WS17-1 PAT301, Workshop 17, October 2003 WORKSHOP 17 BOX BEAM WITH TRANSIENT LOAD

WS17-2 PAT301, Workshop 17, October 2003

WS17-3 PAT301, Workshop 17, October 2003 Problem Description u This workshop involves a transient analysis of the 2D Quad4 element cantilevered box beam model described in workshop 12. The model is modified to include four concentrated masses at the free end of the beam. Also, the applied force is left at the same location, but it is modified to be time dependent. Prior to the transient analysis, a modal analysis is performed to determine the first ten natural frequencies and corresponding modes of the model. This helps in specifying the parameter values for the transient analysis. The transient analysis uses modal superposition. The damping is set to be fraction of critical. In addition to displaying the shape of the model over time, the displacement versus time in an XY plot is obtained for some selected nodes.

WS17-4 PAT301, Workshop 17, October 2003 Suggested Exercise Steps 1. Open the database that was created in Workshop 12, cant_beam_transient.db. 2. Add concentrated mass to the four corner nodes at the free end of the cantilevered beam. 3. Create a group with a subset of elements to be used for post processing. 4. Post the group with the subset of elements to see that the group was correctly created. 5. Create a non-spatial field (function) of time to be used to define the applied force. 6. Create time dependent load case. This is necessary when creating a time dependent load. 7. Modify the static load for Workshop 12 to be time dependent. 8. Perform a modal analysis. Extract 10 natural frequencies and modes. View modal results. 9. Perform transient simulation. Specify number of time increments and time step. Also, specify the modal damping.

WS17-5 PAT301, Workshop 17, October 2003 Suggested Exercise Steps (Cont.) 10. Access transient results. 11. Display transient deformation results. 12. Create XY plot of displacement versus time. 13. Customize appearance of XY plot.

WS17-6 PAT301, Workshop 17, October 2003 Step 1. Open Database cant_beam_transient.db Open database. a.File / Open. b.Select cant_beam_transient. c.Click OK. b c a NOTE: Notice you get a warning message $# Journal file:….cant_beam_transient.db.jou does not exits. This is not a problem. A journal file does not exist for this database because one was not created when creating this database, i.e. File / Save a Copy has a toggle Save Journal File Copy Also.

WS17-7 PAT301, Workshop 17, October 2003 Step 2. Add Concentrated Masses to the Four Corners Select the four corners of the concentrated mass. a.Elements: Create / Element / Edit. b.Shape: Point. c.Topology: Point. d.Turn Auto Execute off. e.Click on Node 1 = and select the four nodes at the corners of the free end of the beam. f.Click Apply. Zoomed a b c e Add concentrated masses to the four corners of the box beam at its free (unconstrained) end. This is done to create low frequency modes that are predominantly similar to beam bending in nature. Small triangles are drawn at the nodes where the mass is created. d Note that node numbers may not be identical when performing this exercise. d f

WS17-8 PAT301, Workshop 17, October 2003 Step 2. Add Concentrated Masses to the Four Corners (Cont.) Specify the mass of each of the four concentrated masses. a.Properties: Create / 0D / Mass. b.Enter mass_prop for the Property Set Name:. c.Option(s): Lumped. d.Click on Input Properties. e.Specify Mass as f.Click OK. g.Click in Select Members under Application Region. h.Select Point element icon in the picking filter menu. i.Select the four 0D mass elements at the free end of the beam. j.Click Add. k.Click Apply. a b c d e g h i j k h

WS17-9 PAT301, Workshop 17, October 2003 Step 3. Create a Group with Subset of Elements Create a group with subset of elements a.Group / Create. b.Enter subset_elm under New Group Name. c.Check Make Current. d.Group Contents: Add Entity Selection. e.Select Entity Selection and select a row of elements going from one end to the other as shown in the figure. f.Click on Apply. a b c d e f e The stresses will be calculated only for elements in this group. This will reduce the amount of calculations done, compared to doing it for the entire set of all elements.

WS17-10 PAT301, Workshop 17, October 2003 Step 3. Create a Group with Subset of Elements (Cont.) Include the nodes corresponding to elements in the group subset_elm a.Tools / List / Create. b.Set the Model/Object/Method to FEM/Node/Association. c.Association: Element. d.Click on Target List: A. e.Select on Element and select the same row of elements going from one end to the other just as done in the previous page. f.Click on Apply. g.Add the list of nodes to the group subset_elm by selecting Add to Group. h.Click on Apply. d f a b c e The list of nodes will be placed in the dialogue List A. g h

WS17-11 PAT301, Workshop 17, October 2003 Step 4. Post Group subset_elm Post group subset_elm. a.Group / Post. b.Select subset_elm under Select Groups to Post. c.Click on Apply. a b c

WS17-12 PAT301, Workshop 17, October 2003 Step 4. Post Group subset_elm (Cont.) Display both the element and node labels. a.Display / Finite Elements. b.Show All FEM Labels. c.Click on Apply. Display the entire model. d.Group / Post. e.Select default_group under Select Groups to Post. f.Click on Apply. g.Turn off all labels. a b c g This also can be done using Label Control icon.

