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首页> 外文期刊>American Journal of Mechanical and Industrial Engineering >Opposed-Piston Crankshaft System Dynamics Simulation and Durability Analysis in a Neotype Two-Stroke Diesel Engine
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Opposed-Piston Crankshaft System Dynamics Simulation and Durability Analysis in a Neotype Two-Stroke Diesel Engine

机译：新型两冲程柴油机对置活塞曲轴系统动力学仿真和耐久性分析

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摘要

For the opposed-piston and opposed-cylinder (OPOC) diesel engine with higher power density, recently it has drawn even more attentions than ever in several developed countries, such USA and Germany, et al, which is regarded as a technical innovation to further reduce emission, and decrease fuel consumption, attributed to outstanding thermal efficiency and engine package downsizing. To explore the interrelation of this special crank system in concept design stage, the multi-body dynamics and durability of the piston-opposed crankshaft system was investigated. Firstly the optimized function model of the unique crankshaft system in an OP2S (Opposed-piston two stroke) engine was established. Then it was to figure out the influence of all structural design parameters on OPE crankshaft averaged output torque, respectively. The calculated results show that the initial crank angle difference between inner crank web and outer crank web was the most critical contributor to elevate the averaged torque output than other structural parameters. The parametric 3D model of crankshaft system was refreshed automatically based on the optimized variables. Finally an OPE crankshaft prototype was manufactured and bend fatigue experiment was carried out in a relevant laboratory to obtain the material S-N Curve. The HCF (High Cycle Fatigue) result was indicated that the minimum safety factor on crank journal fillets can reach relevant estimation criterion without crankshaft failure occurring for an engine speed sweep.
机译：对于功率密度更高的对置活塞和对置气缸（OPOC）柴油发动机，近来它在美国和德国等几个发达国家引起了越来越多的关注，这被认为是进一步发展的一项技术创新。归因于出色的热效率和发动机套件的小型化，从而减少了排放并降低了油耗。为了在概念设计阶段探索这种特殊曲轴系统的相互关系，研究了活塞对置曲轴系统的多体动力学和耐用性。首先，建立了OP2S（对置活塞两冲程）发动机中独特曲轴系统的优化功能模型。然后分别找出所有结构设计参数对OPE曲轴平均输出扭矩的影响。计算结果表明，与其他结构参数相比，内曲柄腹板和外曲柄腹板之间的初始曲柄角差是提高平均扭矩输出的最关键因素。根据优化变量自动刷新曲轴系统的参数3D模型。最后，制造了OPE曲轴原型，并在相关实验室中进行了弯曲疲劳实验，以获得材料S-N曲线。 HCF（高周疲劳）结果表明，曲柄轴颈圆角的最小安全系数可以达到相关的估计标准，而不会因发动机转速扫描而发生曲轴故障。

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