Here are a few articles about implementing an 8pt grid for designers and developers. Esa corp example 3 automatic inertia relief inrel,2. Technical data and computer software clause at dfars 52. Transformation matrix s from the basic coordinate system to. Aug 29, 2011 a detailed description of the nx nastran grid point weight generator. Internally in msc nastran, this time dependent load is accomplished using sload and the celas2 bulk data entries. A pythonbased interface tool for nastrans file formats stevedoyle2pynastran. This release consolidates msc nastran and md nastran into a single solution. To get the total mass use the nx nastran bulk data option param,grdpnt,0 that will cause the grid point weight generator gpwg to be executed taking as the reference point the origin of the basic coordinate system. Nx nastran grid point weight generator tips by structural.
A detailed description of the nx nastran grid point weight generator. Defining grdpnt,0 just switches on the grid point weight generator and keeps the reference point at the default origin. Units of nastran analysis units of nastran analysis aminhed aerospace op 3 apr 12 03. Welcome to msc nastran 2012 msc software is proud to introduce msc nastran 2012. Modal analysis of a computer disk drive i michael g. The following weight and balance information is automatically printed following the execution of the grid point weight generator. Patran provides a rich set of tools that streamline the creation of analysis ready.
Nx nastran basic the core structural analysis fea solver used. Software sites tucows software library shareware cdroms software capsules compilation cdrom images zx spectrum doom level cd featured image all images latest this just in flickr commons occupy wall street flickr cover art usgs maps. The value of wtmass is calculated using the relation. Description type default global mass matrix scaling factor. Jun 16, 2016 the above parameters in msc nastran can help remove singularities in the model and enable the program to obtain a solution. Nastran runs with improperly inserted craigbampton models will show errors. Grid point singularity that is identified by considering the stiffness terms of only one grid point. Msc nastran 2012 dmap programmers guide main index corporate europe asia pacific msc. At the input data the grid point weight generator output request was removed,as well as the generation of the mass matrix. These checks are performed before the mass matrix is converted from weight. For thermal analysis, these generated celas2s produce correct temperatures.
This message occurs since grid ids larger than 00000 are not valid on the grid card and the vugrids have ids greater than 00000. A pythonbased interface tool for nastran s file formats stevedoyle2pynastran. Software sales and support value added reseller providing software, training. Gridpoint is a smart buildings technology company that makes site optimization simple. You can use grid 3 with every type of access, from eye gaze and switch technology to touch and pointing devices. This can either cause set conflicts in the gp4 module, or unintended constraints to ground. Character plot grid point displacements will be output only to the results neutral file system.
The grid point weight generator gpwg is calculated with respect to the grid point grid point weight generator nastran theoretical manual watch online. The same datastructures can also be created by the module cinsa2 which is designed. Grid point weight generator gpwg oload resultant user information message 3035 for manual inertia relief only epsilon strain energy intermediate matrix, qrr total rigid body mass of the structure qrl matrix the resultant of the apparent reaction loads. Grid point weight generator output for enclosed, fixed, and relative. Femap spider nodes video tip by structural mechanics corporation duration. Nastran cards common to all analyses nastran was originally developed by nasa for the space program at the end of the 1960 s. 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. Smc is an authorized reseller of all siemens cae products, learn more at. You can do it in nastran using the grid point weight generator option.
For fluids with free surfaces, the surfaces can move relative to inertial space or to any grid on the structure. After assembling the mass and stiffness matrices, nastran can print out a summary of the structures weight. A verification procedure for mscnastran finite element models. Software corporation 2 macarthur place santa ana, ca 92707 telephone. Altair optistruct continues to grow rapidly as a comprehensive solution for structural analysis and optimization. See autodesk nastran reference guide, section 5, parameters, for more information. For dynamic and nonlinear solution sequences the limit is 214748 grid points. Msc nastran, patran tutorial bending stresses, displacements and free body diagram of a frame duration. Im not sure i fully understand the physical meaning of it. Mesh generation from 3d points with x, y and z coordinates. You do not have to select elements or grid points as the accel will be for the entire model. Integer 0 required cp identification number of coordinate system in which the location of the grid point is defined. Reptile extracts and processes the grid point forces as the force applied to the node by the element, since this is the way that nastran stores the data and the way it is presented in the. The limit is dependent on many factors, one of the most significant factors is the solution sequence.
