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Terje Rølvåg
Norway
Приєднався 6 січ 2017
I will post NX and FEDEM training videos on this channel with a special focus on how to prepare FE models for real time Digital Twin applications. You will also find new playlists dedicated to my new courses at NTNU and OsloMet. These are called "Digital twin Technologies for Condition and Structural health Monitoring"
Digital Twin based Condition Monitoring of Rotor System
This video demonstrates how rotor dynamics can be simulated in the time domain applicable to Digital Twin based Condition Monitoring. Both physical (Bently Nevada RK4) and virtual testing (FEDEM/Non-linear FEA) are demonstrated and compared wrt. to axial deflections, hot spot stresses and bearing loads. A high speed Photron camera is used to visualize the radial deformations of the rotor axis at critical speeds. The selection of sampling rates in physical and virtual tests are discussed
Переглядів: 694
Відео
Digital Twin supported Structural Health Monitoring
Переглядів 846Рік тому
This video uses a physical cantilever beam mounted on a Kongsberg shaker and a Photron high speed camera to visualize its structural behavior at resonance frequencies. Sine sweep functions are used to trigger the first 3 eigenmodes between 5 and 120 Hz. A FEDEM Digital Twin (DT) model is then validated and used to simulate the physical test. Virtual strain gages on the DT model is providing str...
ASME 2022 OMAE Promotion Video
Переглядів 3762 роки тому
This is a promotion video for me and Øystein Strandens paper DIGITAL TWIN BASED STRUCTURAL HEALTH MONITORING OF OFFSHORE CRANE. The paper will be presented at the ASME 2022 OMAE conference in June 5-10, 2022, Hamburg, Germany
Mola Exercise Video
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This video presents how Modal analysis of a Digital Twin (FE model) can help you identify defects on a Physical Twin (real asset). The asset in this exercise is a physical Bridge model assembled with MOLA Kit No. 3 (thanks to MOLA for their support)
Real Time Digital Twin based Structural Health Monitoring
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This video describes how to model, setup and run a Digital Twin for Structural Health Monitoring of a real physical offshore crane. The digital twin is simulating physical crane operations based on outputs from the crane sensors sent from an IoT gateway to a cloud solution. The cloud sensor data is filtered and read by a FEDEM digital twin that replicates the physical crane motions. The simulat...
IoT/Digital Twin presentation at the 36th International CAE Conference
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This video is a short teaser to an AHT Tools project presentation given by my me and Kjell Bengtsson (Jotna AS) at the 36th International CAE Conference 2020 (www.caeconference.com/). The presentation demonstrates how ISO 10303 (AP209) has been extended to include all date needed to transfer and store Digital Twin data (CAD, FEM, KINEMATICS, SENSORS etc). The new AP209 technology has been appli...
Welcome to Finite Element Applications in Mechanical Engineering (FEAinME)
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It's a pleasure to welcome you to FEAinME. The teaching facilities are brand new and so are the lecture notes (theory) and multiple choice tests.
FEDEM simulation of Harley Davidson Softtail with 113cc S&S engine (0-60mph simulation)
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This video shows a Softtail with 113cc S&S engine accelerating from 0-60mph in 4 seconds (the original does it in 4.8 seconds). Both bike setups are simulated with all structural and mechanical components represented by a mix of FEMs, lumped masses, springs, dampers, tires etc to give correct mass and stiffness distribution and reliable results. Please also take a look at the stress animation (...
FEDEM simulation of Harley Davidson Softtail with 113cc S&S Motor
Переглядів 6586 років тому
This video is showing the VonMises stresses during (the first second) of an acceleration from 0-60 mph in 4 seconds. The FEDEM model is representing a Softtail Custom 1987 frame equipt with a 113cc S&S engine. Additional parts like engine, gearbox, tires, fork, axles are modeled to ensure an optimal force and mass/stiffness distribution. Additional tank, saddle, driver, handle bar masses are in...
Jack Recall - FEAinME Physical Test
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The students used FEDEM and NX to predict the failure modes for a 1.5 tons electric jack that was recalled from the Norwegian market (it is still for sale in US!). This short video shows a physical test where the jack was loaded with 1.5 tons and run to a lower position! (the jack has more failure modes than shown here ...)
