In this study, noises generated when opening the rear door of a vehicle are identified, which has recently been receiving renewed attention in the automotive industry. To confirm the characteristics of door opening noise, the noise and vibrations in a rear quarter panel and a rear outer door panel were measured experimentally. Furthermore, the modal testing on these panels was conducted such that the natural frequencies and mode shapes were extracted. By combining not only a noise signal but also the vibration signals and the results of modal testing, the radiation position of the peak frequencies of the door opening noise was identified. Meanwhile, a multi-body dynamics model was established and simulated for a latch system to find the source of the opening noise, and the results of the simulation were verified through simple experiments. We found that a sudden change in the contact force between a claw in the latch system and a striker excites the rear quarter panel and the rear outer door panel, resulting in a door opening noise. In addition, it was also confirmed that the noise increases with the elastic force caused by a deformation of the weather strip.

在这项研究中，识别出打开车辆后门时产生的噪音，最近在汽车工业中受到了越来越多的关注。为了确认开门噪声的特性，通过实验测量了后四分之一面板和后外门面板中的噪声和振动。此外，在这些面板上进行模态测试，以便提取固有频率和模态形状。通过不仅组合噪声信号，还组合振动信号和模态测试结果，确定了开门噪声峰值频率的辐射位置。同时，建立了锁存系统的多体动力学模型，并对其进行了仿真，以寻找开启噪声的来源，并通过简单的实验验证了仿真结果。我们发现，闩锁系统中的爪子和撞针之间的接触力突然改变，会刺激后四分之一面板和后外门面板，从而导致开门噪音。另外，还证实了噪声随着挡风雨条的变形引起的弹力而增加。