WS17-13 PAT301, Workshop 17, October 2003 Step 5. Create and Post Non-Spatial Field Create a non-spatial field(function) that will be used as the multiplier for the applied force. a.Fields: Create / Non Spatial / Tabular Input. b.Enter delta_force under Field Name. c.Scalar Field Type: Real. d.Active Independent Variables: Time(t). e.Click on Input Data. f.Select Map Function to Table. g.PCL Expression f(t): 1*exp(-0.35*t). h.Start time: 0. i.End Time: 1. j.Number of Points: 28. k.Click on Apply. l.Click on Cancel. a b c d e f g h i j k l

WS17-14 PAT301, Workshop 17, October 2003 Step 5. Create and Post Non-Spatial Field (Cont.) Continue to create a non-spatial field(function) that will be used as the multiplier for the applied force. a.Select row 29 for Time(t), and enter 1.1 in Input Scalar Data. Press Enter on keyboard. b.Select row 30 for Time(t), and enter 3.0 in Input Scalar Data. Press Enter. c.Enter 0.0 for Value in row 29 and 30. d.Click on OK. e.Click on Apply. a b d c

WS17-15 PAT301, Workshop 17, October 2003 Step 5. Create and Post Non-Spatial Field (Cont.) a.Fields: Show. b.Select delta_force under Select Field To Show. c.Select Specific Range. d.Minimum: 0.0. e.Maximum: 3.0. f.No. of Points: 30. g.OK. h.Check Post XY Plot. i.Click on Apply. a b d c e f g i h

WS17-16 PAT301, Workshop 17, October 2003 Step 5. Create and Post Non-Spatial Field (Cont.) nClick on Cancel. a

WS17-17 PAT301, Workshop 17, October 2003 Step 6. Create a Time Dependent Load Case Create time dependent load case needed for time dependent load creation. a.Load Cases : Create. b.Enter Transient_1c under Load Case Name. c.Click on Make Current. d.Load Case Type : Time Dependent. e.Click on Apply. a b c d e

WS17-18 PAT301, Workshop 17, October 2003 Step 7. Modify the Applied Force Modify the force to include t(time). a.Loads/BCs: Modify / Force / Nodal. b.Current Load Case: Transient_1c. (Type: Time Dependent) c.Select force under Select Set to Modify. d.Modify Data. e.Change to in Force. f.Click in * Time/Freq. Dependence and select delta_force under Time/Freq. Dependent Fields. g.Click on OK. h.Click on Apply. a b c d f g h e f g NOTE: The spatial and time dependent functions are multiplied, e.g. * f:delta_force. Make sure that force is assigned to Load Case Transient_1c.

WS17-19 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis Create the Load Case to be analyzed a.Load Cases: Create. b.Load Case Name: modal. c.Load Case Type: Static. d.Click on Assign/Prioritize Loads/BCs. e.fix_end is to be included under Assigned Loads/BCs. To do this select on Displ_fix_end under Loads/BCs Selection. f.Click on OK. g.Click on Apply. a b c d f e e

WS17-20 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis (Cont.) Create job to analyze. a.Analysis: Analyze / Entire Model / Full Run. b.Enter cant_beam_subset_modal _1 for the job name. c.Solution Type. d.Select NORMAL MODES. e.Click on OK. f.Click on Subcases. a b c d e f

WS17-21 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis (Cont.) Continue to create the job for the modal analysis. a.Select modal under Available Subcases. b.Select modal under Available Load Cases. c.Subcase Parameters. d.Extraction Method: Lanczos. e.Lower = 0.0(Hz). f.Upper = 100.0(Hz). g.Click on OK. h.Click on Apply. i.Click on Cancel. a b d e f g h c i

WS17-22 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis (Cont.) Run the modal analysis. a.Subcase Select... b.Select modal under Subcases For Solution Sequence: 103. Make sure only modal appears under Subcases Selected. c.Click on OK. d.Click on Apply. This will run the modal analysis. a b c b d

WS17-23 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis (Cont.) Attach XDB File. a.Analysis: Access Results / Attach XDB / Result Entities. b.Click on Select Results File. c.Select and attach the file cant_beam_subset_modal _1.xdb. d.Click on OK. e.Click on Apply. a b c d e

WS17-24 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis (Cont.) Create deformation display for the first mode. a.Results: Create / Deformation. b.Select MODAL, A2:Mode 1:Freq.= under Select Result Case(s). c.Select Eigenvectors, Translational under Select Deformation Result. d.Show As: Resultant. e.Click on Apply. a b c d

WS17-25 PAT301, Workshop 17, October 2003 Step 8. Modal Analysis (Cont.) Create deformation display for other modes. a.Select MODAL, A2:Mode 2:Freq.= under Select Result Case(s). b.Click on Apply. c.Select MODAL, A2:Mode 3:Freq.= under Select Result Case(s). d.Click on Apply.

