Frequency Response Analysis using Hypermesh [Optistruct Tutorial]

[@ankitshende6636]

Hello @Aeroswap.....Here why u choose direct freq and not modal fre. Resp..........keep going......this is the channel which I follow for cae only

[@Aeroswap]

Hi Ankit, These are two separate methods to perform a frequency response analysis (direct and modal). Both provide accurate results. However, there is difference in the solving strategy used in both methods. Modal frequency response takes less time to solve in most cases. I will be creating a tutorial about modal frequency response analysis soon. Good to know you follow the content posted here :)

[@muhammadaliabid5793]

@@Aeroswap Dear Swapnil Looking forward to your tutorial on Modal Frequency Response Analysis ! Thanks in advance

[@amitdeshmukh9660]

Sir where have you gone.No latest vedio.It would be amazing you also put tutorial for ansys.your narrations are too good and easy to understand. currently not learning hypermesh ,but kept subscribe to your channel so i dont loose your cotent and channel name in future when i am about to learn.Thank you.

[@Aeroswap]

Hi Amit, Thanks! I'm glad you like the content posted here. I have been very busy with some other work, hence, the big delay in posting a new tutorial. Don't worry though! I will be posting a new video during this week. Thanks for checking in, it means a lot :)

[@venkatvj7741]

Hi.. Can you please do acoustic modal analysis of an impedance tube? Thank You.

[@sudarshan945]

I am using HYPERMESH 2013 where do I get this curve editor

[@Aeroswap]

Hi Sudarshan, Older versions of Hypermesh work differently. There is no 'Curve' entity in HM 2013. Create a new loadcollector and set its card image to 'TABLED1'. Now in the NUM field, enter desired number of input rows. You can enter the tabular data after that. I hope this information helps!

[@fly-above-sky4735]

2019 version shortcut keys are not working..how to enable it.? Please tell me ...thank you so much for your videos

[@Aeroswap]

Hi Aravind, Please reset all Hypermesh settings to their default values to revert any unwanted changes that might have happened while using the application. This will resolve the issue.

[@fly-above-sky4735]

@@Aeroswap ok thank you..I'll try 👍

[@fly-above-sky4735]

@@Aeroswap I tried..but exactly I don't know how to do. I'm trying in Preference option..there how to do ..I don't know.. please tell me

[@fly-above-sky4735]

@@Aeroswap while Im pressing functions key ,it's not performing for Hypermesh.. usual function wrk only happening

[@Aeroswap]

Delete all temporary files from Documents folder which are related to Altair applications. Then open the application again and see if it works.

[@yagnemanilreddy4298]

how to change curve data as tabled data in lower versions of HM like v19

[@Aeroswap]

Hi Yagnem, in lower versions of HM, TABLED card image is for loadcollectors. Not for curves.

[@gllyprakash412]

I didn't get this point as we are applying unit load on the node specified how come that small amount of load is sufficient to excite the model to its natural frequency i.e., the peaks in the graph which are 450Hz and 680Hz

[@Aeroswap]

Good question! The main function of unit load is to provide a location and direction for the vibrational loading. I said unit load as we are specifying the scale factor for DAREA as 1. By changing this scale factor value, we can adjust the amplitude of vibrations as per our requirements, One thing to be noted is that regardless of the amplitude of vibrations (scale factor), the peak frequency on the graph will remain the same. The maximum deformation value will change but the frequency at which this deformation occurs will remain constant. I hope this information answers your query!

[@gllyprakash412]

@@Aeroswap can we consider those peaks as resonant frequencies.

[@lovenesstvlogs]

helo there i'm have hyperwork Version 13 but in that Radioss or anyother solver not installed can you guide me how to proceed to download that

[@edvevinaykumar1488]

how to view max stress

[@muizzjamal8871]

Hello sir! I'm getting an error "frequency response load case 1 has all zero loading vectors - check DAREA input data" Please tell what am I doing wrong?

[@Aeroswap]

When you create the DAREA constraint, you have to make sure that the scale factor is 1. By default, the value will be 0 and that will cause this error. You can update the value to 1 to resolve this issue.

[@muizzjamal8871]

@@Aeroswap Sir should I change the scale factor value for all DOF? I changed the value for the one in which my part will translate but I am still getting the error. Please guide.

