HI cheqbook123
Please explain what you mean by accounting software?
Please note this is the Altair HyperWorks Academic Support forum intended and used only for Academics and students using our HyperWorks suite of software.
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Re: Issues when installing student version
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SPCD
hello together,
I am building a modell for a direct frequency response analysis.
I was wondering how to handle the SPCD load collector:
I have 2 SPCD constraints at different nodes. Both SPCD are stored in the same load collector.
The applied force is built by the RLOAD2 card e.g. amplitude=10
Now I am asking myself, how is the load distributed?
Is the load in each SPCD amplitude=5 ?
or
Is the load in each SPCD amplitude=10 ?
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Re: SPCD
Hi,
the total amplitude which is specified is 10 but for each node it is 5. So the node will displace to 5 units not 10.
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Re: SPCD
Student_1739
Looks like you are modelling with multiple excitations, i.e. your model is excited at two different places and hence two different spcd are created by you.
The SPCD is the card that actually defines the amplitude also called excite ID in the rload card.
To have two excitations you must create two rload cards, the exciteID of both these rloads will be the two separate spcd you already have, refer both these cards in a DLOAD card and then refer this in the DLOAD filed in the loadstep definition.
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Re: SPCD
actually I only have one excitation which I want to be transfered into the whole specimen through those two SPCD contraint nodes
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Re: SPCD
Student_1739,
You mean the same excitation applied at two different points in the model, I still suggest you use two different rload cards, referring the two spcd, these in turn will be referred to in a dload load collector, which will then need to be entered in the dload field of the loadstep.
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Re: SPCD
basicly I want to simulate the following situation.
I have one generator which is connected to one specimen at two points.
What I did so far:
I created one load collector for those 2 dynamic constraints, both referring to the same RLOAD card.
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Displaying Boundary conditions i.e. Loads and Constraints in Hyperview
Hello everyone,
Is there any way in hyperview to display the constraints and loads in Hyperview along with the contour plots. It becomes much easier for visualization. I know it is there in Hypermesh Post, but cant find the same in Hyperview..
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Re: Displaying Boundary conditions i.e. Loads and Constraints in Hyperview
Hi ameyaforever
Please create two windows in HyperMesh Desktop, One for HyperMesh and one for HyperView side by side. You can then conveniently visualize the loads and constraints in the HyperMesh window and the results in the HyperView window.
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Request the force from the rigid element
Hello,
I am using bolt connections between two parts, and I would like to know the amount of the developing force. Could you help me please how to do it?
Thanks:
Sanyo
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Re: Request the force from the rigid element
Hi Sanyo,
you can use ELFORCE card to output element forces but it will not output rigid element data.
instead of using a rigid element you can use a CBAR element while modeling a bolt and request ELFORCE for CBAR.
to request ELFORCE: go to Analysis page-->control cards-->Global_output_request-->ELFORCE
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Re: Request the force from the rigid element
Sanyo,
Alternatively you can request for GPFORCE which will output the reaction forces at grids.
let us know if this helped you
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Re: Request the force from the rigid element
Sanyo,
also you can try with MPCFORCE to output results for rigid elements.
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Re: Err: 5
When using equivalence the problem is, that I can fix the most free edges, but for some I need a high cleanup-tolerance and then the generated elements don't represent the real geometry.
What do you mean with "solid option" ? The whole volume represents the fluid, so there are no solids or do I missunterstand you?
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Instructive example concerning function RainFlow() needed
Hi
I would like to use the function RainFlow() in HyperMath 12.0.
Help (F1) describes the syntax as: result = RainFlow(yvect, numbins, minrange, maxrange, output, hysteresis)
The HyperMath editor in the files-window, however, shows the syntax as
Rainflow (vector, vector, scalar)
I always get an error
30: error in function 'RainFlow'.
when trying to use this function in a HyperMath script.
Has anyone a small instructive example available (e.g. a rainflow counting applied to a vector containing values of a sine function)?
Thanks in advance for any support.
Best regards
Matthias Leiner
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How to change the display format of numbers in MV?
Hi,
In MV, I am frequently using SI units in the context of mechatronic problems. The display format in MV is a fixed format with 4 digits after the decimal point. All numbers less than 5e-5 are shown as 0.0000. This can happen quite often when using SI units (--> using meter instead of the default millimeter).
My question: How can I change the display format of numbers (e.g. to scientific format)?
Best regards,
Matthias Leiner
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Modellierung eines 3-Punkt Biegeversuches
Guten Tag,
Ich versuche einen 3-Punkt Biegeversuch mit einem Composite zu simulieren um anschließend die Materialparameter des Sandwichwerkstoffes an die Versuchsergebnisse anzupassen.
Die Modellierung des Composites hat funktioniert, denn durch die Aufbringung einer Last habe ich bereits einer Analyse durchgeführt. Allerdings möchte ich wie beim Versuch auch einen Stahl Zylinder in der Mitte der Probe stückweise absenken.
