Load Steps
Load step entities define and store load cases for a given analysis.

Load steps are defined by selecting associated load collectors and output blocks.
Abaqus Cards
Card | Description |
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*ADAPTIVE MESH | Defines an adaptive mesh domain and specifies the frequency and intensity of
adaptive meshing for that domain. 注: Defined in the load step card image.
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*BUCKLE | Obtain eigenvalue buckling estimates. 注: Defined in the load step card image.
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*BULK VISCOSITY (Explicit) |
Modify bulk viscosity parameters. 注: History data.
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*COUPLED TEMP-DISPLACEMENT | Analyze problems where the simultaneous solution of the temperature and
stress/displacement fields are necessary. 注: Defined in the load step card image.
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*DYNAMIC (Explicit) |
Dynamic stress/displacement analysis. 注: Defined in the load step card image.
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*DYNAMIC (Standard) |
Dynamic stress/displacement analysis. 注: Defined in the load step card image.
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*FILE FORMAT | Specify format for results file output and invoke zero-increment results file
output. 注: Defined in the load step card image.
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*FREQUENCY | Extract natural frequencies and modal vectors. 注: Defined in the load step
card image.
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*GEOSTATIC | Verify that the geostatic stress field is in equilibrium with the applied loads and boundary conditions on the model and to iterate, if needed, to obtain equilibrium. |
*HEAT TRANSFER | Transient or steady-state uncoupled heat transfer analysis. 注: Defined in
the load step card image.
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*LOAD CASE | Begin a load case definition for multiple load case analysis. 注: Defined in
the load step card image.
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*MODAL DYNAMIC | Dynamic time history analysis using modal superposition 注: Defined in the
load step card image.
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*MONITOR | Define a degree of freedom to monitor. 注: Defined in the load step card image.
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Request or suppress output to the message file in an Abaqus/Standard analysis or to the status file in an Abaqus/Explicit analysis. 注: Defined in the load step
card image.
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*RADIATION_ VIEWFACTOR | Control the calculation of viewfactors during a cavity radiation
analysis. 注: Defined in the load step card image;
visible in *Heat Transfer analysis procedure.
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*RESPONSE SPECTRUM | Calculates estimates of peak values of nodal and element
responses. 注: Defined in the load step card image.
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*RESTART WRITE | Save and reuse data and analysis results. 注: Defined in the load step
card image.
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*STATIC | Static stress/displacement analysis. 注: Defined in the load step card image.
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*STEADY STATE DYNAMICS | Steady-state dynamic response based on harmonic excitation. 注: Defined in
the load step card image.
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*STEP | Begin a step. 注: Parameters are defined in the load step card image.
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*VISCO | Transient, static, stress/displacement analysis with time-dependent material
response (creep, swelling, and viscoelasticity) 注: Defined in the load step
card image.
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ANSYS Cards
Card | Description |
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ACEL | Specifies the linear acceleration of the structure. |
ANTYPE | Specifies the analysis type and restart status. |
CECMOD | |
CMACEL | Specifies the translational acceleration of an element component. |
CMDOMEGA | Specifies the rotational acceleration of an element component about a user-defined rotational axis. |
CMOMEGA | Specifies the rotational velocity of an element component about a user-defined rotational axis. |
EQSLV | Specifies the type of equation solver. |
LSSOLVE | Reads and solves multiple load steps. |
NLGEOM | Includes large-deflection effects in a static or full transient analysis. |
NSUBST | Specifies the number of substeps to be taken this load step. |
OMEGA | Specifies the rotational velocity of the structure. |
OUTRES | Controls the solution data written to the database. |
TIME | Sets the time for a load step. |
Nastran Cards
Load step entities directly correspond to Nastran subcase definitions.
