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Tagged With "Frequency"

Topic

Change in UvDB when Settings in Frequency converter are changed.

Gisli A. Gudm ·
Hi. I am looking for answers or hints why there is such change in Uv when swithching frequency is changed. I was using SDT270 ( Ultrasound ) Please review the spectrum and waveform soundfile Look forward to hear some brainstorming. All best Gisli
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Frequency for cardan shaft failures?

Alvin MC ·
Anybody here familiar with defect frequencies for cardan/Universal joint? Thanks
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Possible resonant frequency problem on direct couple overhung fan

Dustin Faust ·
I am dealing with a medium sized direct coupled overhung fan unit. 85KW motor. The unit is roughly 7 years old (PDM program is new here, I have 6 years experience). Unit was checked for the first time on 3/30/2017 with an overall amplitude of 0.08 in/sec (0-peak) at 1200 RPM on the Motor non drive end horizontal. Unit checked again on 5/12/2017 had an amplitude of 1.14 in/sec (0-peak) at 1500 RPM on the motor non drive end horizontal. Velocity spectrum showed a very high 1X RPM peak. A...
Topic

Are the vibration values correct?

jorgeluis-2000 ·
An axis that rotates at 10 RPM (0.16 Hertz) has been monitored with the SKF CMSS 2200 sensor; when looking at the Typical Frequency Response chart it is observed that 0.16 Hertz falls outside the minimum range (0.70 Hertz) of the curve, so my query is: is this transducer not valid for the velocity mode ?, if so, then the values of vibration obtained with this transducer are not correct ?.
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Same Ball Spin Frequency of Rolling Element Bearing and Line Frequency

Jigme Wangchuk ·
125 kW Motor used for driving Vertical Pump (multistage) have a bearing (Rolling Element Bearing) that has its Ball Spin Frequency same at that of Line Frequency of 50 Hz. Is this a serious problem ???
Topic

Bearing Defect Frequencies and Running Speed

Nitheesh ·
Hello, Most vibration analysis software have bearing defect frequency markers build into them, where you select the bearing and the fault frequencies are automatically matched. I also see that many software have these defect frequencies in Hz and Not Orders. (Eg: SKF NU 216 Bearing have 2.75 Hz as FTF, 22.9 Hz as FTF Also). And it appears to be a constant. So is bearing defects not related to running speeds? (Eg. NU 216 Bearing can be running at different speeds in different machines).
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Bearing VIbration Frequency Database

smartini ·
The Bearing Expert remains the largest single sourced bearing database. Over 800,000 discreet bearing part numbers with dimensions and related bearing frequencies for over 100 manufacturers worldwide. Used in over 60% of largest industrial manufacturers, as the data source for diagnostic and condition monitoring companies, by industry consultants and bearing manufacturers and distributors. Need bearing data for your analysis visit www.sourceindex.com smartini@sourceindex.com
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HIGH FREQUENCY IN STEAM TURBINE

Vibrant ·
Hi Experts, We are observing high frequency vibration in the steam turbine at 69,938 cpm. This individual frequency is dominant with amplitude of 5 mm/sec RMS. The same frequency is observed in hor, ver, axial directions. Rated speed: 1500 RPM. MFR : Dresser Rand, turbine directly coupled to fan. For vibration measurement we are using SKF microlog and accelerometer with magnet base mounting. Fan vibration is normal and no presence of 69,938 cpm. New equipment , we don't have previous...
Topic

Chillers and Air Compressors

Avinash Thawani ·
Please can anyone share details about Chillers and Air Compressors. Understand the chiller compressors and identify fault frequencies Understand air compressor and identify the fault frequencies
Topic

Low frequency (<10Hz) vibration switch

dgeesaman ·
I would like to find a standalone switch that will respond to 2 mils displacement (p-p) at 5-7Hz. So far all I can find are accelerometer based switches that lack the low-frequency sensitivity. Thanks, David
Topic

