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  1. 3 likes
    There is not a simple answer to your question. The general guidance is to reduce penetration between components as much as is reasonable, without making the stiffness so high that is results in computation difficulties. Sometimes you need to try different types of normal force calculation, sometimes it's the parameters themselves. In our help section, please read careful the section on Best practices for 3D contacts. Your wheel geometry does not have a uniform mesh, which is important for accurate contact forces. Just search the help for "Best Practices for Running 3D Contact Models in MotionSolve". There is a lot of important material there, that will save you a lot of time and headache if you will follows those best practices in setting up your problem.
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    For your information: I use Hyperworks-X only on .... playstation :-) I work only with classic Hypermesh
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    Hi, First, you are running Real Eigenvalues Analysis using Lanczos solver (EIGRL). V1 and V2 mean the lower and upper bound of your frequency domain. ND means the number of roots (number of eigenvalues) of the following equation : (-w^2*M - K)*phi = 0 with w refers to the real eigenvalue and phi means the eigenvectors. Cheers,
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    There is no specific tutorial for this. You can find the details about our Belt-Pulley tool in our MotionView help: Altair MotionView -> MotionView Panels -> MotionView Toolbars -> Subsystems Toolbar -> Create a Belt-Pulley Subsytem Further questions should be directed to our Multi-body dynamics forum. Note that modeling belt-pulley systems is rather challenging and can be computationally expensive.
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    Dear Fady, is there anywhere I can find some documentation for vssBlockOutputUpdateFlag and similar functions? I still not get the flag paramater meaning. Thanks in advance Orestes
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    Thank you very much, that worked flawlessly. It also answered another question that came up concerning beam section properties which can be found in the utilities as well.
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    I've used pyaudio in the past to create .wav files, which is a package that is able to input/output audio. Steps to install the package: Open the command window (cmd) as Administrator Type cd C:\<Compose_installation_folder>\common\python\python3.5\win64 Type python.exe -m pip install pyaudio There are some examples at GitHub: https://gist.github.com/mabdrabo/8678538 https://gist.github.com/fopina/3cefaed1b2d2d79984ad7894aef39a68 And pyaudio documentation is at https://people.csail.mit.edu/hubert/pyaudio/docs/ - the class stream probably achieves what you are looking for. Regards, Roberta
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    Hi, Go to File > Preferences > Application and turn on "Enable CFD modelling" toggle. This will automatically set the skew as a default quality in volume mesh dialog. Please try this and let me know if you have any difficulty.
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    Hi Amasker, To smooth the curve in HyperStudy, you can use saefilter or polyfit functions available in the Expression builder. You would need to create data sources for each vector Time and Velocity and then create a Response defined with the filter expression. Hope it helps. Let us know if further questions. Diana
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    Hello I modify some things Please copy these modified files and overwrite the old ones If something's wrong, simply backup original files and let me know issuesReports_modified.zip
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    Crashphys - You can't accomplish exactly that, but here's a work-around. Create a DRESP1 with your stress response. Then create a DRESP2 with DEQATN. Pass the stress response and the property thickness (assuming this is a DESVAR) to the DEQATN. I'm not sure if you intend a linear relationship or something else. But your DRESP2/DEQATN could be written such that your stress responses is adjusted for thickness (or some function of thickness). Then constrain that stress with DCONSTR. - Robert
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    Let me add another approach that I've just learned. There are many options to perform it but I’ve found this method very simple, flexible and self-explanatory. Summary: In the example, watertank.oml is the master file. It: changes the input parameters (controller gains) runs (repeatedly) the file Watertank_parm.scm (slave) collects results doing post-processing (plot) at the end. I’ve created a quick video to summarize how to run the demo. Present working directory must be where you save the files (the video shows how to select the pwd). Otherwise use an absolute path in the oml file. Liv ParameterSweeping.mp4 watertank.oml watertank_param.scm
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    Seem that before *feinputwithdata2 you are missing a *createstringarray Number 8 indicates that the array has 8 items If input reader parses 8 args but not found, it's crashed!
