Change log#

VERSION 2.0

  • 2.0.0 (2026/05)

    • Logging: Replaced Boost dependency with spdlog; migrated all messages to a structured plog system; split user-facing and developer log streams; added a write guard for log initialization.

    • CLI: Added --nopopup argument to suppress the Gmsh popup window; added --gmsh-verbosity to control Gmsh log noise; the analysis-mode flags are now long-form (--hm, --dh, --fi, --fs, --fe); the solver flags became --vabs / --sc and the integrated solver toggle is --integrated.

    • Geometry: Refactored core geometry classes (PDCELVertex, baseline, segment, offset, join); rewrote the DCEL (doubly connected edge list) module; refactored build-segment-area and join-segments logic.

    • IO: Refactored input/output module; added exception handling and loop guard for malformed input; fixed parsing of multiple numbers separated by multiple spaces; fixed parsing of p1, p2, p3 fields; type="lamina" is no longer accepted as a material symmetry type — use type="transversely isotropic" instead; <lamina> is now used only for material+thickness definitions; fixed the layups include block.

    • Elements: Added support for quadrilateral element type via <element_shape> and the associated transfinite/recombine controls.

    • Bug fixes: Fixed point placement on airfoil line; fixed 2-cell construction for box cross-sections; fixed MH104 cross-section build; fixed i_web component build; fixed build-component logic; fixed geo/offset/intersect calculations; fixed build warnings.

    • Build: Added Ninja generator support; added Linux bash script for integration tests; fixed Linux build scripts; added Python environment for documentation.

    • Testing: Added Catch2 unit tests for geometry and IO modules; updated and expanded integration test cases.

    • License: Added license file.

VERSION 1.6

  • 1.6.0 (2024/11)

    • Added a new output file after creating the cross-section to store the mapping between material IDs and names.

    • Changed the gmsh linking to the shared library from the SDK.

    • Fixed the issue of being unable to run PreVABS without the VABS dll.

    • Fixed the issue of not reading airfoil data properly on Linux.

    • Fixed the issue of not skipping header rows of airfoil data.

    • Fixed the issue of not being able to run the input without the include block.

VERSION 1.5

  • 1.5.1 (2022/10/27)

    • Fixed the issue of reading result of failure analysis of the new format with an extra line of load case label.

    • Added a new tag name for the root XML element: sg.

    • Added a new input for output model dimension (for SwiftComp only).

    • Updated the writing function for 3D solid model (for SwiftComp only).

    • Changed the Gmsh plot option for strength ratios.

  • 1.5.0 (2022/06/05)

    • Added a new type of line airfoil, which can accept the file name of a standard airfoil data file.

    • Added new arguments for points defined on an airfoil line (which="top" / which="bottom").

    • Added a new function to remove very short edges and very close vertices.

    • Added a new input of length tolerance for edge removal.

    • Added a new input for multiple loading cases for dehomogenization and failure analysis (<case> and <include>).

    • Added a new method to define an arc using two end points and a radius (or curvature).

    • Added a new method to define a line by joining multiple lines (method="join").

    • Set the default line type to straight, which can be omitted now.

    • Fixed the issue of overlapping/duplicated mesh vertices.

VERSION 1.4

  • 1.4.3 (2022/01/11)

    • Fixed the issue of plotting element stress and strain results.

    • Fixed the issue of plotting dehomogenization results with quadratic elements.

    • Added groups for different stress and strain plots.

    • Added alternative tag names for material strength properties.

    • Added visualization for initial failure analysis results.

    • Added a new example for initial failure analysis (ex_uh60a_f).

    • Simplifed and unified material strength inputs for different types of materials.

    • Updated the section of material strength property input in the documentation.

  • 1.4.2 (2021/11/05)

    • Fixed an issue related with layer generation.

  • 1.4.1 (2021/09/01)

    • Fixed an issue in assigning theta1 and theta3 for filling components.

