Tagged With "convert"

Topic

AMS Machinery Health Software v5.7 how to use old databases

Raul-Miguel ·
I have a database of a client with have installed MHM v.5.61 and I have MHM v.5.7. I need to make changes in the database and introduce new machines but when I import it with my software noticed that database will be convert into v.5.7. It's possible to make changes in this database and give it back to my client without problem or my cliente won't be able to use databse because of the conversion. Could I save database in and old software version? Or It is possible to convert databases from...
Topic

Downtime to productivity convertion

Harley Dan ·
Hello All.   Any comment about how to convert downtime reduction in productivity cost increase?    
Topic

Best units for display of orbit plots?

Ralph Stewart ·
This may be a simple question I heard today, but it was asked and I would just like to hear from you guys and your ideas. Which are considered to be the best unit of measurement for orbit plotting? When using an accelerometer: would it be: use stored raw units of acceleration for orbit? Or converted raw units to Displacement during collecting data and then stored? Or converted to displacement from a stored raw acceleration units? Or convert the stored raw units to velocity? Or convert to...
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Converting Velocity Signal from Velocity Vibration Transducer

DuPlesis ·
Guys, I would like to have inputs from the fellows who have worked with SKF Microlog Analyzer. I have a Permanent installation, stud mounted Velocity Transducer (Make: CEC Model:4-131) installed on Accessory Drive Gear box of Solar Titan 130 Gas Turbine. I want to get Acceleration Data from the BNC Connector of this Velocity Sensor. However, in the setup for Micro log Analyzer when I select Vibration sensor type as velocity sensor the measurement units I get are only for Velocity or...
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Re: Best units for display of orbit plots?

John from PA ·
Was the question purposely intended to be limiting to casing measurements?
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Re: Best units for display of orbit plots?

Ralph Stewart ·
Yes they were John. Sorry about that.
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Re: Best units for display of orbit plots?

mirook ·
i think the first two will have same result, either can be used.
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Re: Best units for display of orbit plots?

Shurafa ·
Orbit is basically two waveforms combined. My first choice is to go with what makes the best analysis with the waveform. If, for example I'm concerned with a structural problem (usually a relatively low frequency range), I would use the displacement to analyze the waveform. So would I do for the orbit. Another point to consider is that physical interpretation for a displacement orbit is much more intuitive compared to velocity or acceleration, for most analysts (for sure including myself).
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Re: Best units for display of orbit plots?

John from PA ·
Ali M. Al-Shurafa sums it up nicely but I would like to add that caution should be used in the interpretation of data that involves signal integration. In my experience usually a single stage of integration, say velocity to displacement, can readily be accomplished. But when two stages of integration are needed, i. e., acceleration to displacement, problems can occur.
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Re: Best units for display of orbit plots?

dominich.vo ·
Hi Ralph , I had had a same question with you, but until now can not find the answer. Could I discuss together on this topic ? I see in some general guidelines about vibration monitoring for machine, Choosing unit to monitor depends on speed of machine such as: - with machine below 600 RPM : displacement is more preferable - with machine over 600 RPM : velocity and acceleration However, in the reality, with sleeve bearing in generator (rotating speed = 3000 RPM) , the raw unit is...
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Re: Best units for display of orbit plots?

Steve Ciesla ·
Ralph, I kinda hate answering a question with a question, but what do you (or whomever asked you the question) intend to do with casing orbit plots? Are you trying to infer the rotor movement from the casing measurements? If so, what you see from the casing may or may not reflect what is going on with the rotor. There's been plenty of discussions about shaft relative, seismic, and absolute measurements (including shaft sticks) on the board over the years. Many times we read about the seismic...
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Re: Best units for display of orbit plots?

Ralph Stewart ·
Thanks for the replies. I thought I replied back saying this is question is concerning a large shaker screen, but I do not see it posted. Maybe I never didn't "post it". I know I typed it up though. I am inclined to think that the "casing" readings (only thing able to get since the design is as it is) on the machine would be better if displayed in displacement to give the actual "path" the screen is moving. Seems like acceleration would be nothing but a jumbled up mess unless taken with tach...
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Re: Best units for display of orbit plots?

Walt Strong ·
Hi Ralph, I found this type of measurement to be very challenging on a large shaker-type conveyor. I did integrate the accelerometer output to displacement, but as I recall, there were signal overload issues to contend with. The displacement orbit can be a useful indicator of shaker performance and mechanical condition such as looseness and structural failure. I suggest making some measurements directly in acceleration and calculating the displacement level to compare to your measured...
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Re: Best units for display of orbit plots?

Shurafa ·
Based on my limited experience, there exist some systems allowing integration. Fewer allow differentiation. The online permanently mounted systems have less flexibility in changing measures. I always thought that the function should be available for advanced users as there could be cases with special analysis. With respect to the shaft relative measurement, I think the default should be displacement. This recommendation is based the physics of the clearance (shaft to bearing) and shaft...
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Re: Converting Velocity Signal from Velocity Vibration Transducer

John from PA ·
A previous discussion exists on this forum...see https://www.maintenance.org/to...elocity-acceleration . Suffice it to say that what you want to do is not a recommended practice and hence the reason the option is not offered.
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Re: Converting Velocity Signal from Velocity Vibration Transducer

Walt Strong ·
The velocity sensor only has a F-max of 2000-Hz, so why try to convert to acceleration? I don't know about the SKF software, but CSI allows acceleration display (signal differentiation) in the spectrum view (not waveform). It does not allow sensor definition Velocity->Acceleration for the analyzer, but perhaps the new analyzers and software do. Walt
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Re: Converting Velocity Signal from Velocity Vibration Transducer

Boilermaker ·
With the SKF analyzer and software the vibration data, the time waveform and spectrum units will be in units of the transducer, in your case velocity. However, in the software you can convert the spectral data into displacement and acceleration. Just right click in the spectrum plot and select the unit you want. Right click and select "Reset settings" to bring back to the original unit. The time waveform data is not convertible. In your case it will be in velocity units.
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Re: AMS Machinery Health Software v5.7 how to use old databases

Husker Tim ·
According to my CSI training MHM is only backwards compatible (you can move up a version but cannot move down a version). Once converted to 5.7 no going back!
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