智能型磁流变式汽车双质量飞轮扭振减振器的设计理论与应用研究

Because of engine torque increasing and the wide application of the diesel engine, driveline torsional vibration plays an increasingly important role in the vehicle vibration. Dual mass flywheel torsional damper (DMF) can isolate driveline torsional vibration better than Traditional torsional damper. So the research of DMF becomes a hotspot in recent years. Torsional stiffness and damping are two main performance parameters of the DMF, and the efficiency of the shock isolation of DMF is decided by the damping value. But at present there is little research on DMF damping, no mature damping selection criteria. The project is planned to start from DMF damping control, to improve the DMF damping device with magneto-rheological fluid, and to study the design theory and the isolation principle of magneto-rheological-DMF. First we build the lumped parameter model of the Magneto-rheological-DMF, and identify and study the mechanical parameters by experimental means and finite element method. And then we establish the transmission-vehicle system model which contains the Magneto - rheological DMF, and design an effective control strategy for Magneto-rheological-DMF damper system to control torsional vibration. Last we manufacture the Magneto-rheological-DMF sample and hardware of control system, and do overall studies by vehicle test. Through this project, the design theory and methods of smart Magneto-rheological-DMF can be obtained and studied

随着发动机扭矩的不断增大和柴油机的广泛应用，传动系扭振在整车振动中占的比例越来越大。双质量飞轮扭振减振器（DMF）能够较好的衰减传动系扭振，近年来成为研究的热点。扭转刚度和阻尼是扭振减振器的两个主要性能参数，阻尼值的大小决定减振器的隔振效率，但是目前鲜有对DMF阻尼的研究，没有成熟的阻尼选择标准。本项目拟从DMF阻尼控制入手，把磁流变液体引入DMF的阻尼装置，对磁流变式DMF减振器设计理论与隔振原理进行研究。首先建立磁流变DMF减振器力学参数模型，通过试验手段和液固耦合非线性有限元方法对力学参数进行识别与研究。然后建立应用磁流变DMF的传动系-整车的系统模型，设计有效控制策略对磁流变DMF减振器系统进行控制仿真与优化。最后试制样件与控制系统硬件，装车进行整车试验与分析。通过本项目的研究，提出智能型磁流变式双质量飞轮的设计理论与方法。

动力传动系扭振问题在柴油机汽车和全轮驱动汽车上表现的相当突出，仅次于发动机振动与路面激励振动。对于传动系扭振问题，目前较为成熟的方法是采用扭转刚度更低，扭转角更大的双质量飞轮扭转减振器，该方式的缺点在于其扭转刚度和阻尼不可调节，不符合汽车多工况需求。本项目针对上述情况，开展的研究内容和取得的成果为：1、建立了汽车传动系统的多自由度扭振模型，分析获得了汽车匀速、加减速行驶以及发动机怠速、点火、熄火、传动系共振等工况下对扭振减振器阻尼的要求。2、通过从刚度设计、阻尼结构设计、磁路设计和总体结构设计等方面着手，设计出一款磁流变双质量飞轮装置，并结合磁流变液的流变特性，对其阻尼力矩进行分析，推导出阻尼力矩与结构参数及励磁线圈电流的对应关系。3、利用AMESim软件建立了磁流变双质量飞轮仿真模型，并进行了整体扭转特性和局部扭转特性的仿真与试验验证。4、对磁流变双质量飞轮进行了控制策略研究，以有效控制汽车多工况下传动系扭振问题。5、设计并制作出磁流变双质量飞轮的控制器，并进行了多工况下汽车整车试验验证。通过该项目的研究结果表明，通过对磁流变双质量飞轮的控制，能够同时满足汽车传动系多工况下的不同扭转阻尼要求，传动系扭振问题得到有效的控制，汽车的驾驶平顺性和乘坐舒适性得到提升。