Program Airloads-V5 :

Object-oriented symbolic algorithm for analysis, design, and dynamic simulation of aero/hydro vehicles , With high-fidelity calculations and a friendly organized graphical interface.

Program Abilities

1 — Two-Dimensional Geometry

• Analytical airfoil coordinates generator for :
  • joukowski airfoils
  • von-Kármán–Trefftz airfoils
  • variable-axis elliptical sections
  • naca one ,four , five and five-reflexed airfoils , standard/modified thickness
  • naca six-series airfoils , standard/modified mean-line
  • built-in library of 1490 different airfoils

• Automatic paneling :
  • uniform spacing
  • half sine spacing
  • full cosine spacing
  • half cosine spacing

• Airfoil inversion (upside-down geometry)

• Export geometry file

2 — Two-Dimensional Solver

• Solution of inviscid, compressible and incompressible potential flow

• Support lifting and non-lifting surfaces

• Thin Airfoil Theory using concentrated trigonometric vortex distributions

• Lumped Vortex Panel Method with vortices located at the quarter-chord

• Constant Source + Vortex Panel Method with surface-distributed sources

• Linear Vortex Panel Method , linearly varying vortex strength per panel

• Aerodynamic results :
  • zero-lift angle of attack
  • center of pressure location
  • lift and pressure drag coefficients
  • airfoil surface pressure distribution
  • moments coefficients , about leading edge and quarter chord

• Parametric variation plots versus angle of attack

• Export geometry and solution

3 — Three-Dimensional Geometry

• High-fidelity symbolic geometry generator for lifting and non-lifting bodies

• Lofted lifting surfaces :
  • different airfoil families on the same wing
  • any number of body/wing and frame/partition per each model
  • independent sweep , dihedral and twist angle per partition
  • independent twist and sweep pivots , each wing has one twist-pivot , while each partition has any sweep pivot

• Ailerons , flaps , elevators, rudders , spoilers and slats

• Trailing vortex wake modeling with multiple extension strategies

• Frame-by-frame construction of complex bodies

• Body-of-revolution generator using parametric curves

• Symbolic and numeric equations inputs

• Unlimited panel count and spacing flexibility

• Options for higher order spline interpolated surfaces

• Parametric geometry variation for optimization studies

• Add , remove , and modify any wing, body, or complete model

• Vortex panels location :
  • chord plane
  • mean cambered surface
  • actual geometric surface
• Automatic calculation of :
  • inertia tensor
  • mean aerodynamic chord
  • center of gravity location

• Output detailed tabulated gemetry
  • Complete model
    • title
    • author
    • center of mass
    • geometry creation time
    • number of lifting surfaces
    • number of non-lifting surfaces
    • reference parameters , span , surface area and mean aerodynamic chord

• • Lifting surfaces
    • wing name and number
    • span and surface area
    • aspect and taper ratio
    • geometric chord
    • number of partitions
    • number of wing panels
    • mean aerodynamic chord
    • bound vortices , control points and load points ordinates
    • corner points coordinates for each panel , surface area and normal vectors

• • Non-lifting surfaces , analytic (numeric/symbolic) or frame-by-frame
    • name
    • number
    • type
    • mass
    • surface area
    • center of mass
    • bound vortices , control points and load points ordinates
    • corner points coordinates for each panel , surface area and normal vectors

• Partition description
  • name
  • number
  • surface area
  • geometric chord
  • aspect and taper ratio
  • mean aerodynamic chord
  • number of partition panels
  • sweep-back angle , about leading edge , quarter chord and about trailing edge
• Frame description
  • name
  • number
  • apex
  • primeter
  • center of mass
  • ordinates
• Export formats :
  • matlab script file (.m)
  • ansys curve file (.dat)
  • matlab binary file (.mat)
  • vlaero input file (.vlp)
  • virtual reality model (.wrl)
  • unigraphics spline file (.dat)
  • usaf-datcom input file (.dcm)

4 — Three-Dimensional Solver

• Subsonic and supersonic flight regimes

• Compressible and incompressible flow fields

• Leading-edge suction analogy for sharp delta wings

• Multi-body and multi-surface aerodynamic interaction

• Wake roll-up with time-stepping relaxation techniques

• Support translational, rotational, and flapping motions

• Shock-wave capturing through wake influence elimintation

• Time domain state-space response due to lateral disturbances

• Mach-cone-based influence matrix correction for supersonic flow

• Sizing and weight estimation for piston and electric driven planes

• Eight different fluids , using height for gases and depth for liquids

• Advanced vortex lattice method for lifting and non-lifting surfaces

• Aeroelastic coupling using Matlab built-in FEA tools programmatically

• Static and accelerated flight performance analysis with load-factor constraints

• Exact and approximate calculations of long and short modes of longitudinal motion

• Distributed loads , sectional forces , static/dynamic stability and control derivatives

• Pure yawing response due to rudder impulse (heading angle and yaw rate) Rudder Impulse

• Stability augmentation system design to damp the pitch rate , angle of attack , yaw rate and heading angle

• Time domain impulsive response and step response due to aileron and/or rudder deflection Lateral Dynamics

• Pitching response due to Elevator Impulse
  • Pitch angle
  • pitch rate
  • angle of attack
  • forward speed

5 — Dynamics Simulation

• Virtual reality world to simulate the six-degree-of-freedom rigid-body equations of motion

• Atmosphere simulation :
  • International standard atmosphere (to 25 km)
  • coesa 1976 extended model (to 32 km)
  • mil-hdbk-310 and mil-std-210c (to 80 km)

• Wind simulation :
  • nasa dryden turbulence model
  • von-kármán continuous turbulence spectra
  • mil-f-8785c discrete gust and shear models

• Gravity modeling based on WGS-84 ellipsoid

• Motion animation and virtual reality visualization

• Higher-order numerical integrators (fifth order Dormand–Prince)

• Joystick-based real-time control

6 — Tricks and Tweaks

• Scientific calculator and units converter

• Atmospheric properties up to 80 km altitude

• Speak out loud the main calculated parameters

• Instant geometry generation and airloads solutions

• Keyboard shortcuts with adaptive interface behavior

• Save, load, rescale, reposition, and modify geometries

• Custom/calculated reference geometry, mass, and inertia

• Customizable color
  • font color
  • input-panels
  • wire-frame lines
  • surface color-map
  • selected partition/frame
  • main graphical interface window
  • surface shading , rendering options
  • selected wing/body highlight color

7 — Last Updated

Airloads-V5® — 2024