Card | Description |
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ANALYSIS | Used in the I/O Options section to request that only a finite element analysis be performed (optimization input is ignored). 入出力オプションまたはサブケース情報のセクション内で使用して、すべてまたは個々のサブケースの解析タイプをそれぞれ識別することもできます。 残りのオプションは、下記に説明するようにANALYSISコマンドの解析タイプ識別機能を示します。
注: Subcase Information Entry
Enable the subcase option ANALYSIS and then select an analysis type. |
ANALYSIS Type | Subcase selections will displayed based on the analysis type selected. ANALYSIS I/O option with type is set in Subcase options. 注: I/O Options Entry
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BCONTACT | This entry is used to initiate and control which bodies come into contact in SOLs 101, 400. |
CMETHOD | The CMETHOD command can be used in the Subcase Information section to select the method for complex eigenvalue extraction. 注: Subcase Information Entry
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DEFORM | The DEFORM command can be used in the Subcase Information section to select an element deformation set. 注: Subcase Information Entry
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DLOAD | Selects a dynamic load to be applied in a transient and frequency response analysis subcase. DLOADコマンドを使用して、非線形静解析サブケースで適用されるユーザー定義の荷重曲線を選択することもできます。 注: Subcase Information Entry
Enable the subcase definition DLOAD and select load collectors with dynamic loading information (DLOAD, RLOAD1, RLOAD2, TLOAD1, TLOAD2). |
FREQUENCY | Selects the set of forcing frequencies to be solved in a frequency response problem. 注: Subcase Information Entry
Enables you to select load collectors with frequency information (FREQ, FREQ1, FREQ2, FREQ3, FREQ4, FREQ5). |
IC | Selects initial conditions for Transient and Explicit Analysis. |
LABEL | Provides a subcase with a label. 注: Subcase Information Entry
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LOAD | Selects a static load set to be applied in linear static solutions. 注: Subcase Information Entry
Enables you to select load collectors with static load information (FORCE, MOMENT, PLOAD, PLOAD2, PLOAD4, LOAD), or inertial loading information (GRAV, RFORCE). |
METHOD | Selects a method for real eigenvalue extraction. 注: Subcase Information Entry
Select load collectors with an EIGRL card image for METHOD(STRUCT) or METHOD(FLUID). |
MFLUID | Selects the MFLUID Bulk Data entries to be used to specify the fluid-structure interface 注: Bulk Data Entry
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MPC | Selects a multi-point constraint set. 注: Subcase Information Entry
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NLPARM | Activates nonlinear solution methods for this subcase and to select the parameters used for Nonlinear Quasi-static Analysis, Geometric Nonlinear Implicit Analysis, and Nonlinear Direct Transient Analysis. 注: Subcase Information Entry
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NLSTEP | Describes the control parameters for mechanical, thermal and coupled analysis in SOL 400 and for linear contact analysis in SOL 101. |
NONLINEAR | The NONLINEAR command can be used in the Subcase Information section to select a nonlinear dynamic load set for direct transient analyses 注: Subcase Information Entry
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RGYRO | Includes data required to perform Rotor Dynamics analysis in Modal Frequency Response Analysis and/or Modal Complex Eigenvalue Analysis. RGYROバルクデータエントリは、特定のサブケース内の対応するRGYROサブケース情報エントリによって参照されます。 注: Bulk Data Entry
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RSDAMP | Requests parameter and hybrid damping for the residual structure. |
SDAMPING | Applies modal damping as a function of natural frequency in modal solutions. 注: Subcase Information Entry
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SPC | Selects a single-point constraint set. 注: Subcase Information Entry
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STATSUB | Selects a static solution subcase. 注: Subcase Information Entry
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SUBCASE | Indicates the start of a new subcase definition. 注: Subcase Information Entry
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SUBCOM | Defines a combination subcase. 注: Automatically created when a new load
step of type “Combination Subcase Delimiter” is created. The SUBCOM ID matches
the ID of the HyperMesh load step
entity.
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SUBSEQ | Subcase sequence coefficients. 注: Only available for Combination Subcase
Delimiter load steps.
