Crank angle domain analysis (CADA) with speed estimation
Main sequence with grid-based acquisition and embedded analysis.
Testing combustion engines from a laser Doppler vibrometer signal (LDV) alone, without a separate speed encoder: the vibration signal — recorded on the surface of one cylinder of a 12-cylinder large engine — is acquired through a measure grid and analysed directly during the measurement. The evaluation displays the cycles in the crank angle domain from −360° to +360°: rectification, signal shift and peak detection lead to the detection of the engine cycle, from which cycle events (for example the closing of intake and exhaust valves) and the speed can be derived. A screencast is available.
Workflows in detail
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Engine Cycle Testing
Main sequence with grid-based acquisition and embedded analysis.
Start → signal trigger LDV → measure grid LDV (with "Crank Angle Analysis") → store → end; error flow present.
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Crank Angle Analysis
Characteristic block for cycle detection and speed estimation.
Characteristic start → rectifier → signal shift → peak detection → engine cycle detection → characteristic end.
Inside the software
Watch screencast
Take it with you
Import through the SonicTC DbManager — individually or merged into an existing database.
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