手动变速器换挡操作机构频响分析

Frequency Response Analysis of Manual Transmission Shifting Operation Mechanism

摘要: 针对国内某车型手动变速器换挡产生的二次冲击影响用户换挡操作品质的问题，对变速箱外操纵机构进行性能研究并优化其结构动力学响应性能，进而减小换挡二次冲击。通过创建手动变速器外操纵机构有限元模型，从模态和频响理论推导计算并结合NASTRAN分析工具进行频响分析和论证。试验结果表明，仿真分析的结果准确可靠。最后，从系统阻尼系数和拉索支架刚度分别探讨影响二次冲击的因素，结果表明增加换挡系统的阻尼，增加换挡拉索支架的刚度以及减小换挡拉索接头刚度有利于减少换挡二次冲击。

Abstract: Aiming at the problem that the secondary impact caused by shifting of a domestic vehicle manual transmission affects the quality of shifting operation of users, the performance of the external con-trol mechanism of gearbox was studied and its structural dynamic response performance was opti-mized to reduce the secondary impact of shifting. By creating the finite element model of the exter-nal control mechanism of the manual transmission and using NASTRAN analysis tool, the frequency response analysis and demonstration are carried out based on the calculation with theoretical deri-vation of mode and frequency response. The experimental results show that the simulation results are accurate and reliable. Finally, the factors that affected the secondary impact were discussed from the system damping coefficient and the stiffness of the cable bracket. The results show that increasing the damping of the shift system, increasing the stiffness of the shift cable bracket and reducing the stiffness of the shift cable joint were beneficial to reducing the secondary impact of the shift.