标准摘要
[中文适用范围]： SAE J2521 程序适用于总车辆总重低于 4,540 公斤的公路客车和轻型卡车的高频尖叫噪声发生。该程序结合了高温和低温测试矩阵，但没有完全考虑环境对制动尖叫的影响。目前该领域正在进行大量研究，并且有可能纳入未来的修订中。就本测试程序而言，尖叫声定义为：对于使用全悬架角或全轴组件的测试，在 1.25 kHz 至 16 kHz 之间，或在 2 kHz 至 16 kHz 之间，峰值噪声水平等于或高于 70 dB(A)。刹车不使用 [外文原描述]： The SAE J2521 procedure applies to high-frequency squeal noise occurrences for on-road passenger cars and light trucks below 4540 kg of GVWR. The procedure incorporates high-temperature and low-temperature test matrixes but does not fully account for the effects of the environment on brake squeal.For this test procedure, squeal occurs when the peak noise level is at least 70 dB(A) between 1.25 kHz and 16 kHz for tests using full suspension corners or full axle assemblies or between 2 kHz and 16 kHz for brakes not using a full suspension corner.Before using this recommended practice for chassis dynamometer testing, review in detail the specifics related to at least (a) instrumentation, including in-cabin microphones, (b) threshold levels for noise detection, (c) temperature control priority between the front and rear axles, (d) vehicle loading and load distribution, (e) cooling air and environmental conditioning, and (f) detailed nomenclature and labeling of channels and sensors.Cross Reference: IEC61672-1,IEC61672-2,IEC61672-3,J2598_202012,J2625_201707,J2786_201712,J2789_201809,J2933_202209,J3001_201604,VDA300,VDA303,VDA305,VDA306
英文名称Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles without Regenerative Systems