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What is Simpack?

SIMULIA Simpack is a complete software package dedicated to the development and simulation of high-fidelity multibody system virtual prototypes. It provides solutions that cover the needs of individual multibody experts up to large-scale company-wide deployments with hundreds of users.

What sets Simpack apart from other solutions is its reliance on a unique technology for setting up the equations of motion of a system. Therefore, the notable advantages of SIMPACK are the speed and robustness of its solver, surpassing its closest competitors, and its utilization of the latest mathematical techniques to deliver the highest degree of accuracy and reliability.

Simpack Application Areas

Thanks to its capability to model a wide range of mechanical systems, Simpack is a versatile tool that can be employed to solve engineering problems across various sectors of the mechanical industry. It is particularly well suited for modeling road and track vehicles (such as motorcycles, cars, trucks or trains), power systems (including internal combustion engines, electric engines and generators as well as drivetrain systems), and more.

Since 2005, SIMULIA/Simpack has also been offering the first industrial multibody solver capable of running any simulation model in a real-time environment, such as driving simulators or hardware-in-the-loop systems, without the need for code generation.



Simpack Automotive is used by many of the biggest automotive OEMs for all of their multibody simulation processes, especially in the field of suspension and chassis engineering. Simpack aids engineers in analyzing and designing any type of on- or off-road vehicle.


  • Unlimited modeling flexibility
  • Extreme non-linear system behavior
  • Analyses in the frequency and time domain
  • Fully parameterized, highly detailed automotive database
  • for all typical suspension/driveline types available
  • Scalable detail and complexity
  • Process automation and standardization using Simpack Wizard
  • Batch jobs and automatic report generation
  • Interfaces to third-party software
Simpack Automotive Simulation > Dassault Systèmes


Simpack simulates anything from passenger jets, helicopters and satellites to autonomous planetary vehicles and comet probes–virtually any aerospace application area.


  • Simulation of any aeronautical design
  • Open and closed loop systems
  • Resonance analysis
  • Stochastic and transient response
  • Geometric and material modification
  • Lift-off and touch down analyses
  • Payload separations
  • Solar panel deployment, robotics, etc.


Simpack enables detailed modeling of biomechanical systems in areas such as sports medicine, orthopedics and human-machine interaction.


  • Detailed Human Models
  • Forward dynamic motion synthesizes and enables Human-in-the-Loop simulation
  • Extendable by user-defined elements
  • Realistic man-machine interaction
  • Detailed human rider model
  • Fully compatible with Biomotion TraXXol and Varibody
SImpack Biomechanics Simulation > Dassault Systèmes


Adding to the functionality of Simpack in the automotive, wind turbine and rail sectors, Simpack Drivetrain is suited to the analysis and optimization of any mechanical power transmission system.


  • Simulation of any design
  • Extreme non-linear system behavior, for example, emergency braking
  • Acoustic analyses in the frequency and time domain
  • Detailed Gear Pair and bearing elements
  • Numerous possible levels of fidelity
  • Complete system behavior
  • Batch jobs
  • Automatic analysis reports
  • Drivetrain specific elements
  • Importation of flexible bodies from common FEM codes
Simpack Drivetrain Simulation > Dassault Systèmes


Within the automotive, land machinery, shipping and power generator sectors, Simpack Engine enables engineers to design, optimize and fully understand the coupled dynamics of complete combustion engine systems.


  • Pre-defined and fully parameterized database models of all common engine types
  • Specialized user interfaces for chain drives, hydrodynamic bearings and valve spring generation
  • Application-specific modeling elements for belt, combustion pressure maps and hydraulic lash adjusters
  • Scalable level of model detail and complexity
  • Reuse of verified components in system context
  • Complete system simulations
  • Extreme non-linear system behavior
  • Unlimited modeling flexibility
  • Reasonable computation times due to Simpack specialized solvers and relative coordinate algorithm
  • Broad interfaces to third-party software
  • Detailed bearing models (journal and rolling bearing)


Simpack Realtime enables the use of complex models for a wide range of performance-critical real-time applications such as Hardware-in-the-Loop (HIL) and Software-in-the-Loop (SIL) scenarios. Typical applications include handling and comfort simulations, ECU testing and component test rigs, for example, for gearboxes and engines.


