负荷突降工况柴油机曲轴应力多柔体动力学分析

通过仿真试验对负荷突降和转速上升2种工况下曲柄销中心和主轴颈中心处的应力情况进行定量分析,并对应力图谱进行分析。利用Pro E软件对柴油机运动部件进行三维建模,并对其进行组装配置。基于有限元软件ANSYS建立曲轴的三维模型,对曲轴的模态进行分析,进而形成曲轴的多体动力学模型。利用ADAMS平台建立柴油机运动模型,通过施加约束、运动和载荷,最终形成柴油机的虚拟样机试验平台,得到相应工况下的应力图谱,并加以分析。

The Multi- flexible-body Dynamic Simulation of Crankshaft for Load Dump Condition

The load dump of diesel engine and the consequent sudden speed increase have many adverse impacts on the engine itself. This paper carries out multi-body dynamics simulation of the main moving parts of the diesel engine to quantitatively study the specific performance of this adverse impact on the crankshaft force. The diesel engine 3D assembly and modeling of the moving parts of are carried out using ProE. Then the finite element modal analysis of the 3D crankshaft is carried out in ANSYS, and a file of the dynamic characteristic for the crankshaft is formed, which is input into the ADAMS to establish the flexible body model of the crankshaft, so that the impact of flexible deformation of the crankshaft on stress can be more accurately analyzed. Finally, the moving parts of the diesel engine are modeled in the simulation platform ADAMS, and the simulation experiment for the dynamic analysis of the main moving parts of the diesel engine is completed, so that the stress spectrum of the crankshaft feature points under load dump condition is obtained, which can directly reflect the impact of load dump condition on the stress condition of the crankshaft.