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Found 25 results

  1. Hi, I have two main questions (for now) 1) I have define an advance joints between two bodies and is there a way to define the contact force between these two bodies without using the 3D or 2D contact simulation? 2) what does it mean when i define output-force-body and how can i see the result in hypergraph or hyperview? thanks for the help!
  2. Hi guys, I need your help! I'm simulating the translation of an arm actuated by a pneumatic cylinder (constant force) whose movement is stopped by a limit switch. How can I simulate the limit switch to stop the motion of the translating arm keeping the force acting on the piston (as happens in reality), avoiding the penetration of bodies (see the attached .gif)? I'm not interested in "Collision detection" button, since after this forced has stopped, I want another force to start acting on another body. Thank you all!
  3. Hi, everyone I am a newbie in hpermesh. As you can see in the picture, I have apply the load to the model. But now I want to know how much force I apply that the model will get the specific stress. So the problems I met are: 1. how to make force as response 2. how to add this specific stress (I guess maybe is the static stress=specific value) I don't know if this is possible. Thank you for you any advice. Thank you for your time. (^_^)
  4. Hi, Where to apply pretension force in pretension analysis in Optistruct. ? Middle of the bolt or tightening area or thread starting area? Pls find the image rgds, Arul
  5. In motion view i have plotted my point for suspension but inspite of putting my parameters the force extraction in Newton is greater than my whole body weight, there's something wrong with force extraction. carsusp.mdl
  6. Hi, I have a .csv file with nodes coordinates and forces (x,y,z,Fx,Fy,Fz) that I need to import in HM. I found 2 solutions: Use Field > realize BCs > Create > Forces > Linear Interpolation Both take the .csv file as an input and apply its forces to the model. What are the differences? What should I use? Thanks for the help!
  7. Hi all, I'm doing a dropping simulation and I find the rigid wall force is strange. So I design a simple dropping model for checking. The rigid wall reaction force is also so strange similar to my problem. In the early stage of dropping contact, the rigid wall reaction force is very large, I suspect this large force result. Is it real or due to the rigid wall formulation? Or how to solve this problem? At beginning, the distance between the Box model and the rigid wall is about 4mm, which means there is no initial penetration I think. I have attached my model. The model is very small, it can be solved in minutes. Please help me find out the reason. Thank you. Roy FaceRigidWallPenetration_Example_0000.rad FaceRigidWallPenetration_Example_0001.rad FaceRigidWallPenetration_ExampleT01
  8. Hi all, I want to ask something about force output. I prepared a crash analysis with a pendulum and crashbumper system.(crashboxes,bumper and brackets) If i do this analysis with rigid wall i can see the results with RWALL forces,but my pendulum is in a different shape,so i don't do it with RWALL. Instead, i modeled pendulum with a small thickness and fully rigid.I can do the analysis in this way.But i want to learn that;how i can i get the force output of this crash analysis? (Brackets are not fully rigid,they are constrained with four screw with BC.) Attached picture may be a referance. Thanks in advance.
  9. Hi everyone, I'm seeking for help in a topic which I'm fairly new to. I have a complete running MBD model of an automotive vehicle complete with different loadcases. The model provides forces on all joints and pre-defined points. The question I have is; 1. Is there a way to automatically load the output forces on a joint, into a static FEM-analysis? And some follow-up questions if this is to be true; 2. Can I pre-define the time at which the most relevant forces occur? 3. Can this be automated as well? For example: At a given time x, the combination of forces in 3 joints give the highest combined loadcase, but it is not necessary to be the highest force in one of the joints. This could occur at time x2. This would greatly increase our evaluation process of a frame. Thank you in advance!
  10. Hello Everyone ! I would like to set up a problem on Hypermesh which include around a hundred load cases (in linear static). To automate it, I found a TCL which "allows a simple template to be created to define the loadcases; useful for creating large numbers of static loadcases very quickly and easily" (link) Thanks to a little VBA, I've just succeed in transforming my Excel data base into a readable txt file for this TCL script. And it works. But my problem is this TCL script only applies my forces (and SPC) on the global system. Is there a solution, and how can modify the TCL script so that it can apply my load cases on a specific local system (expressed into the .txt for each load cases) ? If someone can help me to takle this problem, I will be sooo grateful (Because I've never learnt how to program in TCL) Thanks in advance, Best regards, Hervé Archives.zip
  11. In order to compute accurately the force on a part using the virtual works method, the part must be surrounded by air. There can be massive regions or thin regions of vacuum type. Theoretical explanations about virtual work method can be found in the online help: file:///C:/Altair/Flux_12.2/Help/Flux/english/Website/InterpretationDesResultats3DEnergieForceCouple.html?key=results energie torque force
  12. Hello, I am simulating a three point bending test for a composite laminate layup and I would like to find the force require for failure or alternatively a method of obtaining the point at which any specific ply has failed under the application of a specific force? Many thanks, Ahmed Gehad
  13. Hi! How can i convert FORCE in SPCD? i need to apply that force like is an acceleration. Thanks
  14. Hi all, Hopefully a really simple one to solve. I have a simple model, working as a demonstrator. 2 Components, one locked in place whilst the other is driven into it. I have a contact between the two. I need the simulation to terminate when the contact force reaches 100kN. I believe the strategy is /STOP/LSENSOR. Sensor = /Sensor/INTER... TYPE 6. However, I cannot get the simulation to kill at 100kN. Here is the sensor (Fmin = -1, Fmax = 100). ## Sensors ##-------------------------------------------------------------------------------------------------- /SENSOR/INTER/1 SENSOR 1 -1.0 100.0 0.0 The issue seems to be when the simulation starts, the sensor activates. I've run the model without the sensor and it ranges from 0 to 200kN. I have tried varying the numbers but that does not alter the outcome, every attempt begins with sensor being activated. HELP!!!! Many thanks in advance. Andy
  15. Hi everyone, I'm a student in Design & Engineering at Politecnico of Milan and I'm trying out Solidthinking Inspire 2014 for my master thesis, which is on topology optimization applied to product design by designers. Right now I'm trying to optimize an hammer handle, but I've some difficulties in setting the simulation in the right way. The force applied to the head of the hammer during the usage is an impulsive one. I can't find a way to set a force of this type on my model, so I tried to make an approximation: hammer head mass: m = 1 kg impact speed: V = 10 m/s impact time: 1/100 s I've considered an inelastic collision. after some calculation, based on the relation p = m*V I've found out a force F = 1000 N to be applied on the head. My questions are: 1 - Is there a way to set an impact force in Inspire (2014)? Has someone solved a similar problem? 2 - Is mine a valid approximation? The force value doesn't need to be 100% accurate, I just need to know if my procedure is correct or if there's a better way to set the problem in Inspire Thank you in advance
  16. Hello, Since the contact surface is deformed in the current analyses, I would like to use tracking system to obtain the projection of the contact forces on the element surfaces. I could manage to use tracking system for displacement but I could not find a way to use for vectors of contact forces. the toggle A picture of the issue I mentioned, is attached to this message. The swicthed that is written "use tracking system" cannot be activated as shown in the second picture, Thank you for your help in advance.
