Freebody result vectors as mentioned earlier, the nastran gpforce. You can do it in nastran using the grid point weight generator option. Major areas of focus in this release include the following. The asterisk at the end of each line means that dof was internally constrained to avoid singularities. Msc nastran, patran tutorial freebody loads, pinned truss. After matrix assembly, the grid point singularities are detected. Examination of the grid point singularity output below shows that dof 3456. Click on ok when the new model preference form appears. 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.
Design and analysis of main landing gear structure of a transport aircraft and fatigue life estimation for the critical lug 25 fig i. Now, a point mass can be defined on this 3d grid point which will be treated as part of the rotor during the analysis. 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. An advanced overview of freebodies in femap this guide provides an indepth overview of freebodies in femap. It also provides users with the contribution and transfer of the forces in the structures. For problems in basic coordinates, the grid requirement drops to 8 x number of grids. 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.
Nx nastran basic can play a key role in your virtual product development process by providing the most. Gridpoint is a smart buildings technology company that makes site optimization simple. These checks are performed before the mass matrix is converted from weight units to mass units. Gpforcealll fem should be listed now under output requests. Defines a static load at a grid point by specifying a vector. The static load applied to grid point g is given by. Results for this particular case are shown in figure 315. An inhouse tool was developed to generate the geometry of a patran model, using a few straightforward inputs from the user. Analyze the model with mscnastran making sure to select grid point force balance as part of the output.
These loads are nodal loads that satisfy the grid point force balance from all elements connected to that node. Freebodies cannot be made without requested the necessary data from the solver run. Field definition type default sid load set identification number. This site is now readonly for the purposes of search and browse. There are also grid point forces that can be written out using the gpforce case control cards print option in nastran. Set identification number of a previously appearing set command. Software corporation 2 macarthur place santa ana, ca 92707 usa telephone.
Nastran users guide preface about this book, xii list of msc. Top 10 reasons for patran customers to upgrade to femap the following items represent the main technical and commercial reasons for investing in femap,and upgrading from patran to femap, and clearly show why femap is the leader for cae products in many markets including aerospace,defense,heavy industry and shipbuilding. It turns out that the applied load at a node equals the summation of the 4 internal forces such that. Type cd patran you need to do this for each session. Furthermore, the set of elements in the surface definition must also include elements 5, 6, 8, and 9. 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. Software sales and support value added reseller providing software, training. Patran probably has something equivalent, but the nastran output is guaranteed to be consistent with the. 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. Output from the inhouse tool is a session file containing pcl patran command language. Grid point force balance 20 oes stresses at grid points from the curv module 21 oes straincurvature at grid points 22 oelof1 element internal forces and moments 23 oelop1 summation of element oriented forces on adjacent elements 24 oep element pressures 25 oef composite failure indices 26 ogs grid point stresses surface 27 ogs grid point. Case study tlg aerospace, llc making better aircraft everyday case study.
Software gmbh am moosfeld 81829 munich, germany telephone. Load sets must be selected in the case control section load sid. There are no units in patran, and therefore it is important to stay consistent in units. Monitor points for element results and grid point forces.
A pinned joint truss is loaded with a force at one end and one of the components is heated uniformly to an. Find the principal stresses at points a, b, c, b and a. Femap and nx nastran applied cax nx software, training. Thus, the basic equation for finite element analysis is 0. This guide provides an indepth overview of freebodies in femap. Element force and grid point force reaction force, temperature and heat flux real and complex dynamic results sort2 results nastran mass and stiffness matrices. To use it you must request that patran calculate the grid point force balance at all of the nodes in the model.
The una software is used for analysis of metal, nonmetal and multilayered composite structures. The grid point force balance reveals 4 internal forces from each surrounding element for any given node and an applied load there for pressure that i put on the tube. Converts fem models created by femap, patran, ideas to the standard una input file. Shinjuku first west 8f 237 nishi shinjuku 1chome, shinjukuku tokyo 1600023. Patran has a postprocessing tool in the results module for creating freebody plots from nastran results data. This 3d grid point is connected to a point on the axisymmetric rotor using rbax3d entry. Other enhancements include grid point force balance output, topology and topometry optimization enhancements, rotordynamics enhancements, and external superelements in sol 400. Top 10 reasons for patran customers to upgrade to femap.
By default, the grid point stresses are transformed to the basic coordinate system. It is a good idea to restart patran in the directory in which the database resides. A verification procedure for mscnastran finite element models. Please submit new posts to the highlyinteractive msc community here search simcompanion. Tlg aerospace sample static aeroelastic load condition. The solver solves the problem and the results are obtained from msc patran. The session file is then run from a command line in order to generate a bulk data file and a patran database.
The software will be updated later in the year after i finish a book i am writing. Rotordynamics users guide msc nastran 2016 mafiadoc. Msc nastran, patran tutorial freebody loads, pinned truss analysis. Making sense of fea node grid point stresses msc nastran. This is done by adding the line gpforceall to the case control section of the nastran deck. Character plot grid point force balance will be output only to the results neutral file system.