Rotor Bar Pass frequency (RBPF)

Raul Rios ·
Dear all. When you detect the RBPF in an induction motor, what recommendations should be made? What is your recommendation or experience in these cases? Regards, Raul Rios
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Unknown Frequency in Planetary Gearbox

jvaugha1 ·
Hi, I have been watching a frequency that I can not identify for a year now. It has been increasing every time I take a reading. The frequency is at 55,195. It looks as if it could be a side band of 2xGMF but I think it is an independent frequency. It has increased from .82 mm/sec in November last year to 6.697 currently. I can see this frequency in the motor and 2nd stage of the gearbox but has only increased in amplitude in the 1st stage. Any help is appreciated. I will try to give all...
Topic

Frequency of rotation for installed spare equipment

DHarberts ·
We have several instances in our facility where we have an "installed spare". I believe it would be a best practice to rotate them into operation on some frequency. I would imagine that the frequency would vary depending on the equipment and process but I am struggling to convince the operations group to begin this practice. What are the current practices through out industry and what is everyone's experience with this?
Topic

VI Category II Vibration Analysis Course in Bangalore

Narendra Murthy ·
Category II Vibration Analysts are qualified to perform basic vibration analysis using single-channel instruments according to established procedures, set-up instruments, and maintain a database of results. Minimum Experience Required : 3 years Minimum Training Hours: 38 hours Overview: This course prepares attendees to perform basic machinery vibration analysis on industrial machinery using single-channel measurements, with or without triggers signals, according to established and...
Topic

1X AC line frequency excitation in Motor

The Maniac ·
A centrifugal fan 168 kW, 1480 RPM Overhung with Flexible pin bush coupling was running normal with vibration max 3 mm/s since 4 years. There was a sudden increase in vibration at 2x RPM frequency up to 8 mm/s inin coupled condition at motor NDE side Horizontal and fan NDE vibration observed max 3.6 mm/s with minor looseness symptoms . Motor Solo run was taken and observed with 1x Line frequency(49.97 Hz) observed dominant in spectrum with vibration observed up to 3.4 mm/s in motor NDE...
Topic

GEAR BOX VIBRATION MONITORING

ALI HAIDERR ·
Daer All, Can you please assist me to set FMAX,and Resolution for Gear box vibration monitoring, Gear Mesh Frequency (GMF) = No. of teeth x Shaft Speed = 73 x 7950 = 580350 CPM or 9672.5 HZ How much Fmax and Reolution? Is 100 mv/g sensor is recommended to take vibration data by off line data collector.? There is no online accelrometer installed on it.Only proximeter probes are installed. No. of teeth at input shaft 73 No. of teeth at output shaft 43 Rated Input speed 7950 Rated output speed...
Topic

Spindle Frequency?

LukeBarber ·
I bought and installed a new 2hp water-cooled spindle with an inverter to run it. Inverter is https://www.valinonline.com/products/esv152n02yxb . Now, whenever I switch the spindle on it triggers my limit switches (in Mach3) and I can only reset it when the spindle is not running. Would adding a line reactor to the inverter help? Spindle and limit switch wiring is all shielded and properly grounded. Limit switches are configured as normally closed. I’m virtually at a standstill. Any help?
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Bearing fault frequencies for Bosch Rexroth A2V500 Hydraulic pump

BLPayton ·
I have three of the hydraulic pumps listed in the attachment. (Rexroth A2V500HDLOR 5GPK/79) The pump is made in Uchida Japan. Part numbers 1100132855 (ball bearing for main drive shaft); 1303021918 (roller bearing for main drive shaft) & 1606049689 (roller bearing for swivel housing) I am having trouble getting the OEM numbers above translated into a bearing number that I can get fault frequencies for. In my motor circuit analysis Demod spectrum I am seeing non-synchronous peaks on two...
Topic

