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建立某六缸柴油机基于多体动力学与有限元联合仿真的虚拟平台,并结合试验测试与仿真计算数据结果验证该虚拟仿真平台的合理性。同时,基于虚拟仿真平台模拟计算柴油机在燃烧激励力、侧向力、主轴承力作用下各测点的振动响应,并通过振动速度来分析不同测点处各激励力作用下振动响应信号的差别,同时着重分析了一个工作循环内侧向力三个明显波峰体现出的活塞拍击冲击响应及产生机理,以及活塞侧向力的时频特征与能量大小。研究结果表明,虚拟仿真方法与时频技术的采用有效表征了各激励载荷与结构振动信号特征的影响关系,同时也有效避免了干扰激励源或干扰信号的影响,对于制定减振降噪措施具有一定指导价值。
The virtual platform of a six-cylinder diesel engine based on multi-body dynamics and finite element co-simulation is established. The rationality of this virtual simulation platform is verified by combining the results of test and simulation calculation. At the same time, based on the virtual simulation platform, the vibration response of each measuring point of diesel engine under combustion excitation force, lateral force and main bearing force is simulated and the difference of vibration response signals under different excitation points is analyzed by vibration velocity At the same time, the impact response and mechanism of the piston slamming shock, as well as the time-frequency characteristics and energy of the piston lateral force, are analyzed emphatically. The results show that the adoption of virtual simulation method and time-frequency technique effectively characterize the relationship between each excitation load and the characteristics of structural vibration signals, and effectively avoid the influence of disturbing excitation sources or interference signals. Therefore, Certain guidance value.