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. Nastrans grid point force balance table shows the forces and moments acting on the grid point from each source element. Note that all loads for the 2d solid should be inplane edge loads. These checks are performed before the mass matrix is. Femap engineering science analysis manufacturing and design. Siemens digital industries software siemens plm community. Patran does not prompt for a thickness, and will insert a thickness of 1. Real required n1, n2, n3 load vector components of. In my example output set id is defined manually in line. Initially the model is created in the catia v5 software as shown in fig. At each grid point a 3x3 partition of the stiffness matrix corresponding to the three translational and three rotational dofs is solved as an eigenvalue problem to determine the principal stiffnesses. This can either cause set conflicts in the gp4 module, or unintended constraints to ground. 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. If you would like to see the breakdown of each particular step and get a better understanding of freebodies, view the accompanying webinar hosted by russ hilley.
Fullycoupled fluidstructure vibration analysis using msc. Design and analysis of main landing gear structure of a transport aircraft and fatigue life estimation for the critical lug 22. Manage and edit schedules at individual sites, regionally, or across an entire enterprise. Only grid points whose identification numbers appear on this set will be included in the grid point force balance. In the model shown in figure 925, if grid point stresses are requested for grid point 11, then element stresses must be requested for a set that includes at least elements 5, 6, 8, and 9. Powered by the best data, gridpoint is validated in over 12,000 locations.
A simple model may have only a handful of grid points. The purpose of this blog is to point engineers and students likewise some helpful tips and resources in aiding them to use this tool. Grid point weight generator gpwg oload resultant user information message 3035 for manual inertia relief only. Calculation of unit mass of beam shell by using patran or. This allows a user to use the interactive and color capabilities of patran to view eal re,suits. A cid of zero references the basic coordinate system. To request it, you must enable force balance in the femap nastran output requests dialog. Femap freebody deepdive patrick kriengsiri, femap development. Permanent single point constraints associated with the grid point. Discuss topics of finite element analysis on the aircraft industry environment. The model is prepared and meshed in preprocessor software patran as shown in.
Siemens and the siemens logo are registered trademarks of. Other enhancements include grid point force balance output, topology and topometry optimization enhancements, rotordynamics enhancements, and external superelements in. Intended to display a balanced set of loads on a discrete piece of. The element positive normal is in the direction of the zaxis of the basic coordinate system. The following is a brief summary of the program capabilities element library rod, bar, beam, membrane, plates and shells tria and quad, shear, solids, spring, mass. Unfortunately, corner output is only available starting with version 67. Here is an example how to get applied gp forces for selected nodes vectors 172 t1, 173 t2 and 174 t3. To find the output, search for g r i d p o i n t f o r c e b a l a n c e with the. Application of bearing load in msc patran 2011 mitch greenberg, fractureproof research. Free body diagrams and grid point force balance output time and frequency domain animations complete access to results data is provided through the data table pane, which you can use to gather, sort and control the amount and type of data that is visible to quickly and efficiently compile an analysis report. Design and analysis of landing gear lug attachment in an. The data is then aggregated into gridpoints software platform, gridpoint energy manager, where stateoftheart iot applications are applied to maximize building efficiency and energy reduction. Node or vector as we can see from the image above, you can use a node to define the vector, the vector direction is then from grid point ga to the node. A weightless rectangular beam spans 40 inches and is loaded with a vertical downward force w 18.
Ofcourse, it is assumed that engineers who make use of this are aware of basic finite element method basics of msc nastran and its applications. Grid point force balance will be output only to the results neutral file system. This output must be requested from the solver for the node sets of interest. Similarly, we also have the plate element bending and twisting moments. Msc nastran is one of the premiere structural analysis program, wellknown and wellestablished in the cae field. If the edge grid point is connected to a quad4 element, then requesting corner output resolves this problem. Location of the grid point in coordinate system cp. The performance of the nastran data translator is regularly monitored for continuous improvement. This option reads an l01 file and writes stress, strain, temperature, force, and deformation data to patran results files. A grid point is a point on or in the structural continuum which is used to define a finite element. Analysis manager master requests and conditions nastran output requests force balance. Ensure you select grid point force balance in results selection, through global data, output requests.
Additional tools include time animations,streamlines, grid point force balance,free body diagrams with easy data selection for. Identification number of coordinate system in which the displacements, degrees of freedom, constraints, and solution vectors are defined at the grid point. The companion to this volume is the uainastran users reference manual. Enhanced grid point force display gpforce in msc nastran, gpforce output is used to provide the value of force at the grid points. The pynastran software interfaces to nastrans complicated input and output files. Free body diagrams and grid point force balance output time and frequency domain animations complete access to results data is provided through the data table pane, which you can use to gather, sort and control the amount and type of data that is visible, to compile an analysis report. A verification procedure for mscnastran finite element. This output clearly shows if the total force on a particular grid is balanced or not. Shinjuku first west 8f 237 nishi shinjuku 1chome, shinjukuku. Grid point force balance and element strain energy in nonlinear static analysis, 715.
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. Integer 0 required cid coordinate system identification number. Msc nastran, patran tutorial linear statics, principal. The grid point force balance table is the data around which all fbdforces and resultant force and moment utility calculations are performed. Grid point force balance for all grid points will be output. Please submit new posts to the highlyinteractive msc community here. Msc software is pleased to announce the latest release of patran 2018 with new enhancements that are designed to improve user productivity.
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