# yugang

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1. ## How to simulate collide of 2 mass models in activate

Hello, Suggest there are 2 mass, they locate in one line. But mass_1 at S=0m, while mass_2 at 5m. Now, I apply F=10N force at mass_1, mass_1 starts to move, at 5m, it will meet mass_2. Then this 2 mass should have collide. The speed curve should have a drop. I don't know how to simulate this, whether it is possible in activate with Modelica components. This model is simple, but it is the simplification of our project. If it works, it means the complicated model in our project should also work. Thanks. Have a nice weekend.
2. ## Why cases not works in math expression block

Thanks for the answers from RoKet and Livio Mariano. I think I make mistake between math expression and matrix expression. The if and switch works well in matrix expression not math. Thanks for your answer, I think RoKet's solution is normal one. And the one from Livio Mariano is very tricky and interesting. Have a nice day.
3. ## Why cases not works in math expression block

Hello, I try to creat a math expression block, with cases function. I follow excately the example in extend defintion document. But I don't understand why it not works. For example, there is a sin waveform generator. Output 1 when signal >0, output -1 when signal <0. Can anyone takes a look and help. Thanks. Case.scm
4. ## How to ignore the solver error during batching solving

I spend more time to optimize my model. To make sure no solver error while simulation. In this way, now it works quite well.
5. ## Errors of activate during simulation

During simulation of multi-physics, encounter this error. Can anyone helps me how to solve this, thanks.
6. ## How to ignore the solver error during batching solving

Hello, Thanks for your reply. Yes, I have read your post, and follow excatlly the same way as shown in the topics. I will add try catch loop into my master script. If any progress, or interesting finding, I will add here. Have a nice day.
7. ## How to ignore the solver error during batching solving

Hello, How to ignore the solver error during batching solving ? When we use activate during batching solving, if there is solver error, the simulation will be stopped. It is a pity. How can turn off this error warning, and ignore this error, continue to solve in next step, not stop here? Because if we have 5000 batch solving steps. one error in it, it is OK, during our result analyze, we can remove this point. But in simulation, if it stops here, it take our time to watch the solving and not automatically.
8. ## Issue of Flux coupled with Activate

Hello, These days, I work with Flux coupled with Activate for simulation of contactor dynamic behavior. The contactor has 2 coils, 3 switches. The 3 switch is controlled by activate. While the current of the 2 coils are used as sensor input for Activate. But when I start the simulation, at beginning the current in the coil seems reasonable. But after 5ms, or like this, the current and voltage on the coil starts to become very strange, and non-meaning, just noisy points, I don’t under stand why. I think, the activate only control the switch and do some control, very simple, the Flux finish FEM calculation. When I work with Flux alone, same calculation performed, no noisy points. For solver I use same as tutorial showed for activate and Flux coupling simulation. I hope I can get some help for this topic. Thanks. Activate_couple_Flux_simulation.docx
9. ## Activate coupled with Flux issue

Hello, These days, I work with Flux coupled with Activate for simulation of contactor dynamic behavior. The contactor has 2 coils, 3 switches. The 3 switch is controlled by activate. While the current of the 2 coils are used as sensor input for Activate. But when I start the simulation, at beginning the current in the coil seems reasonable. But after 5ms, or like this, the current and voltage on the coil starts to become very strange, and non-meaning, just noisy points, I don’t under stand why. I think, the activate only control the switch and do some control, very simple, the Flux finish FEM calculation. When I work with Flux alone, same calculation performed, no noisy points. For solver I use Forward Euler same as tutorial showed for activate and Flux coupling simulation. The attached document has some picture to make my issue more clear. I hope I can get some help for this topic. Thanks. Activate_couple_Flux_simulation.docx
10. ## Compiler required to use Modelica with Activate

Yes, I have the same issue of this. And I click on the SDK option. then I solve this issue. Hope it can help you. I install 2019, you need make some choice when you starts to install.
11. ## error id 760

Hello, this is my file, thanks for the help. 20181026_YG_0000.out 20181026_YG_0000.rad actuator.hm

13. ## error id 760 for radioss model

Hello, I am new user of hyper mesh. I encounter a error when I ran radioss. The error id is 760 It says I add solid property to shell elements. But in my model, there is no shell elements. Is it due to my mesh method ? I mesh the surface first and then use solid map mesh. The orginal file is attached as below. Please review it. Thanks. 20181026_YG_0000.rad actuator.hm 20181026_YG_0000.out