Noise, Vibration, and Harshness – SSP 861503



Noise, Vibration, and Harshness - SSP 861503 PDF

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

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.

CONTENTS

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

Language: English
Format: PDF
Pages: 84
Size: 1.95 Mb
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