Enable SUBSEQ to input combination coefficients. |
SUBTITLE | Defines the subtitle for all subcases or for individual subcases, respectively. |
SUPORT1 | Selects a fictitious support set to be applied to the model. 注: Subcase Information Entry
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TEMP | Defines temperature at grid points or a SET of grid points for determination of Thermal Loading and Stress recovery. |
TITLE | Defines a character string to appear on the first heading line of each page of MSC Nastran printer output. |
TRIM | Selects trim variable constraints in static aero-elastic response. |
TSTEP | Selects integration for transient analysis. 注: Subcase Information Entry
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TSTEPNL | Defines parametric controls and data for nonlinear transient structural or heat transfer analysis. |
OptiStruct Cards
Loadsteps directly correspond to OptiStruct subcases. Load steps can reference static loads (LOAD), constraints (SPC), and dynamic loads (DLOAD).
Supported card parameters are dependent upon the selected analysis type (solution sequence).
Card | Description |
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ACCELERATION | Requests acceleration vector output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select ACCELERATION. |
ANALYSIS | Used in the I/O Options section to request that only a finite element analysis be performed (optimization input is ignored). 入出力オプションまたはサブケース情報のセクション内で使用して、すべてまたは個々のサブケースの解析タイプをそれぞれ識別することもできます。 残りのオプションは、下記に説明するようにANALYSISコマンドの解析タイプ識別機能を示します。
注: Subcase Information Entry
Enable the subcase option ANALYSIS and then select an analysis type. |
ANALYSIS Type | Subcase selections will displayed based on the analysis type selected. ANALYSIS I/O option with type is set in Subcase options. 注: Subcase Information Entry
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ASSIGN | Used in the I/O Options section to identify external files and their contents. 注: I/O Options Entry
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CMSMETH | Requests that only a component mode synthesis solution be performed and to select a component mode synthesis method definition to be used. 注: Subcase Information Entry
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CMETHOD | The CMETHOD command can be used in the Subcase Information section to select the method for complex eigenvalue extraction. 注: Subcase Information Entry
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CNTNLSUB | The CNTNLSUB command can be used in the Subcase Information section to continue a nonlinear solution from a preceding nonlinear subcase, and thus create complex loading sequences 注: Subcase Information Entry
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CNTSTB | The CNTSTB command can be used in the Subcase Information section to activate stabilization of surface-to-surface (S2S) contact and large displacement node-to-surface (N2S) contact for this subcase. このコマンドは、微小変位非線形解析でのみ使用されます。 注: Subcase Information Entry
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CSTRAIN | Requests ply strain output for elements referencing PCOMP, PCOMPP or PCOMPG properties for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select CSTRAIN. |
CSTRESS | Requests ply stress output for elements referencing PCOMP, PCOMPP or PCOMPG properties for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select CSTRESS. |
DEFORM | The DEFORM command can be used in the Subcase Information section to select an element deformation set. 注: Subcase Information Entry
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DESOBJ | Selects a single response definition as the objective function of an optimization, or to select system response definitions when the objective function is the least squares sum of these definitions. この応答を最小化するか、それとも最大化するかも、DESOBJコマンドで指定します。 注: Subcase Information Entry
Part of the optimization problem setup, created when you define an objective. |
DESSUB | Used within a subcase definition, to select a constraint set that is subcase dependent. 注: Subcase Information Entry
Part of the optimization problem setup, created when you define a dconstraint. |
DISPLACEMENT | Requests displacement vector output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select DISPLACEMENT. |
DLOAD | Selects a dynamic load to be applied in a transient and frequency response analysis subcase. DLOADコマンドを使用して、非線形静解析サブケースで適用されるユーザー定義の荷重曲線を選択することもできます。 注: Subcase Information Entry
Enable the subcase definition DLOAD and select load collectors with dynamic loading information (DLOAD, RLOAD1, RLOAD2, TLOAD1, TLOAD2). |
EIGVRETRIEVE | Retrieves eigenvalue and eigenvector results of a Normal Modes Analysis from an external data file (.eigv). 注: Subcase Information Entry
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EIGVSAVE | Outputs eigenvalue and eigenvector results of a Normal Modes Analysis to an external data file (.eigv). 注: Subcase Information Entry