NX SOL 601 Nonlinear FEA (Geometry)
Переглядів 7 тис.6 років тому
In this video you will learn how to setup and run a Nonlinear Geometry simulation in SOL 601 demonstrating how large deformations and follower loads can effect the tangential stiffness. This is the third of 3 videos giving an introduction to Nonlinear FEA. In the two other videos I demonstrate nonlinear Materials and Contact.
NX SOL 601 Nonlinear FEA (Contacts)
Переглядів 8 тис.6 років тому
In this video you will learn how to setup and run a Nonlinear Contact simulation in SOL 601 demonstrating how contacts (nonlinear boundary conditions) can effect the tangential stiffness. This is the second of 3 videos giving an introduction to Nonlinear FEA. In the two other videos I demonstrate nonlinear Materials and Geometry (large deflections and follower loads)
NX SOL 601 Nonlinear FEA (Materials)
Переглядів 3,5 тис.6 років тому
In this video you will learn how to setup and run a Nonlinear Material simulation in SOL 601 demonstrating plasticity and it's effect on the tangential stiffness. This is the first of 3 videos giving an introduction to Nonlinear FEA.The next two videos will demonstrate nonlinear Contacts and Geometry (large deflections and follower loads)
Digital Twins for Structural Health Monitoring and Predictive Maintenance
Переглядів 8 тис.6 років тому
This video demonstrates real industrial digital twin applications that will be used as benchmarks for future PhDs. They represent current state of art in Digital Twins for digital inspection of structural integrity. The instrumentation of the physical assets are financially supported by SAP and Fedem Technology AS. The digital twins are created in FEDEM by NTNU/MTP master students
NX B&W 602 idealization and meshing
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NX B&W 602 idealization and meshing
Thank you for the video. Can we use a revit model instead of a cad model (wanted to do the shm for a building against an earthquake)
great job!
Great video! I'm doing my PhD about Digital Twins and I want to focus in dynamics, Is it possible to get the FEDEM software?, I'm Universitat Politecnica de Catalunya (UPC) Student.
Sorry for the late respons but the answer is yes. It has been integrated in the SAP IoT CP package but now (this weak) it will be released as Open Source software available to anyone free of charge
Great job!
Thank You Professor for this informative video.
Hi, I don't know if you see this comment since your last videos 8 months ago but I'd like to thanks to your videos especially FEAinME. I hope you'll continue to share more videos, these videos are so valuable for people who want to develop his/her knowledge. Thank you so much again.
Thanks for your nice and inspiring words. I have changed my position at the university and thats why I haven’t made new FEAinME videos. However, I am now preparing a new course called Digital Twin Technology (for Structural Health Monitoring) and will make new videos demonstrating various technologies and methods
@@FedemDigitalTwins I will be waiting for your new videos, thank you again :)
Hello, How the data from the sensors mounted on the physical model is being implied on the digital model. Would be really helpful of you could help. Thanks in advance
The sensors on the physical crane are not replicated on the digital twin. They are standard Palfinger instruments not directly applicable as input drivers on the crane. There are ex. two angular sensor outputs that I translates to equivalent tilt cylinder strokes (driven actuators in the FEDEM model). The cylinders are modelled according to the cylinder property specs to get the correct input loads and stiffness. The overall boom length is measured on the physical crane and these are translated to individual telescopic cylinder strokes. These is also one measurement of the crane slewing angle and vertical wave motions that are used directly as input to the crane simulation (after low pass filtering in Python)
@@FedemDigitalTwins Appreciate your time, but can we simulate the exact working condition on the digital model? For example if we are creating a digital twin of an elevator door , can the sliding movement of the physical elevator door be represented in the digital model aswell?
@@mrrohan6396 Shure, are you thinking of a kinematic, rigid body or a flexible body dynamic analysis? In FEDEM I can run a real time flexible body analysis (FEA) since the software uses CMS model reduction (super elemements) It could be a perfect solver for your elevator door!
@@FedemDigitalTwins If I give a input of say 10mm sliding movement of the elevator, can this be achieved in software? And can I vary the distance of the sliding movement?
@@mrrohan6396 , no problem
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do you have any tutorial with acoustics BEM?
