高速湿式多片离合器流固耦合振动研究

项目名称： 高速湿式多片离合器流固耦合振动研究

项目编号： No.51305032

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 彭增雄

作者单位： 北京理工大学

项目金额： 25万元

中文摘要： 试验表明，高速分离状态湿式多片离合器线速度大于某临界值时，会发生摩擦片之间的强烈碰振现象，引起带排转矩及带排功率损失的急剧上升；前期的振动频谱分析表明该现象为流固耦合诱发的宽频带流致振动和流致失稳，其诱发机理有别于单一的窄频带响应振动特性的漩涡脱落或者流弹不稳定诱发机理。本申请针对该流固耦合振动问题，拟建立湿式多片离合器非线性约束流固耦合动力学模型，并进行摩擦片的流固耦合作用数值模拟；探讨非保守振动系统的能量输送与反馈通道，研究能量输入与振动相位的关系，揭示流固耦合诱发振动及其失稳机理；研究流固耦合作用下的结构有效刚度及流体阻尼的变化规律，探讨摩擦片沟槽优化在气液两相流动状态下的附加流体阻尼对振动的抑制。项目成果结合申请人前期的研究工作，可形成湿式多片离合器低速全膜润滑、中速空化流动和高速流固耦合振动的统一带排转矩模型，用于离合器性能预测和参数设计，减小功率损失，提高传动效率。

中文关键词： 湿式离合器；流固耦合振动；带排转矩；稳定性；碰撞

英文摘要： Experimental results show that flow-induced vibration or flow-induced instabilities will happen between frictional plates in high speed multi-plate wet clutch if the work speed is up to a critical value. This leads to suddent increasing of drag torque and power loss. The analysis of frequency spectrum of vibration signal reveals that the flow-induced vibration of wet clutch has wide frequency spectrum, and the frequency spectrum is different with the single induced mechanism resulted in narrow frequency response such as vortex shedding and fluid-elastic instability.To solve the problem of flow-induced virbration,a dynamical and nonlinear FSI model of multi-plate wet clutch is presented, and the numerical simulation of the flow-induced vibration is also accomplished. The proposer attempt to discuss the power transportation and feedback channel of the non conservation sysytem and investigate the relationship between power input and vibration phase, then reveal the mechanism of flow-induced vibration and instability. On the basis of dynamical model and instability mechanism, the regulation of effective stiffness and fluid damping under fluid-solid interaction is researched, and vibration restain from accessional fluid dampig caused by the grooves of frictional plate under two phase flow condition is also discussed.

英文关键词： wet clutch；flow-structure coupled；drag torque；stability；impact vibration