Abstract
Many researchers have designed the dynamic models to study the vehicle-engine vibration. However, the existing mechanical models are relatively simple, and the analysis of engine vibration damage is discussed rarely. In this paper, we proposed the models of coupling dynamics and damage classification of vehicle-engine vibration. The key advantages of these proposed models are (1) the finite elements method is adopted for the rotor and casing system, and the complex structure with multirotor and multicasing is modeled by defining support system and linking methods; (2) the hybrid numerical integral method is used to obtain the inherent frequency of the nonlinear dynamic system; and (3) the algorithms based on backpropagation (BP) neural network and radial basis function (RBF) neural network are chosen to construct the damage classification model of rotors. Experimental results based on the engine rotor tester prove that the proposed models are not only more robust than the existing works but also show that the classification algorithms can support engine damage analysis effectively.
Highlights
The main methods of calculating the critical speed and imbalance steady state response of the rotorsupport system are the conventional transfer matrix, finite element (FEM), and substructure modal synthesis [1]
Hai et al built two-rotor dynamic model with nonlinear squeeze film damper bearing [8]. ey utilized NASTRAN FEM software to obtain the model parameters of the linear undamped system, and the nonlinear numerical simulation analysis was performed by MATLAB software
Wang et al focused on the dynamic responses of whole aeroengine with blade-casing rubbing. ey proposed several methods [11,12,13,14,15] to improve energy efficiency and compact structure. ese results can provide important theoretical and engineering references for the safe operation of dual-rotor system and the exact identification of coupling faults
Summary
The main methods of calculating the critical speed and imbalance steady state response of the rotorsupport system are the conventional transfer matrix, finite element (FEM), and substructure modal synthesis [1]. In [4], the model synthesis method and FEM were combined to study the vibration characteristics of the engine rotor-supportcasing system. A flexible double-rotor FEM model with the nonlinearity of rolling bearing and squeeze film damper was proposed [6], and the transient response simulation of blade loss was implemented. Considering the squeeze film damping effect, the rolling bearing nonlinearity, and the rubbing fault, the rotor was seen as the equal section free Euler beam. In order to solve the complicated structure of the engine, this paper describes a general model of rotorsupport-casing coupling dynamics for engine vibration, which uses the finite element method to model the rotor and casing system firstly. Besides the analysis of model coupling dynamics, this paper studied the rotor damage detection.
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