Large Bearing Fault Frequencies

Costa Ilic ·
Hello to all, I am wondering if you could help in determine large bearing fault frequencies. It is possible to find it online is what detail dimensions of them are in order to estimate it. I am interested in those bearings:  FAG 564647 Split Bearing (700/460 x 245)  FAG 527466 (1000/1210 x 92)  FAG 527463 (670/820 x 69)  And similar bearing that I do not have number, with dimensions (1360/1120 x 106), should be FAG F-801007.ZL. Where to find information about those...
Topic

Atlas copco compressor concerning vibration values

Hossam 2 ·
Hello All  my case is an atlas copco compressor GA132w-10 fitted with 3000 RPm Motor ABB  number of male element and female element is not known but i suspect something will show you in the spectrum  ths the sharp frequency is 6XTS i think its related to blade pass frequency the the time diffrence between the impacts in the waveform =0.003418 second  so related to frequency =(1/0.003418)hz=17554.12 cpm if we check which order is this frequency we found that 17554.12/3000...
Topic

Frequency Bandwith

Avinash Thawani ·
Do you think market is large for sensors with 2kHz band width?
Topic

Bearing Defect Frequency

Avinash Thawani ·
Hi, I have the following bearing details, kindly advise me what is the rolling defect frequency. I am running the speed at 19Hz. Hertz CPM Orders Shaft speed frequency 50.000 Hz Inner race defect frequency (BPFI) 247.501 Hz Outer race defect frequency (BPFO) 152.499 Hz Cage defect frequency (FTF) 30.938 Hz Ball spin frequency (BSF) 99.323 Hz Rolling element defect frequency 198.645 Hz
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Pole Pass Reading in Standard Route Readings

oju ·
Was wondering how many here take high res readings to monitor pole pass in their standard route readings? If so have you found issues?
Topic

Bearing Defect Frequencies

Rennie Cachia ·
Hello, Does anyone has the bearing defect frequencies for a UC206 bearing please? This self aligning bearing mounts into a P206 pillow block. Thank you.
Topic

Suspecting LOBE MESHING FREQUENCY at blower

abhiramkompella ·
Technical Details: Motor: 1479 Rpm, 201 Kw, Type of coupling pulley belt drive, BHEL Make. Blower: 1515 Rpm, 121,38 m3/min, 3 lobe blower, RKR Gbleaze Make. We have a Empty Chamber (EC) Blower in our CFBC Power Plant, running with a high vibration from last one year i.e., 13.5mm/s at blower DE & Nde horizontal & Axial directions. Spectrum indicating 3X and 6X running rpm of blower...and the blower contains (3+3) lobes and at nde it has two gears. Because of 3X Rpm of blower...
Topic

Aproximated bearing fault frequency calculation

Ander ·
Hi guys has someone information about the effectiveness of bearing fault frequency calculation. And the formula to calculate it. I am using the one provided by csi and Charlotte. I am trying to find out the frequency of morgan ntm mill. Thanks.
Topic

Examples Of High frequency vibrations?

Vibration_guy ·
Is there any example of high frequency vibrations more than 40Khz.(with calculation please.) . i need at-least 2 or 3 examples.
Topic

Quincy QSI 1500 Compressor Bearing Numbers

Wayne0637 ·
Does anyone have the bearing numbers and locations for a Quincy QSI 1500 compressor? The parts manual just shows where there are bearings and gives no information on them. I can not find anything on their website and am not getting a response back from the contact us page.
Topic

Line Frequency 50 HZ

ALI HAIDERR ·
Is it possible vibration may appear on line frequency(50 HZ)?and what is the reason of this? We experienced a high vibration on motor with exciter even RPM 69 during startup upto 500 microns. Dominant peaks are 50Hz and 100 Hz. Then electrical department replaced some diaodes in exciter of the motor,now motor is running ok. But i want to know that why dominant vibration was on 50HZ(line frequency)?even motor speed is 1500 RPM,
Topic

coherence measurement

aziz58 ·
dear all some vibration analyzers have coherence parameter . i want to know , can h use this measurement when i have some unknown frequency on machine or other related part to find relation of those frequency with rotational frequency . how can help me this parameter for vibration diagnosis? pls share your experience best regars
Topic

