Simulation study on unbalance vibration characteristics of dual-rotor system

Abstract

The unbalance vibration characteristics of dual-rotor system were fully analyzed based on design of experiment in this paper. Firstly, a simplified dual-rotor system was presented with the consideration of radial stiffness and damping of bearing supports and modelled in ADAMS so that multi-body dynamic simulations could be carried out. Subsequently, the unbalance parameters of a single unbalanced disk were sampled by experimental design method, and then vibration responses in multiple unbalance conditions were obtained via the simulations in ADAMS which results showed the response ranges at measuring points, vibration transmission routes and the definite proportional relations of vibration responses among different speeds, as well as, there was the correlation between the unbalance parameters and the response amplitude. Finally, studies about the double unbalanced discs severally in low-and high-pressure rotors were conducted, and the similar laws were summed up; more importantly, there were consistencies with the case of the single unbalanced disk in terms of the vibration amplitude ranges and the constant proportionality relationship of amplitudes among different rotating speeds, as well as the correlation between unbalance parameters and response amplitude. The presented results offer significant and incisive understanding for the dynamic performances of an unbalanced dual-rotor system.

A Decoupling Algorithm-Based Technology for Predicting and Regulating the Unbalance of Aircraft Rotor Assembly Considering Manufacturing Errors

“…During rotor assembly, both factors should be reasonably considered. (3) The impact of manufacturing errors on unbalance levels and concentricity was studied. With increasing tilt error, unbalance initially decreased and then increased.…”

“…Unbalance is the primary excitation source for rotor system vibration responses. Therefore, achieving prediction and control of unbalances is especially crucial for enhancing the assembly quality and service performance of aircraft engines [2,3].…”

An integrated study for solving high vibration problem of a deep well turbine pump

“…After applying the new modifications it was illustrated that the vibration amplitude at the pump running speed was reduced as shown in fig. (5). Vibration amplitude reaches 16.20 mm/s and 10.51 mm/s in the vertical and horizontal directions respectively.…”

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