  17. Hi, I am running a random response analysis and I tried to request the SPC forces by selecting it in the random subcase output section like I did it for a simple frequency response analysis . My question is now how to get SPC forces outputted for a random response analysis in optistruct. Thanks. Jonas
  18. Hi, I have a solid mesh (tetra elements) and I wish to impose a force load on one of its curved sides. However I want the forces on the nodes to "follow" (i.e. being tangential to) the curvature of the geometry. It this possible? Thank you in advance.
  19. Hi, I am new to Hypermesh and am trying to analyse the load that will be exerted on the airfoil based on the pressure distribution along the airfoil (refer to pic). Is it possible to import these values from the graph into hypermesh?
  20. Hello, i just start to use Tcl script on hypermesh. I've a script who create a simple geometry and mesh on hypermesh. And i need to create boundary conditions. with the commande file I've : *startnotehistorystate {Created Force } *createmark nodes 1 1-19 1920-1945 4553-4559 *loadcreateonentity_curve nodes 1 1 1 -0 -0 50 0 0 50 0 0 0 0 0 *endnotehistorystate {Created Force } The problem is that the nodes are not always the ame (depend on my geometry). Can I create boundary conditions without the number of the nodes ? Like with lines ? Something like : *startnotehistorystate {Created Force } *createmark nodes 1 Line 3 *loadcreateonentity_curve nodes 1 1 1 -0 -0 50 0 0 50 0 0 0 0 0 *endnotehistorystate {Created Force } Thanks Sorry i'm really a beginner with TCL.
  21. Hello Optistruct users, I am attempting to run a topology optimization using dequations as a force constraint. I would like to obtain the reaction forces on a bolt (represented as a CBUSH) and calculate the shear forces on the bolt. The shear forces will be calculated using dequations since we can only obtain reaction forces in DOF 1-6 and shear is needed from both DOF 2 and 3 (in this case). I would then like to use the calculated reaction shear force as a constraint. My trouble is relating the reaction forces to the dequation. How do I reference these forces? I am assuming I will need to reference the node number as well. My other concern is relating the dequation to RESP2. When I try to create a response (using function as my response type) I get the response "a dequation must be selected and edited". I am not sure if this is due to my equation not having referenced any forces with my variables or not. Do I need to create my eqation in Hypermath? Being that the equation I need is already a built in funtion as rss I am thinking I do not need to use Hypermath. Also, if there is a better way to establish the same result I am open to suggestions. Thanks, LP
  22. Hello everyone, i do a FEM Project with HyperMesh and now im at a point where i need some help :/ (First time with HyperMesh) I have to do a FEM analysis where various forces attack a beam. The Problem is that the Beam is not symmetrical but i have to define a Force in direction to the Z-axis. (Picture 2) The Force should attack at the center of gravity otherwise the beam will be twisted. My Question is: Where/ how can i define that point (cog) or force where the beam only bends down and dont twist? previous attempts: Pic 3. --> But it twisted. It is logical because of the lever arm Singe Force on the Top of the beam near the CoG but also twisted My Solver is Optistruct. Pic1. Maybe someone can help me Thanks Pic.2 (Force F has to been define ) Pic 3
  23. Hello, I have a suspension arm with a ball joint modeled in Radioss. My ball joint is modeled as a beam element connected to a zero length SPRING2N with very high translation rigidity and 0 torsional rigidity. I would like to be able to show the reaction force acting in my SPRING2N as a vector to appreciated visually and in one glance its orientation in space. I can use an output block /TH/SPRING to plot the magnitude but this does not provide the orientation. I tried /ANIM/VECT but none of the options seem to offer what I am looking for. I also tried /ANIM/SPRING/FORC, but I can't find "where" this result is plotted (vector, contour?). Any help on how I can do what I want? Thanks
  24. Hi, I'm developing our impact atenuator for an FSAE team based in the crashbox tutorial available by altair. The simulation gone all right but we are having some trouble to generate the graphics.In hypergraph I can't plot the displacement vs force graph, it's shown just a limited number of options in the X type. I want to know how can I generate the displacement vs force graph of the honeycomb or the graph of a point in it. Please, it's urgent.
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