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20 Jun 2024 - 06:33 pm

Contents
1. Static vs. dynamic balance
- Static Equilibrium
- Rotational Balance
2. Dynamic Shaft Balancing Instruction
- Photo One: Initial Vibration Data
- Image 2: Adding Calibration Weight and Measuring Vibration
- Third Photo: Moving Calibration Weight and Re-Measuring Vibration
- Image 4: Installing Final Weights and Balance Check
3. Angle Measurement Process for Corrective Weights
4. How to Calculate Trial Weight Mass
5. Correction Planes Relative to Installed Vibration Sensors
6. Two-Plane Dynamic Balancing of a Fan
- Installing Sensors and Determining Planes
- How to Balance
- How to Measure Angles

Static and dynamic balance comparison

Non-Dynamic Balance
https://vibromera.eu/wp-content/uploads/2024/03/?????_statika-1024x549.jpg

In the first image, the rotor shows static imbalance, where the center of gravity is offset from the axis of rotation, creating a one-sided force that pulls the rotor to position its heavier side down. This imbalance is corrected by adding or removing mass at specific points to make the center of gravity coincide with the rotation axis. When the rotor is statically imbalanced, turning it 90 degrees always makes the "heavy point" go downward.

Stationary unbalance:
- Takes place when the rotor is at rest.
- Gravity pulls the heavy point of the rotor downward.

Stationary balancing: Used for narrow disk-shaped rotors. It eliminates uneven mass distribution in one plane.

Active Balance
https://vibromera.eu/wp-content/uploads/2024/03/long-rotor-1024x549.jpg

In the second photograph, the rotor is dynamically imbalanced with two separate mass displacements in different planes. This not only leads to a one-sided force like static imbalance but also generates moments that create extra vibrations during rotation. In cases of dynamic imbalance, the forces in one plane balance those in another. Thus, rotating the rotor 90 degrees does not cause the "heavy point" to turn downward, unlike static imbalance. Dynamic methods with a two-plane balancing vibration analyzer are required to correct this.

Active imbalance:
- Happens only while the rotor spins.
- It arises because two unbalanced masses exist in separate planes along the rotor's length. As the rotor rotates, these masses produce centrifugal forces that do not offset each other because of their distinct positions.

To eliminate the dynamic unbalance, two compensating weights must be installed to create a torque equal and opposite in direction to the torque generated by the unbalanced masses. These compensating weights do not have to be equal in weight or opposite to the original masses, as long as they create the necessary torque to balance the rotor.

Dynamic equilibrium: Suitable for long double axle rotors. Eliminates uneven weight distribution in two planes, which prevents vibration during rotation.

How to Balance Shafts Dynamically
https://vibromera.eu/product/balanset-1/

For the dynamic balancing of shafts, the Balanset-1A balancing and vibration analyzer is used.

The Balanset-1A, featuring 2 channels, is designed for dynamic balancing in two planes. This renders it suitable for a broad spectrum of uses, such as crushers, fans, mulchers, augers on combines, shafts, centrifuges, turbines, and many more. Its versatility in handling different rotor types makes it an essential instrument for numerous industries.

https://vibromera.eu/wp-content/uploads/2021/11/?????????-scaled-1024x683.jpg

First Photo: Initial Vibration Reading
https://vibromera.eu/wp-content/uploads/2024/03/5969837695301697405_121.jpg

The first image shows the initial phase of the two-plane dynamic rotor balancing process. The rotor is mounted on the balancing machine. Vibration sensors are attached to the rotor and connected to a computer through a measuring unit. The operator starts the rotor, and the system measures the initial vibrations displayed on the computer screen. This data is used as a baseline for further calculations.

Image 2: Adding Calibration Weight and Measuring Vibration
https://vibromera.eu/wp-content/uploads/2024/03/5969837695301697404_121.jpg

The second image illustrates the stage of installing a calibration weight on one side of the rotor in the first plane. A weight of known mass is fixed at an arbitrary point on the rotor, on the side of sensor X1. The rotor is started again, and the system measures the vibration changes with the installed weight. This data is recorded by the vibration analyzer to determine the effect of the weight on the vibrations.

Third Photo: Moving Calibration Weight and Re-Measuring Vibration
https://vibromera.eu/wp-content/uploads/2024/03/5969837695301697403_121.jpg

The third photograph shows the stage of moving the calibration weight to the other side of the rotor. The weight is taken from the initial point and installed at another point on the opposite side of the rotor. The rotor is started again, and the vibration changes with the weight in the new position are measured. This data is also recorded by the portable balancing instrument for further analysis.

Fourth Image: Final Weights Installation and Balance Verification
https://vibromera.eu/wp-content/uploads/2024/03/5969837695301697402_121-1024x549.jpg

The fourth photo shows the final stage of balancing. Using the measurement data from both sides, the vibration analyzer determines the angle and mass needed to be added for complete rotor balancing. The weights are installed at the points indicated by the instrument on the rotor. After installation, the rotor is started again to check the results. The system shows that the vibration levels have significantly decreased, confirming a successful balance.

Description of the Angle Measurement Process for Installing Corrective Weights
https://vibromera.eu/wp-content/uploads/2024/02/Bs1ManualEngV156-May2023-10421367.png

The picture illustrates the method for measuring the angle for installing corrective weights during rotor balancing.

