某四缸柴油机龙门式气缸体动力响应分析

建立了某四缸龙门式柴油机气缸体的有限元分析模型，从某四缸龙门式柴油机气缸体的结构动态特性和振动响应进行分析，采用模态试验对有限元模型进行修正，通过有限元、多体动力学手段研究柴油机在额定工况下，以气缸燃气压力、活塞侧压力和主轴承作用力为主要因素，确定了柴油机所受的激励力，利用模态叠加法对柴油机进行了动态响应分析计算，得出了额定载荷下的整机振动烈度，并与整机振动烈度的实测值进行比较，验证了模型的正确性。

Dynamic Response Analysis of 4 -Cylinder Diesel Engine Cylinder Block

The FEM （Finite Element Model） of the 4 cylinder diesel engine cylinder block is established. A model test is used to correct the FEM. After considering the combustion gas pressure in the cylinder, the piston lateral pressure and the main bearing force, the exciting force of the diesel engine are calculated under rated conditions. The dynamic response analysis of the diesel engine is carried out by the modal superposition method, and obtains the vibration intensity of the diesel engine cylinder block under the rated load. The comparison between the theoretical value and the measured value of the vibration intensity for the diesel engine body is executed, which validates the effectiveness of the modeling in this paper.