HyperMesh载荷集解释Nastran.docx

HyperMesh载荷集解释Nastran Nastran In HyperMesh, there are two types of load collectors for Nastran: Specific load collectors with a card image Generic load collectors without a card image Generic load collectors are used to collect loads and constraints for display purposes and to assign an ID to the loads. Specific load collectors are used for specialized loading cards, such as SPCADD, MPCADD, EIGRL, EIGB, EIGC, EIGP, EIGR, FREQ, FREQ1, LOAD, GRAV, RFORCE, and TEMPD. Specific load collectors have card images which can be edited to do the following: Group other load collectors together for simultaneous application in a single subcase Provide special information for a specific analysis type (such as modal analysis) General boundary conditions, such as loads and constraints, should not be collected into specific load collectors. When reading in a Nastran deck, loads that have the same SID are collected into the same load collector. If a load collector already exists in the database with the same SID, one of the following can occur: If overwrite is off (default), the new load collectors ID is offset and all loads in that collector will have a new SID upon export. If overwrite is on, the new load collector replaces the existing load collector. The original load collector and the loads it contains are deleted. Supported Cards DAREA Solver Description Supported Parameters Defines scale (area) factors for static and dynamic loads. DELAY Defines the time delay term in the equations of the dynamic loading function DLOAD Defines a dynamic loading condition for frequency response or transient response problems as a linear combination of load sets defined via RLOAD1 or RLOAD2 entries for frequency response or TLOAD1 or TLOAD2 entries for transient HyperMesh Notes Supported as constraints Supported as constraints response DPHASE Defines the phase lead term in the equation of the dynamic loading function EIGB Defines data needed to perform buckling analysis EIGC Defines data needed to perform complex eigenvalue analysis EIGP Defines poles that are used in complex eigenvalue extraction by the Determinant method EIGR Defines data needed to perform real eigenvalue analysis EIGRL Defines data needed to perform real eigenvalue (vibration or buckling) analysis with the Lanczos method FREQ Defines a set of frequencies to be used in the solution of frequency response problems FREQ1 Defines a set of frequencies to be used in the solution of frequency response problems by specification of a starting frequency, frequency increment, and the number of increments desired FREQ2 Defines a set of frequencies to be used in the solution of frequency response problems by specification of a starting frequency, final frequency, and the number of logarithmic increments desired GRAV Defines acceleration vectors for gravity or other acceleration loading Supported as constraints LOAD Defines a static load as a linear combination of load sets defined via FORCE, MOMENT, FORCE1, MOMENT1, FORCE2, MOMENT2, PLOAD, PLOAD1, PLOAD2, PLOAD4, PLOADX1, SLOAD, RFORCE, and GRAV entries MPCADD Defines a multipoint constraint set as a union of multipoint constraint sets defined via MPC entries. NLPARM Defines a set of parameters for nonlinear static analysis iteration strategy RFORCE Defines a static loading condition due to an angular velocity and/or acceleration RLOAD1 Defines a frequency-dependent dynamic load of the form for use in frequency response problems RLOAD2 Defines a frequency-dependent dynamic excitation of the form for use in frequency response problems SPCADD Defines a single-point constraint set as a union of single-point constraint sets defined on SPC or SPC1 entries TABDMP1 Defines modal damping as a tabular function of natural frequency TABLED1 Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads TABLED2 Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table TABLED3 Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table TABLED4 Defines the coefficients of a power series for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table TABLES1 Defines a tabular function for stress-dependent material properties such as the stress-strain curve (MATS1 entry), creep parameters (CREEP entry) and hyperelastic material parameters (MATHP entry). TABLEST Specifies the material property tables for nonlinear elastic temperature-dependent materials TEMPD Defines a temperature value for all grid points of the structural model that have not been given a temperature on a TEMP entry. TIC Defines values for the initial conditions of variables used in structural transient analysis. Both displacement and velocity values may be specified at independent degrees-of-freedom. This entry may not be used for heat transfer analysis. TLOAD1 Defines a time-dependent dynamic load or enforced motion of the form for use in transient response analysis TLOAD2 Defines a time-dependent dynamic excitation or enforced motion of the form for use in a transient response problem, where TSTEP Defines time step intervals at which a solution will be generated and output in transient analysis TSTEPNL Defines parametric controls and data for nonlinear transient structural or heat transfer analysis. TSTEPNL is intended for SOLs 129, 159, and 99.