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Structural Dynamics Input Files (29 entries)
 
CLOSED_TANK
  Sheldon Imaoka (ANSYS, Inc.)
  Comparison of FLUID30 (acoustic fluid element) and FLUID80 (contained fluid element) for sloshing in a tank.
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Average Rating: 10.0 (22 votes)  
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CYC_PRINC
  Christian Semler (Mechanical Dynamics Ltd.)
  "Here is an input file which computes principal stresses for a particular sector from a cyclic symmetry analysis, on all corner nodes, without using the /CYCEXPAND command. This enables the use of the *VGET command, so further manipulations are possible."
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Average Rating: 9.3 (120 votes)  
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HARM_FULL_EX
  David Haberman (CSI)
  Direct displacement method (full harmonic with applied displacment).
Modal analysis then frequency sweep.
Results are scaled to get acceleration, displacement, and g's vs frequency.
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Average Rating: 9.8 (44 votes)  
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HARM_LMM
  David Haberman (CSI)
  Harmonic linear Sweep Example. Modal super position with the large mass method was the solution technique.
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Average Rating: 10.0 (15 votes)  
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HARM_LMM_CLUST
  David Haberman (CSI)
  Harmonic linear Sweep Example. Modal super position with the large mass method was the solution technique. The cluster option was used to allow for enough resolution around the natural freq.
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Average Rating: 10.0 (11 votes)  
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HARM_LMM_SPEC
  David Haberman (CSI)
  Harmonic Log Sweep Example. Allows a user to input varibles that are consistent with design spec. Modal super position with the large mass method was the solution technique.
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Average Rating: 10.0 (14 votes)  
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HARMC_EMM
  Mohammad Gharaibeh (State University of New York at Binghamton)
  Example of a harmonic response analysis (linear sweep) of a plate using mode-superposition method with enforced motion.
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Average Rating: 10.0 (3 votes)  
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HARMONIC_AND_RANDOM
  Sheldon Imaoka (ANSYS, Inc.)
  This zip file contains a simple example - single input PSD table for base excitation of a fictitious structure - run as both random vibration and harmonic response analyses.
The user can review the contents of the two input files and see how one can relate harmonic analyses (the transfer function) to the response PSD in random vibration analyses. (Actually, one can also look it up in any dynamics textbook, but this just shows how one can do it in ANSYS.)
(See also TFUN undocumented command to get the transfer function after a random vibration analysis.)
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Average Rating: 8.0 (10 votes)  
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HARMONIC_CMS
  Sheldon Imaoka (ANSYS, Inc.)
  Simple beam example showing procedure for using CMS (component mode synthesis). Same results for the full model (no CMS) and the CMS model.
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Average Rating: 10.0 (2 votes)  
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PLATE_CMS
  Sheldon Imaoka (ANSYS, Inc.)
  Example showing how to use CMS (component mode synthesis) with Response Spectrum analysis (single-point response spectrum).

