TITLE: Squeak and Rattle Evaluation Testing of Seats CETP: 01.10-L-413 Supersedes: None 201004 Page 1 of 36
1.0 INTRODUCTION
The goal of this procedure is to perform Squeak & Rattle noise evaluation of Seats (1st,
2nd, and 3rd row) during the DV/PV testing phase for Cars and Trucks by using subjective listening and objective time varying N10 loudness measurements in sones.
1.1 COMMONALITY. The test may be performed at Ford Motor Company test facilities or at
suppliers using equivalent equipment and sound measurement tools. For the objective
measurements Head Acoustics' Artemis system, MTS I-DEAS, or Bruel & Kjaer's Sound
Quality type 7698 are recommended.
1.2 Proposed revisions to this procedure must be submitted per FAP03-179.
2.0 INSTRUMENTATION
2.1 The equipment listed in Table 1,or equivalent, is needed to perform the sound recording
portion of this test.
2.2 All test measurement equipment must be calibrated and maintained per FAP03-015, Control,
Calibration, and Maintenance of Measurement and Test Equipment.
福特公司
2.3 All applicable safety guidelines and procedures must be followed.
2.4 All instruments must be calibrated within twelve months of the test with reference standards
calibrated on 12 month intervals, using primary standards directly traceable to the NIST.
Required pre-test calibration is described in Section 4.1.
2.5 Accelerometers that are used must be able to operate in the range of -20 to +180 degrees F
without loss of accuracy.
2.6 Dynamic analyzer for vibration and sound measurement analysis and recording.
Functions must include:
•300 Hz high-pass filter
•N10 percentile loudness analysis
•Time capture
•Engineering unit scaling
•Disc or electronic storage
•Graphic output capability.
2.7    A sound pressure measurement system with a minimum upper frequency limit of 10 kHz.
a. ANSI S.1.4, Type 1 sound level meter or microphone with AC signal output, over- range
indication, linear or A weighted measurement modes, and adjustable center frequency 1/3
octave filter.
Engineering Standards & Systems Engineering (ESSE) Printed copies are uncontrolled.
翻译版说明：划线部分为本人不太确定的部分，请读者运用所擅长的专业知识斟酌再决定。
１．０  介绍
本流程目的是为了在汽车和卡车的ＤＶ／ＰＶ测试阶段中，通过运用主观听力和记录随时间而变
化的客观Ｎ１０响度测量值（以宋为单位），来对座椅（前三排）进行异响噪声评估。
１．１  通用性。该测试可以通过福特汽车公司的实验设备或者供应商运用等效设备和声响测量
工具来完成。对于客观测量，推荐使用以下工具：Ｈｅａｄ　Ａｃｏｕｓｔｉｃｓ＇　Ａｒｔｅｍｉｓ　ｓｙｓｔｅｍ，　ＭＴＳ　Ｉ－ＤＥＡＳ，　或者　Ｂｒｕｅｌ　＆　Ｋｊａｅｒ＇ｓ　Ｓｏｕｎｄ　Ｑｕａｌｉｔｙ　ｔｙｐｅ　７６９８。
１．２  针对本流程的提议修改必须符合ＦＡＰ０３－１７９的要求。
２．０  使用仪器
２．１  记录测试声响部分所需要的仪器在Ｔａｂｌｅ　１　中已经列出。
２．２  实验测量所需的所有设备必须根据ＦＡＰ０３－０１５检测测试设备的控制、标定及测量维护要
求进行标定和维护。
２．３  必须遵守所有适用的安全指导与程序。
２．４  所有的设备必须在该测试的１２个月之内完成标定，根据１２个‘月间隔’标定标准，通
过运用主要标准可以直接追踪到ＮＩＳＴ。所需的测试前预先标定会在４．１部分进行说明。
２．５  所用的加速度计（Ａｃｃｅｌｅｒｏｍｅｔｅｒｓ）操作范围须为　－２０至　＋１８０华氏度，并且要求精确。
２．６  振动动态分析仪，声音测量分析及记录。
      须包含以下功能：
      ？  ３００　Ｈｚ　高通滤波器
      ？  Ｎ１０百分位响度分析
      ？  　时间捕捉
      ？  　工程单位换算
      ？  　光盘或电子存储
      ？  　图形输出能力
２．７  声压测量系统的最低频率上限为１０　ｋＨｚ。
      ａ．　ＡＮＳＩ　Ｓ．１．４，　Ｔｙｐｅ　１  声级计或者带有交流信号输出，具有超过范围提示功能，线性的
或者加权测量Ａ模式的微音器，以及可调式中心频率１／３倍频程滤波器。
      ｂ．　耳机和扩音器分别连接过滤信号输出。
TITLE: Squeak and Rattle Evaluation Testing of Seats  CETP:  01.10-L-413 Supersedes: None
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b. Headphones and amplifier, interfaced with the filtered signal output. 2.8
OPTIONAL
Vibration and sound measurement analysis equipment may have the following options: • 1/3 and 1 octave band analysis • Peak channel hold • Stable average • Transfer function (FRF) • Power spectral density (PSD)
• N2 and N5 percentile loudness analysis
• Sound intensity measurement and analysis – used to locate and quantify noise emissions.