WS17-26 PAT301, Workshop 17, October 2003 Step 9. Run the Transient Simulation Before setting-up the simulation under Analysis it is necessary to specify the loads and boundary conditions under Load Cases a.Load Cases: Modify b.Select the load case Transient_1c under Select Load Case to Modify. c.The Loads/BCs fix_end(constraint) and force(time varying) must be specified under Assigned Loads/BCs. This can be done by selecting them under Loads/BCs Selection(upper-left). d.Click on OK. e.Click on Apply. a b c

WS17-27 PAT301, Workshop 17, October 2003 Step 9. Run the Transient Simulation (Cont.) Run the Transient Simulation. a.Analysis: Analyze / Entire Model / Full Run. b.Enter Job Name cant_beam_subset_elm c.Select Solution Type. d.Choose TRANSIENT RESPONSE for Solution Type. e.Formulation: Modal. f.Click on Solution Parameters. g.Eigenvalue Extraction. h.Extraction Method: Lanczos. i.Lower = 0.0 (Hz). j.Upper = (Hz). k.Number of Desired Roots = 10. l.Click on OK. m.Click on OK. n.Click on OK. b c d e f g h i j k l m a

WS17-28 PAT301, Workshop 17, October 2003 Step 9. Run the Transient Simulation (Cont.) Create transient loading subcase. a.Select Subcases. b.Solution Sequence: 112. c.Action: Create. d.Select Transient_1c under Available Subcases. Automatically Transient_1c should highlighted under Available Load Cases. e.Subcase Parameters. f.Select DEFINE TIME STEPS. g.No. of Time Steps = h.Delta-T = i.Click on OK. j.Modal Damping: Crit. Damp. (CRIT). k.DEFINE MODAL DAMPING. l.Click on Add Row. m.Enter 0.0 and for Frequency, for both Values. n.Click on OK. o.Click on OK. b c d e f g h i j k

WS17-29 PAT301, Workshop 17, October 2003 Step 9. Run the Transient Simulation (Cont.) Select the output Requests. a.Select Output Requests. b.Form Type: Advanced. c.Select Element Stresses under Select Result Type. d.Select STRESS(SORT…)=ALL FEM,… under Output Requests and make sure that Displacement and SPCForces requests appear as well. e.Now, choose subset_elm under Select Group(s)/SET. This will change the Output Request to STRESS(SORT…)=subset _elm,… f.In Options: select By Freq/Time for Sorting. g.Click on OK. h.Click on Apply. i.Click on Cancel. b c d e f g a

WS17-30 PAT301, Workshop 17, October 2003 Step 9. Run the Transient Simulation (Cont.) Select Subcase. a.Select Subcase Select. b.Under Subcases Selected, only the desired subcase, Transient_1c should appear. This can be achieved by selecting names in the upper and lower boxes. c.Click on OK. d.Click on Apply. a b c d

WS17-31 PAT301, Workshop 17, October 2003 Step 10. Access Results Under Analysis Attach transient results XDB file. a.Analysis : Access Results / Attach XDB / Result Entities. b.Click on Select Results File. c.Select and attach the file cant_beam_subset_elm.xdb. d.Click on OK. e.Click on Apply. a c d b e

WS17-32 PAT301, Workshop 17, October 2003 Step 11. View the Transient Deformation Results View time dependent deformation results at a single time. a.Results : Create / Deformation. b.Click on the View Subcases icon. c.Select TRANSIENT…Time= under Select Result Case(s). d.Select Displacement, Translational under Select Deformation Result. e.Show As: Resultant. f.Click on Apply. g.Show As: Component. h.Select YY only. i.Click on Apply. j.Look at other individual times. The title in the upper left corner of the viewport gives the time and result type. a c d d b e

WS17-33 PAT301, Workshop 17, October 2003 Step 11. View the Transient Deformation Results (Cont.) Next, look at how the model deforms with time. a.Results: Create / Deformation. b.For the View Subcases icon not depressed, select all the transient subcases under Select Result Case(s) using the shift key. Or, can select all or a subset of the transient result cases by selecting the View Subcases icon (see next page). c.Select Displacements, Translational under Select Deformation Result. d.Show As: Resultant. e.Check Animate. f.Select Animation Options. a b f c View Subcases d e

