Modal Analysis of centrifugal pump base frame using ASNYS Workbench

Рет қаралды 52,285

6 жыл бұрын

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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Channel Name:
#GraspEngineering
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Пікірлер: 139

@sandeshhegde9423 4 жыл бұрын

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

@graspengineering9249 4 жыл бұрын

Thank you for appriciation

@MechScience 8 ай бұрын

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

@RasikKuware 4 жыл бұрын

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 жыл бұрын

Thank you for Appreciation !

@RasikKuware 4 жыл бұрын

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

@graspengineering9249 4 жыл бұрын

Thank you for Appreciation !

@scknylmz 4 жыл бұрын

Thank you for clear explanations.

@graspengineering9249 4 жыл бұрын

Thank you for appreciation !

@realkanavdhawan 3 жыл бұрын

Thank you so much Sir Precise and to the point

@graspengineering9249 3 жыл бұрын

You are most welcome

@AV-bp3bc 4 жыл бұрын

I appreciate your work. Keep it up.

@graspengineering9249 4 жыл бұрын

Thank You !

@mangeshdeshmukh2140 4 жыл бұрын

Nicely explained , keep making videos.

@graspengineering9249 4 жыл бұрын

Thanks

@anandpatidar1566 4 жыл бұрын

Thank you Very beautifully explained

@graspengineering9249 4 жыл бұрын

Thanks and welcome

@vishalchauhan1000 5 жыл бұрын

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

@graspengineering9249 5 жыл бұрын

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

@nasylingenierias.a.s.1203 4 жыл бұрын

You're the best !

@graspengineering9249 4 жыл бұрын

You can refer from Grabcadd library

@AnnaA-iv4rk 3 жыл бұрын

Thanks for shearing :)

@graspengineering9249 3 жыл бұрын

Thank you !

@sowmiyasowmi1550 4 жыл бұрын

Awesome

@graspengineering9249 4 жыл бұрын

Thank you !

@amiraboodi2075 3 жыл бұрын

thank you very much.

@graspengineering9249 3 жыл бұрын

Welcome !

@somireddyatla9986 3 жыл бұрын

Good explanation sir....

@graspengineering9249 3 жыл бұрын

Thanks and welcome

@mahdimusapour6744 8 ай бұрын

very great

@graspengineering9249 7 ай бұрын

Thank you

@nanjunisarga6882 6 жыл бұрын

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 жыл бұрын

Hello, You will find more videos on #graspengineering channel mentioned in the description. You will find random vibration video too, link:. kzfaq.info/get/bejne/o52WdNmCxpudfmg.html

@hanyuzhi9864 5 жыл бұрын

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

@graspengineering9249 5 жыл бұрын

Welcome, You will find more videos on #graspengineering channel mentioned in the description. Please check few link for base frame FEA like kzfaq.info/get/bejne/o52WdNmCxpudfmg.html

@sumendukumar8050 3 жыл бұрын

good

@graspengineering9249 3 жыл бұрын

Thanks

@trungnghiale8286 5 жыл бұрын

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 жыл бұрын

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.

@trauma2441 4 ай бұрын

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

@venkychotu4663 3 жыл бұрын

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 жыл бұрын

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

@venkychotu4663 3 жыл бұрын

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

@sona7871 2 жыл бұрын

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 жыл бұрын

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.

@1311jigar 4 жыл бұрын

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 жыл бұрын

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.

@ToanTran-ve6fj Жыл бұрын

can you do static analysis with apply nozzle load

@chandannaik8894 4 жыл бұрын

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 жыл бұрын

Okay

@SultanKhan-gi1in 4 жыл бұрын

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

@graspengineering9249 4 жыл бұрын

Yes

@sidm6992 6 ай бұрын

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.

@kaushik2758 4 жыл бұрын

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

@graspengineering9249 4 жыл бұрын

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

@TR1IBUNAL 3 жыл бұрын

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

@amvali 3 жыл бұрын

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

@graspengineering9249 3 жыл бұрын

Please check this video link for 2D midsurface and weld work in ANSYS. kzfaq.info/get/bejne/nuCUhaukmLy7eH0.html

@cpkewat 5 ай бұрын

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

@muhammadtayyab6280 4 жыл бұрын

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 жыл бұрын

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 жыл бұрын

@@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!

