Evaluation of the balance of rigid rotor
Published:
2019-06-06 14:35
In order to evaluate the superiority and inferiority of the rotor balance, it is necessary to investigate the balance accuracy level of the rotor. For the same rotor, the smaller the amount of unbalance remaining, the better the balance of the rotor. However, for the same amount of unbalance, when the rotor of different quality rotates at the same speed, the adverse effects are different. Specifically, the greater the mass of the rotor, the smaller the adverse effect, in other words. The greater the mass of the rotor, the greater the allowable imbalance, and the allowable imbalance is related to the quality of the rotor. However, when evaluating the superiority and inferiority of the rotor balance, it is often used to have an amount that is independent of the rotor mass M. This means that the allowable imbalance, also called the imbalance, is defined as the permissible unevenness of the rotor unit mass. The measure is expressed as follows:
At the same time, the adverse effects caused by the unbalanced quantity are also closely related to the rotational speed of the rotor. The higher the rotational speed of the rotor, the greater the adverse effect caused. In order to reduce such adverse effects, the allowable imbalance should be smaller. . We all know that the rotor unbalanced centrifugal force is proportional to the square of the rotational speed ω, but for a geometrically similar rotor, when rotating at the same peripheral speed, the same stress is caused by the rotor and its support under the action of unbalanced centrifugal force. The same eω value should be available. At the same time, considering the rotating machine that operates at a normal speed, the same feeling for vibration is the same as long as the vibration speed is the same. Therefore, rotors for the same eω value can be classified as the same level of accuracy. In addition, the balance accuracy and the division accuracy level of the rotor can be evaluated by the product eω, and the definition relationship of the accuracy level is:
Where e - the imbalance of the rotor (g ? mm / kg);
Ω——rotation angular velocity of the rotor (1 / s);
G——The balance accuracy level of the rotor (mm / s).
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