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Modal Analysis of centrifugal pump base frame using ASNYS Workbench

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This video explains FEA Analysis of base frame of centrifugal pump & motor. This video briefs about introduction to modal analysis, equation, assumption and limitations of modal analysis. It also explains ansys simulation part like mesh creation FEA deck preparation, analysis setting for modal analysis. It explains analysis results like mode shapes, natural frequency, participation factors, how to avoid resonance, significance of participation factor, etc.
Update in video:
For modal Analysis, the linear equation of motion for free:
Un-damped Vibration: Mü +Ku=0
Damped Vibration: Mü+Ců+Ku=0
here, u is displacement not velocity (ů).
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#GraspEngineering
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Опубликовано:

13 июл 2018

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Комментарии : 139

@MechScience 8 месяцев назад

Truly great content. in all of the data that has been dumped in RU-vid this is something highly unusual actual useful content that nobody willing to teach.

@sandeshhegde9423 4 года назад

This video precisely explains interpretation of modal analysis. Thank you and please keep posting such videos.

@graspengineering9249 4 года назад

Thank you for appriciation

@RasikKuware 4 года назад

You are the best sir! What a great understanding of software! And explanation is awesome ! I will recommend your channel to my friends also.

@graspengineering9249 4 года назад

Thank you for Appreciation !

@RasikKuware 4 года назад

Thanks sir keep making such great videos !! You are the BEST !!

@graspengineering9249 4 года назад

Thank you for Appreciation !

@mangeshdeshmukh2140 4 года назад

Nicely explained , keep making videos.

@graspengineering9249 4 года назад

Thanks

@AV-bp3bc 4 года назад

I appreciate your work. Keep it up.

@graspengineering9249 4 года назад

Thank You !

@realkanavdhawan 3 года назад

Thank you so much Sir Precise and to the point

@graspengineering9249 3 года назад

You are most welcome

@scknylmz 4 года назад

Thank you for clear explanations.

@graspengineering9249 4 года назад

Thank you for appreciation !

@vishalchauhan1000 5 лет назад

Love you man..Keep making more videos.............

@graspengineering9249 5 лет назад

Thank you ! Please find more videos on our channel #graspengineering

@anandpatidar1566 4 года назад

Thank you Very beautifully explained

@graspengineering9249 4 года назад

Thanks and welcome

@nanjunisarga6882 6 лет назад

Great video. and the concept of mass participation factor is itself a study in this session , thanx for your time. if possible please make the continuation part of the analysis such as random psd , frf . indeed it's really beneficial . thanx once again.

@graspengineering9249 5 лет назад

Hello, You will find more videos on #graspengineering channel mentioned in the description. You will find random vibration video too, link:. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-m7fAvQa59N4.html

@nasylingenierias.a.s.1203 4 года назад

You're the best !

@graspengineering9249 4 года назад

You can refer from Grabcadd library

@AnnaA-iv4rk 3 года назад

Thanks for shearing :)

@graspengineering9249 3 года назад

Thank you !

@somireddyatla9986 3 года назад

Good explanation sir....

@graspengineering9249 3 года назад

Thanks and welcome

@mahdimusapour6744 8 месяцев назад

very great

@graspengineering9249 7 месяцев назад

Thank you

@amiraboodi2075 3 года назад

thank you very much.

@graspengineering9249 3 года назад

Welcome !

@sowmiyasowmi1550 4 года назад

Awesome

@graspengineering9249 4 года назад

Thank you !

@trauma2441 5 месяцев назад

Hi! Could you please tell, why behaviour of your point masses was set as Deformable and not Rigid? Dont they stiffen enough the frame?

@hanyuzhi9864 5 лет назад

hello, thank you for your video. Would you tell me where I can find out your previous video?

@graspengineering9249 5 лет назад

Welcome, You will find more videos on #graspengineering channel mentioned in the description. Please check few link for base frame FEA like ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-m7fAvQa59N4.html

@trungnghiale8286 5 лет назад

thank you for the video. I did not understand the point you talked about at 20:42 , why and how we assess the mass ratio ?

@graspengineering9249 5 лет назад

The respective mass ratio is important to understand the participation of the respective mode. It represent the mass contributing to that mode and the sum of total ratio represents the total participation, suppose it is 90% in x it means 90 mass is taken into account into x direction. It suppose you have less mass participation then you can use missing mass or further increase modes to account more mass.you can access through output window in APDL & solution information or output file in workbench.

@ToanTran-ve6fj Год назад

can you do static analysis with apply nozzle load

@1311jigar 4 года назад

Hi! How will you decide that the number of modes extracted are sufficient. For example: You considered point mass for compressor and motor. Both point masses do not have connection with each other. But there can be twisting of the connection between compressor and motor which can add mode that might be severe. And we don't see such modes on compressor bracket and motor bracket in the shown results.

