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Difference between revisions of "NVGate Torsional"
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On reciprocating machinery (diesel engine, pump) or any acyclic rotating devices (generator,compressor), the cause of vibrations often comes from the non-linearity of the angular speed. The analysis of the instantaneous angular speed inside each shaft revolution provides essentialinformation. Such information are helpful for vibrations reduction during prototyping or evenfor source identification while doing service diagnostics.<br> | On reciprocating machinery (diesel engine, pump) or any acyclic rotating devices (generator,compressor), the cause of vibrations often comes from the non-linearity of the angular speed. The analysis of the instantaneous angular speed inside each shaft revolution provides essentialinformation. Such information are helpful for vibrations reduction during prototyping or evenfor source identification while doing service diagnostics.<br> | ||
The common way to measure such instantaneous velocity is to install a coding wheel or a rotary encoder on the shaft. Then the rate of pulse delivered by such device is directly proportional to the RPM speed during the last pulse interval. This type of measurement needs a specific conditioner(usually an external box) which transforms the pulses train in a continuous voltage proportional to the RPM. | The common way to measure such instantaneous velocity is to install a coding wheel or a rotary encoder on the shaft. Then the rate of pulse delivered by such device is directly proportional to the RPM speed during the last pulse interval. This type of measurement needs a specific conditioner(usually an external box) which transforms the pulses train in a continuous voltage proportional to the RPM. Such devices are expensive, lead to more cable, are oftenlimited to 2 probes and so on. But the main inconvenience is the phase error they introducedue to their internal response time.<br> | ||
'''OROS propose an integrated frequency to RPM converter which avoids the above-mentioned inconveniences.''' | |||
Such devices are expensive, lead to more cable, are oftenlimited to 2 probes and so on. But the main inconvenience is the phase error they introducedue to their internal response time.<br> | |||
== Frequency to RPM converter (Torsional inputs) overview == | == Frequency to RPM converter (Torsional inputs) overview == | ||
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This option transforms each external Synch input in afrequency to RPM converter (allows handling up to 6 torsional/acyclic inputs at a time). This integrated converter benefits of the high accuracy of the 3-Series analyzers Ext. synch inputs (over sampled up to 6.4 MHz). As a matter of fact the sampling of such pulse rate must bevery accurate in order to avoid speed jitter on the result. | This option transforms each external Synch input in afrequency to RPM converter (allows handling up to 6 torsional/acyclic inputs at a time). This integrated converter benefits of the high accuracy of the 3-Series analyzers Ext. synch inputs (over sampled up to 6.4 MHz). As a matter of fact the sampling of such pulse rate must bevery accurate in order to avoid speed jitter on the result. | ||