# Introduction to structural 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

## Introduction to Operating deflection shape | ODS | Part 1

To understand the vibration behavior of a test object, ODS analysis is a simple and effective method. With the help of ODS analysis, all vibration modes and modes of the object in operation are made visible. In this tutorial we will show you how easy it is to visualize the vibration modes of your component. ODS in three steps.

You will need:

• A measurement object
• At least 2 accelerometers (one stays as a reference point)
• A HEAD acoustics compatible frontend
• The following modules of the analysis software ArtemiS SUITE:
- ASM 5000: Creation and handling of the measurement points
- ASM 5004: Data Acquisition
- ASM 5040: Operating Deflection Shape Analysis Module