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Study on Turbocharger Dynamic Characteristics and Structure Optimization

Author: LiWang
Tutor: GuChuanGang；ZhongZuo
School: Shanghai Jiaotong University
Course:
Keywords: turbocharger center housing finite element method natural frequency
CLC: TK423
Type: Master's thesis
Year: 2011
Downloads: 308
Quote: 2
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Abstract


A turbocharger is a mechanism which has the compressor powered by a turbine driven by the IC engine exhaust gas. As the most widely used boost technology, turbocharger design is expected higher reliability than before. It’s very important to reduce turbocharger failure rate due to resonance under engine vibration condition. Based on the development project of VNT turbocharger, dynamic characteristics study and structure optimization were performed to enhance the low order natural frequency and stiffness of system. The main work of this thesis is summarized as follows:1. Performed modal analysis on baseline turbocharger by utilizing finite element method. Identified turbocharger dynamic characteristics such as modal frequencies and modal shapes, and found out the weak point of structure.2. Studied on design scenarios e.g. cast iron backplate, integrated backplate designed center housing and actuator brackets optimization. Through back-to-back modal analysis results comparison, it shows optimized design has higher modal frequencies than baseline.3. Made prototypes for each design scenario, and conducted resonance reach sine sweep tests on vibration rig to determine the 1st natural frequency and modal shape of turbo system. It shows good correlation by comparing measurements and FEA results. FEA analysis and testing results indicated that integrated backplate design and optimized actuator bracket works well in dynamic characteristics enhancement. It can increase turbocharger 1st natural frequency dramatically, and minimize the risk and possibility of turbocharger mechanism resonance due to engine vibration.This thesis provided solution for a real engineering problem, and thought map for turbocharger or similar equipments development and application as well.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Diesel engine > Structure
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