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Found 4 results

1. ## Difference in mass, size optimization

Dear optistruct users, I have a question regarding the sizing optimization. Currently I am performing a size optimization of a truss structure. The model consists of lines which are meshed into Cbeam elements and design variables are generated in order to perform a size optimization. The design is subjected to multiple load cases. The objective of the optimization is to minimize the mass of the structure. Constraints are defined for the member stresses and displacements. The optimization works fine. When I calculate the mass of the structure by using tools --> mass calculation, I obtain a mass of 2.056 ton with a volume of 2.620 * 10^8 mm^3. I have used the standard steel material properties (Rho=7.85 * 10^-9 mm^3). I have defined point masses which are defined in a separate compnent with a total mass of 1.245 ton. When I look at the first iteration step (iteration 0) in the output file. I see that the mass is equal to 2.358 Ton and that the volume is equal to 1.42394*10^8 mm^3. This confuses me. So to make it clear: Before first iteration step: Mass= 2.056 Ton Output file, Iteration zero: Mass = 2.358 - 1.245 = 1.13 ton I understand that the masses of the point masses are incorporated into this mass. But why is the volume changed of the design? On the internet I found the following written about this difference, but it is still not clear for me. Do I make a mistake, how should I interpret these masses? Can someone make this clear for me? Regards, Michael
2. ## What's the difference between the two system creation method

What's the difference between the two methods to create a local system? In the system panel, there exists two methods: one is create by axis direction, the other is create by node reference. I want to know the difference. Thank you.
3. ## Difference Heat maps with many antennas

Hi all, Please advise if there is a way in which I can obtain difference heat maps for more than 1 antenna in the prediction rectangle. for Example, firstly load 4 antennas into the prediction rectangle using Edit --> Combine data --> Max value. Then, subtract this combined heat map with another combined heat map with 4 antennas which were already loaded using Edit --> Subtract --> Value (File, Linear) . So Its basically 4 antennas - 4 antennas. Is it possible in ProMan. Please advise Thanks Have a great day Balaji
4. ## Difference for setting temperature constraint

Hello everyone I would like to know, what is the difference between creating a constraint, set its Card Image to TEMPD, set T1 with the temperature and to create 'temperatures' and set the value to the temperature? I thank you in advance for your help!
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