2.9
PREFERRED SYSTEM / ALTERNATIVES
The equipment preferred by Ford Motor Company for this test is the Head Acoustics' Artemis
system, MTS I-DEAS, or Bruel & Kjaer's Sound Quality type 7698. 2.10
All test measurement equipment must be calibrated and maintained per FAP03-015, Control, Calibration, and Maintenance of Measurement and Test Equipment. 3.0 EQUIPMENT AND FACILITIES 3.1
TEST CHAMBER
An enclosed room to achieve the following acoustic conditions, is required. The chamber interior must:
3.1.1  Be large enough to contain the fixture, seats, and acoustic materials, and allow human
observation and sound measurements from all directions around the seats.
3.1.2  The background noise level, including all fixturing but no test parts, while the vibration system
is running, shall not exceed an N10 percentile loudness of 2.0 sones over a 1 minute time
interval when measured at a point 250 mm above the center of the table while running a vehicle  drive file (Figure 2) and no seat samples are attached. Operator must be capable of conducting noise evaluations and have "normal" hearing function. 3.1.3
Provide required temperature (capable of -20 deg F to 120 deg F) and humidity control. 3.2
VIBRATION SYSTEM
3.2.1    A minimum 3 degree of freedom (DoF) electro-dynamic shaker table, (Figure 1) capable of
producing 0.75 g's from frequencies of 5 Hz to 100 Hz, with a control system capable of reproducing sine, random, and time based vibration files.
２．８　可选项
    　振动和声音检测分析设备可以有以下选择：
？　１／３倍频程带分析　和　１倍频程带分析；
？　最高频保持；
？　稳定的平均数值
？　转移函数（频率响应函数）；
？　功率谱密度（ＰＳＤ）；
？　Ｎ２和Ｎ５百分位响度分析；
？　声音强度检测及分析－－用来定位和量化噪音发射；
２．９　优先系统／可选方案
该项测试设备首选福特汽车的头戴声学Ａｒｔｅｍｉｓ系统，　ＭＴＳ　Ｉ－ＤＥＡＳ，或者Ｂｒｕｅｌ　＆　Ｋｊａｅｒ＇ｓ
　声音质量　７６９８型号（Ｈｅａｄ　Ａｃｏｕｓｔｉｃｓ＇　Ａｒｔｅｍｉｓ　ｓｙｓｔｅｍ，　ＭＴＳ　Ｉ－ＤＥＡＳ，　ｏｒ　Ｂｒｕｅｌ
　＆　Ｋｊａｅｒ＇ｓ　Ｓｏｕｎｄ　Ｑｕａｌｉｔｙ　ｔｙｐｅ　７６９８）。
２．１０　所有的测试设备必须按ＦＡＰ０３－０１５测试设备的控制，校验，维护要求进行校验和维护。
３．０　设备和设施
３．１　测试箱
  　一个密闭空间来测试以下声学条件，内部必须满足：
３．１．１　空间足够大以便容纳夹具，座椅，声学材料，允许人员从座椅周围所有角度观测和检测声音。
３．１．２　运行车辆驱动文件（图２（Ｆｉｇｕｒｅ　２）），不要碰到座椅部件，测试点位于桌子中心上
方２５０ｍｍ处，　当振动系统工作时，所有检具（测试部件除外）的背景噪音级别在１分钟间
隔不能超过２．０宋的一个Ｎ１０百分位响度。测试员必须有评估噪音和正常的听觉功能。３．１．３　提供要求的温度（－２０华氏到１２０华氏）和湿度控制。
３．２　振动系统
３．２．１　最小自由度为３度的电子动态振动桌一张，（图１（Ｆｉｇｕｒｅ　１））要求从５Ｈｚ到１００Ｈｚ
的频率范围内能够产生０．７５ｇ’ｓ，运用能够产生正弦、随机、基于时间的振动图像的控制系统。
TITLE: Squeak and Rattle Evaluation Testing of Seats  CETP:  01.10-L-413 Supersedes: None
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3.2.2    A means of measuring seat back movement.