@graspengineering9249 4 года назад

Hello, at present we are interested to analyze base frame and hence we are more interested to see the frame mode shapes. So we assumed both motor and compressor as point mass. Surely their is impact on modeling of motor & compressor, the stiffness of both motor and compressor will impact on mode shapes and natural frequency. The better way to perform analysis is to model the complete the frame and simplify the compressor and motor geometry and attached as per actual scenario with correct mass.

@sona7871 2 года назад

Very helpful. What type of support would be accurate under a Block type machine foundation for modal analysis ? Is it elastic support or is it right to assign compression only supports.

@graspengineering9249 2 года назад

Elastic or compression only supports are representation of actual support conditions in FEA. You need check your model and accordingly choose the BC in FEA.

@sidm6992 7 месяцев назад

Sir I want to know why tapping is given on the holes of a base frame for pump and motor installation?? Why not drilling the holes.

@SultanKhan-gi1in 4 года назад

Hi! You have taken point masses at a remote location...Is it same as Lumped mass technique?

@graspengineering9249 4 года назад

Yes

@cpkewat 5 месяцев назад

Hi. There is one doubt. May be very simple for others. We are assuming acceleration load is coming due to pump and motor. If same load is coming from external shocks which excite the fixed support first like seismic load. Plz suggest

@kaushik2758 4 года назад

Great tutorial sir.If you provide the link of 3d models, it will be more helpful for us.

@graspengineering9249 4 года назад

Thank you ! We referred geometry file from grab-cad library.

@TR1IBUNAL 3 года назад

did you get 3d model?? if yes please share

@muhammadtayyab6280 4 года назад

Thank you very much sir! i have a question: after conducting this modal analysis how can we choose a damper for the frame or the motor and pump mounts? Any help will be appreciated!

@graspengineering9249 4 года назад

It is difficult to select the modal analysis results like mode shape and natural frequency. You might further need to perform the dynamic analysis (frequency response) for various damper and their compare the results withe each other and then select the most suitable.

@muhammadtayyab6280 4 года назад

@@graspengineering9249 Dear sir, i have a base frame sort of like yours on which an ic engine a gearbox and a generator are mounted. Now, from what i know any structure has infinite mode shapes and the natural frequency modes should not resonate with the excitation frequencies. This is to reduce vibration and as long as the two do not resonate the system is stable right? Also can you suggest any tutorial for dynamic analysis(frequency response). Thank you very much!

@venkychotu4663 3 года назад

Please do the harmonic analysis for the same base frame and also apply damping to the base frame super presentation by the way

@graspengineering9249 3 года назад

Please check description playlist, We have another video of harmonic analysis on other frame.

@venkychotu4663 3 года назад

@@graspengineering9249 for the same base frame there is harmonic analysis using workbench if there is can please put a link in the discription

@amvali 3 года назад

Would you be able to send a link to the video that you model frame and added weld joints?

@graspengineering9249 3 года назад

Please check this video link for 2D midsurface and weld work in ANSYS. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hzdRHs3VWHI.html

@chandannaik8894 4 года назад

Please make a video on modal plus harmonic analysis. We want to know how conduct a harmonic analysis for 1 octave sweep in ansys.

@graspengineering9249 4 года назад

Okay

@abhisheksingh-yj7xv 3 года назад

Hi, What is the link for the reference for the geometry shown? please mention here if possible. Thanks in advance

@graspengineering9249 3 года назад

Hello Please find below link from which you can download it. www.graspengineering.com/centrifugal-pump-base-frame-cad-model/

@nellaiapperanand3007 5 лет назад

Thank you for the video Sir, how validate the results. How to determine the resonance frequency? I need to know what frequency it is failing and how to determine it

@graspengineering9249 5 лет назад

Welcome! Resonance will occur when excitation frequency of equipment matches with natural frequency. So first check excitation frequency and correlate with natural frequency, if it matches it means chances of resonance.

@nellaiapperanand3007 5 лет назад

@@graspengineering9249 excitation frequency means prestressed frequency table data to be compared with without prestressed modal analysis.. kindly guide me sir

@graspengineering9249 5 лет назад

In present case, Motor and centrifugal pump are idealized using mass element, both of them are rotating at some frequency or having some frequency, is called excitation frequency, Which we compare with natural frequency of base frame.

