Author Archive
15 Jun 2012
Wide Band Integrators – What Are They?
For some time now it has been conventional ‘wisdom’
7 Feb 2012
Why is the microphone pressure reference 2*10-5 Pascals?
This seemingly simple question is actually quite fundamental. To
5 Sep 2011
Vibration : Measure Acceleration, Velocity or Displacement?
When using vibration data, especially in conjunction with modelling
20 Sep 2010
Do Missing Tacho Pulses Mean The End Of The Road For Your Test?
Creating a stable, good quality tacho signal can be
22 Jul 2010
Removing A-Weighting From Time History Signals
It sometimes occurs that signals are captured with A-weighting
29 Jun 2010
Aliasing, Orders and Wagon Wheels
These days most people collecting engineering and scientific data
22 Jun 2009
Interpolation Versus Resampling To Increase The Sample Rate
These are two different techniques aimed at different objectives.
4 Mar 2008
Vibration Monitoring Phase Measurement And The Tacho Signal
Any vibration signal may be analyzed into amplitude and
30 Nov 2007
Human Exposure To Vibration In Buildings (DIN 4150-2:1999-06 & DIN 45669-1:1995-06)
Standards DIN 4150-2:1999-06 and DIN 45669-1:1995-06 provide a means
23 Oct 2007
Orders v Time – Comparing Overall Levels
By combining a speed signal with a data signal
12 Sep 2007
Sound Steering
The requirement was to develop a ‘standard’ test for
25 Feb 2007
Order Cuts And Overall Level
Order cuts are taken from a set of FFTs,
7 Dec 2006
Acceleration, Velocity & Displacement Spectra – Omega Arithmetic
Accelerometers are robust, simple to use and readily available
9 Nov 2006
Examples Of Event Extraction And Removal
In many cases only significant events, such as bumps
12 Jan 2006
Torsional Vibration, Tacho Pulses And Aliasing
With shafts, gears and the like, the general method
19 Oct 2005
Analyzing Shaft Twist And Repairing Damaged Tachos
A shaft has been instrumented with two shaft encoders,
9 Aug 2005
Phase Between Signals
The following article was written in response to a
14 Jun 2005
Average Waterfalls Or Average Orders?
One would expect that averaging waterfalls and then extracting
17 May 2005
Audio Equalisation Filter & Parametric Filtering
When working with audio signals a common requirement is
22 Sep 2003
Cleaning Up Data
When we have a very noisy signal with a
29 Jul 2003
Notes On Fourier Analysis
Fourier analysis takes a signal and represents it either