Introduction to modal analysis

Introduction to modal analysis | Part 1 - What is a mode shape? | First steps

In this first video we will teach you the basic understanding of a "mode shape". This knowledge of the fundamentals of modal analysis is necessary to start an own impact testing data acquisition.


Defining Points and Coordinates | Introduction to Modal Analysis | Part 2

We will teach you how to start a modal analysis on an object:

  • The first step is to define your measuring points.
  • Next, define a suitable coordinate system for your test object.
  • Modal analysis is much easier, if these first steps have been correctly made.

Roving Hammer Method | Introduction to Modal Analysis | Part 3

In this video you will learn the method „Roving Hammer“ to acquire the data for a modal analysis.
We’ll give you a brief overview about the following issues of this analysis method:

  • the principle of the roving hammer method
  • what sensors are required (accelerometer and impulse hammer)
  • the necessary quality check of each strike (strike was good or bad)
  • a typical analysis result and its interpretation

Roving Accelerometer Method | Introduction to modal analysis | Part 4

In this video you will learn the method „Roving accelerometer“ to acquire the data for a modal analysis.
We’ll give you a brief overview about the following issues of this analysis method:

  • the principle of the roving accelerometer method
  • advantages of this testing method
  • what sensors are required (accelerometer and impulse hammer)
  • the necessary quality check of each strike (strike was good or bad)
  • a typical analysis result and its interpretation

Different hammer tips | Introduction to modal analysis | Part 5

In this video you will learn why an impulse hammer is supplied with different tips.
We will teach you:

  • how the different hammer tips effect the excitation of the measurement object
  • the handling of the tips
  • the obtained frequency ranges

Right sampling rate and block size for impulse tests NVH | Modal Analysis | Part 6

In this video we will teach you how to set up the analysis parameters for your impulse measurements:

  • how to understand the relationship between sampling rate and chosen block size to get a certain frequency resolution
  • you’ll see in a practical example how this relationship works, and what else must be considered in the setup for a modal impact testing