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首页> 外文会议>SAE Brake Colloquium Exhibition >Brake Impedance Test Stand - Modal Testing of Brake Pads under Pressurized Condition Using 3D SLDV and a Scalable Automatic Modal Hammer
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Brake Impedance Test Stand - Modal Testing of Brake Pads under Pressurized Condition Using 3D SLDV and a Scalable Automatic Modal Hammer

机译：使用3D SLDV和可伸缩式自动模锤在加压条件下制动垫的制动阻抗试验台 - 模型测试

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Brake squeal is an NVH issue experienced by brake systems and vehicle manufacturers for decades. This leads to customer dissatisfaction and the questioning of the quality of the brake system. Advanced testing tools, design modification, dynamometer testing, vehicle validation etc., are performed to study, analyze and eliminate this problem. But still it continues to exist nowadays. One of the most important reasons is the complexity of the brake pad having non-linear material properties. Therefore, it is imperative to understand the behavior of the brake pad in terms of its dynamic properties (eigenfrequencies, damping and mode shapes) under varying boundary conditions. Experimental Modal Analysis (EMA) is used to study the dynamic properties of any structure and is generally performed under free-free boundary conditions. An approach to study brake pads under pressure condition is a step towards reality, as brake pads squeal only during braking events. Therefore, the Brake Impedance Test machine (BIT) was developed. This work describes the development of the BIT to study brake pads under different piston compression loads, analyzing their results and proposing an approach to standardize the testing procedure. The brake pads are excited by a Scalable Automatic Modal hammer (SAM), with a precise controllable force level. The vibration response is measured contactless using a 3D Scanning Laser Doppler Vibrometer (3D SLDV). This research, under these conditions and advanced techniques, results in dynamic characteristics of brake pads closer to those in a real braking event. These results can be correlated with brake dynamometer data for further validation. The conclusions of these upcoming studies will lead to effective brake pad parameters for a robust brake design against squeal research.
机译：制动尖叫是由制动系统和车辆制造商经历的NVH问题，几十年。这导致客户不满和制动系统质量的质量。进行高级测试工具，设计修改，测功机测试，车辆验证等，以研究，分析和消除此问题。但现在仍然存在它。其中一种最重要的原因是制动垫具有非线性材料性质的复杂性。因此，在不同边界条件下，必须了解制动垫的行为（特征频道，阻尼和模式形状）。实验模态分析（EMA）用于研究任何结构的动态性质，通常在无自由边界条件下进行。在压力条件下研究制动垫的方法是迈向现实的一步，因为在制动事件期间刹车垫仅尖叫。因此，开发了制动阻抗试验机（位）。这项工作描述了在不同的活塞压缩负载下研究制动垫的比特，分析结果并提出标准化测试程序的方法。制动衬块通过可伸缩的自动模态锤（SAM）激发，具有精确可控的力水平。使用3D扫描激光多普勒振动计（3D SLDV）测定振动响应。在这些条件和先进技术的情况下，该研究导致更靠近真实制动事件中的制动垫的动态特性。这些结果可以与制动测功机数据相关联，以进一步验证。这些即将到来的研究的结论将导致强大的制动设计对抗尖叫力研究的有效制动垫参数。

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