WS17-34 PAT301, Workshop 17, October 2003 If View Subcases icon is used to select subcases, the following steps are to be followed: a.Click on View Subcases then Select Subcases. b.Filter Method: Global Variable. c.Variable: Time: Min:0. d.Values: Above: Value:0. e.Select Filter. This will fill out the bottom of the dialogue. f.Click on Apply. g.Click on Close. h.Under Select Result Case(s) theres only one line for all transient results, 3001 of 3001 subcases. i.Select Displacement, Translational under Select Deformation Result. j.Show As: Resultant. k.Check Animate. l.Select Animation Options. Step 11. View the Transient Deformation Results (Cont.) b c d e f h i j k l

WS17-35 PAT301, Workshop 17, October 2003 Step 11. View the Transient Deformation Results (Cont.) Continue to view transient deformation results. a.Animation Method: Global Variable. b.Select Time under Select Global Variable. c.Set End Value to 3.0. d.Select 3D under Animation Graphics. e.Number of Frames: 24. f.Click on Apply. a b d e f c

WS17-36 PAT301, Workshop 17, October 2003 Step 12. Create an XY Plot of Displacement Versus Time Create XY plot of displacement versus time. a.Results: Create / Graph / Y vs X. b.Select All result cases manually under Select Result Cases(s) by using the Shift key. c.Select Displacements, Translational under Select Y Result. d.Quantity: Y Component. e.X: Global Variable. f.Variable: Time. g.Select on Target Entities icon. a b c d e f g

WS17-37 PAT301, Workshop 17, October 2003 Step 12. Create an XY Plot of Displacement Versus Time (Cont.) Continue to create an XY plot of displacement versus time. a.Reset the graphics to un- display any results b.Target Entity: Nodes. c.Select Nodes: Click on the top corner node as shown in the figure. d.Click on Apply. b c d b a c

WS17-38 PAT301, Workshop 17, October 2003 Step 12. Create an XY Plot of Displacement Versus Time (Cont.) View resulting plot. a.The plot should look like the following. The XY plot is created for one displacement, Node 44 Y- component. Notice that the displacement follows the applied force.

WS17-39 PAT301, Workshop 17, October 2003 Step 12. Create an XY Plot of Displacement Versus Time (Cont.) Create another XY plot a.Add another XY plot by selecting the node shown in the figure. The XY plot is created for two displacements.

WS17-40 PAT301, Workshop 17, October 2003 Step 13. Customize the Appearance of the XY Plot Customize the appearance of the XY plot a.XY Plot: Modify / XYWindow. b.Check Display Border. c.Click on Apply. d.Modify / Curve. e.Select default_Graph30. f.Title… g.In Curve Title Text, change the title to Node 41: Y Displ. h.Click on Apply. i.Select default_Graph31. j.In Curve Title Text, change the title to Node 44: Y Displ. k.Click on Apply. a b c d e f g h

WS17-41 PAT301, Workshop 17, October 2003 Step 13. Customize the Appearance of the XY Plot (Cont.) Continue to customize the appearance of the XY plot. a.XY Plot: Create / Title. b.Title: Displ vs. Time. c.Change X Alignment to Percent(%) and set X Location (%): 39. d.Y Location (%): 14. e.Font Size: 18. f.Click on Apply. g.Modify / Legend. h.Title: ND. i.Click on Apply. a b c d e f g h i

WS17-42 PAT301, Workshop 17, October 2003 Step 13. Customize the Appearance of the XY Plot (Cont.) Continue to customize the appearance of the XY plot a.Modify / Axis. b.Active Axis: X. c.Scale… d.Assignment Method: Range. e.Enter 0.0, 3.0 for Lower and Upper Values. f.Enter 10 for Number of Primary Tick Marks. g.Click on Apply. h.Click on Cancel. i.Tick Marks… j.Check both Primary and Secondary for Display. k.Click on Apply. l.Click on Cancel. m.Grid Lines… n.Check both Primary and Secondary for Display. o.Click on Apply. p.Click on Cancel. a b c d e f g h i j k l m

WS17-43 PAT301, Workshop 17, October 2003 Step 13. Customize the Appearance of the XY Plot (Cont.) Continue to customize the appearance of the XY plot. a.Active Axis: Y. b.Title… c.Axis Title: Displ, Trans. d.Click on Apply. e.Click on Cancel. f.Tick Marks… g.Check both Primary and Secondary for Display. h.Click on Apply. i.Click on Cancel. j.Grid Lines… k.Check both Primary and Secondary for Display. l.Click on Apply. m.Click on Cancel. a b c de f

WS17-44 PAT301, Workshop 17, October 2003 This ends this exercise. Exit MSC.Patran a.File / Close. Step 13. Customize the Appearance of the XY Plot (Cont.)