压壳约束对涡轮增压器模态及共振倾向的影响研究

Research on the Influence of Compressor Housing Constraint on theModal and Resonance Tendency of Turbochargers

在当前发动机高度集成化的背景下,如何有效避免排气系统与发动机点火频率之间的共振,以提升排气系统的模态,成为了一个极具挑战性的课题。为了解决某款涡轮增压发动机在集成了废气再循环(EGR)系统和颗粒捕集器(GPF)时所出现的排气系统模态降低的问题,本文重点研究了增压器压壳约束点布置方式对排气系统模态的影响。通过计算机辅助工程(CAE)仿真,对比了不同压壳支架布置对系统模态的影响,同时,通过试验验证了不同压壳支架布置方式对涡轮增压器轴心轨迹、振动特性以及发动机耐久性的影响。研究得出结论:在压壳设置约束点并不能完全解决排气系统模态降低的问题,且排气系统模态的降低并不会与发动机产生共振效应。

In the context of highly integrated modern engines,effectively avoiding resonance between the exhaust system and engine firing frequency to enhance exhaust system modal characteristics has become an immensely challenging issue.To address the problem of reduced exhaust system modal characteristics in a turbocharged engine integrated with an EGR system and a GPF system,this paper focuses on investigating the impact of the layout of casing restraint points on exhaust system modal characteristics.Through CAE simulations,a comparative analysis of the effects of different casing support arrangements on system modal characteristics is conducted.Additionally,experimental verification is performed to assess the influence of various casing support layouts on the axial trajectory,vibration characteristics,and engine durability of the turbocharger.After an in-depth study,it is concluded that merely adjusting casing restraint points cannot fully resolve the reduction of exhaust system modal characteristics,and the lowered exhaust system modal characteristics do not lead to resonance effects with the engine.