Tagged With "analysis"

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You’re Making It Too Complicated

Reliability ·
We make problem solving more complicated than it needs to be
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Audit it. Improve it! Getting the most from your vibration monitoring program

Alan F ·
Hi everyone, My first book "Audit it. Improve it! Getting the most from your vibration monitoring program" was published a couple of weeks ago and I think it will be useful to many of you. The book fills in what I see as a major gap in training /...
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best way to cbm of low speed shaft

aziz58 ·
dear all i am looking practical approch and vibration analysis technique for low speed shafts. pls share your experience. best regard
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Breakthroughs in the Past Decade

Shurafa ·
Hello. If you are asked to think about the major developments in the field of vibration analysis introduced over the past 10 years, what would you list? What I’ve seen (and my exposure is limited) is more of a “system development” but not a lot of breakthroughs on the analysis itself. New products (hardware and software) are released such as laptop/tablet based solutions with more flexibility functions. Some are wireless and some use the cloud. More manufacturers and startups. But on the...
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Cross Channel Phase Analysis

Pump Guy ·
I recently identified root cause of high vibrations on a horizontal pump. Amplitudes at PIH & POH locations exceeded specification limit. I did cross channel phase analysis using CSI 2140. Phase angle difference on pump feet and pads (vertival direction) was 170 degree. This indicated they were moving out of phase. I loosened one hold down bolt and the 1X peak amplitude dropped from 0.40 in/s to 0.20 in/s. I used monitor mode of the device and loosened second bolt and the 0.2 in/s 1X...
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Cross Channell Phase Analysis with CSI 2140

NewVibeTech ·
Has anyone tried Cross Channel Phase Analysis with the Csi 2140? I tried with no success and I'm wondering is it a special cable needed to do this? Anyone with any experience using the 2140 for phase please let me know how this was done. Thanks in...
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Cross Phase analysis issue

Hossam 2 ·
Problem is in motor if atox mill (insaldo) The free end has a 4xts dominent vibration we have balanced it to reduce one x from 3 to 0.3 mm/s vut still over all value is 5.5mms wiz 4xts sharp  The phase relationship is weired as 180 phase difference between the drive end and non drive end in the vertical direction ..i suspect misalignment problem and the other issue is that no sensors give exact reading across the coupling specially in the gearbox side always give real value in the motor...
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Cyclo reducer vibration

tcvib ·
Everyone, Found this white paper on Cyclo reducer vibration analysis and thought it was good info for us.
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Drawing mechanical software for vibration analysis support

Alvaro Loayza ·
Hello everybody, I'm trying to make mechanical drawings for diagnostic in our equipment like multiple stage gearboxes, multiple stage screw compressors, etc. I would want to introduce information like bearing code and number of teeth. An idea of what I want to make is attached. I was going to make this on AutoCAD but is there any software with libraries to just introduce information? Thanks to everybody. Greetings.
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Good motor application guide by GE

Dan Timberlake ·
https://www.orbit-magazine.com/wp-content/uploads/2016/03/GEA32339-Elec-Motor-Cond-Monit-App-Guide_R3.pdf
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Kurtosis

Avinash Thawani ·
Is Kurtosis required for Vibration Analysis these days and how significant it is? Which are the main machine components where it can be used?
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Need suggestions on Opensource software for realtime vibration analysis

Kishore kumar ·
Dear members , please guide me , which are the best opensource software package to used to solve flow induced vibration analysis (CFD , FEA Analysis ) .And also for Design and simulation . i would like to used it to make changes in plant piping , duct and structures etc Or to analysis to solve the problems in existing design . I need your valuable suggestions . Thanking you in advance .
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Orbit analysis for electric motor

Alvaro Loayza ·
Hello to everybody, We're proposing to implement orbit analysis in our 3500 HP sleeve bearing electric motor. We collect data only with accelerometer and make standard FFT and waveform analysis. Do you have an aproximate cost or proposal for proximity probes to install and recommended software you could share with me? Greetings.
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OSA4 Microlab - anybody bought one and is it any good?