3.2.3 Include devices to restrain cross-axial motion of the test fixture in each axis (not exceed 20% of
the axial level at the center of the fixture/exciter interface). Simultaneous, multiaxial (6 DoF) motion and control is not required. 3.3
VIBRATION CONTROL EQUIPMENT (and/or Time History Reproduction)
As required to maintain the random and sinusoidal vibration levels at the specified points on the sample(s). The system must provide: 3.3.1 Graphic output capability to document test levels.
3.3.2 For random vibration, control with sufficient dynamic range to overcome poor transmissibility
in the test fixture and meet the specified levels of the vibration profiles, Figure 2. 3.4
FIXTURES
3.4.1 Microphone fixture for sound measurements.
3.4.2 Component fixture simulating actual vehicle installation, including hardware and brackets and
adequate support of any necessary surrounding interior components. The fixture must:
• Have transmissibility (therefore, stiffness) to allow for control of the vibration level at all points where the sample mounting bracket is attached to the vibration fixture. • Emit no noise that might interfere with sound measurement. • Allow access for sound measurements on all sample surfaces.
It is recommended that the vibrator mounting fixture and shaker head have a natural frequency greater than 120 Hz.
4.0 SAMPLE PREPARATION 4.1
SYSTEM CALIBRATION
Prior to each test, calibrate microphones, signal conditioners, and sound analysis equipment AS A COMPLETE SYSTEM using a reference standard sound source (e.g., piston-phone). 4.2
TEST SETUP
4.2.1 Vibration Amplitude and Squeak & Rattle Tests:
4.2.1.1 Mount the production intent, fully trimmed seat assembly in its design position to the shaker
table. If the rear seats have body mounted strikers or latches, they must be mounted to the fixture such that they simulate the vehicle's local stiffness. 4.2.1.2 Where applicable, position the seat back in normal design position. If the seat has manual
tracks, position the seat full forward. If power, adjust to 6 mm rearward of the forward most stop.  If there is a vertical adjustment, it should be at the midpoint of it's travel. Ensure that all seat back, track, and folding latches are locked.
３．２．２　测试座椅后背运动的方式。
３．２．３　包括抑制试验夹具在每个轴的交叉轴向运动的装置？（不超过？２０％轴向水平中心夹具／励磁机接口）。同时，多轴？（６？自由度）运动和控制不是必需的。
３．３？振动控制设备？（和／或　时间历史再现）　
按照规定，在样品的一些指定点处保持随机和正弦振动级别。该系统设备必须提供：３．３．１　？图形输出文档以记录测试等级。
３．３．２？对于随机振动，要求要具有足够的动态范围来进行控制，以克服在测试检具的传递性差和满足指定的振动配置文件所规定的特定标准，图？２（Ｆｉｇｕｒｅ　２）。
３．４？夹具
３．４．１？声音测量所需的扩音器设备。
３．４．２？组件夹具模拟实际车辆安装，其中包括五金件（硬件）和支架，以及任何必要的周围内部组件的足够支持。夹具必须：
  ？？有传递性（因此有刚度）以便在所有点进行振动级别控制，在这些点处的样件安装支架紧靠到振动检具。
  ？？不能产生可能干涉测量的噪音。
  ？？所有样品表面允许噪音测试。
建议振动器安装检具和振动头自然频率大于１２０Ｈｚ。
４．０？样品准备
４．１？系统标定
每次检测试验之前，运用声源参考标准（如活塞声音）对微音器、？信号调整器，和噪音分析设备作为一个完整系统进行校准。
４．２？测试设置
４．２．１？振动振幅及异响噪声测试：
４．２．１．１？　在设计位置安装完全切好边的座椅总成到振动桌。如果后排座椅安装有连接车身的击板（　ｂｏｄｙ　ｍｏｕｎｔｅｄ　ｓｔｒｉｋｅｒｓ）或者限位梢，必须将它们安装到检具来模拟车辆的局部刚度。４．２．１．２　在适当情况下，把座椅靠背放到正常设计位置。如果座椅有手动滑轨，将座椅完全向前放置。如果是电动的，则向后调节到距离前止点的６ｍｍ处。如果有高度调节，则调到中间
位置。确保座椅靠背、滑轨，折叠限位梢均已锁定。