Shaft unbalance response analysis
Since the mass eccentricity of the manufacturing and mounting shaft always exists, it is also very important to calculate the unbalanced response of the shafting in the design stage. By estimating the unbalanced response, the rotor structural parameters are adjusted to ensure that the vibration of the unit reaches the specified standard during operation.
4 Conclusion
In this paper, DyRoBeS rotor dynamics analysis software is used to calculate the critical speed and unbalance response of the long-distance pipeline compressor 20MW high-speed variable frequency explosion-proof motor project shaft system, and the following conclusions are obtained:
(1) In order to ensure the accuracy of the calculation results, the motor shafting system needs to be reasonably simplified, and the influence of the shaft body crescent and the 3# bearing elevation amount should be considered in the simplification process.
(2) Using DyRoBeS rotor dynamics analysis software to calculate the critical speed of the shafting system, the calculated results are: first-order critical speed 1756rpm, second-order critical speed 2232rpm and third-order critical speed 5952rpm, effectively avoiding the motor The running speed is 3120~5040rpm, so the structural design of the shafting system is reasonable.
(3) According to the balance level of the shafting system, the maximum response value of the bearing position at the critical speed is 0.048mm, which is located at the 3# bearing position. This result satisfies the requirements of the rotating machinery vibration.
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