I am trying to solve a simple contact with just three parts that are glued together. As soon as the solve starts I got the following error message and the solve is terminated:
Fatal Error Message:
*** USER FATAL MESSAGE 6198 (MPYAD)
…
I have an airplane and have done a gust response analysis - for a discrete vertical gust. I used the nastran example from chapter 9 section 1. How can I do a side gust analysis - gust 90 degree angle to gravity vector? Can you point me to an example.
I am performing frequency response on a large model. For a set of grid points, I want the response of every grid point due to unit forcing at each grid point dof. In the past, I have set up DLOAD cases for each unit force, but I then discovered that FRF…
Currently I received "LOGIC ERROR IN SUBROUTINE ACMS1D" and "LOGIC ERROR IN SUBROUTINE ACMS1D". Any idea what is to do to avoid this ? Using Nastran 2017.1 and ACMS=New
Are the FGCNST and FGCTST stiffness values that the user must input in units of lb/in such as a simple spring, or are they in units of psi such as for solid material.
I have to run a lot files SOL111 for a big model. I want to keep modal database calculated with SOL103 for example, to run efficiently and fast SOL 111/112. I can not see in the documentation something specific for that. I tried to use the restart commands…
I know about the DMAP CRDB_IN and CRDB_OUT and CRDB_DBK to get various matrices out. How does one use these (or another method) to get ASET information out in the HDF5 database?
The answer below works to extract the matrices. Is there a reference…
I am trying to solve for contact solution. I have defined contact pairs instead of using contact table format. I have defined three load steps that are needed to be run cumulative. I have licensing only for SOL600. So, when I tried to setup the job for…
I am building a model that has bolted joints. I have created three load steps (Perload, Fix & External Load). I am trying to run it on SOL600 for the first time as I have to do it in steps. When the solution type is choosen as Implicit Non-Linear (SOL600…
I have tried to find if there is any option in Meshing-->Create Mesh/Element. But, I didn't find anything useful. The only thing I found on 1D elements is how to crated CBAR elements.
Currently I am trying the Monte Carlo Method in SOL111 for acoustics. Mass. stiffness or damping matrices would be varied separately or in combination. I wonder if it is possible to get some backward information concerning the mass, damping or stiffness…
I have defined a PBUSH element. The idea is to constrain the relative motion in one direction. I have defined a very high stiffness in that direction to make sure there won't be any relative displacement between two ends of the beam element. Now, I would…
How do I create *.iges or *.stl file using SOL200 topology optimization results?
I need the geometry file for 3D printing with the optimization results. But, in Patran, converting 3D meshes(optimization results) into geometry seems to be impossible…
Even though I have a valid installation of Microsoft MPI statement PARALLEL=n seems not to be working, although acquiring n number of licences when asked.
Hello,
I got a following fatal message in SOL 400 when I was running MSC.Nastran V2018.0.1.
*** SYSTEM FATAL MESSAGE 4276 (UNPACK)
ERROR CODE 31 PID= 0
*** USER INFORMATION MESSAGE 4276 (UNPACK)
THE DIAG 44 RELATED A NASTRAN…
I have applied pressure though a cavity. I need to output Element forces so that I can capture X,Y & Z force components on the surface where I have applied pressure. I went through Nastran documentation but I am not sure what should I request output for…
How to do the Bolt preload analysis using 3D bolt model and and 1D beam. Out of SOL101 and SOL400 which one is preferred for the Bolt preload analysis ?
I want to define a temperature set for structure analysis based on a heat transfer. According to Quick reference guide in 2017, TSTRU can use in sol SOL101, SOL106 and SOL153. Can I use TSTRU case in SOL400 ?
If TSTRU can use, what parameter should…
Hi
I defined the Nodal temperatures (SOL 101)
I would like to know, is it possible to extract the nodal temperatures from OP2 file using Patran or any other post processor.
Thanks
Prasad
It is a SOL106 problem and I tried NLPARM card with FSTRESS default value 0.2 and the convergence stopped at 70%. I tried FSTRESS with value 0.99 and it converged to 90%. Actually I wanted to use RIKS method( Arc length method), but since there were…
I have a 2 mass and 2 spring system which has test response specified in DABLED1. I would like to find spring stiffneses to match the test result. How to define the objective function in such case?
Attached Files (1)
opt_fresp_02.dat
Hi, I am carrying out FEM checks like GROUND , Epsilon, max ratio, external work checks. I am looking for an simple worked example to know how Nastran calculates above values.
The force (may not be a equal) being applied at the links end and both the links are connected by an intermediate link via revolute joint.
In the result the large rotational displacement being observed which results very less stress. Please someone…