  • Unmatched model detail for real-time applications
  • Seamless process, from complex MBS offline analysis to real-time applications
  • Common databases and models for detailed MBS analyses and HIL/SIL applications
  • Flexible bodies from FEM codes or Simpack
  • Considerable acceleration of simulation time
  • Easy model modification with the Simpack model editor


Simpack helps to analyze and design any type of rail-based vehicle or mechanism – from roller coasters, material handling systems or tramcars to complete articulated high-speed trains. Manufacturers and operators worldwide use Simpack as the leading MBS software for railway system dynamics.


  • Unlimited flexibility
  • Easy assembly of multi-car trains from submodels
  • Powerful track editor
  • Each wheel is treated independently.
  • Scalable detail and complexity
  • Batch jobs Automatic analysis reports
  • Curving, rail-to-wheel forces
  • Switches and crossing design
  • Driveline and braking
Simpack Rail Simulation > Dassault Systèmes


Built on technology that has proved its worth in many application areas, Simpack Wind offers users unparalleled insight into the dynamics of any complete wind turbine system.


  • Load calculations
  • Extreme non-linear system behavior, for example emergency 
    braking, voltage dip, wind gust
  • Interfaces to aerodynamic codes, for example from NREL and ECN
  • Scalable detail and complexity
  • Available wind turbine models with highly detailed drivetrains
  • Flexible rotor blade generator
  • Automatic analysis reports
  • Batch jobs
Multibody Simulation of a Wind Turbine > Dassault Systèmes

Other sectors

Simpack is uniquely suited to the analysis and design of any type of mechanical or mechatronic system. In addition to its primary application areas, Simpack can be applied to practically any engineering field.


  • Simulation of any mechanical/mechatronic system
  • Non-linear bending
  • Stress and durability analyses
  • Integration of in-house software into Simpack
  • Time domain frequency analysis up into the acoustic range
  • Transient harsh shock contact
Simpack Dragon > Dassault Systèmes

Simpack Product Modules

Simpack's packaging relies on a core set of modules, including Simpack Pre, Simpack Solver, Simpack Post, and Simpack Wizard, which can be extended with additional general or industry-specific add-ons.

Simpack Base Module > Dassault Systèmes
Core Modules
Simpack Multibody System Simulation Core Functionality
Simpack Automotive Modules > Dassault Systèmes
Automotive Modules
Simpack Automotive Modules for Full Vehicle Analysis
Simpack bearings > Dassault Systèmes
Bearing Modules
Simpack Simulates Bearings Interaction with the Complete System
Simpack Biomotion > Dassault Systèmes
Biomotion Modules
Simpack Simulates the Interaction between Humans and Technical Devices
Simpack Drivetrain > Dassault Systèmes
Drivetrain Modules
Simpack Simulates Mechanical Power Transmission Systems
Simulia Simpack > Dassault Systèmes
Engine Modules
Simulating Engine Operation with Simpack
Simpack Flexible Body > Dassault Systèmes
Flexible Body Simulation Modules
Flexible Bodies in Simpack Multibody System Simulation
Simpack General Module > Dassault Systèmes
General Add-On Modules
Extending Simpack Capabilities
Simpack Multi Domain Interfaces > Dassault Systèmes
Multi Domain Interfaces
Enabling Co-simulation for Simpack
Simpack Rail > Dassault Systèmes
Rail Modules
Simpack Multibody System Simulation of Rail-Guided Systems
Simpack Realtime > Dassault Systèmes
Realtime Module
Simpack Hardware-in-the-Loop (HiL) and Man-in-the-Loop (MiL) Simulations
Simpack Wind > Dassault Systèmes
Wind Modules
Simpack Simulates the Dynamics of Complete Wind Turbine Systems

Simpack Simulation Resources

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