UAFM 101 - Noise, Vibration, and Harshness

Skills and knowledge required to pinpoint Noise, Vibration, and Harshness (NVH) related concerns to a vehicle system. Characteristics and aspects of NVH, use of NVH diagnostic tools and equipment, and repair methods.

Course Learning Outcomes:

Evaluate noises, vibrations, and harshness-related malfunctions in wheel/tire, engine, and driveline systems.
Assess causes of and solutions to vibrations associated with wheel and tire systems.
Analyze wind noise and water leak sources, causes,and diagnostic and repair methods.
Diagnose NVH concerns using Ford’s VMS system and associated tools.

Outline:

NVH Fundamentals
1. Terminology
2. Units of measure
  1. Frequency
    1. Pitch
    2. RPM
    3. Hertz
  2. Amplitude
    1. Volume
3. Order Of Vibration
  1. First Order Vibration
  2. Second Order Vibration
  3. Third Order Vibration
  4. Fourth Order Vibration
    1. Component group
      1. Wheels/Tires/Axles
      2. Powertrain
      3. Driveline
Measuring tools and diagnostic methods
1. Use of standardized, detailed concern documentation
2. Test Procedures
  1. Vibration
    1. Vehicle Measurement System Software
    2. Other electronic calculative devices
    3. Sirometer
    4. Reed Tachometer
  2. Sound
    1. Sound amplification devices
    2. Ultrasonic penetrating devices
  3. Harshness
    1. Like units
      1. Customer Expectations
Solutions and repair methods
1. Vibrations
  1. Wheels/Tires/Axles
    1. Dynamic balancing
      1. RoadForce®
    2. Runout
    3. Match-mounting
    4. Indexing
  2. Powertrain
    1. Powertrain mount neutralization
    2. External component isolation and replacement
  3. Driveline
    1. Operating angle measurement and adjustment
    2. Driveshaft indexing
    3. Driveshaft balancing