In this paper, the multidisciplinary coupled dynamics simulation method and reliability modeling method are studied for the problems of low accuracy, stuck and strength degradation of aero engines. Based on the ADAMS software platform, the parametric modelling is proposed for aero-engine guide vane adjustment mechanism of variable geometry turbine, and the parametric model is simulated. The effects of dimensional uncertainty, component deformation, load uncertainty, strength uncertainty and strength degradation on the reliability of the mechanism are considered. Through simulation analysis, the key factors affecting the reliability of the mechanism can be identified and guidance can be provided for the establishment of the reliability model. Finally, the reliability of the mechanism regarding motion accuracy failure, stuck failure and strength failure was calculated by Monte Carlo method.
Aiming at the problem of performance degradation caused by the long-time running of the aero-engine rear variable area bypass injector, the fatigue strength of the components will be degraded under the action of load, and the degradation of the performance of these components will lead to the degradation of the performance of the mechanism, failing in the adjustment accuracy to meet the design requirements. The degradation will also lead to the failure of the mechanism to meet the speed regulation, resulting in the degradation of the engine's variable cycle, which in turn affects the overall performance of the aircraft flight.
KEYWORDS: Reliability, Nozzles, Actuators, Data modeling, Monte Carlo methods, Design and modelling, Statistical analysis, Rain, Analytical research, Statistical modeling
During the operation of an aero-engine vector nozzle mechanism, the properties of the material itself are subject to change as well as degradation. In this paper, the fatigue and time-dependent failure mechanism and damage evolution law and performance degradation law of mechanism components that may occur in service life cycle under various flight missions are studied, which are of great significance to the mechanism performance degradation law and its uncertainty characterization method. Meanwhile, this paper studies the strength reliability analysis model based on the Monte Carlo method with Latin hypercube improvement under a variety of flight missions, considering the strength degradation of mechanism parts and the dimensional dispersion, and provides some support for the reliability assessment and design of Axial-Symmetric Vectoring Exhaust Nozzle (AVEN) mechanism.
Aiming at the problem of low control accuracy of aero-engine kinematics, the multidisciplinary coupled dynamics simulation method and reliability modelling method are studied. In this paper, based on the ADAMS software platform, the parametric modelling is proposed for aero-engine guide vane adjustment mechanism of variable geometry turbine, and the parametric model is simulated. The equation of motion for the mechanism is established based on MATLAB and is theoretically analyzed and verified. The result is consistent with the theoretical analysis result, which verifies the correctness of the mathematical model and the simulation model. The dimensional uncertainty caused by machining errors and the effect of component deformation caused by external loads on the vane motion accuracy are considered in this paper. Through the simulation analysis, the key factors affecting the vane motion accuracy can be identified, providing guidance for the establishment of the reliability model. Finally, the reliability of the vane rotation angle is calculated by Monte Carlo method. The method proposed in this paper can be used to improve the reliability design and optimize the structure of the guide vane adjustment mechanism of variable geometry turbine.
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