Screw compressor vibration on-load vs. off-load

abdulbasitb ·
What changes are normally expected in the vibration spectra of a screw-type compressor when it's on-load vs. off-load?
Topic

Belt Frequency

Motorman1969 ·
I know this topic has been done over and over on the forums, but i am asking a specific question.   Is it possible to have a 1/2 order of belt frequency?   What I have experienced on one center hung fan, operated via motor and pulley, is a...
Topic

High vibration in vacuum pump

ANNEVIB ·
Hi all! I am experiencing high vibration problem with a condensor vacuum pump in a 500 MW coal fired plant. The vane pass frequency is appearing in spectrum. There are two vacuum pumps out of which only one is kept in service. The same problem...
Topic

Frequency vs. Plunger force belt tensioning

dgeesaman ·
We are an OEM who build a product with a synchronous power transmission belt.  We use plunger force tools or even thumb pressure to set belts but those don't give a "value" to be recorded on checksheets.   We tried a Gates 308-C Sonic...
Topic

high vibration on a centrifugal fan loosed bearing

alainraad ·
how can i change the natural frequencies of a centrifugal fan other then adding weights?
Topic

natural frequency

alainraad ·
how to change a centrifugal fan natural frequency without adding weights
Topic

HIGH VIBRATION AT GEAR MESH FREQUENCY

dominich.vo ·
Hi all, please help me to diagnose one case about gearbox system. The system has been described in detail on attachment. The spectrum indicate high vibration at Gear mesh freq. (GMF) with harmonics and sideband of rotating speed. Base on spectrum data...
Topic

Belt driven fan high vibration

Ahmed Gomaa ·
Hi all, Could you please help me with this high vibration belt driven fan, where high predominant 1.59 X Motor speed (2363 CPM) @ 14 mm/s, with 1X Motor speed @ 6mm/s in Horizontal (Belt tension direction) and axial DE & NDE. Motor speed: 1485 Speed ratio: 6 Fan speed: 247.5 Motor Pulley diameter: 142.6 mm Fan pulley diameter: 855.6 mm Center distance: 1082 mm Belt length: 3850mm Calculated belt RPM = 172.72 No of blades: 6 GE (enveloping) readings are very low These readings was taken...
Topic

An motor abnormal sound (power frequency 50hz) and vibration fluctuation with the dominant vibration frequency of 100 Hz

Vastocean ·
Hi guys, We are having an issue with a centrifugal pump which needs your advice. The motor has an abnormal sound, the vibration of both motor and pump are fluctuating from 4.6 to 5.7 mm/; the dominant vibration frequency is 100 Hz and the strange frequency range of 2800 to 3500 Hz appears. The brief information of equipment as follows: In May 2016, the vibration increased at both the motor and pump from 3 mm/s to around 6 mm/s and fluctuated from 5.3 to 6 mm/s, the dominant frequency at 100...
Topic

400HP Vert. Pump Motor Slow Beat Frequency

ThomasAH ·
We have 5 identical pumps running side by side all at the same speed, and I know what you're going to say... "Their vibration frequencies are modulating each other!" Unfortunately I don't think that's case (but I could still be wrong). We've only noticed on one of the motors that there is this relatively long beat frequency. See attached. Bearing faults aren't lining up, rotor bar and stator slot frequencies aren't lining up either. The motor is a 400HP, GE L5011VP, 460Volts, 1180 RPM. It is...
Topic

An unknown frequency observed at Gearbox

sany ·
Hi, This is equipment of Steel Industry from Bar Rod Mill unit. Equipment is Mill Stand, Which is having reducer gear. The Input shaft have 24teeth and mating gear has 63teeth. Intermediate having 19,66 teeth and output shaft having 31,31teeth. I didnt have any problem with vibration whenever the higher dia bar is rolled vibration will be 4.0mm/sec peak and during lesser dia bar rolled it will 2.5mm/sec peak. The spectrum is showing a high amplitude dominant peak of 73.1orders of input speed...
Topic