@nellaiapperanand3007 3 года назад

@@graspengineering9249 Sir, Thank you! im studing again from your videos. Can you please guide me reference standard journals so that I will do case study on Modal+Random vibrations. Also please suggest us which book is more suitable to learn FEA Dynamic analysis

@sumendukumar8050 3 года назад

good

@graspengineering9249 3 года назад

Thanks

@minaelias1682 4 года назад

Is it possible to scale this up, lets say this pump was in a basement and you'd like to see its effect on the ground floor of the building. What do you think.

@graspengineering9249 4 года назад

Yes, their will be effect. But usually their is some medium between pump and base floor to dampen the vibrations.

@tapan4253 4 года назад

i want this model this frame how can i get it please tell me. if i want to do same funtion in my software then i don't have any models for pratice

@graspengineering9249 4 года назад

Hello. Most of cad model used are refereed from grab-cad library. You can refer link of the video below: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JdJ2FTcvFKc.html. Also we started uploading cad model too, refer this link: grabcad.com/grasp.engineering-1/models

@divyanshmahajan7349 3 года назад

If you can suggest I am not able to get natural frequency from modal method??

@graspengineering9249 3 года назад

Check your FEA Model connection, if few bodies are flying then you will zero frequency. Also if you have not fixed your model then first six mode are zero frequency mode, in such case you should extract more modes.

@huseyingozukara706 3 месяца назад

can you share pump drawing ?

@bssj7578 3 года назад

Hi, one question, motor and pump in the real instalation have a coupling between them, is necessary to use any contact between masses in the software?. In the video you use masses without relation/conection between them. Is correct to do this? Thank for your video

@graspengineering9249 3 года назад

It is not possible to create contact between mass elements, In order to consider the connections as well as consider stiffness of both motor & pump, it is necessary to model both motor & pump in FEA Model. If you are looking to study only base frame then simplest way to idealized using masses and connect to their fixing point. The first approach is more realistic, but second one will also give similar results as first approach have negligible effect on results.

@bssj7578 3 года назад

@@graspengineering9249 Thanks for your answer.

@graspengineering9249 3 года назад

@@bssj7578 Welcome!

@Mankibaataapkesath Год назад

i do the same simulation for rail track, but i am not getting the ration of effective mass to total mass as 80-90%. kindly suggest the case

@graspengineering9249 Год назад

Try to exctract few more mode shapes to gain more mass participation factor.

@amvali 3 года назад

Would you please explain about three different type of Modal analysis a little bit more?

@graspengineering9249 3 года назад

Please refer theoretical part. We will cover free free and fixed type modal analysis in our blogpost.

@amvali 3 года назад

@@graspengineering9249 Thank you. I tried your blog post and it says that blog has been removed

@gujexp25 6 лет назад

I have a base frame for dynamometer that runs at 18000 rpm. I modelled 3d model and completed 6 modes. Lowest fre. Required is 30% higher than operating speed as per dyno manufacturer. I need help to understand constraints and results. Thank you

@graspengineering9249 6 лет назад

You can either use constraints as per foundation or do free free analysis without constraints, in which first 6 modes are rigid body and later on you will get required modes. If you are expecting lower frequency 30hz more than operating then you can do design changes if you are not getting.

@gujexp25 5 лет назад

@@graspengineering9249Thank you for reply. You have point mass for motor and pump but both has stiffness. Is it ok to just add mass? If i do free free analysis 7th mode is 120hz. If i constrain i get 330 to 430 hz depend upon how i constrain. Sorry i m asking too many questions..

@graspengineering9249 5 лет назад

While entering mass, you can even enter mass moment of inertia in respective directions, it is further more accurate. You can consider motor mass too it will further affect minor frequency. Instead of frequency you can check mode shapes in which directions it is moving, it should match with free free. We need to think according to realistic condition Wether we need to idealized as mass or modeled complete structure.

@gujexp25 5 лет назад

R u interested in consulting? Its too late for this job but next time.

@graspengineering9249 5 лет назад

If you need any kind of help or consultation please drop mail to us, We will provide help ASAP.

@satyamsingh675 4 года назад

Hi , can we get the CAD file of the base plate u have created ?

@graspengineering9249 4 года назад

Please find the geometry on Grab-cad Library. Refer our video for more explanation: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JdJ2FTcvFKc.html

@SapphireEngineering 3 года назад

We manufacture similar base frames for pumps

@gudimallamjothivinodhkumar2394 2 года назад

Whether the modal analysis is for centrifugal pump or for base frame?

@graspengineering9249 2 года назад

It is for centrifugal pump base frame. Centrifugal pump and motor are idealized using mass elements.

@SapphireEngineering 3 года назад

We machine similar base frames for pumps on our planomiller in ghaziabad. Some are even 4 meters long. And over 1 metre in height . Sapphire Engineering Company Ghaziabad

@graspengineering9249 3 года назад

You can share product video with us. We will try to highlight in our channel.

