Why You Shouldn't Have to Choose Between Fidelity and Real Time
Conventional wisdom says a multibody model built for design accuracy is too slow for real time, so you strip it down (reduce bodies, linearize bushings, pre-compute lookup tables) and hope the simplified model still behaves like the original. Simpack takes a different approach. Its recursive, relative-coordinate formulation generates ordinary differential equations (ODEs) instead of the differential-algebraic equations (DAEs) most multibody tools produce. That means lower computational cost per step, no constraint stabilization, and solver structures suited to the fixed-step integrators used in hardware-in-the-loop environments, so the same full, validated model that you trust offline runs in real time, without reduction.

Webinar Scope
In this webinar, 4RealSim will show how the Simpack Realtime module delivers submillisecond real-time performance for complex multibody models (including dynamic bushings, flexible bodies, and nonlinear force elements) with no model reduction, no code generation or compilation, and no target-specific export. Participants will see why Simpack's formulation makes this possible, how a model moves from desktop to real-time hardware and motion platforms, and how it integrates with HIL, SIL, and driver-in-the-loop toolchains.

Topics Covered

• Why most multibody models are too slow for real time, and why Simpack is the exception

• Simpack's recursive, relative-coordinate formulation: ODEs instead of DAEs, and what that buys you

• Running the same validated model in real time: no model reduction, no lookup tables, no code export or compile

• The Simpack Realtime module: submillisecond performance for complex models

• Keeping full fidelity in real time: dynamic bushings, flexible bodies, and nonlinear force elements

• Deploying to HIL, SIL, and driver-in-the-loop / motion-platform environments

• Integrating plant models with real-time toolchains (Simulink, FMU-based co-simulation)

Who Should Attend?

• Multibody engineers preparing models for hardware- or driver-in-the-loop testing

• Teams building real-time driving simulators or motion-platform environments

• Engineers who currently reduce or surrogate models to hit real time, and want to stop

• Controls and systems engineers integrating plant models into SIL/HIL toolchains

• Anyone who assumed real time means giving up model fidelity