Prosig Noise & Vibration Measurement Blog » tachometer

The Intelligent Way To Sort, Extract & Analyze Signals

Adrian Lincoln — Mon, 10 May 2010 08:28:24 +0000

This 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 a real-world signal processing requirement and also great test of some of the unique features of Prosig’s DATS software. It also shows the power and flexibility [...]

Measurement And Analysis Of Torsional Vibration

Adrian Lincoln — Fri, 17 Oct 2008 07:44:13 +0000

Torsional 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 crankshaft rotary vibration. This vibration is transmitted to and modified further by other components in the powertrain such as the gearbox and by other equipment driven [...]

Measuring Torsional Crank Shaft Jitter

Chris Mason — Sun, 24 Jun 2007 07:43:54 +0000

Using 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 this is that only one tachometer channel was required to identify crank jitter.

Figure 1: A Prosig P8020

The Prosig P8020 data acquisition unit (see figure [...]

Evaluating A Closed Loop Control System For High Pressure Pumps

James Wren — Thu, 29 Mar 2007 11:57:54 +0000

Prosig 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 has 8 pumps continually on test. Each pump is instrumented with a revolution or tachometer sensor, giving a once per revolution tachometer pulse. Additionally, there [...]

Torsional Vibration, Tacho Pulses And Aliasing

Dr Colin Mercer — Thu, 12 Jan 2006 15:44:34 +0000

With 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 [...]

Analyzing Shaft Twist And Repairing Damaged Tachos

Dr Colin Mercer — Wed, 19 Oct 2005 09:22:40 +0000

A 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 at 500,000 samples/second. The objective is to measure the twist in the shaft and analyze into orders. The test stand was already equipped with a data [...]

A Simple Noise Test

James Wren — Fri, 26 Aug 2005 19:53:35 +0000

In 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 [...]

Phase Between Signals

Dr Colin Mercer — Tue, 09 Aug 2005 17:08:39 +0000

The 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 [...]

Audio Equalisation Filter & Parametric Filtering

Dr Colin Mercer — Tue, 17 May 2005 14:14:20 +0000

When working with audio signals a common requirement is to be able to equalise, cut or boost various frequency bands. [...]

Torsional Vibration Example

Dr Colin Mercer — Wed, 15 May 2002 10:10:09 +0000

The 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 of the shaft. Typically the tacho signals would be derived from gear teeth giving a known number [...]

High Pass Filtering And Tacho Signals

Dr Colin Mercer — Wed, 06 Jun 2001 17:13:29 +0000

It 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 interest is in higher frequency components from a substructure such as an engine or gearbox mounting. The vibration levels are speed sensitive and the [...]