Noise and Vibration Control for Engineers

A Training Program for Technical Personnel

Background:

The noise and vibration control field represents a growing aspect of the Mechanical Engineering practice that has been gaining momentum in the recent decades. More and more, we find that engineers are called upon to resolve problems associated with excessive vibration levels and/or excessive production of noise. Designing and developing quiet products that meet the needs of the customer at minimum cost is of paramount importance to many companies.

Problem:

This course will provide engineers and technical personnel with an understanding of: 1)the basic principles of vibration theory and measurement, 2) theory behind and practice of the Modal Analysis technique, 3) the basic principles of acoustics, 4) the use and application of acoustic analysis instruments, 5) an introductory exposure to noise control, and 6) the human and regulatory issues related to noise exposure.

Audience:

Engineering and technical personnel

Overall Objective:

To train engineering and technical personnel on the basic concepts of noise and vibration control engineering.

Topics:

Session Topics covered Learning objectives

1

Basic Vibrations:
  1. Vibration of single degree of freedom (SDOF) systems:
    Free, forced and transient, Damped and undamped, Frequency Response Function (FRF)
  2. Vibration of multi-degree of freedom (MDOF) systems:
    Natural frequencies, Mode shapes, Vibration absorber, Forced response, Different models of damping , Frequency Response Function (FRF)
  3. Vibration of simple continuous systems (String, Rods longitudinal and torsional, Beams/Plates)

2

Analytical and Experimental Modal Analysis:
  1. Modal mass and stiffness, poles and residues
  2. Step-by-step experimental modal analysis of a simple structure

3

Basic Acoustics:
  1. Understand the concept of waves, the acoustic wave equation, and wave types
  2. Description of sound
    • Sound pressure
    • Sound intensity
    • Sound power
Human Response to Noise:
  1. Understand the Decibel scale for measurement of sound levels
  2. Understand the anatomy of the ear and the mechanism of hearing
  3. Learn about the quantification of human response
    • Loudness
    • Annoyance
    • Speech interference
  4. Understand issues related to noise induced hearing loss

4

Noise Criteria, Standards and Regulations:
  1. Understand the regulatory aspects of noise control
  2. Measurement of environmental noise
  3. Learn about hardware performance characteristics
Instrumentation for Noise Control:
  1. Equipment
    • Microphones
    • Sound level meters
    • Tape recorders
  2. Frequency analysis
    • Fixed bands
    • Digital: Fast Fourier Transform and digital filtering
    • Analog

5

Room Acoustics:
  1. Understand direct and reverberant fields
  2. Understand absorption of sound in rooms
  3. Understand the concept of reverberation
  4. Understand the different techniques used for preventing excessive transmission of sound
Sound Transmission:
  • Walls and partitions
  • Barriers
  • Enclosures

6

Acoustical Materials and Structures:
  • Understand proper use of sound dampening materials
  • Closing topics:
  • Review of gear noise and vibration issues and analysis techniques
  • General Problem Solving Approach and Case Studies

  • Time Structure:

    The training will be given in six modules of four-hour each.

    Training Process:

    Evaluation Process in Class:

    The course will consist of lecture accompanied with structured problem solving sessions to reinforce the concepts. Approximately, the participants during the course will solve 10 structured problems.

    The instructor will review the results of each problem session and give immediate feedback on the correct solution methodology.

    Training materials:

    Course offering:

    This course will be offered only when there is demand.
    This course is designed to be offered on-site (i.e., in your company) when needed.

    For more information contact: Dr. Koorosh Naghshineh via email or phone (269-276-3431)