# Intan

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1. ## Additive Manufacturing Constraints in Topology Optimisation

Hi @Prakash Pagadala I'm integrating the overhang constraint in my design variable for the topological optimization. However there are certain fields that I don't quite understand the definition. For one, from the guide, the Point Selection 1 and 2 define the grid point identification numbers which identify the orientation. What orientation does it refer to? Is it the built orientation? Thank you and regards, Intan
2. ## Direct Transient Dynamic Analysis Problem

Hi @Prakash Pagadala, I've tried superposition in derived load step but apparently it is only for linear problems. My problem is a transient one. Regards.

4. ## Additive Manufacturing Constraints in Topology Optimisation

Hi, Is there anyway to integrate Additive Manufacturing constraints for topology optimization in optistruct? I would like to add constraints such as maximum overhang angle, minimum number of support structure, etc... I would also like to determine the best build direction. Thank you
5. ## Direct Transient Dynamic Analysis Problem

Hi I have a connecting rod that is subjected to two loads, Tensile (Admission phase) and Compression (Combustion phase). Both loads have TLOAD2 as their card image and hence each of them have their own loadstep. When observing the results, i would like to see both loadsteps one after another eg: t1 : Combustion , t2 : Admission, t3 : Combustion , t4 : Admission...... I have derived both results together but it showed me the combustion results first then after t500 only it will show admission. Is there anyway to correct this? Regards.
6. ## Dynamic Loads Topology Optimisation in Optistruct

Thank you ! I will try this approach. Regards, Intan
7. ## Dynamic Loads Topology Optimisation in Optistruct

Hi @Prakash Pagadala Would you have a suggestion on how can this optimization be carried out? Regards, Intan
8. ## Dynamic Loads Topology Optimisation in Optistruct

Hi @Prakash Pagadala I've sent the model via the transfer link. Thank you!
9. ## Dynamic Loads Topology Optimisation in Optistruct

Hi, The problem consists of a connecting rod submitted to axial loads which define the phases of admission (traction) and combustion (compression). I am trying to run the following optimization: ﻿ 2 load steps : Traction Compression 2 responses : Volume Compliance 1 constraint : 60% Volume 1 objective : Minimize compliance﻿ I managed to run a direct transient analysis for the two separate load cases. I tried running a topology optimization for one of the load cases but an error occured with the following message: *** ERROR # 557 *** DRESP1 2 is not referenced from within a static or an MBD SUBCASE. This type of response must be specified from within a static or an MBD SUBCASE. This error occurs in DESOBJ 2. I would like to know: How can I create alternating load steps to simulate the traction and compression phases If it is possible to run an optimization with these dynamic loads Thank you !
10. ## Topology Optimization in Optistruct - Problem with two loadsteps

Hi @Ivan Thank you so much for your reply! I will try to use the method you mentioned.
11. ## Topology Optimization in Optistruct - Problem with two loadsteps

Hi, The problem consists of a connecting rod submitted to axial loads which define the phases of admission (traction) and combustion (compression). I am trying to run the following optimization: 2 load steps : linear static (traction) linear static (compression) 2 responses : Volume Compliance 1 constraint : 60% Volume 1 objective : minimize compliance Without combining the two load steps, I managed to run the optimization. I couldn't find a way integrating the two load steps for the optimization. I found that the only time that I can include the load step is when I define the objective. However only one load step can be selected. Therefore I was wondering if there is a way to integrate both of the load steps mentioned earlier. Thank you !
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