[@Aeroswap]

The method shown in this video is tried and tested multiple times. It works properly. Please make sure that you are following every step in the tutorial as is. It should work then!

[@girishs6943]

Hi, What happens if RBE3 is used insted of RBE2 as response point??

[@shubham22kar]

Can you help me out in how to assign a half sine curve??

[@Aeroswap]

Hi Shubham, The method for defining any curve is same, through the table editor. If you increase the number of data points, you will achieve a smooth curve as required.

[@lokeshbiradar8415]

sir is there any classes conducting online ? ( optistruct )

[@Aeroswap]

Hi Lokesh, As of now, I do not conduct any online trainings. But you can gain a lot of knowledge about Optistruct usage by watching the videos posted on this channel. Feel free to contact me if you face any difficulties while learning.

[@udaypatel8341]

how to analyse a component for shock loading in optistruct, shock load is 30g for 11 milisecond

[@illustrationsbyrajaram9474]

Well done

[@manmohanmp]

Could you tell what is the purpose of DAREA, RLOAD2 and FREQi ?

[@ravindermuppdi7839]

do you use ansa aswell, need some videos in it tooo......ansa is more advanced than hm

[@Aeroswap]

Hi Ravinder, Most of my work involves Hypermesh. As my primary expertise is HM and not Ansa, I will not be posting Ansa tutorials on this channel. Hope you understand.

[@youtubeking6743]

Sir I am getting a error during optistruct likke "" A fatal error has occured in your model. Please refer to the .out file to obtain more information on how to correct it "" kindly help me with this error

[@Aeroswap]

Hi Dinesh, Please check the OUT file for this analysis which will be saved in the folder where you saved the model before launching the solver. In the OUT file, the exact error message will be listed. This will be useful to make appropriate changes to the model to resolve the error.

[@atharvakate5165]

Can u make a video on fatigue analysis using both E-N and S-N parameters

[@Aeroswap]

Thanks for the suggestion. I will work on these topics soon!

[@prithvirajkokkula5794]

Bro . this is awesome . Love it . Can you make a video on Fatigue Analysis using HyperLife . Also do you have online classes that i can join ? I wanna learn more about Such analysis .

[@Aeroswap]

Thanks! Glad you liked the tutorial. I am working on a fatigue analysis video! Hopefully, it will be ready soon. No, unfortunately, I do not take any online classes as of now. But if I do in the future, you will get to know about it on this channel :)

[@atharvakate5165]

Is there any website from where I can get the problem statements and practice more

[@muhammadaliabid5793]

As you mentioned 'We can query the points on the graph to check the values of frequency and corresponding displacement of the master node' , I could not be able to find the results like you did here using query option in older version of HM ! I am using HM 2020 though! Could you please highlight how to do this in older version please. Thanks pl.

[@rohitkadam8560]

Hello sir, I'm learning so can you suggest any books for starters?

[@Aeroswap]

Hi Rohit, The choice of literature to read varies depending upon the topic of your interest. Whether you want to learn the FEM fundamentals or want a general overview and practical usage guidelines, several books are available in the market.

[@sivadasbalakrishnan5711]

Thank you for the video. Why are we updating the scale factor as 1 only In DOF 2? Is it because the loading is in that direction ?why not in DOF 1 and 3 as well ?

[@Aeroswap]

Hi Sivadas, Yes, we are updating only DOF 2 as the load needs to be applied in that direction. You can select any number of DOFs as per your requirement.

[@sivadasbalakrishnan5711]

@@Aeroswap thank you !

[@allonmessenberg3129]

I started watching this tutorial after watching your introduction videos, hoping that this series would be the next step but unfortunately the jump is too large. Is there another series that bridges this gap? Coming from ANSYS, it is unclear to me why Load Collectors are added instead of boundary conditions being directly applied. Also, what are these cards and how do I learn what each card is used for? In ANSYS I can create named selections and apply meshes/connections/loads/BC to them. Can this be done in HW? It also seems like there is no way to go through the mesh operations and modify them. When a mesh feature is created, that's it. You can't add/deduct a model feature to which it is applied and you can't tweak a setting, you have to reselect and remesh. Is this how it is? Can you please direct me to video tutorials that will prepare me for this current series? Thanks.