Hubbe01 ·
WE considering purchasing a Osa4 Microlab to enhance our oil analysis program. The Osa4 is designed for use in transportation industry. Do you think we coulduse this for our Oil Analysis program in Oil and Gas Industry. One short fall of the Lab is...
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Phase Analysis with SKF Micolog

ALI HAIDERR ·
Dear Experts, I was user of CSI and got cross phase data 0 -180 degree which can be applied for diagnostics. But now i am using SKF Microlog and getting cross phase data e.g.257 degree,330 degree etc.I believe cross phase data should not be greater than 180 degree.May I correct?and what I understand by SKF cross phase data which may be greater than 180 degree. How can I take results by this data? Thanks
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Root Cause Failure Analysis

Rana Yasir Ayub ·
One of our customer (cement plant) facing unplanned shutdown just 1 hr ago ID fan(Raw Mill) Dive End Bearing is damaged which was newly installed 10 days ago in plan shutdown. We need help in Root Cause Failure Analysis,,, All other Bearings of Fan as...
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Test Bed Motor and Blower

Avinash Thawani ·
I have motor and blower currently the noise is 100 db.I want to reduce the noise, can you please advise how to remove the noise. Please find picture attached.
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Vibration analysis on torque converter

Eng. Ahmed ·
Dears  Good evening  i am requested to prepare and analyze   vibration in a gas turbine torque converter (kind of fluid coupling), i did not analyse vibration in like equipment before , only i did in rigid coupling . can anyone helps if there are any difference and the spectra pattern for fluid inside the torque converter . Any comments may help me.   thanks in advance
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Vibration Analysis reporting software or any program or spread sheet.

vipul@cmc ·
Hi, I required good report entry and compliance tracking program for multiple internal customers . at present I am using excel sheet attached herewith What should be the best reporting formats in Excel. Regards, Vipul
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Vibration root cause analysis with spread sheets

Kishore kumar ·
Does any one have experience in using spread sheets for ODS analysis and any other engineering analysis ?And Using XL rotor ?Please share your experience and suggest valuable spread sheet applications?
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Why do we need criticality analysis as part of a reliability improvement effort?

Reliability ·
Many companies do not have an up to date or accurate criticality ranking for assets – but almost everyone responds that they know what is important. If everyone knows what is important why do we need criticality analysis?
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Water and Air Rotary Unions

UKvibes ·
I have tested Air/Water combined rotary unions in the past and found vibration useful to confirm a failing seal. But the limited data collected during healthy uptime hasn't been sufficient enough to say if it could be used predictively. Does anyone have any experience periodically testing a rotary union? Is it reliable? Are there any specific signals to look out for? Are there any reliable testing techniques other than vibration? ie. pressure testing?  
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what meaning of filtered orbit analysis

Ngo Dinh ·
Hi everybody, I think that most of people in this forums has ever used orbit plot for analysis and it seem not to deny that orbit plot is one of key information in diagnostic. But which orbit should be used for analysis is not simple at least for...
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ReliablePlant

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Root Cause Analysis Workshop

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Re: Water and Air Rotary Unions

Walt Strong ·
My first choice for detecting leaks and abnormal friction on rotary unions would be to use ultrasound instead of vibration measurements. Ultrasound Meters are available from SDT, UE Systems, and CTRL. Walt
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Re: best way to cbm of low speed shaft

mirook ·
use longterm waveform or HFD like Envelope demodulation,SPM,peakvue
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Re: Why do we need criticality analysis as part of a reliability improvement effort?

candy ·
To focus different strategies based on criticality. To identify the safety-critical elements. To manage risk = consequence x probability x detectability
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Re: Why do we need criticality analysis as part of a reliability improvement effort?

Reliability ·
Thanks Candy. Can we use criticality to determine condition monitoring coverage? Do you have any examples?
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Re: Need suggestions on Opensource software for realtime vibration analysis

Walt Strong ·
If you don't get any other replies, you can try this link: http://www.eng-tips.com/threadminder.cfm?pid=724 Walt
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Re: Need suggestions on Opensource software for realtime vibration analysis

Walt Strong ·
This link would be more appropriate to direct questions for FEA: Finite Element Analysis (FEA) engineering Forum Pasted from < http://www.eng-tips.com/threadminder.cfm?pid=727 > Walt
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Re: Test Bed Motor and Blower

Walt Strong ·
Add suction and discharge ducts to outside the room/building. If still too noisy, then add suction and discharge silencers. How quiet do you want it? Is the dB value an overall A-weighted level or something else? Where did you make the measurement? Do you know anything about acoustics and noise control? If not, then consider hiring an expert! I do noise control. Walt
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Re: Test Bed Motor and Blower

Avinash Thawani ·
Hi, This is placed in open space so no use putting a duct. Kindly advise what other changes i can do.
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Re: Test Bed Motor and Blower

