轻量化对发动机整机振动烈度的影响

丁保安^1,2，王景新^1,2，苏艳^1,2

1.内燃机可靠性国家重点实验室，山东 潍坊  261061；2.潍柴动力股份有限公司，山东 潍坊  261061

摘要：为研究发动机轻量化对整机振动的影响，在不改变整机零部件结构的情况下，将飞轮壳及齿轮室材料由铸铁改为铸铝，基于柔性体多体动力学方程，采用Hypermesh及AVL Excite软件建立整机多体动力学仿真模型，对原发动机振动烈度和振动加速度进行多体动力学仿真和发动机台架试验验证，并对优化前、后的发动机振动烈度和振动加速度进行仿真对比。结果表明：飞轮壳、齿轮室材料由铸铁改为铸铝后，整机总质量减轻8.5%；额定转速下整机振动烈度由42.7 mm/s增大为45.7 mm/s，振动加速度由53.8 m/s²增大为57.6 m/s²，振动等级均为6级A/B，对发动机振动影响较小。

关键词：飞轮壳；齿轮室；多体动力学；轻量化；振动烈度

Influence of lightweight on the vibration intensity of the entire engine

DING Baoan^1,2, WANG Jingxin^1,2, SU Yan^1,2

1.State Key Laboratory of Engine Reliability,Weifang 261061, China;

2. Weichai Power Co., Ltd., Weifang 261061, China

Abstract：In order to study the impact of engine lightweight on the vibration of the entire machine, the material of the flywheel housing and gear chamber is changed from cast iron to cast aluminum without changing the structure of the entire machine components. Based on the flexible body multi body dynamic equation, a multi body dynamic simulation model of the entire machine is established using Hypermesh and AVL Excite software. Multi body dynamic simulation and experimental verification are conducted on the vibration of the engine after optimizing the material, and compared with the original engine. The results show that after changing the material of the flywheel housing and gear chamber from cast iron to cast aluminum, the total mass of the entire machine decreases by 8.5%. At rated speed, the vibration intensity of the entire machine has increased from 42.7 mm/s to 45.7 mm/s, and the vibration acceleration has increased from 53.8 m/s² to 57.6 m/s². The vibration levels are level 6 A/B, and the impact on engine vibration is relatively small.

Keywords:flywheel housing; gear chamber; multi body dynamics;lightweight; vibration intensity