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    ... model and video are attached. impulsiveForce_IM.mp4 2_simplified_SingleBC_Impulse_2019.3.stmod
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    Hi forestis - You could use the type "Expression" and have an expression something like this - `STEP(TIME, 1,0,1.1,100)+STEP(TIME,1.1,0,1.2,-100)` In this expression, the first STEP function increases the force to 100 from time 1 sec. until then it is 0. In the next STEP function, the force is being dropped down back to 0.0. (otherwise the force will remain at 100 for the remaining time of the simulation) You may also use a Curve that has the impulse profile of your choice and use TIME as the independent variable while using the type Curve. regards praful
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    Hello @BG913 I guess "hm_gettiedentities" is you are looking for. Ex: *createmark nodes 1 248; hm_gettiedentities nodes elems 1 2; hm_getmark elems 2; Thanks, Imoto
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    @Joel Rodarte: use command "hm_getvolumeofsolid"
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    Hey Hyperman! Thanks for your effort, you understand me well. I was lame and did not leave the z0 offset blank, I left there a 0 mm value. Thanks again, you are the real hero, not superman.
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    Hi, with the setting Z0=blank, the plies will be arranged symmetrically, i.e. half the laminate thickness on both sides of the surface geometry (see image attached). Or have I misunderstood what you are trying to do? composite_laminate_edit.hm
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    Hi Widget pathname of that menu is .model._pw._fbr.content.frmTreeArea.frmTree._m But from v14, it doesn't come in a static way (depends on what you click on) so if you add a menu item then it will be cleared before pop up. To hook an item just before the menu pops up, thanks to Tk mechanism providing <<MenuSelect>> event. This is a way I used in menuexportdeck script: proc ::nexpd::p_Initialize {} { set BindScript [bind Menu <<MenuSelect>>] if {![string match *::nexpd::p_HookMenu* $BindScript]} { bind Menu <<MenuSelect>> {+after idle [list ::nexpd::p_HookMenu %W]} } } proc ::nexpd::p_HookMenu {menuName} { if {![winfo exists $menuName]} return if {[string equal Menu [winfo class $menuName]]} { if {[string match .model*.frmTreeArea.frmTree.* $menuName]} { set menuParent [winfo parent $menuName] while {![string equal TreeCtrl [winfo class $menuParent]]} { set menuName $menuParent set menuParent [winfo parent $menuName] if {![string equal Menu [winfo class $menuName]]} return } set Hooked 0 set Count [$menuName index end] for {set i 0} {$i<=$Count} {incr i} { if {[lsearch -exact {cascade command} [$menuName type $i]]!=-1&&[string equal "Export Deck" [$menuName entrycget $i -label]]} { set Hooked 1 break } } set Selection [$menuParent selection get] if {[llength $Selection]} { if {!$Hooked} { if {![winfo exists $menuName.exportdeck]} { menu $menuName.exportdeck -tearoff 0 -activebackground [$menuName cget -activebackground] \ -activeforeground [$menuName cget -activeforeground] \ -background [$menuName cget -background] \ -foreground [$menuName cget -foreground] $menuName.exportdeck add command -label "Only Selected" -command [list ::nexpd::p_ExportSelection $menuParent $Selection 0] $menuName.exportdeck add command -label "With References" -command [list ::nexpd::p_ExportSelection $menuParent $Selection 7] $menuName.exportdeck add command -label "Save Geometry" -command [list ::nexpd::p_ExportSelection $menuParent $Selection -1] } $menuName insert 0 cascade -label "Export Deck" -menu $menuName.exportdeck } else { if {[string equal disabled [$menuName entrycget "Export Deck" -label]]} { $menuName entryconfigure "Export Deck" -state normal } } } else { if {$Hooked} { if {![string equal disabled [$menuName entrycget "Export Deck" -label]]} { $menuName entryconfigure "Export Deck" -state disabled } } } } } }
  22. 2 likes