The non-superelement ("full model") input is here, so you can compare the results to see that they are essentially the same.
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Average Rating: 7.5 (2 votes)  
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RESVEC
  Sheldon Imaoka (ANSYS, Inc.)
  This input file is a simple demonstration of the usefulness of the residual vector method in capturing accurate higher-frequency response in mode-superposition analyses.
In the input file, change the first two parameters as follows:
  • For results with many modes included and no residual vector, set MY_FREQUENCY = 1 and MY_RESVECTOR = 0
  • For results with few modes included and no residual vector, set MY_FREQUENCY = 0 and MY_RESVECTOR = 0
  • For results with few modes included and with residual vectors, set MY_FREQUENCY = 0 and MY_RESVECTOR = 1
By performing the above, one will see that even at the higher-frequency response, the residual vector method will give results comparable to including many modes even if the user has a smaller set of modes. An Excel spreadsheet is also available, which tabulates the results (notice the difference in results for higher frequencies - this is where, without residual vector method and fewer modes, one may not accurately capture higher-frequency response).
Note that the residual vector method includes stiffness of higher frequencies, but one should still have enough modes to characterize the mass of the structure (i.e., it's not a panacea for insufficient modes). Also, use of ANSYS 11.0 or higher is required.
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Average Rating: 9.3 (7 votes)  
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REVOLVE
  Sheldon Imaoka (ANSYS, Inc.)
  Simple example showing a disk loaded with initial velocity. Disk rotation is defined by MPC184, so this must be run in version 7.0 and above. (Disk rotation could have been defined by other methods such as deformable-rigid contact, but this was meant to illustrate a particular technique.)
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Average Rating: 9.7 (39 votes)  
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RV_BA
  David Haberman (CSI)
  Example of random vibration, base acceleration.
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Average Rating: 8.8 (29 votes)  
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RV_BA_MP
  David Haberman (CSI)
  Example of random vibration, base acceleration in two directions.
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Average Rating: 6.7 (18 votes)  
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RV_LMM
  David Haberman (CSI)
  Example of random vibration, large mass method.
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Average Rating: 10.0 (8 votes)  
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RV_NF
  David Haberman (CSI)
  Example of random vibration, nodal forces.
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Average Rating: 8.2 (11 votes)  
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RV_PRESS_FM
  David Haberman (CSI)
  Example of random vibration, pressure loading.
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Average Rating: 7.8 (9 votes)  
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RV_PRESS_RM
  David Haberman (CSI)
  Example of random vibration, pressure loading (reduced modal).
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Average Rating: 10.0 (8 votes)  
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SPEC_ACC
  David Haberman (CSI)
  Example of running a sprectrum analysis in ANSYS.
Acceleration Sprectrum.
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Average Rating: 8.7 (16 votes)  
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SPEC_ACC_VEL_MPT
  David Haberman (CSI)
  Example of running a sprectrum analysis in ANSYS.
Multipoint input sprectrum (acceleration and velocities).
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Average Rating: 7.7 (11 votes)  
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SPEC_PULSE2
  David Haberman (CSI)
  User can modify the 1/2 sine input amplitude and duration.
ANSYS will calculate the fft and give you an input spectrum for later use in a spectrum analysis.
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Average Rating: 8.7 (15 votes)  
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SPRS_MPRS
  Sheldon Imaoka (ANSYS, Inc.)
  The attached zip file includes a simple example demonstrating the procedure to perform a single-point response spectrum (SPRS), where the excitation in 3 direction is applied together (using SRSS combination), not independently.
The procedure for multi-point response spectrum (MPRS) is included as well for the same situation.
An Excel spreadsheet shows that the results obtained for this simple model is the same for both methods (compare the mode coefficients for each squared mode in the spreadsheet).
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Average Rating: 9.6 (14 votes)  
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TR_LMM_ACC_MSPT
  David Haberman (CSI)
  Structural Transient
Modal Superposition
Large Mass Method
Acceleration vs. Time Acceleration:f=ma

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Average Rating: 8.2 (19 votes)  
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TR_LMM_ACC_MSPT_2
  David Haberman (CSI)
  Structural Transient
Pre-Stressed Modal Superposition
Large Mass Method
Acceleration vs. Time Acceleration:f=ma

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Average Rating: 10.0 (9 votes)  
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TR_LMM_ACC_MSPT_SIN
  David Haberman (CSI)
  Example of a transient modal supperposition
Large mass method applying acceleration vs. time
1/2 sine wave with 75 g peak over .006 sec

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Average Rating: 9.4 (16 votes)  
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TR_LSM_EL_MSPT
  David Haberman (CSI)
  Structural Transient, mode superposition method
Element pressure vs. Time

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Average Rating: 9.3 (7 votes)  
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TR_LSM_F_MSPT
  David Haberman (CSI)
  Structural Transient, mode superposition method
Nodal forces vs. Time

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Average Rating: 10.0 (8 votes)  
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TR_LSM_PRESS_FT
  David Haberman (CSI)
  Structural Transient, full method
Element pressure vs. Time applied as load steps

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Average Rating: 10.0 (11 votes)  
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TR_TB_PRESS_FT
  David Haberman (CSI)
  Structural Transient, full method
Element pressure vs. Time applied as tabular load

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Average Rating: 9.3 (35 votes)  
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