Research Of Dynamics Characteristics And Visualization On Rotor System Of Turbocharger

As one of the important subsystems of engine, turbocharger is the effective means to improvethe engine power, reduce emissions, save energy and reduce the noise. Its efficiency, reliability,stability will have an important influence to the engine performance. Rotor system is the core part ofthe turbocharger, so the performance and service life of the rotor system will determine the runningperformance of the turbocharger.Based on the enterprise project "based on lean oil lubrication model of the turbocharger faultand its visualization research" as the background, a model to be GJ90C turbocharger as the researchobject, the dynamics modeling and analysis method of rotor system is studied. In order to prove thevalidity of the method of modeling and the accuracy of the analysis results, the theoreticalcalculation and test check is combined. According to the theory and test methods, a newvisualization software which is special for the turbocharger is developed. The main content of thepaper are as follows:The first part establishes the finite element model of the rotor system. Through the rotor motiondifferential equation, the modal frequencies and modal shapes of the free motor are calculated andanalyzed; then the natural frequency of the rotor system with speed and support stiffness are studied;the vibration mode and Campbell diagram are analyzed in detail.The second part establishes the test bench of turbocharger and carries on the rotor dynamiccharacteristic test. The axis trajectory in different speed and the vibration in different direction aretested. The rationality of the theoretical model was verified through the analysis of the axistrajectory and waterfall diagramThe third part is the visual part. According to the finite element model of turbocharger,visualization software of axis trajectory and vibration mode is studied and developed with OpenGLtechnology and the tools of Matlab founding on the system platform of Windows. parts. Theoreticaland experimental results relative ratio, which makes the turbocharger research become convenient.