    With the last Activate version 2019.2, under Model we have the new “Finalization” tab where we can type an oml script that is executed at the end of the simulation. I’ve found this capability extremely useful for frequency analyses... I’ve created a simple model where we run a co-simulation between Activate & Motion (the approach works also using Activate in standalone mode but with the Motion integration is definitely more interesting). All the related files and the video are enclosed. In the example, we have a system of 2 masses: mass1 and mass2. The input to the Multi-body System is the force on mass2 while the output is the displacement of mass1. Force and displacement are respectively passed as Input1 and Input2 to the FrequencyWorld superblock in the Activate diagram. When you run the Activate model a dialog box appears. Here you can set the sampling frequency (be careful to aliasing issues since the value will affect the Nyquist frequency) and the type of analysis: Turn 0 to 1 the options if you want to analyse in frequency input 1, input 2 and/or the Transfer Function input1/input2. When you turn 1 the last option, the file TF.mat with the transfer function information is generated in the same model folder to be used for further analyses in Compose (e.g. LTI ROM generation…). For each input, the model calculates the fft together with the PSD. The calculation is made in Model-Finalization where we also handle the various options. The script is a bit articulated to properly handle every scenario (even/odd number of the sampling data, leakage, normalization…) Scripts and FrequencyWorld superblock can obviously be re-used for other applications (and easily improved e.g adding filters ...). Best, Liv FFT_PSD_TF.mp4 FFT_PSD_TF.zip
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    Based on my quick look at the database, you do not have the interface surface attached to the Rotor volume - only that for the Fixed/main volume. Right-click 'Air-rotor' under Volumes and select Mesh Op. > Find Missing Surfaces. This will generate the other set of surfaces, attached to the Rotor Volume. It appears you already have two sets of nodes there, but the surface definition was missing. This new surface set should have the same treatment as 'interface' > deactivate Simple BC, and activate Interface Surface with 0 for gap and gap_factor. If you know or can estimate the angular velocity, it's simpler to use rotation mesh motion rather than rigid body. It's difficult to estimate the resistance to rotation due to the gearbox, etc, so the angular velocity / rotation from Rigid Body motion is probably going to be higher than the actual would be.
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    Hi, you can try to add torque based on BISTOP function to limit joint motion. Please refer to the attached document (from Hyperworks for MBD 13). HyperWorks_for_MBD_v13.pdf
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    Hi Laura, You can merge the bodies in MV keeping only the necessary components to represent your system. For instance, parts represented on the CAD like bolts, bearings, welds, etc do not need to be represented in your simulation. Therefore it is either recommended to group it in one single body or delete them. Best regards, Felipe.
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    Hi Duc_Hoang, In preference you selected to run at the model location it seems, you can also do one thing, you can change the option in run option in inspire and also in run option in Inspire cast in preference, (try this it will work) if possible send the file if it doesn't work, we shall check. With Kind Regards, Sourav Das | HyperWorks Specialist-FEA| Academic Program | sourav.das@altair.com | www.altairhyperworks.com Altair | Innovation Intelligence® Secure file dropbox https://ftam1.altair.com/filedrop/sourav.das@altair.com
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    Hi, This is a lot more complicated. You can try the following: Create your derived load case 1 Switch on the needed contour (P1) Export model, including results (File->Export->Model) .. e.g. P1.h3d Create your derived load case 2 Switch on the needed contour (P3) Export model, including results (File->Export->Model) .. e.g. P3.h3d Open expression builder Add resources (Open first P1.h3d, than P3.h3d) Select the element stresses P1 (now scalar) and insert, press Minus Select the element stresses P3 (now scalar) and insert The result is simple: S1-S2 I can't try it at the moment, but please give me a feedback. Best regards, Mario
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    Hi, it is possible to use nonlinear quasistatic analysis as a preload for linear buckling analysis (see attached model). From Optistruct help: NLASTAT+BUCKLING.hm
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    Hi Mohammed I haven't done this yet, you can try: pltINote_handle SetAttachment curve pltINote_handle SetAttachToCurveIndex $curveID pltINote_handle SetAttachToPointIndex point_index to find point_index you can GetVectorHandle and from vectorHandle GetValuesList list. Find at what index the maximum value occurs in the value list.