@SapphireEngineering 3 года назад

@@graspengineering9249 email ID

@gudimallamjothivinodhkumar2394 2 года назад

What is the natural frequency of centrifugal pump alone?

@graspengineering9249 2 года назад

You can include CP geometry and check the mode shapes coming on centrifugal pump or else model separate CP and perform the simulation.

@saurabhkashid8211 4 года назад

You write wrong linear equation it just [k]{U} not a {ù} (dot). {Ù} dot means velocity and it's for damping and just displacement {u} for spring. But very good presentation I appreciate that.

@graspengineering9249 4 года назад

Thanks for highlighting, Please kindly Check the Description.

@sanaullahansari9884 3 года назад

Hey, can you tell me which video to refer to create these frames please?! And what are the dimensions of the frame?! Please provide the link or name of that video

@graspengineering9249 3 года назад

Hello. For modeling you can refer our Spaceclaim and design modeler playlist. You can also download this model from our blogpost: www.graspengineering.com/centrifugal-pump-base-frame-cad-model/

@sanaullahansari9884 2 года назад

@@graspengineering9249 I downloaded the model, did all things, but from the downloaded model while solution I'm getting error of no volume defined. And I'm not able to define the volume, please help.

@vilashification 3 года назад

What is the natural frequencies for the motor & pump excitation ?

@graspengineering9249 3 года назад

Please check the modal analysis table shown in video. The first natural frequency is 13.1 Hz while excitation frequency is rotating speed of the motor.

@vilashification 3 года назад

@@graspengineering9249 Thank you sir, one more doubt- Normally the motor rpm is like 1000rpm so frequency if I calculate it's 16.67Hz, so do we need to consider electrical frequency of 50hz for comparison?

@graspengineering9249 3 года назад

@@vilashification Yes. You should consider the rotating RPM for excitation frequency. No need to consider electrical frequency.

@shekharhatankar5150 Месяц назад

How to gotten this step file for practice

@graspengineering9249 Месяц назад

You can download from our blgopost. www.graspengineering.com/centrifugal-pump-base-frame-cad-model/

@sachinnagavkar 4 года назад

May I get modeling video of this frame?

@graspengineering9249 4 года назад

You can refer from Grabcadd library.

@Bala92635 Год назад

How to verify the results are correct or not...like what are the ways

@graspengineering9249 Год назад

You need to verify the reactions and try to match with applied eight of the geometry.

@Bala92635 Год назад

@@graspengineering9249 thanks sir, but I didn't understand with what i need to match the reactions?

@antonaveendp2896 4 года назад

Sir can I get the link to download cadd file

@graspengineering9249 4 года назад

We referred from GrabCad and then did some changes in design modeler

@antonaveendp2896 4 года назад

@@graspengineering9249 OK sir thank you

@akshayjagtap2597 3 года назад

I need to do modal analysis of Electric Vehicle chassis. then how should i take different weight distribution. because there are some point loads and some UDL? if possible give me your Email ID i will briefly explain about my queries. It is very good for me if i get some help from you.

@graspengineering9249 3 года назад

Hi, It is similar exercise as explained in this video. You can even perform prestress modal analysis. In static analysis you apply your loads and connect results to modal analysis.

@trikal8949 3 года назад

Sir for vibration analysis.... Abaqus is better or the ansys..... ... I want to work in field of vibration .... Can i have u r email id...

@graspengineering9249 3 года назад

For vibration both are better...ANSYS is more user friendly....Abacus is better for nonlinear simulation...

@trikal8949 3 года назад

@@graspengineering9249 .. One more thing dear how u have learned all these..... I mean what are books video u have used..... R u phd student....?

@limcheehong85 2 года назад

Can share your drawing file to me for study purpose?😅😅

@graspengineering9249 2 года назад

Please refer this link for cad file. www.graspengineering.com/centrifugal-pump-base-frame-cad-model/

@limcheehong85 2 года назад

@@graspengineering9249 Thank you very much😍

@KanwaljeetJaura 3 года назад

Great explanation! Can you please provide your email id

@graspengineering9249 3 года назад

Thank you !

@KanwaljeetJaura 3 года назад

@@graspengineering9249 Can you please explain PSD Response curve in detail. How can we relate it to Modal analysis results

@graspengineering9249 3 года назад

@@KanwaljeetJaura The modal analysis is used to identify mode shapes and natural frequency while PSD is used to characterized random vibration of the equipment. We will cover more information on PSD in our blog. (www.graspengineering.com)

@KanwaljeetJaura 3 года назад

Thanks a lot. Please provide your email id , I need to clarify my doubt