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Substantial differentiation matrix
Hello, I am trying to understand better what the Nastran solutions are actually doing in the background, and upon studying the aeroelastic solution I learned that the matrix of aerodynamic influence is formed by: [Qkk] = [Skj] * [Ajj]^(-1) * [D1JK + i*k*D2JK] While I understand the... -
Do Bolts Transfer Compression Loads?
You are right that the bolt will not carry compression, but it is under shear. The orange plate is deforming for extension and the blue plate is deforming for compression, in that intersection, so both bolts will also have a shear force if you isolate them. In a more general case, I don't...- lusosa
- Post #27
- Forum: Aircraft engineering
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Creating a temporary matrix in a DMAP ALTER
I am trying to create an alter where I generate a matrix and do something local and temporary with it. What I am doing right now looks like this: MATGEN ,/TEMP/2/N ADD TEMP,/X/3.0 Notice that X is a matrix already in the NDDL, but TEMP is not, it is something that I created temporarily for this... -
Getting a deeper understanding of NASTRAN
@dmapguru I am just finishing reading the 'Getting Started' guide, and while it is nice to have everything laid out in an organized way, I don't think it introduced me to anything particularly new. And yes, I am at the point trying to write some DMAP Alters. I am also (generally) familiar with... -
Do finite elements have to be planar?
For those who don't seem to be understanding, OP is asking if he can define the four grids of a quadrilateral element in a non-planar way, i.e., the plane formed by three of those grids does not contain the fourth point. It can, but it is very very very bad practice, probably will create all...- lusosa
- Post #5
- Forum: Finite Element Analysis (FEA) engineering
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ASET cards are not exported from Femap
There is a Siemens: Femap board, maybe your question would be more appropriate there -
Getting a deeper understanding of NASTRAN
Good afternoon (or whatever particular time it may be), I've been using NASTRAN for quite a while now (almost 5 years) and I am fairly familiar with how models are created, the basic logic of the program and I can read the most common bulk data entries. However, I still feel a bit lost about...
