Prosig Noise & Vibration Measurement Blog » engine

Calculating Velocity Or Displacement From Acceleration Time Histories

Adrian Lincoln — Fri, 05 Oct 2007 10:56:53 +0000

It is quite straightforward to apply “classical” integration techniques to calculate either a velocity time history from an acceleration time history or the corresponding displacement time history from a velocity time history.

The standard method is to calculate the area under the curve of the appropriate trace. If the curve follows a known deterministic function then a [...]

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 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 [...]