Vibration Analysis for beginners 4 (Vibration terms explanation, Route creation)
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- čas přidán 8. 07. 2024
- adash.com/
Frequency, Amplitude, Period, RMS, Spectrum, Frequency domain view, Time domain view, Time waveform, Displacement, Velocity, Acceleration - in this video we will explain the main terms for vibration analysis measurement and how to create a factory measurement journey known as a route for your predictive maintenance in condition monitoring program.
Frequency is (in vibration measurement) the number of occurrences of a repeating event per second, and the unit is Hz.
Period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency.
Amplitude is the maximum extent of the repeating event.
The RMS value for sinusoidal functions is 1⁄√ 2(it equals approximately 0.7) of the 0-Peak amplitude.
Amplitude can be measured or displayed in 3 types of Physical quantities: Displacement, Velocity and Acceleration.
Displacement means the distance between the stable and exceed position. Units are mm, micrometer or thousandths of an inch, or mils if you prefer.
Velocity is the rate of a change of a distance (displacement) with respect to time. Units are mm/s, or ips. Acceleration is the rate of a change of a velocity with respect to time. Units are g or m/s2.
We have 2 main ways of displaying the vibration signal ( for us this means Frequency and Amplitude).
The first one is the Time waveform or Time domain view.
The second type is the Spectrum or Frequency domain. It is the view of each frequency component of the sensor´s total movement. It allows us to see all amplitudes of frequencies the time waveform is made of separately. According to Fourier analysis, any physical signal can be decomposed into a number of discrete frequencies, or a spectrum of frequencies over a continuous range. You can imagine a spectrum as an equalizer which is visualizing the amplitudes of the frequencies the music is made of.
How to create a factory measurement journey - The Route.
For the beginning of our Predictive maintenance program we will use 2 measurement types per measurement point - velocity in mm/s and acceleration in g. The measurement point is the place on the machine where we will be taking the measurement. There will be more measurement points on each machine. For example, on each bearing housing of the machinery component plus one on the axial direction on the machinery set. We will create our route tree in the DDS software and it will basically guide us to which department we should go, to which machine and where to place the sensor to take our measurements.
Track the trend of vibration.
Now you have created your Route tree and you regularly measure your machines (e.g. 2 times per month). It is time to track the trend of vibrations on individual measuring points and see their development in time. Is your trend of velocity and acceleration measurement stable? A stable trend with acceptable values means that your machine (or bearing) is running under stable conditions, then you should not be worried and this machine can be operated without any restrictions.
Attention: Even if the trend is stable, there can be cases when the machine will break down without any warning. This can happen for example if the machine runs with some manufacturing defect. It does not happen very often, but it happens. Is your trend of velocity or acceleration measurement rising? Is it the Velocity measurement? Then as we learned it will be a mechanical fault related to the speed of the machine such as unbalance, misalignment or looseness. You should measure the machine more frequently and look for a deeper analysis of the machine to find out what the problem is. Is it the Acceleration measurement? This higher frequency measurement is most often related to bearings. Grease the bearing. Measure it more frequently and if the value is still rising you should plan to change the bearing.
Predictive maintenance, and particularly vibration measurement, is one of the best and most proven methods for knowing the actual condition of your machinery. It allows you to track its condition over time and enables you to plan / schedule potential repairs of the machine. However, it can never work 100% and some sudden machinery break downs can still occur.
To keep your machinery running, try to do more than just regularly measure your vibrations.
• Be smart, try to get to know your machine
• Keep your machinery clean
• Observe the machine, look for potential oil leaks, air leaks etc.
• Look for potential foundation cracks, structure cracks, loose bolts
• Listen the machine. Especially look for sudden noise change.
• Share information about the machine. Use the „Buddy System“. In other words, if you discover some unusual behavior in any machine, tell your work mates. You can not only avoid an unexpected break down, but you can also save your colleague's life!
00:00 - 02:50 Vibration signal
02:50 - 05.30 Frequency domain (spectrum) / Time domain
05:30 - 11:04 Factory measurement ROUTE - Věda a technologie
I was the vibrations test engineer for solona i. Arizona this is a great video great work
4:10 that was absolutely a very great practical engineering example of DFT
Well explained Adash.....👍
It helps me more
As I'm Fresher this video gave more knowledge.
