Are My Hammer Impact Results Valid? (3) Time Invariance
As mentioned in our previous two articles, when performing experimental modal testing of a structure or component using impact (or ping) testing, it is important to consider and verify the…
Are My Hammer Impact Results Valid? (2) Reciprocity
As mentioned in our previous article, when performing experimental modal testing of a structure or component using impact (or ping) testing, it is important to consider and verify the validity…
Are My Hammer Impact Results Valid? (1) Linearity
When performing experimental modal testing of a structure or component using impact (or ping) testing, it is important to consider and verify the validity of any results. A modal analysis…
Hammer Testing: Free or fixed support?
A vital question to be asked before performing hammer testing is - how do I support the testing object? What fixing mechanism to use? Or technically, what are the desired…
What Is A Hammer Test Or Hammer Impact Test?
This is often also known as Modal Testing. It is a method of testing that allows us to calculate the natural frequencies (modes), modal masses, modal damping ratios and mode shapes…
What is the difference between Operating Deflection Shapes (ODS) and Operational Modal Analysis (OMA)?
ODS = Motion of structure vibrating naturally (for example bridge vibration) or when excited by an unknown force (for example generator vibration). Prosig’s Structural Animation software performs ODS analysis.
OMA = Modal Analysis
Prosig’s Modal Analysis software performs OMA. (more…)
How To Analyze Noise & Vibration In Rotating Machines
In this article we will look at the basic steps needed to measure noise & vibration in rotating machines. We won’t look in great detail at some of the techniques involved – we deal with these elsewhere on the blog. This material is suitable for a newcomer to the field who understands the basic concepts of noise & vibration analysis, but has not dealt with rotating machinery before. (more…)
