Multibody dynamics · desktop

Build, run and understand mechanisms and vehicles.

Dynatlas is a desktop studio for multibody dynamics on the open-source Project Chrono engine. Model by clicking, import existing MSC Adams decks, run static, kinematic, dynamic and modal analyses, and study synchronized plots and 3D animation.

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Double lane change at 20 m/s, chase camera — A real run: passenger car, double lane change at 20 m/s, started from static equilibrium.

12,160automated tests in the latest verified build, 0 failing

13 / 13Adams joint reference cases within position, velocity and orientation tolerance

+0.44 %steady-state yaw-rate difference vs Adams, imported Adams Car vehicle, step steer

67 · 69 · 35bodies · joints · bushings of an Adams Car vehicle imported and run as-is

Three ways in

Vehicles: from wizard to manoeuvre

New Vehicle wizard: suspension, steering, driveline and Pacejka tires from a library.
Standard events: step steer, lane change, braking, constant radius.
Starts from static equilibrium on the tires, at the target speed.
Playback starts automatically; the camera follows the chassis.

Main window with a vehicle model and the double lane change playback — Model tree, ribbon and 3D view during playback. Yellow: target path; cyan: vehicle trace.

Mechanisms the way Adams/View users expect

Links, joints, motions, springs, bushings and contacts from the ribbon.
Expressions for motions and forces (360*DTOR*time).
Degree-of-freedom counter and redundant-constraint report.
Kinematic analysis with joint reactions.

Four-bar linkage driven by a crank, one full revolution — A four-bar linkage built in a few clicks, crank driven at 360°/s.

Bring your Adams models

Reads .adm decks: parts, markers, joints including CONVEL, motions, forces, variables, splines, bushings.
Adams Car vehicles from their own files (.adm, .tir, road, events) — not converted to a template.
Anything not imported is listed by name; nothing is dropped silently.
Models can be exported back to .adm.

Slider-crank imported from an Adams dataset, running — A slider-crank imported from an Adams dataset and run.

Compared against Adams, channel by channel

An Adams Car demo vehicle (double wishbone front and rear, PAC89 tires) is imported from its own files and run through the same events. Difference = Dynatlas − Adams, solver step 1 ms.

Event	Quantity	Difference
Static	Tire loads; front / rear spring length	≤ 0.03 %
Straight run, 22.2 m/s	Total tire load	0.03 %
Step steer, 45°	Steady-state yaw rate	+0.44 %
Single lane change	Yaw-rate peaks	+0.19 % / −0.09 %
Straight braking, 60 %	Mean deceleration	+0.34 %
Constant radius, 40 m	Understeer gradient	+3.01 %

Open items are documented, not hidden — for example a +3.5 % difference in steady-state sideslip on step steer. Run times are still well above Adams on the same events; performance work is ongoing and every change is measured.

An AI-native engineering process

Agent team on Claude

Development runs as a multi-agent workflow on Claude Code: a planning session, implementation agents and an independent reviewer that checks every change before it is merged.

Tests as the contract

Every task ends with the full test suite green — about 12,000 tests, with analytical comparisons preferred over snapshot values.

Measured, not claimed

Accuracy and speed changes are measured against closed-form solutions and Adams results, and recorded with the numbers before and after.