Sound, Vibration & Acoustics Digest #8
To welcome you to 2015 here's our latest collection of news articles, videos and other miscellaneous links on noise, sound, acoustics and vibration that have caught our eye over the…
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…
Sound, Vibration & Acoustics Digest #7
Chip/crisp packets, smartphones, the spooky sounds in space and the absolutely fascinating Diana Deutsch Speech to Song Illusion; welcome to our latest digest Extracting audio from visual information https://newsoffice.mit.edu/2014/algorithm-recovers-speech-from-vibrations-0804Algorithm recovers…
A Guide To Resonance
Our articles on how to measure resonance and natural frequency are always amongst our most popular posts. This isn't surprising considering what an important concept this is to the measurement…
DATS Multi Plane Balancing Tutorial (Part 4)
https://www.youtube.com/watch?v=uGWQELrZn_o
DATS Multi Plane Balancing Tutorial (Part 3)
https://www.youtube.com/watch?v=W-Dcd3k2r2I
Sound Mapping Software Example
https://www.youtube.com/watch?v=KNZ3In5sisA
DATS Multi Plane Balancing Tutorial (Part 2)
https://www.youtube.com/watch?v=3iAfvjMWE6U
DATS Multi Plane Balancing Tutorial (Part 1)
https://www.youtube.com/watch?v=TtfKx6P0qNU
Sound, Vibration & Acoustics Digest #6
There's a distinct coffee "flavour" to our latest digest with two stories related to the bean. We hope you enjoy the articles we've found and as always please leave your…
What is Operating Deflection Shape (ODS) Analysis?
Operating Deflection Shape (ODS) analysis is a method used for visualisation of the vibration patterns of a machine or structure caused by unknown operating forces. This is different from the study of the…
Come & See Prosig At Automotive Testing Expo 2014 China
If you are visiting the Automotive Testing Expo 2014 China in Shanghai (September 15th - 17th) then please come along and see us at stand 9013. You will able to see all the…
What is waterfall frequency spacing? And how does the DATS parameter ‘Requested Frequency Spacing’ work?
Let us try to understand what waterfall frequency spacing is. Waterfall frequency spacing is the gap between spectral lines in an FFT plot.
For example, if you had an analysis frequency of 0Hz to 100Hz and 100 spectral lines, then Frequency Spacing is 1Hz.
So why is there a ‘Requested Frequency Spacing’ and an ‘Actual Frequency Spacing’? (more…)
What is “waterfall smearing”?
When analysing a waterfall or performing order analysis it is important to consider the frequency resolution or the frequency spacing.
There is often a desire to increase the resolution to finer and finer detail. But that is a process of diminishing returns, and actually fraught with danger. And that danger is waterfall smearing. (more…)
Prosig Join Condition Monitoring Group Limited
Prosig is pleased to announce that it has become part of Condition Monitoring Group (CMG) Limited. Prosig Limited will retain its operation in Fareham, Hampshire and will continue to operate with…
Multiplane Balancing – Zero Imbalance or Specified Imbalance
In the DATS Multiplane Balancing Software, there are two options, optimise for ‘Zero imbalance’ or optimise for ‘Specified imbalance’, but what is the objective of these two options?
(more…)
Sampling and Filtering Data for ISO8041 Compliance and Human Body Vibration Data Weighting
Various human body vibration measurements and assessments are defined in the ISO2631, ISO5349, ISO6954 standards and also in the EEC vibration directive 2002/44/EC. These assessments are based on the analysis…
Is it important to consider the cable resistance when using strain gauges?
The cable resistance can be a significant factor in the accuracy of the overall measurement. It is very important indeed to consider this point. Prosig software allows the cable resistance…
How should the bridge factor be selected when using strain gauges?
The number of active arms in a strain gauge Wheatstone bridge is known as the bridge factor.
As a simple guide when selecting bridge factors the following rules apply; (more…)
Sound, Vibration & Acoustics Digest #5
I hope you like our latest collection of news, articles and videos from the world of acoustics, vibration and analysis. After a very acoustics biased last edition we've dedicated this…
When should I use the ground connection on my P8000 data acquisition system?
The ground connection should be used if an issue has been observed in measured data, such as significant electricity supply (50Hz or 60Hz) distortion or significant noise. It must be attached…
Sound, Vibration & Acoustics Digest #4
I hope you like our latest collection of news, articles and videos from the world of acoustics, vibration and analysis. This issue of the digest is very "acoustical" and includes…
What engineering decisions are made by measuring a power spectrum?
By power spectrum we are talking about an ASD (Auto Spectral Density) or PSD (Power Spectral Density). In fact PSD is often used when really ASD would be more correct.
Taking any signal and performing a frequency analysis using an ASD or a PSD will give the energy over a range of frequencies. (more…)
What Is A Load Spectrum?
When engineers talk about the ‘Load Spectrum’ what do they mean?
There is no simple answer, simple terms like load and spectrum can be used in different situations and therefore to mean different things. However the most common definition of load spectrum is as follows… (more…)
How Do I Convert To Decibels?
Much confusion revolves around linear and non-linear numbers. The following outlines the mathematical process to convert from a number expressed in dB to a linear quantity. How do we convert to decibels and back again? (more…)
