摘要
汽车制动时的NVH性能对于乘车舒适性和防治环境噪声污染具有重要意义。目前常规的仿真方法为复特征值(CEA)法,通常CEA法比实际测试出现的制动尖叫频率点更多,容易造成误判。为此,提出采用时-频域耦合动态仿真方法对盘式制动器的NVH性能进行分析。基于有限元平台ABAQUS,根据国际噪声测试标准SAE J 2521规定的工况,分别采用CEA法和时-频域耦合仿真方法,对制动器的非稳态响应进行了分析,得到了制动器的加速度-频率响应曲线以及制动尖叫的频率点;将时-频域耦合仿真及CEA仿真结果与测试结果进行比较,结果表明:传统的CEA仿真得到的的尖叫频率值过多,相比之下时-频域耦合仿真得到的结果与测试数据更为吻合,能够更精准地预测制动器的尖叫噪声频率值。
During car braking, NVH performance is of great significance for ride comfort and environmental noise prevention. Currently, the conventional simulation method is the complex eigenvalue analysis (CEA) method. But this method usually gets more squeal frequencies than the test results which may cause misjudgments. So, the coupling dynamic simulation method in the time-frequency domain was brought up to analyze the NVH performance of disc brakes. Based on the finite element platform of ABAQUS, and according to the international noise test standard SAE J2521, both the CEA method and the implicit-explicit coupling simulation method were adopted to analyze the unsteady response of a disc brake. And the acceleration-frequency response curve of the brake and the frequency sampling points of the braking squeal were obtained. Both results from implicit-explicit coupling simulation and CEA method were compared with the test results. Results show that the CEA can get more squeal frequencies than the test results, but the results from time-frequency domain coupling method are in good agreement with the test data, which can more accurately predict the frequency values of the brake squeal.
出处
《噪声与振动控制》
CSCD
2016年第1期53-56,共4页
Noise and Vibration Control
基金
国家自然科学基金资助项目(51375519)
重庆交通大学研究生教育创新基金(20130131)
