表面粗糙可渗透带油槽的湿式离合器接合过程分析和数学模型

Analytical and Numerical Modeling of Engagement of Rough,Permeables Grooved wet Clutches

已经开发了粗糙可渗透带油槽的湿式离合器接合的模型,用于确定不同输入参数(作用负荷、油槽面积和摩擦材料的可渗透率)对接合过程的影响。该模型关于表面粗糙度的影响按照Patir和Cheng(1978),其摩擦材料的渗透率按照Natsumeda及Miyoshi(1994)和Beavar及Josph(1967),带油槽的摩擦材料按照最近的逼近方法。该方法简化了雷诺和对油膜厚度和时间的一次一阶差分方程的力平衡方程式。一线性的搜索算法。采用对新模型函数计算的低的计算费用用来求得相同接合特性的一组输入参数组合。作为在该参数空间(Fapp,^Φred)内接合等面描述为这样的设计点组合,该等面无疑给出有关接合时间和表示不可能实现所期望的接合特性的区间的有关数据。输入参数分为接合瞬变部分的影响和稳态部分的影响二类。

A simple mathematical model for the engagement of rough, permeable, grooved wet clutches has been developed and used to determine the effect of various input parameters（applied load, grooved area, and friction material permeability） on engagement. The model includes the effects of surface roughness accord ing to Patir and Cheng（1978）, friction material permeability according to Natsumeda and Miyoshi（1994） and Beavars and Joseph（1967）, and grooving in the friction material according to a new approximation. The approach reduces the system of Reynolds and force balance equations to a single, first-order differential e quation in film thickness and time. A line searching algorithm, exploiting the low computatinonal cost of function evaluations for the new model, is used to find the set of input parameter combinations yielding the same engagement characteristics. This set of design points is presented as an engagement isosurface in the parameter space （Fapp,Фred）- The isosurface implicitly gives information about engagement time, and it shows regions in which the desired engagement characteristics cannot be achieved. The input parameters are classified as those affecting the transient portion of engagement and those affecting the steady-state portion.