Gearmesh Frequency Question

P. Hine ·
This is a Centac Air compressor( Mod 2CV25M3E) driven by a 600 HP motor. Any guesses as to what the gear mesh frequency might be? Reading was taken with a 10mV high frequency accelerometer at 12800 lines resolution. I am still trying to find some info...
Topic

Acceptable bearing frequencies

tcvib ·
All, Have a question for the group.  How much vibration, at bearing frequencies, is acceptable in a reconditioned motor?  Have a reconditioned motor  that is indicating loooow (.004 in/sec Pk)amplitude vibration at inner race bearing...
Topic

High Frequency Haystack - is this lack of lubrication

MarkSl ·
Hi I collected data from a 2 week old vertical mixer which is noisy and sounds like a dry bearing. The motor uses sealed bearings so they cannot be lubricated. The high frequency vibration data shows a haystack between 2KHz and 2.5Khz primarily...
Topic

Electric Motor Bearing Grease - quantity and frequency

TroyS ·
I've calculated a whole bunch of grease quantities and ideal intervals for our electric motors in a plant environment.  To manage the work load we've fixed our routes to 60 days.  This is where my question comes in -  I'm not concerned about adjusting the grease quantity down when the calculation tells me to less often.  Example  - calculation tells me to add 100 grams of grease every 120 days and set our program at 50 grams every 60 days.  Where I get concerned...
Topic

Emerson AMS Suite Fault Frequencies

KronoChris ·
Hi all, I'm running into an issue using Emerson's AMS Suite. I've built a few hundred pieces of equipment on this software. I've noticed if I build a piece of equipment , say a fan but I do not know the bearing numbers. One day I stumble across the mfg. and bearing numbers I need. So I'll go into RBM wizard and add the bearing information. I will then exit/save then hit the almighty hammer. I will reload routes, even reboot the software. I will then collect data on that particular fan and...
Topic

Frequency Reponse of Bently Nevada 3300 XL Probe

FSX ·
Dear Experts Can some one help me understand attached frequency response curve of Bently Nevada 3300 XL 8mm dia probe I have come across frequency response curves of certain accelerometers which show sensitivity on Y axis and frequency on X-axis. Near resonance frequency there is sharp rise in sensitivity. However the curve given in Bently Nevada 3300 XL 8 mm dia probe shows magnitude in db on Y-axis and frequency on X-axis. I am not understanding what this "db" refers to ? May be noise ? If...
Topic

Looking for forcing frequency info on I/R screw compressors

Chesapeake Reliability ·
We recently installed a number of Ingersoll-Rand H75A compressors, but have not been able to obtain any information on things like tooth counts that would help our monitoring efforts. Apparently, Ingersoll has been unwilling to share any information, deeming it proprietary. Any suggestions as to where we might be able to get this information would be greatly appreciated. Thanks, Tim W.
Topic

Where to Attach Weight or Stiffen the Structure to Get it Out of Resonance

engr.Abdullah ·
Dear Experts, Hope you are fine. I want to know that is there a method by which we can know that where should we attach the weight or which location should we add support to stiffen the structure to change it natural frequency. I heard somewhere that there are nodes and anti-nodes by which we can know where to make modification. Is it possible to know by just using our analyzer and vibration sensors? Or it is only possible by ODS or Modal Analysis in FEA software?
Topic

Frame structure natural frequency

aziz58 ·
Dear all I am looking for safety margin of opearating frequency of machin compare to natural frequency of its frame structure ? As you know we have been many exciting frequency in machin such as gear mesh, blade pass ,.. Which of should be consider for frame structure design ?all of them or only operating frequency Best regards
 
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