The two grid points should be coincident and have parallel cartesian coordinate systems. A detailed description of the nx nastran grid point weight generator. As of march 21, 2018, weve stopped selling autodesk nastran software to new customers in a standalone offering. At this point that is the only command that can be selected. Converts fem models created by femap, patran, ideas to the standard una input file. Using the bdf interface, you can readeditwrite nastran geometry without worrying about field formatting. This output clearly shows if the total force on a particular grid is balanced or not. See section 4, support for export of adams mnf file in sol 400.
Rotordynamics users guide msc nastran 2016 mafiadoc. Please submit new posts to the highlyinteractive msc community here. The asterisk at the end of each line means that dof was internally constrained to avoid singularities. Map temperature for thermal structural analysis in msc. This can either cause set conflicts in the gp4 module, or unintended constraints to ground. Msc nastran, patran tutorial freebody loads, pinned truss.
A nastran primer for the analysis of rotating flexible blades charles lawrence, robert a. In an effort to streamline the experience and deliver more value to our customers, the functionality is now available in autodesk nastran incad. Examples of such loadings include the edge load on a cquad4 element or a pressure load on one of the faces of a solid element. It also provides users with the contribution and transfer of the forces in the structures. How should the assignment to test software for a vehicles vcu be aproached.
This is useful for verifying free body behavior through zerosum values for all force and moment components about any node. Type cd patran you need to do this for each session. For problems in basic coordinates, the grid requirement drops to 8 x number of grids. Thebeamselementxaxiswillbeparalleltothebasicsystemsxaxisby ourchoiceofx1,x2,andx3x,y,andz. The union of all the coordinate systems defined on all the cd fields on all the grid entries is called the global coordinate system in msc. Computing method of forces on rivet ion dima corresponding author. All computers but vax an avoidance is to use an explicit set of grid points on the spc1 card, rather than on the thru option. The sfd code uses relative displacements and velocities, x, y, x, y between these two grid points as the input and outputs the forces fx x, y. Full text of fullycoupled fluidstructure vibration analysis using mscnastran see other formats nasa technical memorandum 110215 fullycoupled fluid structure vibration analysis using mscnastran christian m. Your purchase, license, receipt or use of the softwrae constitutes your acceptance of all the right to use license. Grid point force balance and element strain energy in nonlinear static analysis, 715.
Sporadic use of advanced finite element analysis fea software, such as nonlinear analysis by design. The grid point stress gpstress option in msc nastran offers you another alternative. Nastran books, xii s technical support, xiii s internet resources, xv s permission to copy and distribute msc documentation, xvii 1 nastran command and input data s introduction, 2 s nastran command, 7 s the nastran statement optional, 8 s file management. Fernholz the george washington university, joint institute for advancement of flight sciences, hampton, virginia jay h. Our platform provides visibility into facility operations, and enables tools to help customers automate and control sites, lower energy spend, and proactively manage daytoday operations. Patran is the worlds most widely used prepostprocessing software for finite element analysis fea, providing solid modeling, meshing, analysis setup and postprocessing for multiple solvers including msc nastran, marc, abaqus, lsdyna, ansys, and pamcrash.
The purpose of these linear statics test cases is to verify the function of the nx nastran software. Software corporation 2 macarthur place santa ana, ca 92707 usa telephone. A weightless rectangular beam spans 40 inches and is loaded with a vertical downward force w 18. Location of the grid point in coordinate system cp.
