Engineering Class


Our software GearSim is a tool for the classroom. 

This commercially available software allows students to simulate scenarios for:

  • Take-off

  • Landing

  • Braking

  • Steering

  • Shimmy Analysis

  • Uneven terrain

  • Hard landings

  • Crosswind landings

GearSim is based in MATLAB and suited for rapid systems and subsystems-level analysis. Let's teach together. 

Our Education Experience

  • Teaching students and professionals around the globe for over 5 years

  • Formal training for aircraft OEMs, universities, and government agencies (USAF) on our GearSim software tool 

  • GearSim as Capstone projects with Seattle University

Our Software Solution

GearSim software logo

A landing gear simulation tool for performing ground loads and landing gear systems analysis offering high utility with rapid modeling capability and built-in library of various landing gear types.

GearSim can provide predictive analysis of landing gear performance, comprehensive analysis for aircraft and landing gear structural modeling, systems analysis and ground loads 

Developed and validated by SDI with several industry partners. This work continues in collaboration with the USAF and major aircraft OEMs.  


  • Integrated modeling of landing gear and nonlinear aeroservoelastic aircraft dynamics

  • Simulation of the entire aircraft, individual landing gear components, landing gear facility testing and performance evaluation

  • Hydraulic and actuation system models

  • Propulsion and flight control system modeling integrated with full aircraft aeroelastics

  • Detailed braking, steering and tire dynamics

  • Shimmy and gear walk, stability analysis

  • Primary focus on military and commercial aircraft for landing gear or aircraft subsystem analysis, ground maneuvering, and flight test cases

  • Validated against military and commercial aircraft landing gear and subsystem test data

GearSim in Action

Nose Landing Gear Drop Test

  • Based on military aircraft

  • Single-wheel landing gear

  • Dropped height: 2.5 m

  • Impact velocity: 3 m/s

Nose Landing Gear Shimmy Test

  • Based on military aircraft

  • Single wheel landing gear

  • Hammer strike at 2 seconds

  • Flexible oscillations damped for this case

  • Frequency and damping post-processing tools available

Whole Aircraft Landing

  • Based on wide-body commercial aircraft

  • Aircraft mass: 174,000 kg

  • Four-wheel main landing gear and two-wheel nose landing gear

  • Initial ground speed: 75 m/s

  • Descent rate: 3 m/s

Together We Build the Aerospace Industry of Tomorrow


driving plane