扭力梁式后悬架模态与疲劳试验研究-噪声与振动控制.PDF

第37 卷 第6 期 噪 声 与 振 动 控 制 Vol 37 No.6 2017 年12月 NOISE AND VIBRATION CONTROL Dec. 2017 文章编号：1006-1355(2017)06-0115-05 扭力梁式后悬架模态与疲劳实验研究 黄志超，王九州，程 梁 （华东交通大学 载运工具与装备教育部重点实验室，南昌 330013 ） 摘 要：扭力梁式后悬架是汽车行驶系统中重要的承重构件，在不同的行驶工况下，会受到不同幅值和不同频率的 激励。在激励频率和扭力梁式后悬架固有频率接近或相同时，会产生共振，进而发生疲劳断裂。通过对扭力梁式后悬 架进行模态实验，获得该结构的固有频率和模态振型。对同一型号的扭力梁式后悬架进行弯曲、扭转疲劳实验，得到 其疲劳破坏的具体形式。对产生破坏的扭力梁式后悬架进行模态实验，对未损坏和损坏的扭力梁式后悬架各自的固 有频率和模态振型进行对比分析，发现产生疲劳破损的扭力梁式后悬架在某一阶频率下的模态振型有较大变化，结构 的固有频率值和固有频率分布的变化并不很大。 关键词：振动与波；扭力梁式后悬架；模态实验；疲劳实验；固有频率；模态振型 中图分类号：U463.3 文献标识码：A DOI 编码：10.3969/j.issn. 1006-1355.2017.06.024 Experimental Study on Modals and Fatigue of Torsional Beam Rear Suspensions HUANG Zhi-chao , WANG Jiu-zhou , CHENG Liang ( Key Laboratory for Conveyance and Equipment, Ministry of Education China, East China Jiaotong University, Nanchang 330013, China ) Abstract : Torsional beam rear suspension is an important load-bearing component in automobile ’s driving system. It is subjected to the excitations with different amplitudes and different frequencies under different driving conditions. When the excitation frequency and the natural frequency of the torsional beam rear suspension are close each other, the torsional beam rear suspension resonates, and then the fatigue fracture may occur. In this paper, through the modal test, the natural frequencies and the modal shapes of the torsional-beam structure are obtained. Then, bending and torsion fatigue tests of the torsional beams of the same type are carried ou