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ELFORCE | Requests structural element force output and elemental fluid particle velocity output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select ELFORCE. |
ENDLOAD | The ENDLOAD command can be used in the I/O Options or Subcase Information sections to request End Load output for all edges for relevant subcases or individual subcases respectively. 注: I/O Options and Subcase Information
Entry
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ERP | Requests equivalent radiated power output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select ERP. |
ESE | Requests strain energy and strain energy density output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select ESE. |
EXCLUDE | Selects a set of elements to be excluded from a Linear Buckling Analysis. Enable the subcase option OUTPUT to select EXCLUDE, then select a SET definition. 注: Subcase Information Entry
Enable the subcase option OUTPUT to select EXCLUDE, then select a SET definition. |
FATDEF | Selects a FATDEF Bulk Data Entry that will define the elements, and their associated fatigue properties, to be considered for Fatigue Analysis. 注: Subcase Information Entry
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FATPARM | Selects a FATPARM Bulk Data Entry that will define the parameters to be used for a Fatigue Analysis. 注: Subcase Information Entry
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FATSEQ | Indicates that a subcase is a fatigue analysis subcase and to select a FATSEQ Bulk Data Entry that will define the loading sequence for the Fatigue Analysis. 注: Subcase Information Entry
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FLLWER | The FLLWER command can be used in the Subcase Information section to activate updating the node forces introduced by a pressure load. 注: Subcase Information Entry
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FREQUENCY | Selects the set of forcing frequencies to be solved in a frequency response problem. 注: Subcase Information Entry
Enables you to select load collectors with frequency information (FREQ, FREQ1, FREQ2, FREQ3, FREQ4, FREQ5). |
FSI | Identifies a FSI Bulk Data Entry to run Fluid-Structure Interaction Analysis with Altair AcuSolve for a Linear Transient Heat Transfer Subcase or Nonlinear Direct Transient Analysis Subcase. 注: Bulk Data Entry
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GLOBSUB | Selects a subcase that references the global structure for Local-Global Analysis and a set of grid points in the local structure that defines the cut surface for displacement. 注: Subcase Information Entry
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GPFORCE | Requests grid point force balance output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select GPFORCE. |
GPSTRESS | Requests grid point stresses output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select GPSTRESS. |
IC | Selects initial conditions for Transient and Explicit Analysis. 注: Subcase Information Entry
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INVEL | Selects a multibody initial velocity set to be applied in a multibody problem. 注: Subcase Information Entry
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LABEL | Provides a subcase with a label. 注: Subcase Information Entry
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LOAD | Selects a static load set to be applied in linear static solutions. 注: Subcase Information Entry
Enables you to select load collectors with static load information (FORCE, MOMENT, PLOAD, PLOAD2, PLOAD4, LOAD), or inertial loading information (GRAV, RFORCE). |
LOADJG | Used in the Subcase Information section to select a load set to be applied to joints which are defined via the JOINTG Bulk Data Entry. 注: Subcase Information Entry
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MBSIM | Selects a Multibody simulation definition to be applied in a Multibody problem. 注: Subcase Information Entry
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METHOD | Selects a method for real eigenvalue extraction. 注: Subcase Information Entry
Select load collectors with an EIGRL card image for METHOD(STRUCT) or METHOD(FLUID). |
MFLUID | Selects the MFLUID Bulk Data entries to be used to specify the fluid-structure interface 注: Bulk Data Entry
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MLOAD | Selects a Multibody load set to be applied in a Multibody problem. 注: Subcase Information Entry
Enables you to select load collectors with multi-body dynamic load information (GRAV, MBFRC, MBFRCC, MBMNT, MBMNTC, MLOAD). |
MODCHG | The MODCHG command can be used to remove and/or reactivate contact interfaces and/or elements for this subcase. このコマンドは、非線形解析でのみ使用されます。 注: Subcase Information Entry
