Determination of balancing masses using linear systems of equations
If the drying cylinders are reground during an overhaul, they must also be rebalanced afterwards. Especially in older dryer sections where the drying cylinders are synchronized via gears, balancing a single cylinder on-site is very complex, as the transfer gears have to be removed and each cylinder has to be driven independently.
To avoid this high effort, so-called coupled rigid balancing can be used for synchronously running rotors. Here, vibration sensors are applied to all bearing points in the dryer section and the first-order vibrations are recorded at operating speed.
Depending on the number of bearings, taring runs must be performed with different mass distributions across the balancing planes. Similar to balancing with two planes, this results in a linear system of equations with a number of unknowns corresponding to the number of balancing planes. Solving this system of equations allows the size and position of the balancing masses to be calculated.