Gpforce all option definition type default print grid point thermal gradient and heat flux will be output to both the model results output file and the results neutral file system. The grid points are defined in a local rectangular coordinate system, which is. A verification procedure for mscnastran finite element models. There is no need to modify the adams model there is no need to change your processes export job can be triggered at any operating point export job is a high fidelity translation accurate kinematics matching eigenvalues static cases. The terms of the agreement under which you are acquiring the right to use the software include the right to use license attached hereto or accompanying the software. The output coordinate system that user specify in the cd field for a particular grid point is the coordinate system used to apply the constraints, solve for the displacements,degrees of freedom, some applied loads, solution vectors and output the results associated with that grid. Generally, the nastran patran software is used for the modeling of the aircraft. Again, if you lump these loads equally to the grid points, the lumped load at each node is p4 for the chexa with eight nodes and cpenta with six nodes, and p8 for the chexa with 20 nodes and cpenta with 15. As time went on, niche features that were needed e. Calculation of unit mass of beam shell by using patran or. In 1993, we could calculate grid points anywhere in the world, but we couldnt plot them on a digital map until around 2000. Differential stiffness and follower force stiffness in linear and nonlinear solution sequences, 677 buckling analysis enhancement, 679 nonlinear transient response analysis, 691 performance improvements in sol 129, 707 nonlinear analysis with superelements, 715 grid point force balance and element strain energy in nonlinear static.
This program was originally developed by msc software. A cid of zero references the basic coordinate system. Defines the location of a geometric grid point, the directions of its displacement, and its permanent single point constraints. The pynastran software interfaces to nastrans complicated input and output files. Mechanism type of singularity that requires the consideration of stiffness terms of more than one grid point. Sort2 is output presented as a tabular listing of load, frequency or time for each grid point. Identification number of coordinate system in which the displacements, degrees of freedom, constraints, and solution vectors are all defined at the grid point. This is done by adding the line gpforceall to the case control. You can do it in nastran using the grid point weight generator option. Fullycoupled fluidstructure vibration analysis using mscnastran christian m. By default it is used to define the geometry of structure. However, it should serve as a starting point for finding necessary information in msc product. Patran beginners guide arul m britto april 15, 2005 contents 1 introduction 3. However, it should serve as a starting point for finding necessary information in msc product documentation.
The element positive normal is in the direction of the zaxis of the basic coordinate system. To use it you must request that patran calculate the grid point force balance at all of the nodes in the model. Identification number of coordinate system in which the location of the grid point is defined. Sort1 is a tabular listing of grid points for each load, frequency, eigenvalue, or time. Patran is the worlds most widely used pre postprocessing software for finite element analysis fea, providing solid modeling, meshing, analysis setup and postprocessing for multiple solvers including msc nastran, marc, abaqus, lsdyna, ansys, and pamcrash. The grid point force balance table is the data around which all fbdforces and resultant force and moment utility calculations are performed. Powered by the best data, gridpoint is validated in over 12,000 locations.
We are looking at the crosssection and assume is very long thick such that z strain is essentially zero therefore we make the plane strain assumption and mesh with 2d solids. In finite element analysis, the loads are often applied to the elements rather than to the grid points. Sort1 is a tabular listing of grid points for each load, frequency, eigenvalue, or time, depending on the solution sequence. The latest version of the program can be downloaded for pcs running windows xp7810, 32bit. These checks are performed before the mass matrix is converted from weight units to mass units.
Integer 0 required cp identification number of coordinate system in which the location of the grid point is defined. Calculation of unit mass of beam shell by using patran or nastran. All of the content in this blog post has been directly extracted from chapter 9 of the msc nastran 2012 linear static analysis users guide. Nastran cbush element orientation stress ebook llc. The fe solver provides you with keywords, much the same way that software provides you with apis. A load p is to be applied evenly as an outward pressure load pa to a surface of each of the four solid elements shown in figure 928. Msc nastran, patran tutorial linear statics, principal. Beyond hdf5 support in the bdf, im a huge fan of the new ability to keep track of which include file a card came from and write it as a separate file. A nastran primer for the analysis of rotating flexible blades. Msc nastran, patran tutorial normal modes, point masses and. This is useful for generating interface, section cut, or freebody loads and tabulating them in a userfriendly format. Msc nastran, patran tutorial freebody loads, pinned truss analysis. Grid point force data recovery, that is calculated by the solver, provides some very useful output that helps to determine load paths through the structure.
