sun ics vibration analysis

7/28/2019 Sun Ics Vibration Analysis

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New Methods In Vibration Analysisaccelerometer data and sunics

presented by

Jason Tranter, Mobius Institute

compiled by

Diego Tognola, Sunics

VANZ 2006

Jason Tranter (Diego Tognola) New Methods In Vibration Analysis VANZ 2006 1 / 31
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Sunics in General

Part I

Sunics in General

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Sunics in General Introducing Sunics

What is a sunic ? a new way of looking at time series / signals rearranges but preserves time waveform data

visualizes data via a coloured bitmap produces representation as compact as spectrum

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S i i G l I d i S i


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S i i G l I t d i S i


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What is a sunic ? a new way of looking at time series / signals rearranges but preserves time waveform data visualizes data via a coloured bitmap produces representation as compact as spectrum




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How does it work ?

time waveform issplit into cycles

cycles are stretched toequal length wave shapes

wave shapes are arrangedto waterfall diagram

waterfall is connectedand colour coded

viewed from abovethis yields the sunic

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How does it work ?







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How does it work ?







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g

How does it work ?






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g

What does it show ? in phase direction: wave shape per cycle in time direction: evolution of wave shape, amplitude envelope colour values: amplitude, e.g. acceleration or velocity combined: location of phenomena in time and phase




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So lets look at some examples...


Sunics in General First Examples
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Sine Wave

Each image column of the sunichas the same colouring.


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Sine Wave


The colouring corresponds to asinusoidal wave shape.



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Sine Wave


The colouring corresponds to asinusoidal wave shape.

This wave shape is constant forall times.

The next example features adifferent wave shape...


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Sine Wave Two Synchronous Components I


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Two Synchronous Components I

zero phase difference

Again, the wave shapeis constant over time.




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The signal has two frequency

components withzero phase difference.




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The signal has two frequency

components withzero phase difference.

What happens if thephase difference is not zero ?




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Two Synchronous Components II

nonzero phase difference




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Time waveform and sunic show a difference.




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The spectrum shows no difference.


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Two Asynchronous Components Another example:


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Two asynchronous componentscause the wave shape tochange repeatedly with time.


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This produces a repeatingdiagonal pattern in the sunic.


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But it is more difcult to see in thetime waveform


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But it is more difcult to see in thetime waveform

and impossible to see in thespectrum.


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So what can sunics reveal in vibration analysis ?


Sunics in Vibration Analysis
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Part II

Sunics in Vibration Analysis


Sunics in Vibration Analysis Applications
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Applications in Vibration Analysis ? recognition of phaserelated changes (e.g. rotating machinery) efcient time waveform analysis (no zooming or scrolling required) detection of slow changes (low frequency components) localization of faults in time and phase


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Lets go back to examples...


Sunics in Vibration Analysis Beating, Amplitude and Phase Modulation
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Beating

(2Hz beating frequency)

The sunic features:


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Beating


The sunic features:

variation in colour rangeshowing amplitude envelope


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Beating


The sunic features:


diagonal pattern implying

asynchronous components


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Beating


The sunic features:



asynchronous components

two repetitions correspondingto 2Hz beating frequency.


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Beating


The sunic features:



asynchronous components two repetitions corresponding

to 2Hz beating frequency.

Compare this to the followingamplitude modulation:



Beating Amplitude Modulation
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The time waveform shows little difference.



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The spectrum shows little difference.



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The sunic clearly shows a difference.


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Amplitude Modulation

In general, sunics showdifferences in a very distinctmanner.


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Amplitude Modulation

In general, sunics showdifferences in a very distinctmanner.

This is not always the case forspectra:



Amplitude Modulation Phase Modulation
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p

Note the similar spectra here...



Phase Modulation Amplitude and Phase Modulation
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p

..and here.


Sunics in Vibration Analysis Impacts
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ImpactsMuch like the time waveform,sunics allow to determine the

timing and location of impacts


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ImpactsMuch like the time waveform,sunics allow to determine the

timing and location of impacts

but more easily.



Impacts at Constant Phase Impacts at Constant Phase
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p

(simulated)

p

(real bearing)



Impacts at Constant Phase Impacts at Constant Phase
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p

(simulated)

p

(real bearing)

Impacts at 130 of each cycle


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Impacts at Changing PhaseFor impacts at changing phase

location, the sunic allows to locatethe impact in time and phase.


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This is more difcult withthe time waveform


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and impossible with the spectrum.


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and impossible with the spectrum.

Spectra do not produce such

distinct patterns for impacts:



Impact at Changing Phase Temporary Flattening
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Flattening, for instance, may produce a similar spectrum.

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Sunics in Vibration Analysis Transients


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TransientsTransients produce similar patterns like impacts,but ipped diagonally in the timephase domain.

Lets see two examples:



I l l O i T i R i Sh T i
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Irregularly Occuring Transients Repeating Short Transients



Repeating Short Transients
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Repeating Short Transients This second signal featuresrepeating, short transientsoccuring only during a part ofsome cycles.



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Their phase location varies overtime.



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This is difcult to see in the timewaveform



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This is difcult to see in the timewaveform

and impossible to see in thespectrum.


Sunics in Vibration Analysis Transient Vibrations

Transient Vibrations Time waveform and sunic both
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Transient Vibrationsallow separation of transient

vibrations into: fast changes dening the

vibration

slow changes dening thetransient envelope.



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Transient Vibrationsallow separation of transientvibrations into:

fast changes dening thevibration




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These aspects can not beseperated in the spectrum.





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allow separation of transientvibrations into:



These aspects can not beseperated in the spectrum.

This is seen if the envelope isomitted:



Transient Vibrations Constant Vibration


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Transient Vibrations Constant Vibration

Jason Tranter (Diego Tognola) New Methods In Vibration Analysis VANZ 2006 27 / 31 Sunics in Vibration Analysis Misalignment


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MisalignmentWe conclude our examples withtwo signals showingslow variations in misalignment.


Slowly Pulsating Misalignment Changing Misalignment Location
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Left: the typical M shape appears and disappears twice.


Slowly Pulsating Misalignment Changing Misalignment Location
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Right: the M shape persists but changes its phase location.

Jason Tranter (Diego Tognola) New Methods In Vibration Analysis VANZ 2006 29 / 31 Conclusion Summary


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What have we seen ? sunics produce very detailed

and distinctive patterns they show fast and slow

changes in two decoupled

directions (phase and time) time waveform information is

presented all at a glance sunics reveal information not

accessible via the spectrum.



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changes in two decoupled

directions (phase and time) time waveform information is

presented all at a glance sunics reveal information not

accessible via the spectrum.

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changes in two decoupleddirections (phase and time)

time waveform information ispresented all at a glance

sunics reveal information notaccessible via the spectrum.

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changes in two decoupleddirections (phase and time)

time waveform information ispresented all at a glance

sunics reveal information notaccessible via the spectrum.

Jason Tranter (Diego Tognola) New Methods In Vibration Analysis VANZ 2006 30 / 31 Conclusion Thank you
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Thank you very much for your attention.

More information can be found on www.sunics.com

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sun ics vibration analysis

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