@abhisheksingh-yj7xv 3 жыл бұрын

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

@graspengineering9249 3 жыл бұрын

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

@nellaiapperanand3007 5 жыл бұрын

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 жыл бұрын

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 жыл бұрын

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

@graspengineering9249 5 жыл бұрын

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 жыл бұрын

@@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

@divyanshmahajan7349 3 жыл бұрын

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

@graspengineering9249 3 жыл бұрын

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.

@minaelias1682 4 жыл бұрын

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 жыл бұрын

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

@amvali 3 жыл бұрын

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

@graspengineering9249 3 жыл бұрын

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

@amvali 3 жыл бұрын

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

@Mankibaataapkesath Жыл бұрын

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 Жыл бұрын

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

@tapan4253 4 жыл бұрын

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 жыл бұрын

Hello. Most of cad model used are refereed from grab-cad library. You can refer link of the video below: kzfaq.info/get/bejne/gMp6ZamFyNyqe5c.html. Also we started uploading cad model too, refer this link: grabcad.com/grasp.engineering-1/models

@bssj7578 3 жыл бұрын

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 жыл бұрын

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 жыл бұрын

@@graspengineering9249 Thanks for your answer.

@graspengineering9249 3 жыл бұрын

@@bssj7578 Welcome!

@huseyingozukara706 3 ай бұрын

can you share pump drawing ?

@SapphireEngineering 3 жыл бұрын

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 жыл бұрын

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

@SapphireEngineering 3 жыл бұрын

@@graspengineering9249 email ID

@gudimallamjothivinodhkumar2394 2 жыл бұрын

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

@graspengineering9249 2 жыл бұрын

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

@satyamsingh675 4 жыл бұрын

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

@graspengineering9249 4 жыл бұрын

Please find the geometry on Grab-cad Library. Refer our video for more explanation: kzfaq.info/get/bejne/gMp6ZamFyNyqe5c.html

@SapphireEngineering 3 жыл бұрын

We manufacture similar base frames for pumps

@sachinnagavkar 4 жыл бұрын

May I get modeling video of this frame?

@graspengineering9249 4 жыл бұрын

You can refer from Grabcadd library.

@gujexp25 5 жыл бұрын

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 5 жыл бұрын

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 жыл бұрын

@@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 жыл бұрын

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 жыл бұрын

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

@graspengineering9249 5 жыл бұрын

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

@gudimallamjothivinodhkumar2394 2 жыл бұрын

What is the natural frequency of centrifugal pump alone?

@graspengineering9249 2 жыл бұрын

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 жыл бұрын

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 жыл бұрын

Thanks for highlighting, Please kindly Check the Description.

@sanaullahansari9884 3 жыл бұрын

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 жыл бұрын

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 жыл бұрын

@@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 жыл бұрын

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

@graspengineering9249 3 жыл бұрын

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 жыл бұрын

@@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 жыл бұрын

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

@shekharhatankar5150 Ай бұрын

How to gotten this step file for practice

@graspengineering9249 23 күн бұрын

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

@Bala92635 Жыл бұрын

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

@graspengineering9249 Жыл бұрын

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

@Bala92635 Жыл бұрын

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

@antonaveendp2896 4 жыл бұрын

Sir can I get the link to download cadd file

@graspengineering9249 4 жыл бұрын

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

@antonaveendp2896 4 жыл бұрын

@@graspengineering9249 OK sir thank you

@akshayjagtap2597 3 жыл бұрын

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 жыл бұрын

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 жыл бұрын

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 жыл бұрын

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

@trikal8949 3 жыл бұрын

@@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 жыл бұрын

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

@graspengineering9249 2 жыл бұрын

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

@limcheehong85 2 жыл бұрын

@@graspengineering9249 Thank you very much😍

@KanwaljeetJaura 3 жыл бұрын

Great explanation! Can you please provide your email id

@graspengineering9249 3 жыл бұрын

Thank you !

@KanwaljeetJaura 3 жыл бұрын

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

@graspengineering9249 3 жыл бұрын

@@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 жыл бұрын

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