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Difference between revisions of "NVGate Torsional"
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For both R&D and diagnostics, the latest OROS analyzer feature <u>solutions</u> for '''transmissions, engines '''and''' electric machinery vibration analysis'''. | For both R&D and diagnostics, the latest OROS analyzer feature <u>solutions</u> for '''transmissions, engines '''and''' electric machinery vibration analysis'''. | ||
On reciprocating machinery (diesel engine, pump) or any acyclic rotating devices (generator,compressor), the cause of vibrations often comes from the non-homogeneity of the angular speed. The analysis of the instantaneous angular speed inside each shaft revolution provides essential information. Such information are helpful for vibrations reduction during prototyping or | On reciprocating machinery (diesel engine, pump) or any acyclic rotating devices (generator,compressor), the cause of vibrations often comes from the non-homogeneity of the angular speed. The analysis of the instantaneous angular speed inside each shaft revolution provides essential information. Such information are helpful for vibrations reduction during prototyping or even for 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. Such devices are expensive, lead to more cable, are | 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 often limited to 2 probes and so on. But the main inconvenience is the phase error they introduce due to their internal response time.<br> | ||
'''OROS propose an integrated frequency to RPM converter''' which avoids the above-mentioned inconveniences. | '''OROS propose an integrated frequency to RPM converter''' which avoids the above-mentioned inconveniences. | ||
== Frequency to RPM converter (Torsional inputs) == | == Frequency to RPM converter (Torsional inputs) == | ||
This option transforms each external Synch input in | This option transforms each external Synch input in a frequency 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 analysers Ext. synch inputs (over sampled up to 6.4 MHz). As a matter of fact the sampling of such pulse rate must be very accurate in order to avoid speed jitter on the result. | ||
<br> | <br> | ||
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· Max angular speed:<br> | · Max angular speed:<br> | ||
Max RPM = (40 000*64)/pulse per revolution | Max RPM = (40 000*64)/pulse per revolution example : 12 800 RPM with 200 Pls/rev<br> | ||
· Missing teeth management: up to 3 consecutive teeth.<br> | · Missing teeth management: up to 3 consecutive teeth.<br> | ||
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[[File:tosion2.png|framed|none]] | [[File:tosion2.png|framed|none]] | ||
* A new input is create, this is the signal of the | * A new input is create, this is the signal of the tachometer velocity. It can be put to analyze in any NVGate plug in. | ||
[[File:tosion3.png|framed|none]]<br> | [[File:tosion3.png|framed|none]]<br> | ||
*The non cyclic | *The non cyclic behaviour of a shaft can be analysed by the order analysis processing providing order profiles, the time domain analysis for in revolution RPM profiles, the Shaft view to visualize the evolution of speed during one revolution.<br> | ||
*The torsional | *The torsional behaviour of a shaft ([https://en.wikipedia.org/wiki/Torsional_vibration#Crankshaft_torsional_vibration crankshaft], alternator) or a driving belt (service belt) being excited by its acyclic motion. In such a case the phenomena are analysed order by order using the cross-phase tracking capabilities of the SOA Plug-in. In this case 2 or more torsional inputs are used: in different location of the shaft or on each pulley driven by the belt.<br> | ||
====Post-processing==== | ====Post-processing==== | ||
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*if the pulses have been recorded and not the converted signal, a new resource module called Signal Operation is then available for this conversion.<br> | *if the pulses have been recorded and not the converted signal, a new resource module called Signal Operation is then available for this conversion.<br> | ||
*Do a post | *Do a post analysis on the signal. | ||
*Click on connect track. Connect "Ext synch" track in "signal op" by a "drag and drop" and press ok. | *Click on connect track. Connect "Ext synch" track in "signal op" by a "drag and drop" and press ok. | ||
[[File:PA_tors.png]] | [[File:PA_tors.png]] | ||
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The twist measurement consists of computing the angle between the 2 side of transmission shaft (or belt/chain). The measured angle is directly proportional to the stress and the applied [https://en.wikipedia.org/wiki/Torque torque]. One common application is to choose an | The twist measurement consists of computing the angle between the 2 side of transmission shaft (or belt/chain). The measured angle is directly proportional to the stress and the applied [https://en.wikipedia.org/wiki/Torque torque]. One common application is to choose an appropriate [https://en.wikipedia.org/wiki/Harmonic_damper torsional damper]. | ||
The twist can be: | The twist can be: | ||
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|} | |} | ||
NVGate allows achieving angular sampled analysis avoiding the | NVGate allows achieving angular sampled analysis avoiding the artefacts introduced by the direct angular sampling. | ||