Abstract
To improve the understanding of brake creep groan, both experimental and numerical studies are conducted in this paper. Based on a vehicle road test under the condition of downhill, complicated stick-slip type motion of caliper and its correlation with the interior noise were analyzed. In order to duplicate these brake creep groan phenomena, a transient dynamic model including brake corner and subsystems was established using finite element method. In the model, brake components were considered to be flexible body, and the subsystems including driveline, suspension, tire, and vehicle body were considered to be rigid body. Simulation and experimental results of caliper vibration in time and frequency domains were compared. It was demonstrated that the new model is effective for the prediction and analysis of brake creep groan, and it has higher accuracy compared to the previous model without the subsystems. It is also found that the lining and caliper not only have stick-slip motion in each coordinate direction but also have translational and torsional movements in plane, which relate to the microscopic sticking and slipping, friction coefficient, and forces, as well as the contact status at the friction interface.
Highlights
In recent years, brake noise, vibration, and harshness (NVH) has become one of the most important issues for the rating of vehicle
Due to the wide use of vehicles equipped with automatic transmission and the increasing of traffic congestion in cities, the incidence and user complaints of brake creep groan increase dramatically
In order to analytically and numerically reproduce these phenomena and fill the void in literatures, we propose an object-oriented transient dynamic model of brake corner and subsystems using FE model
Summary
Brake noise, vibration, and harshness (NVH) has become one of the most important issues for the rating of vehicle. Creep groan is generally caused by the stick-slip motion between disc and pads and it is a self-excited vibration of the brake assembly. Friction oscillator models with single DOF [6, 7] and two DOFs [8, 9] have been established, and the caliper vibration acceleration in time domain and the bifurcation behavior in phase plane have been used to evaluate creep groan. The components of suspension and driveline system are neglected, which have effects on the characteristics of brake creep groan. In the previous FE models of creep groan, some subsystems such as suspension and driveline components were neglected. The spatial motions of pads and caliper and the microscopic process at the friction surfaces, as well as their relationships with the macroscopic dynamics of creep groan, have been poorly understood. Macroscopic and microcosmic stick-slip motion and the spatial motion of lining and caliper, as well as the vibration characteristics of caliper, are analyzed and discussed
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