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Difference between revisions of "NVGate Torsional"
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OROS propose a comprehensive suite for [https://en.wikipedia.org/wiki/Torsional_vibration torsional measurements] and analyses. It addresses most of the torsional, cyclic and rotational resonances issues. | OROS propose a comprehensive suite for [https://en.wikipedia.org/wiki/Torsional_vibration torsional measurements] and analyses. It addresses most of the torsional, cyclic and rotational resonances issues. | ||
For both R&D and diagnostics, the latest torsional feature the OROS analyzer <u>the solution</u> for '''transmissions, engines '''and''' electric machinery vibration analysis'''. | For both R&D and diagnostics, the latest torsional feature the OROS analyzer <u>the solution</u> for '''transmissions, engines '''and''' electric machinery vibration analysis'''. | ||
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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> | 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 == | |||
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· The torsional behavior 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 analyzed 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> | · The torsional behavior 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 analyzed 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> | ||
==Specifications== | |||
The FVC option features the following main specifications:<br> | |||
· Number of pulses/rev: 1 to 4096<br> | |||
· Max pulse frequency: 40 kHz 64 times oversampled, <br> | |||
· Max angular speed:<br> | |||
Max RPM = (40 000*64)/pulse per revolution exemple : 12 800 RPM with 200 Pls/rev<br> | |||
· Missing teeth management: up to 3 consecutive teeth.<br> | |||
· Available filters: HP, LP; BP, SB, Int, double Int, differentiation<br> | |||
==Torsional Analyses== | ==Torsional Analyses== | ||
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At least the filter which let you integrate or differentiate the RPM speed to get respectively plane angle deviations and angular accelerations for the analyses. | At least the filter which let you integrate or differentiate the RPM speed to get respectively plane angle deviations and angular accelerations for the analyses. | ||
===Fractional missing pulses management=== | |||
The missing pulses are a common situation faced while doing torsional measurement. In the case of a classical flywheel (60:2) it is easy to set and measure excluding this 2 missing pulses. But most of the measurement done on the industry do not offer the comfort of an encoder or gear teeth access. | |||
[[Image:Release_note_27.jpg|framed|none]] | |||
A very useful solution is the piano (or zebra) tape which is glued on the shaft and read by an optical probe: Easy to install and to use. | |||
But the main problem is to have an entire number of pulses. This is never achievable because the various parameters are difficult to control: Black/white period, diameter of the shaft, thickness of the tape/glue. Well, don<nowiki>'</nowiki>t try, this is not possible. | |||
The solution is to leave a hole which is interpreted as missing pulse. Due to the above variables it will be a fractional number of missing pulse. | |||
OROS torsional function is able to manage such fractional pulses. It offers to achieve torsional measurement on the field in a simple and easy way. | |||
[[Image:Release_note_28.png|framed|none]] | |||
<font color="#0070C0"><u>''''' Piano tape junction for fractional missing pulse management'''''</u></font> | |||
The empty area (missing teeth) length at the piano tape junction must be included between 1 and 3 teeth. The number of missing teeth must be set to the exact number of missing teeth: In this example: 2. | |||
Note: the total number of teeth includes the missing teeth. | |||
====On-line==== | ====On-line==== | ||
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· The conversion setup is available from the ASB. It is identical to the on-line one: | · The conversion setup is available from the ASB. It is identical to the on-line one: | ||
· At least the Tors. x signal (converted to angular velocity (or acceleration or deviation) is available from the track connection dialog: | · At least the Tors. x signal (converted to angular velocity (or acceleration or deviation) is available from the track connection dialog: | ||