基于联合仿真的二冲程发动机动态特性研究  

Study on Dynamic Characteristics of Two-Stroke Engine Based on Co-Simulation

作　　者：虞启辉[1] 张立从 耿延歧 YU Qihui;ZHANG Licong;GENG Yanqi(School of Mechanical Engineering Inner Mongolia University of Science&Technology,Inner Mongolia Baotou 014010,China)

机构地区：[1]内蒙古科技大学机械工程学院,内蒙古包头014010

出　　处：《机械设计与制造》2025年第1期15-20,共6页Machinery Design & Manufacture

基　　金：国家自然科学基金地区基金项目(52065054)。

摘　　要：二冲程发动机作为油动无人机的核心动力部分,其振动情况直接影响着油动无人机的可靠性,因此有必要对二冲程发动机动态特性进行研究。连杆是发动机的主要传力构件,其动态特性对发动机的运转状态起决定性作用,基于此以某型二冲程航空发动机为原型,搭建了联合仿真平台对其进行动力学仿真,得到了连杆的受力情况,随后以连杆所受的最大力为载荷条件对连杆进行了预应力模态分析和谐响应分析。从预应力模态分析中得知连杆变形主要以弯曲和扭转为主,杆身位置变形最大,为连杆的薄弱环节,考虑对其进行渗碳和喷丸处理;对连杆的谐响应分析得到了杆身在X、Y和Z方向的振幅-频率曲线,确定连杆在第1阶和第2阶模态频率处容易发生共振,建议避免连杆在该激励频率附近工作,为连杆的优化和发动机的减振提供了理论依据。Two-stroke engine is the core power part of fuel-powered unmanned aerial vehicle(UAV),its vibration directly affects the reliability of fuel-powered UAV,so it is necessary to study the dynamic characteristics of two-stroke engine.Connecting rod is the main force transmission component of the engine,and its dynamic characteristics play a decisive role in the running state of the engine.Based on this,a co-simulation platform is built to simulate the dynamics of a two-stroke aero-engine,and obtains the force of the connecting rod.Then,the pre-stress modal analysis and harmonious response analysis of the connecting rod are carried out with the maximum force of the connecting rod as the load condition.According to the pre-stress modal analysis,the deformation of the connecting rod is mainly bending and torsion,and rod body is the most deformed position,which is the weak link of the connecting rod.Carburizing and shot peening are considered.By the harmonic response analysis of the connecting rod,the amplitude-frequency curves of the rod body in the X,Y and Z directions are obtained,and it is determined that the connect⁃ing rod is prone to resonance at the first and second modal frequencies.It is suggested that the connecting rod should avoid work⁃ing near the excitation frequency,which provides a theoretical basis for the optimization of connecting rod and vibration reduc⁃tion of engine.

关 键 词：二冲程发动机 连杆 振动 预应力模态分析 谐响应分析 

分 类 号：TH16[机械工程—机械制造及自动化] TH457