[@Aeroswap]

Hi Allon, Thank you for pointing out the difficulties faced in understanding how the solver deck setup works in Hyperworks. I will make sure to create a detailed tutorial regarding boundary conditions setup and editing. As for mesh, it is possible to edit the mesh features once it is created. In fact, you can also add multiple configurations of the same part with different mesh settings in the same model and select which configuration to use in any particular case. I am yet to cover these advanced topics in my videos. Thanks a lot for your suggestion. I will work on these topics soon! For now, I think the Hyperworks Help documentation will help you a lot in terms of understanding how the analysis is set up and why certain control cards/load types are used in specfic cases.

[@allonmessenberg3129]

@@Aeroswap OK I'm back. I was able to follow this time. Can you please explain how I would find/plot the maximum stress and/or displacement either in the entire model or in a specific component per frequency instead of selecting a single node and plotting its data? I want to know which frequencies result in the largest stresses and then I want to know where those stresses occur. Thanks.

[@muhammadaliabid5793]

Dear Swapnil! Since we can perform coupled thermal structural topology optimization. Is it possible to couple frequency response analysis results with thermal structural analysis and then perform topology optimization?

[@Aeroswap]

Hi Ali, Not sure if we can couple frequency response with thermal analysis but frequency response based optimization is definitely possible!

[@muhammadaliabid5793]

@@Aeroswap Thanks a lot for your quick reply!

[@kenkim2687]

Nicely performed the direct freq analysis using the specified range of the frequency as an input. How difficult is to do the modal base freq analysis though? Do I need to run a modal analysis first and import it to the model as an input? Or can I run them all at the same time? By the way the new Hyperworks 2021 looks pretty neat. I'm still using 2017 haha.

[@Aeroswap]

Hey Ken, thanks! No need to run a modal analysis separately. We can set up a modal frequency response simultaneously in the same model. It solves much faster than direct frequency response. I will be creating a follow up to this video to demonstrate the modal based frequency response analysis. Yes, the new interface is great! Much easier to use than legacy HM. I hope your company decided to switch to the new interface soon :)

[@ravindermuppdi7839]

@@Aeroswap Waiting for modal frequency response analysis video.. thank you for the information

[@Aeroswap]

Working on it. Hopefully it will be out soon! Make sure to keep the notifications turned on to get latest video updates instantly :)

[@PrithviRaj-mj2du]

@@Aeroswap I am waiting on it too . Notifications turned on .

[@PARTHESUNDSEC]

@@Aeroswap when sir?

[@mamleshbohari2200]

Nice work man ... can u suggest of any projects from website or books in hypermesh that I can work upon to build a project portfolio ?

[@muttuhugar5846]

Can you please help me out how to get maximum stress and displacement at a once. Instead of checking all the loads I want it automatically. Do you have any suggestions?

[@Aeroswap]

I did not understand your question. Can you please elaborate? If you are talking about frequency response analysis, we are getting the maximum values from the graph. No need to do anything else!

[@muttuhugar5846]

@@Aeroswap For modal frequency response analysis I am having around 40 loads ( Frequencies). For all the 40 loads I am getting different stress and displacement. Currently I am looking into each load for noting the values and taking the plots. Instead I want maximum stress and displacement among those 40 loads at a once. I want these data from hyperview. Can you please provide me your contact number. So that I can explain in detail about my query. Thanks in advance

[@Aeroswap]

Hi Muttu, Once you plot the graph, you are getting all the results in one frame. The graph lists stress values at each frequency so you can easily observe the maximum stress value and its corresponding frequency. If you still have doubts regarding this, feel free to contact me via email. My email address is provided in the 'About' section of this channel.

[@muttuhugar5846]

@@Aeroswap okay. Thank you very much.

[@ayyappajammula730]

@@muttuhugar5846 Hi muttu if we have multiple loadcases we can create derived load case(envelope) on hyperview by combining all loadases into a single case..

[@dhanvindhsoundar2656]

Hi! I come from an aerodesign student team. We use Hypermesh and hyperworks for multiple analysis. After watching this video I had a few queries related to what we're working on. Is there any possible way that I can contact you?

[@Aeroswap]

Hey! Sure, you can contact me by sending an email. My email address is provided in the 'About' section of this channel.

[@emmanuelvassilakis5630]

Nice!

[@Aeroswap]

Thank you :)