From the patran programs point of view units doesnt mean anything all numerical entries. Ive been looking into patrans freebody functionalities, but maybe it would be easier just to extract nodal loads from the grid point force. Please submit new posts to the highlyinteractive msc community here search simcompanion. Patran is a pre and post processing package for the nite element program abaqus. In msc nastran, gpforce output is used to provide the value of force at the grid points. This output clearly shows if the total force on a particular grid is. In the solver browser right click on global options. Top 10 reasons for patran customers to upgrade to femap developing exceptional products that meet strict quality and performance criteria cannot be left to chance. Character plot grid point force balance will be output only to the results neutral file system. If you have a temperature field which is defined by a point at the centroid of every element, it would be a reasonable assumption that the grid points of these elements all have the same temperature as the centroid i. Nastran users guide preface about this book, xii list of msc.
If the patran interface is being used, make sure there are no. Or, you can click on the vector button, and then define the vector in the vector locate dialog box as shown above using various methods such as. The grid point stresses are called out by the gpstress command, which points to set 10, which, in turn, points to surfaces 100 and 200. Making sense of fea node grid point stresses msc software. For complex data, you can output real, imaginary or phase, etc. By default, the grid point stresses are transformed to the basic coordinate system. There is no need to modify the adams model there is no need to change your processes export job can be triggered at any operating point export job is a high fidelity translation accurate kinematics matching eigenvalues static cases only 5262011 7.
We are transitioning to a newandimproved community collaboration platform. In 1989, i began working with bruce and in 1993 we released the first version of gridpoint atlas, our software which calculates harmonics and calculates the world grid. Software gmbh am moosfeld 81829 munich, germany telephone. Singularities cause illconditioned matrices that can be detected in four different phases of the mscnastran execution as follows. Gridpoint is a smart buildings technology company that makes site optimization simple. Making sense of fea node grid point stresses msc nastran. After matrix assembly, the grid point singularities are detected. You do not have to select elements or grid points as the accel will be for the entire model. Direct transient analysis using nastran kfourmetrics. Analyze the model with mscnastran making sure to select grid point force balance as part of the output. Patran has a postprocessing tool in the results module for creating freebody plots from nastran results data.
Apr 24, 2017 simple beam analysis basic beam simulation with nastran solver in nx siemens 10. It is a good idea to restart patran in the directory in which the database resides. As you can see, consistent loads are functions of the element types and applied loads. The goal is not to replace a code like patran or femap, but instead complement it.
Force sid g cid f n1 n2 n3 field contents sid loadsetidentificationnumber. Find the principal stresses at points a, b, c, b and a. This is done by adding the line gpforceall to the case control section of the nastran deck. Swap the signs of the grid point forces to use the force applied to the element at the node, rather than the force appl ied to the node by the ele ment which is the default. Optionally, select a coordinate system into which the grid point force and moment result vectors are transformed and output. Field definition type default id grid point identification number. Note that grid points were located at the point of application of the load and. This site is now readonly for the purposes of search and browse. Linear static analysis of a simplysupported truss kit scc. You can download this new product release at the msc software solutions download center under msc nastran 2018 folder.
Many checks are also performed to verify that your model is correct. Additional tools include time animations,streamlines, grid point force balance,free body diagrams with easy data selection for. Patran tutorial linear statics, principal stress and stress transformation duration. Top 10 reasons for patran customers to upgrade to femap. Point forces are applied at grid points 2, 4, and 6. This section includes a description of all known errors and general limitations in all releases of msc. Here grid i represents a point on the damper journal rotor and grid j is a point on the housing stator. Load sets must be selected in the case control section load sid. Fullycoupled fluidstructure vibration analysis using msc. Patran does not prompt for a thickness, and will insert a thickness of 1. Full text of fullycoupled fluidstructure vibration.
It is provided to be a supplement to a university course in fea or to establish a foundation for a research project. Robinson langley research center, hampton, virginia january 1996 national aeronautics and space administration langley research center. The programs installer file is commonly found as patran. This output must be requested from the solver for the node sets of interest.
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