Simpack

Simpack is a multibody dynamics (MBD) simulation platform used to analyze motion, forces, and dynamic interactions in complex mechanical systems. Developed by Dassault Systèmes as part of its SIMULIA suite, Simpack enables engineers to simulate how mechanical components behave when connected in dynamic systems subjected to real-world loading conditions.

The software is particularly known for its high-fidelity vehicle dynamics simulation capabilities. Engineers can model entire systems such as suspension assemblies, drivetrains, steering systems, and chassis components to evaluate dynamic performance before physical prototypes are built.

Unlike general-purpose MBD tools, Simpack is built around a solver architecture that covers the full frequency range from quasi-static through acoustic. This makes it suitable for applications where standard rigid-body kinematics are insufficient and where flexible body behavior, nonlinear contacts, and closed-loop control systems all need to be captured simultaneously.

Because of its accuracy and depth, Simpack is widely used in industries such as automotive engineering, railway vehicle development, wind energy, and aerospace.

Key Features

• Rigid and flexible multibody dynamics covering the full frequency spectrum from static through acoustic and NVH regimes
• Simpack Realtime providing a real-time MBD solver for HIL, SIL, and MIL applications without requiring code generation
• Simpack Rail with dedicated railway vehicle dynamics including wheel-rail contact modeling, derailment analysis, and track interaction
• Simpack Automotive for suspension, chassis, tire, and full vehicle dynamics simulation
• Simpack Wind covering complete wind turbine drivetrain, rotor blade, and load case simulation
• Simpack NVH for frequency-based and time-based noise, vibration, and harshness analysis
• FlexModal and SIMBEAM for flexible body integration using FEA-derived mode shapes
• Simpack Control for active controller and closed-loop mechatronic system simulation
• Abaqus co-simulation enabling coupled flexible body structural and dynamics analysis within the Dassault Systèmes ecosystem
• Design of Experiments module for automated parameter variation and performance optimization studies

Best For

Automotive, railway, wind energy, and aerospace engineers who need multibody dynamics simulation at the high-frequency end of the spectrum. Simpack is particularly suited to NVH analysis, drivetrain dynamics, fatigue load generation, and real-time HIL integration, where its solver depth and industry-specific modules offer capabilities that general-purpose MBD tools do not match.

Well suited to development programs where regulatory load certification, physical test rig correlation, or real-time hardware integration requirements make solver fidelity a non-negotiable design criterion rather than a nice-to-have.

Who It's Not For

Teams that need a broad, general-purpose mechanism simulation tool for basic kinematic analysis or conceptual dynamics work. MSC Adams covers those use cases with a larger installed base and more accessible entry-level configuration.

Simpack is a specialist platform that earns its place when the physics specifically demands high-frequency transient accuracy or real-time hardware integration. Organizations without those requirements will find its modular pricing structure and steeper learning investment difficult to justify against more broadly positioned alternatives.

Platform

• Windows and Linux desktop.
• Linux is preferred for HPC cluster deployments.
• Real-time deployment supported on dedicated HIL hardware platforms from major test rig vendors.
• Cloud-based simulation available through the Dassault Systèmes 3DEXPERIENCE platform.

Pricing

Enterprise pricing.

Simpack is licensed around a core module set covering Pre, Solver, Post, and Wizard capabilities, which organizations extend with general or industry-specific add-ons based on their simulation disciplines. This modular structure means teams pay for the physics they actually use rather than the full suite.

Pricing is not publicly listed. Contact Dassault Systèmes SIMULIA directly or through certified resellers for configuration and pricing. Academic licensing is available through university partnerships for non-commercial research use.

Pros

• Industry standard for railway vehicle dynamics with rail-specific depth that no competing MBD tool currently matches
• Real-time solver enables direct HIL and SIL hardware integration without code generation overhead
• High-frequency transient capability extends MBD analysis into the NVH and acoustic range that most MBD tools cannot reach
• Abaqus co-simulation delivers tightly coupled flexible body dynamics within the Dassault Systèmes ecosystem with no translation overhead
• All Simpack modules share a common solver and are fully compatible, eliminating integration friction between disciplines
• 3DEXPERIENCE platform integration enables browser-based model access and team collaboration without desktop installation

Cons

• Narrower general-purpose appeal than Adams, with maximum value delivered only when high-frequency or railway-specific physics requirements are present
• Modular enterprise pricing makes cost estimation difficult without direct reseller engagement
• Smaller global user community than Adams, with fewer independent training resources and online discussion forums
• UI modernization has been gradual, and the interface feels less contemporary than newer simulation environments
• Windows and Linux only with no macOS support

Rating

⭐ 4.4 / 5

Editorial Take

Simpack is widely regarded as a specialist tool for high-accuracy multibody dynamics simulation, particularly in vehicle and drivetrain engineering. For automotive and railway development teams working at the demanding end of dynamic analysis, it provides a level of physics fidelity and industry-specific depth that broader MBD platforms are not designed to match.

Alternatives

MSC Adams, RecurDyn, Altair MotionSolve, LMS Virtual.Lab, VI-Grade, Simcenter Motion

Used In

• Railway vehicle dynamics and certification

• Automotive NVH and suspension development

• Wind turbine drivetrain certification and load analysis

• Aerospace landing gear and deployment mechanism simulation

• Engine and powertrain dynamics

• Industrial robotics motion analysis

• HIL and SIL test rig integration

Founded

1996