Anisopter

The affordable solution for the rapid sizing of anisogrid structures.

Get a FREE TRIAL code at info@anisopter.com to quickly optimize your favorite cylindrical shell.

TRY DEMO v1.39

Credit: Unknown (from Tokkoro)

Why Anisogrid?

Anisogrid structures are the game-changing technology to save weight, reduce costs, and improve performance in modern spacecrafts and launchers.
Although transition to anisogrid is driven by the 14,000 €/kg of sending payloads to Space, Earth markets will also obtain important savings.




Anisopter

ANISOPTER on Earth

provides important benefits for companies developing high-performance structures where weight and cost efficiency is critical, like towers for electricity transport or wind power generation.


Credit: Stephane_Corvaja (Arianespace) - Vega-VV06 LISA-Pathfinder

Current state of development

ANISOPTER service is being implemented by ezeQ Apps and validated with our collaborator entities.



Credit: ESA-Stephane Corvaja, 2015 (source)

Quick Start

Contact us at info@anisopter.com to get a FREE TRIAL code.

Please, scroll down to test a predefined example or optimize your favorite cylindrical shell.

Basic workflow:

  • 1. Optimize the shell.
  • 2. Adjust optimal dimensions for manufacture. IN TESTS!
  • 3. Online FEA asessment of the model. IN TESTS!
  • 4. Visualize the 3D model and download it. AVAILABLE SOON!


Credit: NASA HQ PHOTO, 2016 (source)

Anisogrid cylindrical shell optimization
Please, select some example to display its technical info.


Anisogrid ribs type
  • Select at least one rib model to perform the optimization.
  • More than one model can be selected to compare with.
  • Including other non-anisogrid design concepts, like tubes or isogrids, is also possible!
(Click this box again to collapse)

Material
  • Once you select the desired material on the drop-down list, all required material properties will be automaticaly loaded.
  • Alternatively, introduce your favorite properties, they will be stored in "Custom material" for further use.
(Click this box again to collapse)


Strength
[MPa]
Stiffness
[GPa]
Density
[kg/m3]

Geometry
  • Length of the cylinder [m].
  • Diameter of the cylinder [m]. Leave this field empty to optimize diameter.
  • Shell thickness [m]. Wall thickness of the cylindrical shell.
  • Tube wall [m]. Wall thickness for tubular ribs ONLY. NOT-AVAILABLE YET!
(Click this box again to collapse)
LengthDiameters [m]Thickness [m]
[m]
Base
Top
Shell
Tube wall

Loads
  • Axial compressive force [N]. Compressive forces are positive.
  • Bending moment [N·m] applied on top. E.g. the bending moment caused by a transverse force or the torque of a wind power generator (both applied on top).
  • Self weight. Check this box to consider the weight of the structure. Important in towers.
  • Lateral wind. ONLY for anisogrids with circular cross-section ribs! You can select Eurocode (EN 1991-1-4:2005) or Hoerner's aerodynamics book 1965 (it is based on pure aerodinamic considerations). Eurocode model is safer.
(Click this box again to collapse)
Axial compressive force [N]
Bending moment [N·m]
Self-weight
Lateral wind

Constraints
  • Shell boundary. Boundary conditions for Euler-buckling of the whole shell.
  • Ribs boundary. Boundary conditions for Euler-buckling of the ribs (local ribs buckling). In Variable boundary conditions, the ribs end-fixity constants depend on neighboring members thickness (ONLY available yet for Rectangular ribs).
  • Axial stiffness. Expresed as minimum axial stiffness [N/m] or as maximum axial displacement [m] allowed.
  • Axial min. frequency [Hz]. Minimum frequecy allowed in the axial direction.
  • Lateral min. frequency [Hz]. Minimum frequecy allowed in the lateral direction.
  • Mass on top [kg]. Mass attached to the free end of the shell. ONLY considered in the Clamped-Free shell boundary conditions (Cantilever beam). If empty, only self-mass will be considered in resonance frequency calculations.
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Shell boundary
Ribs boundary
Axial min. frequency [Hz]
Lateral min. frequency [Hz]
Mass on top [kg]

Advanced options
φ [º]  # Helical ribs  # Hoop ribs
Min
Max
  Min
Max
Step
  Min
Max
Step


*Contact us at info@anisopter.com for a free trial code.

Adjust final geometry
  • Adjust final cylinder dimensions to fulfill manufacturing (or other) constraints.
  • Note that forces, boundary conditions, and other constraints will be taken from optimization form.
(Click this box again to collapse)
Anisogrid ribs type
LengthDiameters [mm]Ribs [#]
[m]
Base
Top
Helical
Hoop
Diameters/Thicknesses [mm]
Helical,
Hoop, or
End ribs
Wall Thicknesses [mm]
Shell
Helical,
Hoop, or
End ribs

Finite Element Analysis
  • Perform a fast Finite Element Analysis to validate the optimized geometry.
(Click this box again to collapse)
Nodes/beam Modes Element Boundary conditions
[#]
[#]
type
Bottom
Top

FEA results will be shown here...