Balance rotating machine parts, such as shafts, rotors, and pulleys. Using input data about the rotation speed and reaction speeds, determine where to attach or remove mass to bring the part into balance.
Background concepts:
In a rotating machine part, imbalance occurs when the mass is not distributed around the rotation axis perfectly. This causes unequal centrifugal forces on the part as it rotates. These net forces create extra loads on the bearings, cause vibration, and lead to premature fatigue failure.
Requirements:
- No requirements outside the Python Standard Library
Install by cloning this repo and using pip:
cd rotor-balancing
pip install -e rotor_balancingNote the -e flag, which installs in editable mode and allows you to modify the source at will after installing.
Imbalances are dealt with in terms of mass x radius (kg-m).
balance_one_plane:
Determine the added balance mass needed to balance a single plane, based on the known imbalances in that plane. Known imbalances are given in vector form, in units of mass*radius.
rotor_balancing.balancing.Vector is a class which implements the
vector addition, multiplication, and comparison operations required for
single-plane balancing. Vector is three-dimensional, though for a single
plane, the third component is not used.
To balance a given rotor, the existing imbalances have to be measured and
located. This can be done by using the Rotor class. Three test
runs are required, measuring the deflection of the rotor bearings while rotating
with two test masses. Sensors should be set up to measure the bearing deflection
correlated with the angular position of the rotor. Choose two balance planes,
locations where the added masses will be attached. Place a known test mass (kg-m)
on one plane, drive the rotor, and measure the deflection (magnitude and phase
angle). Remove the test mass and repeat the process with a test mass (kg-m) in
the other balance plane. Given the deflection magnitudes and phase angles at
each bearing for each test mass (and the baseline), the method can determine the
required balance masses to add to each balance plane to bring the rotor into
dynamic balance.
See the examples folder for a script showing usage of the Rotor class.
Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.
This project is licensed under the (insert license here) - see the LICENSE.md file for details
- Theory of Machines and Mechanisms, 4th ed. Uicker, Pennock. 2010.