Sorry I don't. Even though I am quite interested in acoustics (HiFi freak), I have never performed such analysis, which NX solver do you use for those type of analysis?
@@FedemDigitalTwins I want to simulate a horn, but I never did it
@@MrMauro1984 Probably not the easiest thing to do, the excitations might be difficult to model
Hi, its a nice tutorials. I have a query, can we idealize tiny faces by selecting them on the basis of area and then deleting them?
Shure, but only when NX is able to close the open patch after the tiny surfaces have been removed (when sewed). There are some NX commands that automatically fix such problems, especially the idealized part geometry
Do you know how i can display more than the 10 fisrt modes?
You specify the number of modes in the Lanczhos setup under the solution menu
can you simulate highly viscous fluid in a thin shear?
A=432 Hz is a myth “I don’t know what’s the matter with people: they don’t learn by understanding; they learn by some other way-by rote, or something.” ― Richard Feynman
Hi, I have a gripper that pick up an object in Motion simulation. Then I use Pre/Post and Loads Transfer to observe in FEM. Basically it's just normal FE model. However, I can't see Reaction forces in the result (I made it once, but I didn't save and the following tries later I can't see it anymore). I already request Output for Force and SPC Force but it still doesn't show. Which can be the possible mistake I made that prevent Reaction force to be plotted? Thank you Loc
thank you very much.
thank you very much for your contribution. you are my teacher ^^.
Thanks Uesak, I am happy to contribute ;-)
you have any book of example so i can make practice from it. If have than please send it on my email ID or share link.
Sorry I haven't but check out the NAFEMS books
Hi, Can we create hyperelastic material in Nx Nastran?
Shure, but I have not tested it. Both SOL 106 and 601 should handle hyperelastic materials (large deformations/strains)
Thank you for the video, it is quite explanatory and helpful. However, I am a bit confused with the way you extract the damping ratio at w2. At first, you get the damping ratio using the log decrement on a response vs time graph. I am fine with that but how did you end up with the damping ratio at w2 ? Am i missing a point there? Thanks
I would like to study there!
Fredy Andres Mercado Navarro, Welcome Fredy 👍
Thank you for demonstrating the set up.
Hi, can you send me model part file? my email : newax03@gmail.com
Hi terje. Very nice video. Thanks for sharing your knowledge with us. I have a doubt with the same that can you tell me that while conducting a buckling analysis which boundary conditions you have applied.
Hey hi terje. I am facing a doubt while assigning a enforced motion. I am using 10.0 version and am not able to specify time step while applying enforced motion . Can you please guide me
Terrific presentation, perfect tempo thanks a lot, sir
Hey, which version of NX are you running? I've tried this example on 12.0.2.9 and it does update the geometry automatically after you close excel. However, you still have to run the last simulation to update the eigenvalues.
You're right about that, I used the first version of NX12
Hi Terje Rølvåg, This is a great video. Can you send me the model part file (or .step file) or download link. Thank you very much, man.
My e-mail is tunahanaydogan1@gmail.com
You should have it now ;-)
Thank you a lot man
ramazansevim@gmail.com
Hi Ramazan, If you send me your mail adress I can send the CAD parts to you
@@FedemDigitalTwins ramazansevim@gmail.com
Can i have the model part
when you applied the force to the coordinate system, how is that point connected to any nodes?
If I remember right I used a RBE2 element
@@FedemDigitalTwins Got it. I don't think you showed that step (setting up your FEM) in your video, however, it was very useful. thank you. Can you make a video on formulated loads on a surface?
how to get this 3d model
This URL below has a link to the 3D models in the book. community dot sw dot siemens dot com/s/article/nx-cae-book-engineering-analysis-with-nx-advanced-simulation
When I press solve in the first example i get the following Solver Input File Error: Specified NASTRAN inpup file is invalid: C\Program Files\Siemens\NX 11.0\UGII\model1_sim1-solution_1.dat any idea what the problem is? I followed the instructions exactly.
Shure, youre model file is stored in a NX installation folder with limited write access. Another problem might be the long path+file name that cause trouble for the NASTRAN solver (Fortran issues). Put the model file on a local drive with all rights and a short path name (Don't put it on the Desktop either!)
Thank you for your upload. I got a good help for buckling simulation using NX.
