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New Features in PERMAS Version 12

New in Version 12

The new Version 12 of PERMAS is the result of about 24 months development work. For a complete and detailed overview on changes, a Software Release Note is shipped with Version 12.
Great effort has also been spent in the past years to provide with VisPER (i.e. Visual PERMAS) a dedicated tool to improve pre- and post-processing for special PERMAS functions.

PERMAS V12 offers again improved computing performance:
  • Improved reordering algorithm,
  • new storage scheme for sparse matrices and faster matrix operations,
  • large improvements for contact analyses with friction (see module CAX),
  • faster direct frequency response for coupled FS analyses (see module FS),
  • much faster modal frequency response for fluid analyses or coupled FS calculations using an iterative solver option (see module FS),
  • faster matrix input (in ASCII and binary format),
  • energy computation is now possible without elemental displacements.
Major extensions
  • The new module NLD is an entry point to nonlinear dynamics supporting transient analysis under material nonlinearities, where large translations of elastic bodies are taken into account.
  • Bolt pretension: A generalized concept for pretension of bolts has been implemented. Beside the classical approach using a cutting plane with pretension in normal direction, a new approach using cylindrical thread coupling with pretension in axial direction is available. This highly innovative feature offers a convenient definition which can take into account the detailed effects of radial spreading and axial torque caused by the thread's flank and pitch geometry without the need of modeling the flank shape or thread line explicitly (see module CA).
  • Cyclic symmetry: cyclic symmetric structures can now be handled directly for static analysis with matching cyclic symmetric loads and real eigenvalue analysis (see modules LS and DEVX). There, the analysis of the whole structure is replaced by a series of analysis for one sector with different boundary conditions.
  • Rotor dynamics is improved in the inertial reference frame. The rotating axisymmetric structure can now be elastic. Hence, additional gyroscopic and stiffness terms are provided. As with the co-rotating reference frame an automatic sweep to get a Campbell diagram is available.
  • Generation and use of matrix models has been improved for static and dynamic applications. Beside the generation of damping on subcomponent level, additional options are available to facilitate the backtransformation of results.
  • More extension to Contact Analysis (Module CA):
    • A calculated contact state can be locked for subsequent analyses. This locking leads to a linearization of the contact problem around the current contact state. To achieve this, the active contacts are transformed to kinematic constraints. With this new model various kinds of subsequent analyses are possible (like eigenvalue analysis, heat transfer analysis, or submodeling).
    • Additional contact results are automatically provided for the evaluation of saturation and declination of frictional forces, for the verification of pretension definitions, pretension directions, and pretension threads (like flank normal, downhill and pitch direction), and for the evaluation of pretension coupling forces.
    • For efficient calculation of successive contact variants new contact status files are available for easy job recovery and considerable run time reductions.
  • For the calculation of slip forces, prescribed constant velocities can be specified for subsequent friction analysis by module CAX.
  • Extensions to nonlinear static analysis (module NLS).
    • A new analysis feature allows to perform a material nonlinear analysis of inertia relief cases.
    • A new solver (following the approach of Thomas) is available which accelerates the nonlinear analysis under certain conditions.
    • Nonlinear static analysis is possible using substructuring.
    • A new viscoplastic material is available.
    • Additional results are provided for the verification of initial strains and element temperatures.
  • An automatic surface coarsening procedure supports computation of viewing factors in heat exchange by radiation for very large models (with millions of radiation elements; see module NLHT).
  • Generalized modal condensation is available to establish system matrices in modal space for external applications (module DEVX).
  • A new solver option for modal time history analysis is available: The Newmark beta algorithm is extended to HHT (Hilber-Hughes-Taylor) algorithm. This algorithm introduces an algorithmic damping effect which increases with frequency (see module DRA and FS).
  • Addtional static mode shapes can now be specified in subcomponents, too (see static mode shapes in module DRA). In assembled situations additional static mode shapes can be applied for multiple loading conditions in modal frequency response analysis and will lead to much shorter run times for large mode sets.
  • Extensions to design optimization (module OPT).
    • Linear heat transfer is supported with convectivity coefficient as design parameter and temperature as new design constraint.
    • Incompatible meshes are also supported and allow the optimization of supports in static and dynamic analysis without mesh modifications.
    • Shape optimization has been simplified by specifying surface normals as optimization directions.
  • Extensions to topology optimization (module TOPO).
    • A minimum wall thickness for release directions can be used to keep a box closed.
    • Symmetry conditions for planar, axial, and cyclic symmetry are supported.
    • A new filter is available which allows for maximum membersize definitions.
  • Reliability analysis can now be used with contact analysis and load history. Also, modal frequency response analysis can be used with reliability analysis (see module RA).
New Elements
  • A new linear control element with eight nodes is available.
  • A new eight node controller is also available as user programmable element where the user has to provide element stiffness and viscous damping matrices via subroutine.
  • A point plot element (to represent mass elements).
Some element extensions
  • The main mass elements support direct input of mass matrix.
  • Fluid-structure coupling elements can now be used to provide the result item sound radiation power density.
  • Solid elements (in 3D), gasket elements, line and point plot elements may have geometrical properties assigned which allows for a more convenient model handling in post-processors that need property data for a model partitioning.
Minor extensions
Many smaller extensions of almost all functional modules had been performed in addition. Moreover, all interfaces were updated and adapted to the new functionalities. Major interface enhancements are:
  • Medina
    • Unterstützung von MEDINA 8.0,
    • Support of new contact menus,
    • Export of surfaces and isurfaces to MEDINA,
    • of grid point forces for welding connections,
    • Export of new PERMAS Version 12 results.
  • Hyperview
    • Support of HyperView 8.0 Libraries.
    • Support of transient nonlinear heat transfer analysis.
  • ADAMS (AD)
    • Support of MNF library ADAMS 2007 r1.
  • Virtual.Lab (VLAB)
    • Support of new weldspot model.
    • Stress resultants as results.

For all system platforms an update to the current release of the operating system had been performed.