惯性测功机制动尖叫噪声测试程序（适用于配备再生系统的车辆

[中文适用范围]： SAE J3211程序适用于使用单端惯性测功机对摩擦偶件进行评估的盘式制动器的啸叫评估，这些摩擦偶件用于配备再生制动系统的车辆。本文件适用于道路行驶的乘用车和轻型卡车，其总车辆重量额定值不超过4536千克，并且至少配备一个可充电储能系统作为推进动力源。该程序涵盖了以下方面：(a) 惯性测功机的最低能力要求；(b) 夹具的要求和安装；(c) 测试序列，重点在于刹车温度、刹车压力曲线以及代表刹车混合策略的方法。根据本文件，当使用完整悬挂角或完整轴组件进行测试时，若峰值噪声水平在1.25至16kHz范围内达到至少70dB(A)时，即判定为啸叫；而对于未使用完整悬挂角的刹车，啸叫定义为在2至16kHz范围内达到至少70dB(A)。打算使用本文件的测试机构，应基于其在实施SAE J2521方面的专业知识，详细审查对传统模块测试参数（主要是刹车温度和刹车压力）的更改。本文件同样适用于使用机电制动系统来驱动基础制动的车辆。测试请求方和测试机构负责将液压压力水平转换为其等效夹紧力，对于使用机电驱动的刹车。在使用本文件进行底盘测功机测试之前，应详细审查以下内容：(a) 仪器设备，包括车内麦克风；(b) 噪声检测的阈值水平；(c) 前后轴之间的温度控制优先级；(d) 车辆的负载和负载分布；(e) 冷却空气和环境调节；(f) 通道和传感器的详细术语及标签；(g) 再生制动设置以及测试期间的电量状态。在将本文件与其他方法（如软件在环或硬件在环）结合使用以重现再生制动混合之前，应考虑以下内容：(a) 车辆动力总成、混合架构及其适用模型；(b) 旨在重现的实际曲线（例如控制策略、电量状态、测试场景）；(c) 模拟的实际实现方式及其与刹车测功机原生控制系统的集成。本文件不包括其他来源的噪声（例如驻车制动器、电动机和传动系统部件）。 [外文原描述]： The SAE J3211 procedure applies to squeal evaluation for foundation brakes using single-ended inertia dynamometers for friction couples used on vehicles with regenerative braking systems. This document applies to squeal noise occurrences for on-road passenger cars and light trucks with a gross vehicle weight rating of 4536 kg or below and with at least one rechargeable energy storage system as a source for propulsion. The procedure incorporates aspects related to (a) minimum inertia dynamometer capabilities, (b) fixture requirements and setup, and (c) test sequences with emphasis on brake temperatures, brake pressure profiles, and strategies to represent brake blending.For this document, squeal occurs when the peak noise level is at least 70 dB(A) between 1.25 and 16 kHz for tests using full suspension corners or complete axle assemblies, or between 2 and 16 kHz for brakes not using an entire suspension corner.Test facilities intending to use this document, building on their expertise in conducting SAE J2521, shall review in detail the changes to test parameters (mainly brake temperatures and brake pressures) for legacy modules.This document also applies to vehicles with electromechanical braking systems to actuate the foundation brake. The test requester and the test facility are responsible for converting the hydraulic pressure levels into their equivalent clamping forces for brakes using electromechanical actuation.Before using this document 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; (f) detailed terminology and labeling of channels and sensors; and (g) the regenerative settings and the state of charge during the test.Before using this document along with other methods to recreate the regenerative brake blending (e.g., Software-in-the-Loop or Hardware-in-the-Loop), consider (a) the vehicle powertrain, blending architecture and its applicable models, (b) actual profiles intended to recreate (e.g., control strategies, state of charge, test scenarios), and (c) actual embodiment of the simulation and integration with the native controls of the brake dynamometer.This document does not include noise from other sources (e.g., parking brakes, electric machines, driveline components).