Rotor Balancing

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Rotor balancing

Rotor Balancing

An important consideration for proper operation and maintenance of all rotating equipment is dynamic balance. Balancing is the process of improving the mass distribution of a rotating element so that it rotates smoothly around its journal axis. An unbalance can cause noise, component wear, excessive vibration, loss of efficiency, component damage, and a reduction in bearing life. Maintaining a precise rotor balance quality is an integral part of keeping machinery vibration at acceptable levels, and, more importantly, is essential to minimizing mechanical stress and maximizing long-term reliability.

We have the experience to achieve precise balance results quickly and economically. Whether it is critical high-speed turbo-machinery or balance of plant machinery, we can get it running smoothly.

Because rotating unbalance is a common problem, balancing is often misapplied by other analysts when proper data analysis techniques are not used. We avoid this by starting with the correct transducer type for the machine and bearing design. Combined with single or multi-plane balance solutions, mode shape analysis, least squares analytical optimization, and graphical data analysis, we provide excellent quality balance results in short order, reducing downtime and maintenance costs.

Our extensive field experience ensures balancing is only performed when truly necessary. We analyze steady state and transient speed vibration data to assess the rotor’s on-line and resonance response characteristics. By analyzing rotor responses during both operating conditions, we can properly compensate data for the runout, thermal influences, and process effects that often affect the vector data, thus gaining accurate insight into the true dynamic rotor response.

To document the dynamic machinery responses, both ‘before’ and ‘after’ vibration data are provided as part of the project report. This data, in conjunction with the balance plane and weight information, is used to calculate the direct and longitudinal influence vectors. These influence vectors can be later utilized to expedite balancing,often allowing a “one shot” trim balance to be performed to quickly return a machine to operation.

As part of our methodology, all balance planes are graphically documented using AutoCAD. These ‘weight maps’ identify all existing weights found, all additions or modifications made to each balance plane, and the size and configuration of each weight type. The weight maps are an excellent reference for future maintenance.


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