding a mass in that plane only. This is known as Static Balancing as the object would now be completely balanced in the static condition (but not necessarily in dynamic).

To improve the balance condition of most high speed flexible rotors, the following procedure is generally followed: 1. Balance the bare shaft without added components a. Assure that any keyways are fitted with half keys in accordance with ISO 8821 unless two keys are located at the same axial position and are 180⁰ apart 2.

In this research, a single-plane balancing method based only on vibration evaluate the validity of his balancing procedure on a test rig rotor.

Disk-shaped rotors usually can be treated with static balancing. to repeat the balancing procedure to obtain a satisfactory result.

Field balancing is the technique of balancing rotors in place as they are allowed to run at their typical operating speed with minimum disassembly. This technique can be used when the rotor is accessible to make corrections. When certain fans and blowers are enclosed and inaccessible, field balancing is not an option.

The principle of performing field balancing is to make (usually tempo­ rary) alterations to the mass distribu­ tion of the rotor, by adding trial masses, and to measure the resulting phase and magnitude of bearing vibra­ tion. The effects of these trial correc­ tions enable the amount and position of the required correction mass to be determined.

The only way to assess the unbalance state is to add balance correction weights at various locations and using some calculation tool such as the influence.

The balancing itself is performed by spinning the rotor and reading the data from accelerometers installed on the supports and the data from a sensor that detects a specific spot on the rotor. The

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Balancing of the rotor is therefore necessary to accomplish any of the following: • Reduce vibration • Increase bearing life • Reduce structural stresses • Reduce noise • Improve the quality of the product III. CAUSES OF UNBALANCE Manufacturing processes are the major source of unbalance.