Static and Dynamic Balancing of Rotating Machines | Dewesoft

Easy to use static and dynamic balancing tool for rotating bodies. Rich visualization and reporting functions. Download free evaluation software to start.

Rotor Balancing Rotor Balancing

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Overview

Static and Dynamic Balancing of Rotating Machines

Balanced rotors are essential for the smooth operation of rotating machinery. Unbalance will create high vibrations, reducing machine life and causing material defects. Our single and dual-plane balancing tool is a great tool to eliminate unbalance on-site reducing long down times.

IEPE

Charge

Voltage

Counter/Encoder

RPM

Acceleration

Main Features

SINGLE OR DUAL PLANE BALANCING ON SITE: Perform single plane (narrow disc) or dual plane (long shaft) balancing.
SIMPLE STEP-BY-STEP PROCEDURE: Users are guided through the balancing steps for flawless operation including easy setup of angle sensor with live preview. Multiple modules can be combined for multi-axis balancing to save time and greatly improve the quality of balancing.
RICH VISUALIZATION: Results from all runs are displayed for an easier decision for the next steps. Live visualization of unbalance vector is available to judge the stability of the measurement. RPM display has a colour indicator to easy determine in-out range.
WEIGHT SPLITTING: Adds possibility to split needed balancing weight into equidistantly spaced points, for example, holes on the rotor.
STORAGE OF INFLUENCE VECTOR: Influence vectors can be stored that the test run is not needed for repetitive balancing of the same machine.
LIFETIME FREE SOFTWARE UPGRADES AND SUPPORT: Our data acquisition systems come bundled with award-winning Dewesoft X data acquisition software. The software package is always evolving and new features are being added. We offer lifetime FREE software upgrades and technical support to all our users.

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Balancing Introduction

Balanced rotors are essential for most kinds of rotating machinery. Unbalance will create high vibrations causing material defects and reducing the lifetime of a material. Rotor unbalance is the major problem of vibration and it is related to the first order (rotational frequency).

The goal of balancing is to minimize vibrations related to the first order. Basically, it works like this: We measure the initial state, then we add a trial weight of the known mass, calculate the position and mass of a counterweight, remove the trial weight, and put the calculated weight on the opposite side, to cancel out the imbalance.

When an unbalance exists, the first order (rotational frequency) can be seen clearly. As shown in the example below, on the rotor exists an uneven distribution of mass. A correction weight is added (or material is removed) on the opposite side, which cancels out the major part. This procedure can then be repeated until satisfaction.

Depending on the machinery, single or dual plane balancing is used. Selecting one plane or two plane balancing generally depends on two factors. One of the factors is the ratio of the length of the rotor (L) to the diameter of the rotor (D). The other factor is the operating speed of the rotor. As a general rule of thumb, we can refer to the table shown below.

Step-by-step Balancing Procedure

Our balancing of rotating bodies tools acts as a sequence of three easy steps:

In step one, it records the actual status.
In step two it adds a trial mass.
In last step adds the calculated correction mass at the appropriate angle.

All three steps can be repeated if required.

In the left image on the top you see the current step, with an explanation which action has to be taken, on the right, there are the interactive buttons “Back”, “Next”, “Measure”.

The table will fill with the results after each step. The polar plot shows the vibration levels (amplitude and angle) of each run (the unit depends on the input, mm/s or mm/s² or g).

Single or Dual Plane Rotor Balancing

Depending on the machinery, single or dual plane balancing is needed. Selecting one plane or two plane balancing generally depends on two factors:

One of the factors is the ratio of the length of the rotor to the diameter of the rotor.
The other factor is the operating speed of the rotor.

Auto-generated Measurement Screen

When you have set up the balancing module in channel setup, there is an automatically generated display called “Balancing” in the measure mode.

This is the rotor balancer visual control, with channels automatically assigned from the math module.

Weight Splitting

When you have a rotor/plane with a certain number of slots/blades/holes, where the weights can be mounted, it would be much easier just to know the position number and split the weights instead of the absolute angle.

This can be done by selecting “Divide plane xx to xx” from the properties.

Link Multiple Instances

When amplitude and phase of the signal are not stable – you have to find a different location for mounting the sensor, to get a better signal.

To save time, you can mount multiple sensors and measure them at once, and then decide which signal to take. The whole procedure is the same, but you only need to operate one VC (visual control), all the other instruments will follow, of course providing different results.

Initialize with System Characteristics

If balancing was already done on a particular shaft, and the system characteristic is known, a trial weight run is not necessary once again; the system characteristics parameters can be entered manually instead, to get the correction mass calculated immediately.

This could be used if a shaft is balanced multiple times at a certain interval. The system characteristics describe the relation between mass and vibration.