Rotational Direction
https://vibromera.eu/wp-content/uploads/2024/02/Bs1ManualEngV156-May2023-10431396.png

The image illustrates the rotor's direction of rotation with an arrow. The angle is measured in the rotation direction.

Position of Trial Weight
The trial weight is positioned at an arbitrary point on the rotor. This point is termed the "Trial weight position".

Angle Measurement Process
The image shows the angle f1 (or f2), measured from the trial weight position in the direction of rotation. This angle indicates the corrective weight installation point for balancing.

Position of Corrective Weight (if added)
The corrective weight is located at the point marked with a red dot on the diagram. This point is designated as the "Correction weight position (if added)". The angle f1 (or f2) determines the exact location of this weight.

Placement of Corrective Weight (if removed)
If weight removal is needed for balancing, the corrective weight is removed from the point located 180° opposite the trial weight position. This point is marked with a red dot with diagonal lines on the diagram and is designated as the "Correction weight position (if deleted; 180° opposite)".

Calculation of the Trial Weight Mass

Calculate the trial weight mass using the formula:

MA = Mp / (RA * (N/100)^2)

where:
- MA - mass of the trial weight, in grams (g)
- Mp - mass of the balanced rotor, in grams (g)
- RA - installation radius of the trial weight, in centimeters (cm)
- N - speed of rotor, in revolutions per minute (rpm)

Correction Planes and Vibration Sensors
https://vibromera.eu/wp-content/uploads/2024/02/Bs1ManualEngV156-May2023-10485475.png
https://vibromera.eu/wp-content/uploads/2024/05/??????-??????-??-2024-05-14-01-28-32-1024x573.png

The photo below shows the mulcher rotor, indicating the correction planes and vibration measurement points:

Correction Planes One and Two:
Correction Plane (blue 1): One: Points to the first plane of rotor balancing, where sensor X1 is installed near the right edge of the photo.

Plane 2 (blue 2): Indicates the second plane of rotor balancing, where sensor X2 is installed (closer to the left edge of the photo).

Installations 1 and 2:
Installation Point 1 (red 1): The site where the mass correction for the first plane will occur.

Installation Point 2 (red 2): The site where the mass correction for the second plane will occur.

This photo shows the process of balancing a mulcher rotor, indicating the zones for installing corrective weights in two planes.

Fan Dynamic Balancing in Two Planes

Determining Planes and Installing Sensors

Getting Ready for Sensor Installation
Clean the surfaces for sensor installation from dirt and oil. Sensors should fit snugly to the surface.

How to Install Vibration Sensors
https://vibromera.eu/wp-content/uploads/2024/05/2plschcons-1.png
https://vibromera.eu/wp-content/uploads/2024/05/??????-??????-??-2024-05-14-01-29-01-1024x659.png
- Vibration sensors are installed on the bearing housing or directly on it.
- Sensors are typically installed in two perpendicular radial directions – usually horizontal and vertical.
- Vibration measurements are taken at the machine mounting points to the foundation or frame as well.
- Sensor 1 (red): Attach the sensor closer to the front of the fan, as shown in the image.
- Sensor 2 (green): Mount the sensor closer to the rear of the fan.

How to Connect Sensors
Connect the sensors to the Balanset-1A vibration analyzer.

Steps to Determine Correction Planes
- Plane 1 (red zone): Correction plane located closer to the right side of the fan.
- Plane 2 (green zone): This correction plane is closer to the left side of the fan.

How to Balance

Initial Vibration Reading
Start the fan and measure the initial vibration data.

Placing the Trial Weight
Install a trial weight of known mass on the first plane (Plane 1) at an arbitrary point. Start the fan and take vibration measurements.

Move the trial weight to the second plane (Plane 2) at an arbitrary point. Start the fan again and take vibration measurements.

Analyzing Data
https://vibromera.eu/wp-content/uploads/2024/05/IMG_20190305_162103-1024x589.jpg
Analyze the obtained data to determine the correction weights and the points where they should be installed to balance the fan.

Process of Measuring Angles

Angle Determination for Correction Weights Installation
https://vibromera.eu/wp-content/uploads/2024/02/Bs1ManualEngV156-May2023-10431396.png
https://vibromera.eu/wp-content/uploads/2024/02/Bs1ManualEngV156-May2023-10431665.png
https://vibromera.eu/wp-content/uploads/2024/02/Bs1ManualEngV156-May2023-10421367.png
The image demonstrates the method for determining the angle for installing correction weights:
- Trial weight position (blue dot): Position of the trial weight. This is the reference point, zero degrees.
- Correction weight position (red dot): Position of the correction weight.
- Angle f1 (f2): Angle measured from the trial weight position in the direction of rotation.

Installation of Correction Weights
https://vibromera.eu/wp-content/uploads/2023/05/5384253216985827502_120.jpg
Based on the angles and masses determined by the analyzer, install the correction weights on the first and second planes.

Measure the vibrations after installing the weights and ensure that they have decreased to an acceptable level.

Original Article : https://vibromera.eu/example/dynamic-shaft-balancing-instruction/

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