Because tomorrow I have an interview in CMS
So that I just prepare some basics...
And it helps me lot........
Thank you and Team........
It's amazing, very well explained
I am grateful for the content congratulations
Excellent explanation of vibration measurement
very best explanation with animation.
Thank you sir ❤️
It's good video and very useful for training to the our customer.
Glad to hear that, thanks!
You guys make really good vibration video
Thank you, we are happy to read such a comments :-)
Make like that videos its very useful for my carrier pls continually upload
We will surely continue sir !
Good video quality and i find it clear to understand, keep it up guys
Thanks, will do!
Excellent
It is very nice video with very good animation and editing
Thank you sir!
GOOD PRESENT
How could I obtain the relevant acceleration by taking into account the Fourier transform? Because if you use the Simple Harmonic Motion, acceleration will always increase as frequency increases. In reality, structures are affected by certain frequency. So, how can I consider both the peak acceleration and the frequency in which my structure will have resonance effects?
We would like you to elaborate your topic more please as it is not totally clear to us. Please write on our technical / sales support for further discussion: revaj@adash.cz
Hi! Amazing video and great animations! Is the are a way to know which software was used to create the animations? Thanks!
Software is called motion from company who has kind of fruit as logo ;-)
@@AdashCompany Thank you very much!
Thank you for the really nice video with wonderful animations. easy to understand. my question is on physical implication of velocity. you measure acceleration on the machine and choose to look at velocity value. what/how does velocity help to understand vibration better than acceleration or displacement?
Very simply speaking. Velocity is mostly used for lower frequencies for the whole machine body vibrations related to the speed of the machine where you are looking for faults such as unbalance, misalignment, mechanical looseness etc. Velocity simply works the best for that. On the other hand higher vibrations of bearings are more "visible" using acceleration measurement. Displacement mostly measured by proximity probes on turbines for more sophisticated measuremets of Orbits, Centerline etc.
Very good explanation, I have a question, a lot of data is required to do this vibration analysis? Why if monitoring is done all day then we will have the storage problem, right?
Thank you sir. There is no need for acquiring a lot of data. Our smart monitoring systems avoid of storage problems.
hi, if i have acceleration, displacement, amplitude, velocity, frequency, how can i use that data to generate future values of my sine wave? I want to see how the sine wave will look with vibration.
There is no mathematical formula for that.
If output of a vibration sensor is 4 mm/s. What does it mean?
There is no human being who can answer to this general question. Ok, we can answer like this: We are measuring vibrations in velocity unit and measured object is vibrating 4 mm/s. But I guess this answer will not help you. Please write us on info@adash.com with more details about your vibration measurement and we will try to guide you.
Could you please tell us about fault bearing analysis
We keep recoding new videos and we will surely make one about bearing analysis. Stay tuned ;-)
Dobrý den.Prosím vás, je možné umožnit u těchto vašich velice užitečných videí automatický překlad titulků do češtiny?
Dobrý den, zde je návod jak na CZcams zapnout České titulky: adash.com/cs/podpora/tutorialy/automatic-subtitles-translate/
can u explain the formula to acummulate that three factor(velocity, acceleration and displacement) to know the type of problem?
Very simply speaking. Velocity is mostly used for lower frequencies for the whole machine body vibrations related to the speed of the machine where you are looking for faults such as unbalance, misalignment, mechanical looseness etc. Velocity simply works the best for that. On the other hand higher vibrations of bearings are more "visible" using acceleration measurement. Displacement mostly measured by proximity probes on turbines for more sophisticated measuremets of Orbits, Centerline etc.
Small doubt .. is it possible to convert vibration to noise ( mm/s2 to db ) ?
You can convert anything to dB. It is a relative / reference unit on a logarithmic scale.
Good
good vedio
Thanks
2/12/2021
why are the amplitude units mm/s @ 5:23 it should be mm right?
Do you have example of deterministic Vibration?
Sorry but we do not have any example for that.
Talk about the AD40000 equipment 😅
Cummins Allison 852 Feehanville Drive Mount Prospect,IL 60056 fired me after 16 years loyal service because I would not stylus whip pm tickets for their own pm paying customers like Dover Downs in Delaware. The DOJ here blew off my report and that hit real hard to my integrity.
Fired and Blackballed...sad :(
Hindi me video baniye
Excellent
Thank you so much