周向长弧形弹簧双质量飞轮阻尼特性研究及其试验验证

Research and Experimental Verification on Damping Characteristics of Circumferential Arc Spring Dual Mass Flywheel

通过分析车辆行驶时各种工况下扭振频率和振幅的区别,得出周向长弧形弹簧双质量飞轮扭振阻尼器(DMF-CS)工作时理想的阻尼特性。结合机械系统动力学和摩擦学原理,推导出DMF-CS黏性阻尼特性数学解析式。研究与试验结果表明:车辆正常行驶时,主次飞轮间转角有小幅振动,DMF-CS形成局部减振特性,表现出较低的刚度及阻尼特性;当发动机转速通过传动系统共振区时,主次飞轮间产生较大的转角,DMF-CS形成整体减振特性,表现出较低刚度和高阻尼特性;发动机加载过程中,主次飞轮间转角变化较大并伴随着低频振动,DMF-CS表现出低刚度和较高的阻尼特性,通过摩擦耗能的方式减小振幅。DMF-CS阻尼特性能够很好地满足车辆行驶要求,同时试验结果与理论计算结果较吻合,验证了理论分析结果的正确性。

By analyzing torsion vibration frequency and amplitude under various vehicle driving modes, an ideal torsion damping characteristic for the circumferential arc spring dual mass flywheel （DMF-CS） was obtained and its analytical formulas were derived based on mechanical dynamics and tribology theory. Re- search and experiments validate that in vehicle normal driving modes, the torsional angle vibration between two masses is very small, the DMF-CS exhibits a low spring rate and low damping characteristics, when the engine speed passes through the powertrain resonance zone, the torsional angle becomes larger, it exhibits a lower spring rate and high damping characteristics, and in engine loading process the torsional angle varies greatly, being accompanied with low frequency vibrates, it exhibits a lowest possible spring rate and higher damping characteristics and dissipates the natural vibration energy to lower vibration amplitude. It can be concluded that the DMF-CS damping characteristics can well fulfill the requirements of vehicle driving modes. In addition, the calculation results are in good agreement with the experimental results, proving the theoretical analysis to be reliable.