WS10b-1 WORKSHOP 10B FREQUENCY RESPONSE ANALYSIS OF A CIRCUIT BOARD NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation

WS10b-2 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation

WS10b-3 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation FREQUENCY RESPONSE ANALYSIS OF A CIRCUIT BOARD n Problem Description u This workshop is a continuation of Workshop 10a. In this workshop, the user will perform a Frequency Response Analysis and verify the results with the normal modes results from Workshop 10a.

WS10b-4 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation FREQUENCY RESPONSE ANALYSIS OF A CIRCUIT BOARD n Suggested Exercise Steps 1. Open the database called ws10a.db. 2. Create a non-spatial field for the load. 3. Create a time dependent load case. 4. Create the frequency dependent pressure for the plates. 5. Submit the model to MSC.Nastran for analysis using the Restart option. 6. Attach the.XDB results file. 7. Post Process results – create X vs Y graph of displacements. 8. Modify the scale of Y-axis to examine the detail of the plot.

WS10b-5 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 1. File / Open Open the database called ws10a.db. a.File / Open. b.Select ws10a.db. c.Click OK. b c a

WS10b-6 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation e f Step 2. Field: Create / Non Spatial / Tabular Input Create a Non Spatial field for the load. a.Fields: Create / Non Spatial / Tabular Input. b.Enter field for the Field Name. c.Select Frequency (f) as the Active Independent Variable. d.Click Input Data. e.Enter the data shown in the table. f.Click OK. g.Click Apply. a b c d g

WS10b-7 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 3. Load Cases: Create Create a Time Dependent load case. a.Load Cases: Create b.Enter freq_response for the Load Case Name. c.Select Time Dependent as the Load Case Type. d.Click Assign/Prioritize Loads/ BCs. e.Click on the Displ_constraint in the Select Individual Loads/BCs field. f.Click OK. g.Click Apply. b c d e f g a

WS10b-8 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 4. Loads/BCs: Create / Pressure / Element Uniform Create the frequency dependent pressure for the plates. a.Loads/BCs: Create / Pressure / Element Uniform. b.Enter right_side for the New Set Name. c.Switch to 2D for the Target Element Type. d.Click on the Input Data button. e.Enter 4 for Top Surf Pressure, and select field for the Time/Freq. Dependent Field. f.Click OK. g.Click on Select Application Region. h.Change the Geometry Filter to FEM. i.Select the right plate (see Figure 10b-1). j.Click Add, and click OK. k.Click Apply. a b d e f g h i j k j c

WS10b-9 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 4. Loads/BCs: Create / Pressure / Element Uniform (Cont.) Create the frequency dependent pressure for the plates (cont.). a.Loads/BCs: Create / Pressure / Element Uniform. b.Enter left_side for the New Set Name. c.Click on the Input Data button. d.Enter 4 for Bottom Surf Pressure, and select field for the Time/Freq. Dependent Field. e.Click OK. f.Click on Select Application Region. g.Change the Geometry Filter to FEM. h.Select the left plate (see Figure 10b-1). i.Click Add, and click OK. j.Click Apply. a b c d e f g h i j i

WS10b-10 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 4. Loads/BCs: Create / Pressure / Element Uniform (Cont.) Figure 10b-1

WS10b-11 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 5. Analysis: Analyze / Restart / Full Run Submit the model for analysis. a.Analysis: Analyze / Restart / Full Run. b.Select ws10a from the Select an Initial Job field. c.Enter ws10b for the Job Name. d.Click on Solution Type. e.Select FREQUENCY RESPONSE. f.Click OK. a b c d e f

WS10b-12 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 5. Analysis: Analyze / Restart / Full Run (Cont.) Submit the model for analysis (cont.). a.Click on Subcases. b.Enter freq_response for the Subcase Name. c.Select freq_response from the Available Load Cases field. d.Click on Subcase Parameters. a b c d

WS10b-13 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 5. Analysis: Analyze / Restart / Full Run (Cont.) Submit the model for analysis (cont.). a.Click on DEFINE FREQUENCIES. b.Enter the data shown in the table. c.Click OK. d.Select Struct. Damp. (G). e.Click on DEFINE MODAL DAMPING. f.Enter the damping data shown in the table. g.Click OK. h.Click OK. a b c d e f g h

WS10b-14 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 5. Analysis: Analyze / Restart / Full Run (Cont.) Submit the model for analysis (cont.). a.Click Apply. b.Click Cancel. c.Click on Subcase Select. d.Select freq_response and de-select Default. e.Click OK. f.Click Apply. a c d f e b

WS10b-15 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 6. Analysis: Access Results / Attach XDB / Result Entities Attach the XDB result file. a.Analysis: Access Results / Attach XDB / Result Entities. b.Click on Select Results File. c.Select ws10b.xdb. d.Click OK. e.Click Apply. a b c d e

WS10b-16 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 7. Results: Create / Graph / Y vs X Create a X-Y graph of displacement results. a.Results: Create / Graph / Y vs X. b.Click on SC1:FREQ_RESPONSE. c.Select Global Variable as the Filter Method. d.Click Filter. e.Click Apply. f.Click Close. a b c d e f

WS10b-17 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 7. Results: Create / Graph / Y vs X (Cont.) Create a X-Y graph of displacement results (cont.). a.Select Displacement, Translational for the Select Y Result field. b.Select X Component as the Quantity. c.Click on the Target Entities icon. d.Change the Target Entity Selection to Nodes. e.Select Node f.Click Apply. b a c d e f

WS10b-18 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 7. Results: Create / Graph / Y vs X (Cont.)

WS10b-19 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 8. XY Plot: Modify / Axis Modify the scale of Y-axis to examine the detail of the plot. a.XY Plot: Modify / Axis. b.Select Y as the Active Axis. c.Click on the Scale button. d.Select Range. e.Enter as the Lower and Upper Values. f.Click Apply. b a c d e f

WS10b-20 NAS122, Workshop 10b, August 2005 Copyright 2005 MSC.Software Corporation Step 8. XY Plot: Modify / Axis (Cont.)