  31. 2 likes
    Hello Holo, In fact, your problem is that you have made a mistake in the input power calculus. You have assumed that, as far as each current source provides 2100 W (mean value) the three will provide three times this quantity (this is, 6300 W). This is not the case, as far as you have a neutral cable (four cable connexion, taking into account the ground) the sources are consuming some of the energy produced by the others, in other words some of this power is coming back to the grid. If you plot the sum of the active power of the three phases in each instant you will obtain the next curve below, with a mean (ignoring the transitory part) of 4235 W. This match much better with your results. Anyway, I advise you to simulate some additional rotor positions in order to assure global accuracy. So you will have a power equilibrium as follows: P_input = 4235 W P_mec=4170 W (mean torque equal to 26.55 Nm) P_Joule= 13+45=58 W P_Berttoti=2.56*4 W=10.24 W The rule is: any quantity calculated directly from the regions should be multiplied by the number of portions in your periodicity but the quantity calculated from the circuit are not multiplied since the circuit already takes into account the periodicity in order to obtain the electric variables (i.e., currents and voltages). On the other hand, if you want to avoid the problem of the neutral in your circuit I advise you to try this connexion: As you can see, the third current source is no longer necessary as far as the other two are already imposing the current to the third branch. If, anyway, you want to represent it (e.g., because you are interested in its behaviour) you should do as follows: The resistance above should be a very high one, since this branch is only there to avoid that small differences between the current sources (i.e., numerical noise) leaves to inconsistent equations . For example a value for 1E7 is fine. Hope this helps. Best regards,
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    Hi, Load Extraction is also possible with rigid bodies. Keshav_Webinar_Load_Extraction - Altair Check tutorial: mv-3030: Load export: load_export.mdl mv-3030.pdf
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    Solved : There was a small eeror in the code. One of the object was not destroyed properly set job_folder "C:\\Users\\xcxc\\Desktop\\test_ui\\test" set num_of_modes 15 #get the directory# set dirname [file dirname [info script]] set template_dirname "$dirname/Report_Template.pptx" #handle the files# file copy -force "$dirname/Report_Template.pptx" "$job_folder/Report/Report.pptx" #modify the PPts# package require twapi set ppt [::twapi::comobj PowerPoint.Application] $ppt DisplayAlerts [expr 0] set presents [$ppt Presentations] set active_presentation [$presents Open "$job_folder/Report/Report.pptx"]; #Open the Presnetation set slides [$active_presentation Slides]; #gte the slide list set slide_1 [$slides Item 1]; #get control on slide index 1 set object_list {} set mode_counter 1 while {$mode_counter <= $num_of_modes} { set slide_num [expr {$mode_counter + 1}] set slide_$slide_num [$slides Add $slide_num 12]; #add one more slide into the presentation set slide_$slide_num\_shapes [[set slide_$slide_num] Shapes] set slide_$slide_num\_video_1 [[set slide_$slide_num\_shapes] AddMediaObject2 [file nativename "$job_folder/Report/Mode_$mode_counter\_Iso_Front.avi"] -1 -1 20 100 650 300] set slide_$slide_num\_video_2 [[set slide_$slide_num\_shapes] AddMediaObject2 [file nativename "$job_folder/Modal_Analysis/Report/Mode_$mode_counter\_Iso_Back.avi"] -1 -1 500 100 650 300] lappend object_list "slide_$slide_num" lappend object_list "slide_$slide_num\_shapes" lappend object_list "slide_$slide_num\_video_1" lappend object_list "slide_$slide_num\_video_2" incr mode_counter 1 } $active_presentation Save foreach object $object_list { puts $object [set $object] -destroy } $slides -destroy $active_presentation -destroy $ppt Quit $ppt -destroy
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    Yes, No.3 is not clear how to do (i double click but its loadadd does not. Anyway try and reply me results: #hide all loadcols: *createmark loadcols 1 all *displaycollectorsbymark loadcols 1 off 1 1 #show all loadsteps foreach LS [hm_entitylist loadsteps name] {*displaycollectorwithfilter loadsteps on $LS 1 1} #delete undisplayed loadcols: *createmark loadcols 1 displayed *createmark loadcols 1 reverse *deletemark loadcols 1
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  36. 2 likes
    Free eBook: Design the Inspire Way – A Practical Introduction to solidThinking Inspire click on the title here This book is a very light-weight introduction into the exciting world of the “Simulation Driven Design Process”. It is meant to give pupils, undergraduate students and maybe even designers new to Computer Aided Engineering CAE a “taste”, a first idea on how simulation, especially conceptual design (simulation) works. The tool of choice used in this book is solidThinking Inspire®. Inspire enables design engineers, product designers, and architects unfamiliar with numeric simulation, to make optimal use of the material by placing it only where needed to meet structural requirements. Become Inspired ...
  37. 2 likes
    Alex, It has been a while since you asked that question. I don't know if you still need help. If you do, please check Analysis -> Preserve nodes see if there are any preserve nodes in your model. HM would automatically delete those once you transfer any preserve nodes to normal nodes.
