复合材料模量对汽车传动轴固有频率的影响

利用Ansys Workbench有限元软件和脉冲激振技术,分别从有限元理论计算与实验相结合的角度研究了不同纤维增强复合材料对汽车传动轴固有频率的影响规律。采用玻璃纤维、玄武岩纤维、T700碳纤维及T800碳纤维等四种不同纤维制备了复合材料传动轴轴管,并根据GB/T 1548—2008,表征了复合材料的力学性能。利用有限元仿真与脉冲激振模态测试两种方法表征了不同纤维缠绕的复合材料汽车传动轴的固有频率。结果表明:脉冲激振模态测试传动轴的固有频率方法结果比较直观,可以准确地得到传动轴的固有频率;有限元仿真分析与脉冲激振法实测结果有一定偏差,但可以通过仿真模型的调整,使仿真结果更加准确;提高复合材料的拉伸模量是提高复合材料传动轴固有频率的有效途径之一。

EFFECT OF FIBER MODULUS ON NATURAL FREQUENCY OF COMPOSITE AUTOMOBILE DRIVE SHAFT

In this paper,Ansys Workbench finite element software and pulse excitation technology were used to study the influence of different fibers on the natural frequency of the composite automotive drive shaft from the perspective of the combination of finite element method and experiments.Fiberglass,basalt fiber,T700 carbon fiber and T800 carbon fiber were used to wound composite shaft.The mechanical properties of composites were characterized according to GB/T 1548-2008.The natural frequency of the drive shaft of different fiber composites were characterized by finite element simulation and pulsed vibration mode test.The results show that the method of testing the natural frequency of the drive shaft by pulse excitation mode is more intuitive and the natural frequency of the drive shaft can be obtained accurately.The results of finite element simulation and pulse excitation show a certain deviation.But,the simulation results can be adjusted more accurately to make the simulation results more accurate.It is one of the effective ways to improve the natural frequency of composite shaft by increasing the modulus of composites.