tachometer Archive
Measuring Torsional Vibration 101
Posted on January 24, 2012 | No CommentsDo you need to measure torsional vibration? Interested in shaft twist? Worried about rotational jitter? Don’t worry, we’ve got it covered. Here we have gathered together our most popular articles...
What is Synchronous (Angular) Sampling?
Posted on November 9, 2011 | No CommentsThe term synchronous data is usually applied to vibration or acoustic data that is captured from an item of rotating equipment at regularly spaced angle intervals as distinct from regularly...
How To Analyze Noise & Vibration In Rotating Machines
Posted on August 9, 2011 | 3 CommentsIn this article we will look at the basic steps behind a simple rotating machinery study. We won’t look in great detail at some of the techniques involved – we deal with...
Do Missing Tacho Pulses Mean The End Of The Road For Your Test?
Posted on September 20, 2010 | No CommentsCreating a stable, good quality tacho signal can be one of the hardest parts of analyzing rotating machinery. So what happens if our carefully designed and implemented tacho misses a...
The Intelligent Way To Sort, Extract & Analyze Signals
Posted on May 10, 2010 | 1 CommentThis note is based on a real requirement presented to Prosig by a prospective user. It’s the sort of challenge that we relish. This case is a great example of...
Measurement And Analysis Of Torsional Vibration
Posted on October 17, 2008 | 13 CommentsTorsional vibration is of key importance in the area of vehicle development and refinement. The main contributory source is the engine where periodically occurring combustion cycles cause variation in the...
Measuring Torsional Crank Shaft Jitter
Posted on June 24, 2007 | No CommentsUsing Prosig’s P8000 series data acquisition system with DATS signal analysis software, torsional analysis (crank jitter) was performed on an automotive engine attached to an engine dynamometer. The significance of...Evaluating A Closed Loop Control System For High Pressure Pumps
Posted on March 29, 2007 | 1 CommentProsig were recently involved in the validation of a closed loop control system for an automotive pump supplier. The customer has a large number of test cells, each test cell...Torsional Vibration, Tacho Pulses And Aliasing
Posted on January 12, 2006 | 3 CommentsWith shafts, gears and the like, the general method of determining the rotational speed is to use some form of tachometer or shaft encoder. These give out a pulse at...
Analyzing Shaft Twist And Repairing Damaged Tachos
Posted on October 19, 2005 | 1 CommentA shaft has been instrumented with two shaft encoders, one at each end. Each shaft encoder gives out a once/rev pulse and a 720 pulses/rev signal. Each signal was digitised...A Simple Noise Test
Posted on August 26, 2005 | 2 CommentsIn a recent article we described how the Prosig P8000 hardware and DATS software had been used to help Dalmeny Racing diagnose a problem with an exhaust bracket on their...
Phase Between Signals
Posted on August 9, 2005 | 4 CommentsThe following article was written in response to a question from a visitor to the website. The gentleman in question had been reading some of the Prosig signal processing articles...
Audio Equalisation Filter & Parametric Filtering
Posted on May 17, 2005 | No CommentsWhen working with audio signals a common requirement is to be able to equalise, cut or boost various frequency bands. A large number of hardware devices on the market provide...
Measuring Torsional Twist & Vibration Along a Shaft or Through a Geartrain
Posted on May 15, 2002 | 3 CommentsThe measurement of the twist angle between two points along a shaft or through a gear train may be derived from a pair of tacho signals, one at each end...
High Pass Filtering And Tacho Signals
Posted on June 6, 2001 | 2 CommentsIt is sometimes necessary to pass a signal through a high pass filter to eliminate low frequency signals. These may arise for instance from whole body vibrations when perhaps our...