It defaults to the global origin, but can be should be defined near or at the cg. Nx nastran grid point weight generator nx nastran grid point weight generator chrishadfield aerospace op 17 apr 14 01. Nastran interfacing modules within the integrated c nasa. Gridpoint is a cleantech company that provides energy management and sustainability solutions buzzword for enterprises, government agencies, and utilities gridpoints technology and services include intelligent, realtime control, equipmentlevel submetering and monitoring hardware, big data analytics software and energy management services. Weight, volume element stress, strain, force displacement, rotation, reaction force. The terms of the global mass matrix are multiplied by the value of wtmass when they are generated. Grid point singularities are defined as zero or near zero terms in the stiffness matrix. Nx nastran grid point weight generator aligokce aerospace 0 replies apr 14 apr 14. Read answers by scientists with 10 recommendations from their colleagues to the question asked by arno mayrhofer on jan 25, 2015. For this test we removed the grid point weight generator output request. Patran probably has something equivalent, but the nastran output is guaranteed to be consistent with the. Grid point weight generator, wtmass and superelements it appears nastran is dividing by the wtmass factor once it has assembled the the following example is taken form the nx nastran users guide ref.
The user prepares the fluid model in any preprocessor and writes it out as a. Powered by the best data, gridpoint is validated in over 12,000 locations. Oct 22, 2017 the grid point weight generator gpwg is calculated with respect to the grid point grid point weight generator nastran theoretical manual watch online. Grdpnt pu used in all displacement rigid formats to specify execution of the grid point weight generator gpwg by you. Grid 3 software from smartbox empowers people with disabilities to communicate, control their environment and control their computer. Change the grid point on the gpweight model parameter to one that exists. The model represents either fully enclosed fluids, or fluids with free surfaces. Hydro reads this deck and prepares a series of two or more nastran input decks that generate a model of the fluid. The grid point weight generator is described in detail in reference 6. The reference grid point in the groundcheck command is located too far. Default structural sn curves are available for seam welds and spot welds.
Cyclic symmetry setup in nx nastran claesjohan automotive 0 replies 10 apr 14 10 apr 14. Finite elementmodellingtechniquesin msc nastran andlsdyna. Grdeq pu selects the grid point about which equilibrium will be checked. This option would streamline the computational process.
Nx nastran input file requirements for component solutions. Brief introduction to structural optimization in msc nastran. Many checks are also performed to verify that your model is. A verification procedure for mscnastran finite element. Displacement all option definition type default print grid point displacements will be output to both the model results output file and the results neutral file system. Open vtpasquale opened this issue jan 27, 2019 0 comments.
Typetran at grid points for transient thermal analysis sol 159. These checks are performed before the mass matrix is converted from weight units to mass units. This feature is frequently called the grid point weight generator. Nastran and lsdyna 6 1 finite element modelling techniques and msc.
Rigid body mass matrix mo relative to the reference point in the basic coordinate system. This section includes a description of all known errors and general limitations in all releases of msc. The companion to this volume is the uainastran users reference manual. Using the bdf interface, you can readeditwrite nastran geometry without worrying about field formatting. Yes, the default is 1 which does not execute the grid point weight generator. Patran probably has something equivalent, but the nastran output is guaranteed to be consistent with the model that you actually analysed. Hi every one, quick question, how can i activate the option to generate the grid point weight generator in.
