摘要
基于国内某型高速动车组车下旋转设备的振动测试试验,建立考虑车体弹性和车下旋转设备不均衡振动的刚柔耦合动力学模型,分析车下旋转设备两级悬挂方式对车体和旋转设备振动行为的影响。通过车体有限元完整模型、子结构模型和模态试验的分析结果,确保动力学模型中的弹性车体可以反映车体实际的振动模态。研究结果表明,两级悬挂方式主要降低车体受到的不均衡振动,对其他频率下的振动影响较小,与单级悬挂相比较,其振动幅值降低了约一半,减振效果明显;两级悬挂系统中的框架质量、悬挂频率和阻尼比对车体和旋转设备的振动影响明显,通过选取合理的悬挂参数使得车体减振效果更明显;与单级悬挂比较,两级悬挂结构复杂,不适用于所有的车下旋转设备,为确保某些重要电器元件满足长期服役运营的需求,对其冷却风机等旋转设备采用两级悬挂方式可以获取良好的减振效果。
Based on the field test on carbody underframe rotational equipment of some high-speed railway vehicle, a flexible-rigid coupled model considering carbody elastic and unbalanced vibration of rotational equipment was established. Applied with two-stage suspension of underframe rotational equipment, the vibration performance of carbody and underframe suspended equipment is analyzed. Comparing the result of carbody complete finite element model, the substructure model and modal test, the elastic carbody in the dynamic model can reflect the reality of carbody vibration modal. The result shows that the two-stage suspension mode mainly reduces the carbody vibration caused by dynamic unbalance, while has little influence on the vibration of other frequencies. Compared with the one-stage suspension, the vibration amplitude is reduced by about half, and the effect of vibration reduction is obvious. In the two-stage suspension system, the frame mass, suspension frequency and damping ratio have obvious influence on the vibration of carbody and the equipment. The effect is more obvious by selecting reasonable suspension parameters. The structure of two-stage suspension is complex and is not suitable for all underframe rotational equipment. To meet the requirement of long-term service operation of some electrical components, the application of two-stage suspension on the rotational equipment can obtain good effect of vibration reduction.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2018年第8期1-7,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(U1334206,51475388)
国家科技支撑计划(2015BAG13B01-03)资助项目
关键词
高速动车组
车下旋转设备
不均衡振动
两级悬挂
车体减振
high-speed railway vehicle
underframe rotational equipment
unbalanced vibration
two-stage suspension
carbody vibration reduction
