轮胎偏滚特性模型及其在飞机机轮摆振中的应用

An Approximate Tire Cornering Characteristics Model and Its Application in Aircraft Wheel Shimmy

提出了一种二阶近似的轮胎偏滚力学特性模型。以该模型为基础，研究了轮胎偏滚刚度对飞机机轮摆振的影响。结果表明，轮胎偏滚刚度是影响飞机机轮摆振的重要参数。

We present an approximate secondorder tire cornering characteristics model. Compared with the existing firstorder cornering characteristics models, which can be used only for stable state motions, our model is suitable for unstable state motions. Both the firstorder model and ours are used for shimmy analysis of a real type of aircraft, and the results in Fig.1 reveal that the firstorder model leads to a stable region (above the lower curve of Fig.1) that is too large, while our model leads to a smaller stable region (above the upper curve). The two curves intersect at a ground speed that is too low for wheel shimmy to occur. We use our model to compute the influence of tire cornering stiffness on aircraft wheel shimmy and find that tire cornering stiffness is one key tire parameter which influences shimmy. In Fig.2, the tire cornering stiffness K y for the same real type of aircraft is 1.840×10 5 N . Increasing K y reduces the stable region (the upper two curves) and decreasing K y increases the stable region(the lower two curves).