Self Study Program 861503 – Noise, Vibration, and Harshness

Self Study Program 861503 – Noise, Vibration, and Harshness PDF free online

This Self-Study Program focuses on vehicle Noise, Vibration, and Harshness (NVH), their
causes and diagnostic and service procedures to locate and correct NVH concerns.

Modern cars and trucks use a combination of systems to provide the driver with the
safest, most responsive, and comfortable vehicle ever built. Today’s driver has come to
expect a smooth and quiet ride in all operating environments. When vehicle noise, vibration, or ride harshness exceeds the driver’s expectations, it is up to the technician to correct the cause of the customer’s concern.

Vehicle components are being manufactured using lighter weight metals. Lighter weight
metals reduce the overall vehicle weight that reduce emissions and improve fuel economy.
As technologies develop stronger and more lightweight metals this trend will continue.
Lighter vehicle components do not absorb noises and vibrations as well as heavier
components. This leads to an increase in NVH concerns.

Diagnosing NVH concerns has been developed into a logical and almost scientific procedure. This course will provide the Volkswagen technician with concepts to help understand and diagnose NVH concerns.

Course Goals

This course will enable you to:

  • Identify the terminology used in diagnosing Noise, Vibration, and Harshness (NVH)
    concerns
  • Identify the different types of NVH
  • Identify the steps of the NVH systematic diagnostic approach
  • Identify the road test procedures necessary to isolate a noise or vibration
  • Calculate NVH frequencies necessary for component classification
  • Identify test equipment and tools used in diagnosing and correcting NVH concerns
  • Identify, diagnose, and specify the component causing the NVH concern

CONTENTS

  • Course Goals
  • Introduction
  • Theory
    • Characteristics of Noise, Vibration and Harshness (NVH), Generation of
      Noise and Vibration, Sound and Sound Waves, Audible Range of Sound, NVH
      Terminology, Types of Noise, Compelling Force and Vibrating Body, Vibration,
      Vibration Transfer Path, Vibration Order, Types of Vibration, Ride Comfort
  • Diagnosis
    • Getting Good Information from Service Advisors, The Four Steps, Diagnosing
      and Solving Customer Concerns, Other Information Sources, Pre-Road Test
      Inspection, Road Test Tips, Road Testing
  • Engine Vibrations
    • Engine Speed-Related Vibrations, Types of Engine Vibrations, Engine Vibration
      Formula, Engine Accessory Formula, Types of Engine Noise, Exhaust Noise,
      Engine Firing Frequency Formula
  • Vehicle Speed Vibrations
    • Tires and Wheels, Tire Vibration Formulas, Drive Shaft Frequency Formula,
      Drive and Axle Shafts, Driveline Vibration, Transmission Noise and Vibrations,
      Differential Operation, Driveline Snap, Suspension Components, Steering
      Components
  • All-Wheel Drive Systems
    • 4Motion All-Wheel Drive, 4XMOTION, Haldex Coupling
  • Tools
    • Sirometer, EVA II, ChassisEAR, Hunter’s GSP9700 Series, Other Tools
  • Glossary
  • Diagnostic Flow Chart
  • Knowledge Assessment

The Self-Study Program provides you with information regarding designs and functions. 
The Self-Study Program is not a repair manual.
For maintenance and repair work, always refer to the current technical literature.

Language: English
Format: PDF
Pages: 84

Self Study Program 861503 – Noise, Vibration, and Harshness PDF free online

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