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MODESELECT | The MODESELECT command can be used in the I/O Options or the Subcase Information section to select a subset of computed modes in modal dynamic analysis subcases. 注: I/O Options or Subcase Information
Entry
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MODEWEIGHT | Defines a multiplier for computed eigenvalues that are to be used in the calculation of the "weighted reciprocal eigenvalue" and "combined compliance index" optimization responses. 注: Subcase Information Entry
Part of the optimization problem setup, created when you define a response. |
MOTION | Selects a Multibody motion set to be applied in a multibody problem. 注: Subcase Information Entry
Enables you to select load collectors with multi-body dynamic motion information (MOTION, MOTNG, MOTNGC). |
MOTNJG | Used to select the motion applied to corresponding joints. 注: Subcase Information Entry
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MPC | Selects a multi-point constraint set. 注: Subcase Information Entry
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MPCFORCE | Requests multi-point force of constraint vector is output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
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NLADAPT | The NLADAPT entry can be used in the Subcase Information section to select the parameters used for Large Displacement Nonlinear Quasi-static Analysis, Small Displacement Nonlinear Quasi-Static Analysis, and Nonlinear Transient Analysis. 注: Subcase Information Entry
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NLMON | This NLMON Subcase Information Entry can be used to activate Nonlinear Monitoring for a subcase by referencing a corresponding NLMON Bulk Data Entry. 注: Subcase Information Entry
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NLOAD | The NLOAD command can be used in the Subcase Information section to select a time dependent load to be applied in Explicit Dynamic Analysis problem. 注: Subcase Information Entry
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NLOUT | The NLOUT entry can be used in the Subcase Information section to select the incremental result output parameters used for Nonlinear Static Analysis and Nonlinear Transient Analysis. 注: Subcase Information Entry
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NLPARM | Activates nonlinear solution methods for this subcase and to select the parameters used for Nonlinear Quasi-static Analysis, Geometric Nonlinear Implicit Analysis, and Nonlinear Direct Transient Analysis. 注: Subcase Information Entry
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NSM | Selects a non-structural mass set for mass generation. この選択コマンドは、最初のSUBCASEステートメントより前に指定する必要があります。 注: Subcase Information Entry
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OFREQUENCY | Requests a set of frequencies for output requests for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select OFREQUENCY. |
OLOAD | Requests the form of applied load vector output and temperature load output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select OLOAD. |
OMODES | Requests a set of modes for output requests for all subcases or for individual subcases, respectively. このコマンドは、ノーマルモードおよび線形座屈解析タイプにのみ適用されます。 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select OMODES. |
PEAKOUT | Defines criteria used for the automatic identification of loading frequencies at which result peaks occur. これによって、これらの“ピーク”加振周波数で他の結果出力も要求できます。この機能は、周波数応答解析タイプでのみサポートされます。 注: Subcase Information Entry
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PFGRID | Requests output of acoustic grid participation factors for all Modal Frequency Response subcases. 出力は.h3dファイルです。 注: I/O Options Entry
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PFMODE | Requests output of modal participation factors for all modal frequency response subcases. 注: I/O Options Entry
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PFPANEL | Requests output of acoustic panel participation factors for all Modal Frequency Response subcases. 注: I/O Options Entry
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POST | Used to request subcase-specific output to separate files. 注: Subcase Information Entry
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PRETENSION | The PRETENSION command can be used in the Subcase Information section to select and activate a pretensioning bolt load. 注: Subcase Information Entry
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RADSND | The RADSND command can be used in the Subcase Information section to select RADSND Bulk Data to specify sound generation panels and microphone field locations. 注: Subcase Information Entry
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RANDOM | Selects the RANDPS and RANDT1 Bulk Data Entries to be used in Random Response Analysis. 注: Bulk Data Entry
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REQUEST | Selects a multibody request definition to be used in a multibody problem. 注: I/O Options Entry
