为分析摩擦因数为常数时是否会出现曲线啸叫，并探讨摩擦因数对轮轨接触特性和曲线啸叫噪声强度的影响，建立详细的轮轨曲线啸叫噪声预测模型，包括轮轨弹性振动模型、时域相互作用模型和声辐射模型，并用CONTACT软件验证了相互作用模型的正确性。分析结果表明：摩擦因数为常数时，也会出现曲线啸叫。摩擦因数对曲线啸叫频率没有影响，轮对横移量为5 mm、横向蠕滑率为-0.01时，啸叫频率总是与车轮的0节圆3节径轴向模态频率相近；摩擦因数越大，曲线啸叫噪声强度越大；可以用横向力级峰值的个数判断是否会出现黏滑振荡，用接触区域内滑动区所占比例的变化程度表示黏滑振荡的激烈程度，用横向力级最大值或声功率级最大值对应频率预测曲线啸叫频率；提出两个临界摩擦因数：摩擦因数小于0.20时不会出现曲线啸叫，大于等于0.24时会出现啸叫，介于0.20和0.24之间时有可能出现曲线啸叫。
In order to analyze whether the curve squeal is generated when the friction coefficient is constant, and discuss the influence of the friction coefficient on the contact characteristics of the wheel-rail and the intensity of the curve squeal noise, the curve squeal noise prediction model is established. The prediction model includes wheel-rail elastic vibration model, interaction model in time-domain and acoustic radiation model, and the correctness of the wheel-rail interaction model is verified by CONTACT software. The analysis results show that:the curve squeal can also appear in constant friction coefficient. The friction coefficient has no effect on the frequency of curve squeal, and the unstable curve squeal frequency is always related to the 0-nodal-circle and 3-nodal-diameter axial mode of the wheel, when the lateral displacement of wheelset is 5 mm and the lateral creepage is -0.01. The greater the friction coefficient is, the larger the intensity of curve squeal noise is. Whether or not there will be stick/slip oscillation can be determined by the number of peak values of the lateral force level in frequency-domain. The intensity of stick/slip oscillation can be expressed by the proportion of the sliding zone in the contact patch. The curve squeal frequency can be predicted by the frequency of the maximum of the lateral force level or the sound power level. Two critical friction coefficients are proposed:when the friction coefficient is less than 0.20, there will be no curve squeal; the curve squeal will occur when the friction coefficient is greater than or equal to 0.24; and there is a possibility of curve squeal when the friction coefficient is between 0.20 and 0.24.
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