  38. 2 likes
    Use MATHE card.PFA screenshot for same.
  39. 1 like
    hi 1. mindim is a minimum member size manufacturing constraint. It penalizes the formation of small members and reduces checkerboarding effect. It is recommended that MINDIM be at least 3 times the average element size for all elements referenced by that DSIZE (or all designable elements when defined on DOPTPRM). The average element size for 2D elements is calculated as the average of the square root of the area of the elements, and for 3D elements, as the average of the cubic root of the volume of the elements. 2. Volfrac is a fraction of design space, expressed in the range between 0-1. Volfrac as the optimization constraint with an upper limit as 0.2 means the optimizer will utilize only 20% volume of the design space. 3. Use LOADADD and SPCADD load collectors to combine multiple loads and spc load collectors, respectively then reference them properly in the loadstep. Free-size Optimization Manufacturability.pdf
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    Thanks for your reply Arjun and also important what Frankg writes. Sorry for me it is not an easy task to get the max out of my Mac system. Needless to say I would really appreciate a solution that include Mac in a better way. I love Inspire.
  41. 1 like
    I load (on dropbox, here I can't because of the size) the h3d with the result of the static analysis so you can see what I've tried to explain above: https://www.dropbox.com/s/4whuo2cvxtgdlr3/carro-rev-rinforzi-mesh-statica-1LoadStep.h3d?dl=0 the pdf contains a possible solution..? I've thought about putting another constraint in component t28.. component_t28.pdf
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    Hi, Can you try with imposed speed. in the mechancial set rotor use imposed speed and put the value of your speed. Best regards.
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    Hi, while you have increased the mass of the impactor the initial kinetic energy is still not enough to plastically deform the crash box. You can load the model with imposed displacement and obtain the energy required to deform the crashbox by plotting the total energy in Hypergraph and observing the corresponding deformation in Hyperview. Then you can use this energy as the initial kinetic energy to calculate the required velocity and mass of the impactor. There are modeling errors: the base plate of crashbox is not attached to the fixed supporting structure so it will slide sideways when loaded. the impactor has a relatively small contact area and it can lose contact during deformation. Provide some friction or use larger impactor plate the mesh quality is bad. Use F10 Check elements>3D to check the solid element quality and remesh accordingly. the impactor and some other components are meshed inappropriately by double walls, effectively halving the stresses. You have to mesh a single mid surface instead. imposed_displacement_0000.rad
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    I don't know the use case or application for multiple material in size optimization.Attached is two setup for size optimization with stiffness & thickness parameter. I think if you have objective to do size optimization for five different material then you need to create design variable property relationship five times manually. Note: Multiple-Material Topology Optimization is available from optistruct 2017.1 version. young.fem size1.fem Multiple-Material.zip
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    Other thoughts: 1. If the circular object represents a parabolic reflector that you're analyzing with curvilinear elements and RL-GO, you might also want to try, for comparison, flat mesh elements. Those would then need to be a lot smaller, and you'd have to choose the best surface approximation under advanced mesh settings. 2. You might also want to try, for comparison, a finite metal "ground" object instead of the infinite structure. 3. The concept of scattered field can sometimes trip up a user. In the laboratory, you always measure total field (and the extent of the incident field is finite). In a simulation, you have to be careful whether you're displaying total field or scattered field. The scattered field is a mathematical concept: the difference between incident and total field. In a shadow region, to produce small total field, a simulation tool will show a large scattered field (counter-intuitive), out of phase with the incident field (which is everywhere at all times).
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    Hi, There is no available api But by dumping the check box, I see its state variable is: ::post::optionsdialog::usepcolor you can set it equal true to turn on and false to turn off the check box after set it, you must call: ::post::optionsdialog::OnButtonPressed 0 because actual state variable is hidden and if you don't call that proc, it will restore the above variable! (this is called as you click "Apply")
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    Hello Wiz211 Also try deleting the settings file and try again
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    /PRELOAD というカードで、ソリッド要素で作ったボルトに、簡単に予張力を入れることができるようになってます 作業動画 preload.mp4 入力ファイル preload01_0000.rad, preload01_0001.rad
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    You embeded tkcon into a widget which is embeded in tab ==> so you already embeded tkcon in tab Please avoid it. before close your GUI, invoke SwitchTkCon again to move tkcon to original position
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