Walt Strong ·
Why are you operating fan without ducts? Certainly cannot do fan performance tests, so perhaps you are making a short run for vibration test or balancing? What is duration of operation? Can you put fan in a noise controlled enclosure or build one around it? Sound level can be reduced by reducing speed, but pressure and flow are also reduced. There are some methods of "quiet fan design", but you would need an R&D project to develop it. You can always use personal hearing protection or...
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Re: Test Bed Motor and Blower

Avinash Thawani ·
I plan to reduce the speed of the motor so the fan speed is reduced.
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Re: Test Bed Motor and Blower

Dan Timberlake ·
I too am curious what testing can be done with no duct work, except maybe running- in before shipment. In which case ear protection is the way I'd go (and eye protection for the dirt and dust being flung around). Some designs need ducting to prevent drawing excessive power in "free air" condition. At least it is anchored down when running. Are there only 4 anchor bolts, and none under the motor section? It is hard to see in the video. Are vibration measurements part of the testing? I...
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Re: Test Bed Motor and Blower

Avinash Thawani ·
Hi, I am going to be doing vibration analysis on the following machine which is the motor and the blower. There is bolting properly done. Please find attached spectrum's of the motor and blower. Kindly advise what to do next.
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Re: Test Bed Motor and Blower

Avinash Thawani ·
How to improve alignment
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Re: Test Bed Motor and Blower

Walt Strong ·
Why are you asking about alignment? You have a machine with 4-bearings, so where were the vibrations measured and in what directions; horizontal, vertical and axial? (forget about X,Y, Z unless you specify the correct orientation!) What is the shaft speed? What are the frequency and amplitude values of the dominant frequencies? What instrument and software did you use for these plots? Walt
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Re: Test Bed Motor and Blower

Walt Strong ·
Your first photograph showed the blower sitting on a floor or ground. I would suggest bolting it rigidly to a foundation base or setting the base on rubber pads or mounts. At the very least, this would minimize vibrations caused by loose structural connections, and perhaps it would keep the vibrations repeatable from one run to the next. You have asked for help, but you have provided very little information to work with. A poorly labeled vibration spectrum is difficult to work with; like it...
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Re: Test Bed Motor and Blower

fburgos ·
Add a silencer. do you align before or after bolting, it might need realignment, also your spectrum right now its useless without information, where does the data come from, type and number of bearings, machine speed, line frequency, number of vanes?
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Re: Cross Channel Phase Analysis

Lou Pag ·
I am glad that the problem was solved. I am assuming that since your excessive amplitudes were at POH and PIH these are the locations where the 1X amplitudes dropped off when the bolts were backed off. I say this because you did not specify. The 170-degree phase difference was in the verticals as stated but not in the horizontals. The induced stress due to the soft foot does not allow much amplitude at 1X at POV and PIV but why the 170-degrees difference between POV and PIV? Here is why. You...
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Re: Cross Channel Phase Analysis

Pump Guy ·
Lou Pag, Thanks for your valuable comments!
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Re: Cross Channel Phase Analysis

Lou Pag ·
You are welcome.
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Re: Test Bed Motor and Blower

Avinash Thawani ·
Hello, I have changed the speed of the motor to 960 RPM. This is a 2 HP, 3 Phase Motor. The noise level has gone down so that is not a problem now. I am get a 3X peak in all bearings as shown below. Kindly advise what to do next.
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Re: Cross Channel Phase Analysis

seandude ·
Foot related resonance is very common. I have found that I can lower vibration significantly on just about any machine in my plant by loosening a hold down bolt. This is especially true for vertical pumps. I set my analyzer (CSI 2130) to monitor mode and watch the 1x frequency as I randomly loosen then tighten each hold down bolt on both the drive and driven equipment while it's running. Sometimes shimming the affected foot does not correct the high vibration. In fact, it transfers the...
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Re: Test Bed Motor and Blower

Walt Strong ·
The highest vibration level is at the motor drive end bearing in the axial direction. It is also high in the other directions. If you say that the peak vibration is at 3X shaft speed, then I would suspect you have a loose bearing or a very worn bearing. It's very difficult to expect anyone to view a vibration spectrum with a frequency range of 3000 Hz and pick off details. It would be more informative if you had a spectrum with a much lower F Max and with cursor marking the high vibration...
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Re: Cross Channel Phase Analysis

Lou Pag ·
I have found that to be true also. If it is soft foot, I see the advantage of machining the base flat to remove it but no effect, if any, if it it is foot-related resonance. Stiffening to alter the natural frequency may be the most plausible correction . Sometimes even changing the RPM by 10% or so can make a positive difference. Or leave the one bolt loose, as you say, if it won't compromise ssfety is a possible solution.
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