Friction and contact characteristics play important roles in brake squeal generation, while their heterogeneous characteristics are often neglected. In this paper, a flexible pin-on-disc system model is established. Squeal bench test is carried out to verify the correctness of the model. Random heterogeneous friction coefficients and contact stiffnesses are built and assigned to the model. Evaluation indexes of friction and contact heterogeneities are established. The unstable region and the squeal uncertainty are analyzed. Then, the influence of the heterogeneous friction and contact characteristics on generation of brake squeal is explored based on statistical method and uncertainty concept in the unstable region and the mix region respectively. The results show that when only friction coefficient is heterogeneous, the radius of the center position of friction coefficient is the key influencing factor of brake squeal; when only contact stiffness is heterogeneous, the radius of the center position of contact stiffness is the key influencing factor of brake squeal; when friction coefficient and contact stiffness are both heterogeneous, the mean value of the product of friction coefficient and contact stiffness and the radius of the center position of friction coefficient play critical roles on friction squeal. Besides, squeal tends to occur when the mean value of the product of heterogeneous friction coefficient and contact stiffness and the radius of the center position of friction coefficient are large.

摩擦和接触特性在制动尖叫声的产生中起着重要作用，而它们的异质特性往往被忽视。在本文中，建立了一个灵活的pin-on-disc系统模型。进行了尖叫台架试验以验证模型的正确性。建立随机异质摩擦系数和接触刚度并将其分配给模型。建立了摩擦和接触异质性评价指标。分析了不稳定区域和尖叫不确定性。然后，基于统计方法和不确定性概念，分别在不稳定区域和混合区域探讨了异质摩擦和接触特性对制动尖叫声产生的影响。结果表明，当只有摩擦系数不均匀时，摩擦系数中心位置的半径是制动啸叫的关键影响因素；仅当接触刚度不均匀时，接触刚度中心位置半径是制动啸叫的关键影响因素；当摩擦系数和接触刚度均不均匀时，摩擦系数和接触刚度的乘积的平均值以及摩擦系数中心位置的半径对摩擦尖叫起关键作用。此外，当异质摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径较大时，容易出现尖啸。接触刚度中心位置半径是影响制动尖叫的关键因素；当摩擦系数和接触刚度均不均匀时，摩擦系数和接触刚度的乘积的平均值以及摩擦系数中心位置的半径对摩擦尖叫起关键作用。此外，当异质摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径较大时，容易出现尖啸。接触刚度中心位置半径是影响制动尖叫的关键因素；当摩擦系数和接触刚度均不均匀时，摩擦系数和接触刚度的乘积的平均值以及摩擦系数中心位置的半径对摩擦尖叫起关键作用。此外，当异质摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径较大时，容易出现尖啸。摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径对摩擦尖叫起关键作用。此外，当异质摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径较大时，容易出现尖啸。摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径对摩擦尖叫起关键作用。此外，当异质摩擦系数和接触刚度的乘积的平均值和摩擦系数中心位置的半径较大时，容易出现尖啸。