Crankshaft Vibration tools - M1 Expert 03

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Crankshaft Vibration tools

Crank Vibration
Our Crank Synchronous Acquisition (CSA) device not only provides cylinder pressure analysis but can also be used for complex vibration monitoring, without the need for cylinder pressure sensors.

With just the normal crankshaft and camshaft sensors it is possible to analyse crankshaft torsional vibration with respect to the natural resonances of a compression/expansion combustion engine.
These vibrations, and their minimisation, are the key reason many OE vehicles are fitted with Torsional Vibration Dampers (TVD), or harmonic balancers as standard.
The CSA tool measures every tooth interval in the 720 degree four-stroke cycle and derives crankshaft acceleration and deceleration from this data, with respect to the average engine speed.
Along with a real time display of these resonances, Fourier Analysis of the signal provides the orders of vibration (or multiples of the basic engine cyclical resonance) in real time.
From this data it is possible to analyse and improve torsional dampers for a given engine installation. A complete dyno pull can reveal the orders of torsional vibration at all engine speeds and their magnitude.

Crank Twist
If a second 60 tooth sensor wheel is installed at the other end of the crankshaft the CSA device can measure crankshaft angular twist as well as vibration. Normal tools cannot derive this data as the twist varies continuously as the engine rotates. The CSA device can do so because all tooth intervals are passed to the PC application and logged for later analysis.
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