## Viewing Operational Deflection Shapes (ODS) from a Gas Turbine Generator

As its name suggests Operational Deflection Shape analysis shows the vibration pattern experienced during normal operational condition. This is different to other structural vibration tests such as impact hammer tests, bump tests or shaker tests which require a more controlled excitation force and are used to determine specific characteristics of the structure under test, such as natural or resonant frequencies.

## How Do I Calibrate An Impact Hammer?

The intention of this article is not to present any new scientific theories or ground breaking techniques, but to introduce new users to hammer impact testing and remind seasoned technicians of a method of how to calibrate an impact hammer and/or verify the…

## 2013 Prosig / Portsmouth University Prize Awarded

The 2013 Annual Prosig Prize for Engineering at Portsmouth University has been awarded to Peter Thompson for his project “Vibration Analysis of Aircraft Structures (Airframe)”. Peter completed his study at the School of Engineering this year. His project was supervised by…

## What Is Resonance? (Part 3)

In the previous two articles (What Is Resonance? (Part 1) & What Is Resonance (Part 2)) in this series we have looked at how we can identify a resonant frequency. Now we will discuss what happens next. What do we…

## Prosig to exhibit at Tenth International Conference on Recent Advances in Structural Dynamics (RASD)

Prosig are delighted to have been invited to attend the 10th International Conference on Recent Advances in Structural Dynamics (RASD) to be held at The Institute of Sound and Vibration Research (ISVR) at Southampton University on 12th – 14th July…

## A Simple Frequency Response Function

The following article will attempt to explain the basic theory of the frequency response function. This basic theory will then be used to calculate the frequency response function between two points on a structure using an accelerometer to measure the…

## What Is Resonance?

We hear the word used a lot, but what is resonance? First, in order to explain we have to explain the terms we will use. A period is the amount of time it takes to complete one cycle The number…

## Measuring For Success With A Hammer Impact Test

The following application note shows the steps taken to perform a structural analysis using a hammer impact test on an automotive exhaust pipe structure with the aim of improving the structural damping properties of the exhaust pipe mount. This application…