Great Video! Thank you. It is not clear for me, why the stiffnes increase double ?
PLEASE WATCH MY SPRING <ua-cam.com/video/phWO2Fha2Zg/v-deo.html>
great example of multiple NX feature all in one video and very well presented. May want to include a bit of explanation about some of the feature which are sequence dependant such as mapped 3-d mesh of edge brackets base 1st before the yoke.
Hi terje I have a problem durning sumulation ,Can you share your email id , so i send you a model
Sure, my email is shown in the videos terje.rolvag@ntnu.no
hi terje hope you receive my mail
Thank you very much for your Tutorial!!! It really helps a lot to understand NX SIMCENTER! Do you have example for nonlinear analysis with rubber material and the part has Surface to surface contact with itself? (e.g.like Hyperelastic Gasket or rubber around shift gear lever)
Sorry Thomas, a collegue of mine is the expert on rubber, composites etc. He is making videos but he is also an Abaqus fan ;-)
Helped a lot !!! Thanks
Can you share NX rotor dynamic analysis tutorial and campbell diagram creating?
and thank you for all videos sir
Thanks, I will look at it
danke
Prof, Is there any link to download excel sheet?
No, but I can mail it to you (if you send a mail to terje.rolvag@ntnu.no )
Greetings good sir, if you display the von misses stresses and set the result to average nodal combination in the 3d mesh simulation (tetra10), you get the 60 MPa calculated analytically. Does this mean the 3d mesh simulation is not that far off from the correct result or is it just a coincidence?
Nice job. Below another examplo of Virtual Sensor: ua-cam.com/video/8qX3UIhojHk/v-deo.html
Great video thanks! Can you please tell me what the other 9 modes are for please?
Or where I can get any info on them please. Thanks
Nice video. But, actually after some time I started to prefer working on simplified 2D models in concept/early design phase. It saves a lot of time - for example adding a rib is just like 3 operations in Modelling and 2 in Pre/Post.
Sure, I guess if the redesign only involves changing thicknesses and adding ribs, 2D models are most efficient. I guess that's best practice in aerospace and civil engineering. However at our department we are mostly dealing with product development / design and then 3D models are usually the preference
Hi, thanks for the video. I am doing FRF using SOL 111. I am having trouble defining my load and damping as a function of frequency. I would appreciate any help. I have posted my complete query in NX Nastran discussion forum: community.plm.automation.siemens.com/t5/3D-Simulation-NX-Nastran-Forum/SOL-111-FRF-Problem-in-defining-load-and-damping-as-a-function/m-p/462467#M2552 Thanks.
I will start teaching FRFs in my course FEAinME next month and then I'll see if I can look into your problem
Terje Rølvåg Thanks, also I was curious how you defined loading in SOl 109 and 112. Is it simply load defines as magnitude and direction or is it defined similar to how you defined in SOL 103 RS using new event and half sine wave function.
Hi, Can you do a video on finding the frequency response function using SOL 108 or SOL 111. I couldn't find any tutorial on it on internet. They have few but it's for FeMap and not NX. I would appreciate if you can make one or suggest me a reference of any available tutorial on NX nastran FRF. Thanks.
I will make a try next month
Hi, I have one question, I want to do a free modal analysis of a drone without constraints. I get the results in SOL 103, but when I include a static subcase because of surface contacts and bolt pretension in my model, I do not get results. It only gives results when I constraint the model. Is it possible to get results in this case without defining the constraints in the model as I want to simulate the drone in mid-air where there is no motion constraints.
Hi, it is possible to setup subcases in a solution with different (local not global) constraints. A static analysis will require contraints as you have noticed while a modal analysis can do without due to the use of the shift factor that allow you to calculate free free modes. It is also possible to add (rigid body) constraints to your free free analysis without messing up the modes.
Hi, Thanks for the reply. I just wanted to ask one more thing whether applying constraints to the body should change the modes and natural frequency that I am getting from doing the modal analysis without adding constraints. I got some difference in natural frequencies and mode shaped in the above two cases. Are those results correct, should the natural frequency and mode shapes not suppose to be independent of the constraint conditions in the modal. Thanks for sharing the knowledge.
You must check if your solution is based on local or global constraints. Local shall only be applied to the active solution