If the opposite sense is desired force applied to element at node, then the flip command line option can be used. Description type default grdpnt 1 will cause the grid point weight generator to be executed. Nx nastran grid point weight generator nastran engtips. Industry aero challenge building a variable buoyancy air vehicle msc software solutions patran and msc nastran to build an fe model and optimize the structure benefits reduced weight. Grid point stress discontinuities volume direct 34 ogs grid point stress discontinuities volume principal 35 ogs grid point stresses plane strain 36 oee element kinetic energy 37 oee element energy loss eigenvalue analysis summary grid point weight generator 54 msc nastran dmap programmers guide table data blocks type chapter 2. The stardyne results for the maximum compression and tension member loads and grid points deflections. Some sweet maths will do the heavy lifting for you. A grid point weight generator reference point was specified that does not exist. Results from these calculations can be compared to the results from nastran, shown in figure 5. I just have a quick question regarding the weight point generator. Femap nondeletable entities video tip by structural. If set to 0 or a specific node id the grid point weight calculation will be performed about the specified point. The grdpnt,0 entry simply requests that the grid point weight generator.
I try to find in the nastran doc how each term is calculated, but didnt find anything. Displacement nastran 2017 autodesk knowledge network. The grid point weight generator gpwg is calculated with respect to the grid point specified in the grdpnt entry. Grid point weight generator gpwg summed about grdpnt origin by default param, grdpnt, 0 5222012. 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. Defines the location of a geometric grid point, the directions of its displacement, and its permanent single point constraints. The default value grdpnt 1 suppresses the computation and output of this data. Thurston hereby grant permission to the wallace memorial library, of r. Hydro reads this deck and prepares a series of two or more nastran. Mar 26, 2018 finite element modelling techniques in msc. The weight response is computed using the same grid point weight generator utility that is used when with the param grdpnt request is used to obtain printed results regarding the weight. This calculation results in a 6x6 mass matrix computed about the grid designated by the grdpnt or about the origin of the basic coordinate system if the grdpnt.
What i have is points in 3d space with x, y and z coordinates you can see it in image 1. Are there any opensource meshing tools for structured. G3027 grid point weight generator reference point id does not exist cause. Comparison of nastran and stardyne static analysis a similar analysis for the same two static load cases as were investigated in the nastran analysis was conducted by fi using the stardyne program. If grdpnt 0 or is not a defined grid point, the reference point is taken as the origin of the basic coordinate system. Hi every one, quick question, how can i activate the option to generate the grid point weight generator in the. Oct 28, 2012 msc nastran, patran tutorial bending stresses, displacements and free body diagram of a frame duration. Supported for nastran linear static sol101 linear static portions of sol 105, 200. I would like that the point is at the bottom right of the grid for each data point. Sixsided solid element with 820 grid points fivesided solid element with 615 grid points foursided solid element with 410 grid points rigid rbar rbe1 rbe2 rrod rtrplt rigid bar element rigid body connected to an arbitrary number of grid points rigid body with independent dofs at a grid point and dependent dofs at an arbitrary number of grid.
Grdpnt and gpweight perform the same function and are essentially interchangeable. Inertia relief in linear static analysis fea software. Only coordinates of the grid points defining the finite element model are known. Any reproduction will not be for commercial use or profit.
Anthony colluraficis post about his sketch workflow is a great guide to getting started. This parameter is used when material density is input in weight instead of mass units. Sound pressure level spl can be output in punch format from a radiated sound radsnd analysis. Field definition type default id grid point identification number. There is a limit on the number of grid points which can be processed by the dbc module for the. As the number of automaker recalls due to software issues are increasing and gaining widespread attention, we are striving to enable the automotive industry. 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. Grdpnt specifies the identification number of the grid point to be used as a reference point. Virtual fluid mfluid mass is included in the mass summary in the grid point weight generator output. Aeros develops revolutionary vehicle buoyancy air vehicle with msc nastran case study.
Figure 323 shows the grid point weight generator output. Looking at the nastran output file, we have a 66 rigid body mass matrix. It does not affect loads generated by grav or rforce bulk data entries or mass properties calculated by the grid point weight generator. Esa corp example 1 manual inertia relief inrel,1 grdpnt,1. Grid generator use the calculator to build a responsive web site your way. Optimizationenabled structural analysis altair optistruct. Note that param,grdpnt is still used in param,inrel,2. I have a line chart which has gridlines showing the data points in the middle of the grid.
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