Abstract
In order to control the vibration of the involute spline coupling in aeroengine well and reduce the fretting wear, a bending–torsion coupling nonlinear vibration model of the involute spline coupling with the misalignment was proposed, and a dynamic meshing stiffness function with multiteeth engagement was established. Then, the influence of different misalignment, wear, and rotation speeds with different misalignment on the nonlinear vibration characteristics of the involute aviation spline coupling was explored. The result shows that with an increase of the parallel misalignment, the system experienced the state of a single period, a quasiperiod, multiperiod, and chaos but finally only alternated between the quasiperiod and the chaos state. The uneven wear of each tooth of the spline displayed a significant influence on the vibration of the spline coupling, and the influence of the uniform wear was smaller under given conditions here. Furthermore, with an increase of the speed, the larger the misalignment was, the more times the system entered or left the chaos state were. The model proposed here is found to be closer to the actual working conditions, and the analysis results can provide more accurate external load conditions for the prediction of the fretting damage of the spline coupling in aeroengine.
Highlights
There should be no relative displacement between the involute spline couplings of aeroengine
As the involute spline couplings are subjected to a strong external excitation of cycle loads and the internal excitation introduced by the time-varying meshing stiffness and the error produced in the process of manufacturing or assembly while taking off, cruising, and landing, they exhibit a heavy nonlinear vibration [1,2,3,4]
For the internal and external spline shafts, they are misaligned during installation or misaligned due to heating, loading, and foundation deformation, or there is a misalignment between the involute spline couplings before assembly
Summary
There should be no relative displacement between the involute spline couplings of aeroengine. In 2003, Ding et al proposed a numerical method based on the modified Archard’s equation to simulate the fretting wear of a pin disk under the partial sliding and complete sliding, which calculated the surface contact pressure and the sliding distance and calculated the subsurface contact pressure [28] According to these analyses, the above studies did not investigate the fretting wear on the vibration characteristics of bending–torsion under the internal and external excitation of the system, and Zhao and others only considered the relationship between the fretting wear and the vibration displacement [13, 29, 30]. The vibration characteristics of the involute spline coupling in the aeroengine system on different parallel misalignment, fretting wear, and speed rotation were studied. It is of great significance for controlling the vibration and reducing the fretting wear failure to study the bending–torsion coupling nonlinear vibration characteristics of the involute splines considering the parallel misalignment
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