Engineering Simulation Workbenches
Simulation-first tools are grouped here so you can go directly to interactive models, visualizers, design environments, and time-domain engineering workbenches. The complete calculator/reference library remains available under Tools.
Available now
These workbenches run in the browser and remain part of their normal engineering subject categories.
Chaotic Pendulum Forecast Lab
Integrate a two to seven arm pendulum with Runge-Kutta and race three statistical forecasters against deterministic chaos.
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Control System Simulator
Free online control system simulator for building continuous, discrete, and mixed sampled-data block diagrams directly in your browser. Tune PID controllers, simulate transfer-function and state-space plants, and inspect step response, Bode behavior, poles, and performance metrics without an account or installation.
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Electrical Engineering Design Workbench
Size and compare conductors, calculate voltage drop and cable loss, and solve DC, single-phase, and balanced three-phase power without jumping between reference charts.
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DIY Power System Designer
Plan, simulate, document, and export a small off-grid, backup, mobile, workshop, or experimental power system from one shared load list: compare 12 V/24 V/48 V/higher-voltage DC architectures; screen selected equipment against calculated requirements; build a project BOM and printable engineering report; size batteries, inverter, solar, PV strings/MPPT, DC wiring and distribution; model battery aging/temperature/Peukert effects; simulate hourly through 365-day PV, battery, grid/shore, and generator dispatch including measured CSV profiles; optimize bounded design scenarios; project multi-year reliability/lifecycle costs; and transfer synchronized engineering values into compatible Electrical, Electronics, and Control workbenches.
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Multi-Stage Lens Ray Simulator
Trace parallel rays through configurable spherical lens surfaces using Snell’s law and inspect focal behavior and spherical aberration.
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Rocket Engine CEA Simulator
Solve rocket engine performance from chemical equilibrium: adiabatic flame temperature, product composition, characteristic velocity, thrust coefficient, and specific impulse for real propellant combinations.
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NASA Glenn Thermochemical Data Explorer
Standard heat capacity, enthalpy, entropy, and Gibbs energy for 49 species from NASA’s published polynomial fits, with reaction properties and equilibrium constants across temperature.
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Orbital Mechanics Simulator
Free browser-based orbital mechanics simulator for propagating spacecraft trajectories around Earth, the Moon, Mars, Jupiter, the Sun, or a custom central body. Enter classical orbital elements or a Cartesian state vector, apply RTN impulsive burns, inspect Hohmann transfers, animate the trajectory in a rotatable 3D-style view, and export/share the scenario without an account.
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Mechanical Gear Train Simulator
Free browser-based mechanical gear train simulator for spur, compound, internal, and planetary gear systems. Explore speed ratio, rotation direction, torque multiplication, mesh velocity, and basic gear geometry with animated layouts and no account required.
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3D Crystal & Molecular Lattice Viewer
Free browser-based 3D crystal and molecular lattice viewer for common materials structures and custom unit cells. Inspect SC, BCC, FCC, HCP, diamond, ionic, semiconductor, ceramic, graphene, and molecular presets; enter fractional atomic coordinates; replicate the cell; examine nearest neighbors; overlay Miller planes and crystallographic directions; and export XYZ or CIF data.
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