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RESVEC | Controls the calculation of residual vectors. 注: Subcase Information Entry
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RGYRO | Includes data required to perform Rotor Dynamics analysis in Modal Frequency Response Analysis and/or Modal Complex Eigenvalue Analysis. RGYROバルクデータエントリは、特定のサブケース内の対応するRGYROサブケース情報エントリによって参照されます。 注: Bulk Data Entry
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RSPEC | References combination rules, excitation degrees-of-freedom, and input spectra for use in response spectrum analysis. 注: Subcase Information Entry
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RWALL | Selects rigid walls for geometric nonlinear analysis. 注: Subcase Information Entry
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SDAMPING | Applies modal damping as a function of natural frequency in modal solutions. 注: Subcase Information Entry
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SOLVTYP | Defines the solver type to be used for static, dynamic analysis and geometric nonlinear implicit analysis. 注: Bulk Data Entry
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SPC | Selects a single-point constraint set. 注: Subcase Information Entry
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SPCFORCES | Requests single-point force of constraint vector output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
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STATSUB | Selects a static solution subcase. 注: Subcase Information Entry
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STRAIN | Requests strain output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select STRAIN. |
STRESS | Requests stress output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select STRESS. |
SUBCASE | Indicates the start of a new subcase definition. 注: Subcase Information Entry
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SUBCOM | Delimits and identifies a combination subcase. 注: Subcase Information Entry
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SUBMODEL | Selects a submodel as a set of elements. 選択した要素セット固有のサブケースエントリを使用することで、残りの構造に影響を与えずにサブモデルを解析できます。 注: Subcase Information Entry
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SUBSEQ | Gives the coefficients for forming a linear combination of the previous static subcases. 注: Subcase Information Entry
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SUBTITLE | Defines the subtitle for all subcases or for individual subcases, respectively. |
SUPORT1 | Selects a fictitious support set to be applied to the model. 注: Subcase Information Entry
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TEMP | Defines temperature at grid points or a SET of grid points for determination of Thermal Loading and Stress recovery. |
TSTEP | Selects integration for transient analysis. 注: Subcase Information Entry
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TTERM | Used in a geometric nonlinear subcase to define the termination time. 注: I/O Options and Subcase Information
Entry
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VELOCITY | Requests velocity vector output for all subcases or individual subcases, respectively. 注: I/O Options and Subcase Information
Entry
Enable the subcase option OUTPUT to select VELOCITY. |
WEIGHT | Defines a weighting factor (multiplier) for the compliances of individual linear static solution subcases, which are used in the calculation of the "weighted compliance" and "combined compliance index" optimization responses. 注: Subcase Information Entry
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XHIST | Selects time history output for geometric nonlinear analysis. 注: Subcase Information Entry
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Permas Cards
Card | Description |
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$CONSTRAINTS | Constraint variant bracket header line. 注: Set AnalysisProcedure to
CONSTRAINTS.
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$FREQLOAD | Definition of frequency dependent dynamic loads for use in frequency response
analysis. 注: Only available when AnalysisProcedure is set to
LOADING.
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$LOADING | Loading variant bracket header line. 注: Set AnalysisProcedure to
LOADING.
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$NLLOAD | Define a nonlinear static load history. 注: Only available when
AnalysisProcedure is set to LOADING.
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$SITUATION | Situation definition header line. 注: Set AnalysisProcedure to
SITUATION.
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$TRANSLOAD | Definition of time dependent dynamic loads for use in transient response
analysis. 注: TRANSLOAD cards and FREQLOAD cards are mutually
exclusive.
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