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Found 5 results

  1. Hello, I have a question about the new function topology optimization with lattice: Can the lattice density be variable? I saw that I can set the bounds of density where to put the lattice structure, but has it all the same structure? or can the lattice structure be variable with the density? Thanks
  2. Hello, I'm searching for an easy way to implement the following constraint for a group of design variables in an optimization study within the Hyperstudy interface. Let's assume we have the variables A, B, and C wich should be varied within the following ranges: A: Lower Bound: 0, Upper Bound: 1, Initial Value: 0.33 B: Lower Bound: 0, Upper Bound: 1, Initial Value: 0.33 C: Lower Bound: 0, Upper Bound: 1, Initial Value: 0.33 Whereas the general constraint A+B+C<=1 musn't be violated. My approach using the function "Link Variables" did not lead to an appropriate result. I would like to avoid a redefinition of the parameters within the solver input file (i.e. by A = A/(A+B+C), in consideration of the explicit assignment between the parameters defined by Hyperstudy and the "real" parameters used within the solver. Does anybody know of an convenient way to implement the constraints as described? Thank you for your efforts in advance. Cheers, Felix
  3. Submitted by ParryKestrel on Mon, 07/16/2012 - 20:59 I was wondering if someone can tell me the difference between these variable definitions. One has the variable with the output connector and the other is with the output connector removed. I have a simulation that runs fine however, when I begin removing the output connectors on variable definitions to clean up it begins to fail. It fails with the error "Connection Loop". I have seen the other forum post on that error and installed the most updated version available on the website. I am using V7.0A. I am curious as to how there is any difference at all between the definitions. Please see the image. http://imgur.com/ZPPIn Also similarly, I am in the habit of removing the large black arrow when I use a defined variable. I remove the arrow since it is already defined and there is no need for inputing a signal into an already defined variable. When I do this am I altering the variable somehow? Vissim Variable definition error.bmp
  4. Submitted by rboelloeni on Tue, 12/04/2012 - 05:19 Is there a way to import non time based data into VisSim to populate variables in a model.
  5. Submitted by Enric on Wed, 05/25/2011 - 15:11 I had a question regarding a model which I am trying to create: please note I am quite new to Vissim. I am trying to model the level of a solute in the blood using a mass-transfer model. The model is defined by a number of compartments, with mass flow occurring between them and a number of integration functions, plus "unknown" constants which define the rates of mass flows between compartments. To create the model I have guessed these “unknown” constants and now the model is up and running. What I want to do is to “optimise” these constants to produce a model where the blood level most closely matches real, measured, values. Please could you give me some guidance on this. I have two initial questions: Obviously there a variable called “time” which ticks upwards as the model progresses. How can I access this variable to display another variable at a set time point (to compare to my actual values). ie. An operator which would allow the following function: WHEN time=x1 seconds, THEN display variable X. When time=x2 seconds, THEN display variable X. If I could do this, then I could perform the most simple form of optimisation by comparing variables visually ! In addition, being able to do this would give me a set of readings at set time points which I could use for optimisation. In my relatively simple model, which produces in the end a single output (solute concentration), how can I devise a system that optimises the solute concentration curve against actual measured levels that I have at discrete time points ? I am not sure if I should be using the Cost function here. Any guidance on this would be appreciated- and thanks. I'm not after someone doing the model for me, its more that I'm still getting to grips with what functions are available for this.
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