Daher habe ich den Load Step auf "Non-linear quasi Satic (NLSTAT)" geändert. Den Load Case habe ich als BC => Constraint modelliert. Statt SPC habe ich jedoch MOTNG(D) ausgewählt. Weiterhin habe ich als das Häckchen bei DOF3 gesetzt, da der Zylinder später in Z-Richtung abgesekt werden soll. Dazu habe ich noch die Karte "NLPARM" erzeugt.Ob dies richtig ist. bzw. wofür die Buchstaben in der Klammern stehen sind meines Erachtens aus der Hilfe nicht ersichtlich. Für Erklärugen diesbezüglich, falls MOTNG, der richtige Load Type ist, bin ich dankbar.
Weiterhin wird noch gefordert, dass eine CURVE definiert wird. Dies habe ich getan. Allerdings fehlt dort irgendwie ein Bezug drauf. Ich habe eine XY-Datenreihe erstellt, bei dem X die Inkremente darstellen sollen und Y die Absenkung in Z-Richtung sein soll. Das habe ich mir allerdings nur beim erstellen der Daten gedacht, aber ich denke dem Programm fehlt eine Information was es mit meiner CURVE anstellen soll.
Um den Zylinder abzusenken, habe ich einmal den Weg ausprobiert die COMPONENT auszuwählen und einmal die Knoten in einem SET zusammenzufassen und das SET auszuwählen.
Die Kontatformulierung fehlt bisher, allerdings fiel mir bereits beim check auf, dass die ERROR-Meldung etwas mit dem LOAD STEP oder den zugehörogen CARDS zu tun hat, denn obwohl die Karten "NLPARM" erzeugt und editiert wurden, lautete die Fehlermeldung sinngemäßf, dass „NLPARM“ als input Card fehlen soll.
Ich habe bisher kein Tutorial, dass ähnlich ist gefunden, aber für Hilfe oder eine kleine Anleitung speziell für den "nom-linear quasi static LOAD CASE" wäre ich dankbar.
mit freundlichen Grüßen
Christoph Wälter
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Re: How to change the display format of numbers in MV?
Hi Matthias,
As per the help documentation, HyperWorks Desktop Applications > MotionView > MotionView Overview > Data Entry:
Entering Property Data
We see that Three types of data can be entered in panel text boxes:
• Constant values
• Mathematical expressions
• Template expressions
Most data is entered as constant values. You can enter a constant value in any standard-floating point or integer format, including scientific notation. MotionView reformats the number when you leave the text box.
Can you name exactly the panels where this is a problem? where do you need the scientific notation ? and also which version are you using (with update information) I see for instance that in add body panel there is scientific notation in the inertia properties fields, similarly in the add points coordinate fields etc.
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Re: Instructive example concerning function RainFlow() needed
Hi Matthias,
I see that Rainflow - Reduces the number of vector points from the test data without losing the damage, magnitude, and/or effect of the test data.
You can use the rainflow function in the exact same way in HyperGraph as well, attached is a video on its application in HyperGraph, rename the image from jpg to wmv.
You can also obtain debug information and figure out where you need to modify your input.
see HyperWorks Desktop Reference Guides Overview > Templex and Math Reference Guide > Math Reference > Functions and Operators > List of External Functions > rainflow
Perhaps you can provide us the input information, your initial curve (vector) data etc and we may be able to help better.
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Re: Modellierung eines 3-Punkt Biegeversuches
Hello,
please let me translate first, as the support forum language is usually in English (as this is an international support site). If I understand correctly, you want to know:
1) How to define an enforced displacement on your bolt (currently done with MOTNG(D))?
2) How to assign a nonlinear displacement curve to the enforced displacement?
3) How to correctly set up a non-linear quasi-static simulation with OptiStruct
I checked your model, and can give the following recommendation:
1) The correct load type would be SPCD in order to define an enforced displacement. MOTNG(D) is for Multibody Dynamic Analysis and can not be used in static load cases. Please consider that in non-linear analysis, additional degrees of freedom apart from your z-motion need to be constrained to zero, so that the bolt can not move in an undesired direction (e.g. rotation around the bolt axis or moving in x-y plane)!
2) I think the non-linear load curve can be only given in a NLGEOM analysis but not in a NLSTAT analysis type. I would recommend NLGEOM also as your displacements are very large and NLSTAT is only valid for small displacements. The NLGEOM bending of a plate is described in OS Tutorial -1500.
To assign a curve to a displacement, you need a TABLED1 keyword. To create this, use a load collector in HyperMesh and assign the correct Card Image. You can then enter the x,y values of your loading curve. The SPCD and TABLED1 are joined in a NLOAD1 card (also via load collector).
3) For the non-linear subcase, you need to give the number of load increments and the number of non-linear iterations for each increment in the NLPARM (NLSTAT) or NLPARMX (NLGEOM) card. Again, this card is created via load collector. You need to reference this NLPARM card in your Subcase / Loadstep
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