  • 1.4.0 (2021/06/16)

    • Added a new command option to run integrated VABS.

    • Added new inputs for the rotor blade specific parameterization.

    • Added new inputs for strength property of ‘lamina’ type materials.

    • Added new inputs for assigning orientations for filling materials.

    • Added a new input option for recover analysis in VABS. The default is linear beam theory.

    • Added a new input option for setting the tolerance used in geometric computation.

    • Added the capability of failure analysis using VABS.

    • Updated the logging system.

    • Changed the default element type to ‘quadratic’.

    • Unified the input syntax of recovery/dehomogenization of VABS/SwfitComp.

    • Fixed the issue of incorrectly parsing numbers with more than one spaces between numbers.

    • Fixed an issue in transforming an arc defined by center, start and radius.

VERSION 1.3

  • 1.3.0 (2021/02/25)

    • Added a new capability to create base points using normalized parametric locations on a base line.

    • Added a new capability to assign local mesh size for filling components.

VERSION 1.2

  • 1.2.0 (2020/11/10)

    • Added a new capability to create layups from sublayups.

    • Added a new capability to create segments using normalized parametric locations on a base line.

VERSION 1.1

  • 1.1.1 (2020/10/28)

    • Fixed the problem of unable to read recover analysis result files on Linux.

    • Fixed a problem when the segment is too short while the laminate is too thick.

  • 1.1.0 (2020/10/15)

    • Added a new format for the input file. Now baselines and layups data are merged into the main input file, to reduce the number of input files needed.

    • Added a new material type ‘lamina’ accepting four numbers for elastic properties.

    • Added default small numbers for elastic properties for isotropic materials.

    • Updated the fill-type component for non-structural mass.

VERSION 1.0 (2019/07/01)

  • Added capability to create quadratic triangle elements. In the main input file, under the xml element <general>, create a sub element <element_type> and set it to quadratic or 2. Default is linear.

  • Added a new output file *.txt storing all running messages.

  • Changed one of the layup methods tag name from ‘explict list’ (‘el’) to ‘layer list’ (‘ll’).

  • Fixed the crashing issue caused by zero number of layers.

  • Fixed the bug that sectional loads were read and written to the distributed loads when doing recovery using VABS.

  • Fixed the bug that local lamina data does not overwrite global data.

VERSION 0.6 (2018/07/01)

  • Added xml elements in the main input file for various options of VABS/SwiftComp execution.

  • Added xml elements in the main input file for failure analysis of SwiftComp.

  • Added a <basepoints> element in the baseline file. Now for simple shapes, users do not need to use an extra basepoint file, which can still be included for long point list.

  • Added a material database file along with the executable. Now PreVABS will look for materials in this file by default.

  • Changed Gmsh library to dynamic/shared library.

VERSION 0.5 (2018/01/31)

  • Added the capability to create nose mass in an airfoil type cross section.

  • Added the post-processing function to visualize the recovered strains and stresses in Gmsh.

VERSION 0.4 (2017/12/04)

  • Added the capability to read stacking sequence code.

  • Added the parameter to set the number of straight lines to approximate an arc or circle.

  • Changed the Gmsh input file name to *.msh, where * is the cross section name.

VERSION 0.3 (2017/11/27)

  • Updated the manual.

  • Changed the default behaviour of the command with input file specified only to preparing VABS input (without running VABS).

  • Changed the element tag <origin> to <translate>. Now the two numbers in this element moves base points and base lines, instead of the origin.

  • Changed the element tag <rotation> to <rotate>.

  • Changed the ‘level’ of a segment from an element to an attribute, with default 1.

  • Changed the ‘layup_direction’ of a segment from an element to an attribute of the layup, with default ‘right’.

  • Changed the material type ‘engineering constants’ to ‘orthotropic’.

  • Set the default element type as ‘quadratic’.

  • Set the default mesh size to the smallest layer thickness.

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