Category: Simpack

17 Dec 2021

On Demand eSeminar: Improve Performance of Rail Vehicles with Multibody System Simulation

Rail vehicles complexity is strongly related to the contact between wheel and rail. Leaders in rail vehicle industry have used SIMULIA Simpack multibody simulation software for more than 20 years for concept studies, bogie detail design, rail-wheel-contact, sub-system design and full-vehicle integration.

Simpack enables designers and engineers to model and simulate fixed wheel sets, independent wheels, cable cars, and even rollercoasters.

This On Demand eSeminar covers special modeling elements and techniques for rail track and vehicle modeling & simulation, including:

• Multibody System Simulation Overview
• Rail and Wheel Modeling
• Stress & Traction Distribution
• Rail-Wheel-Contact
• Safety & Wear Calculation

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Related content:

On Demand Webinar: Evaluate Performance of Electric Drive Trains with Multibody System Simulation

On Demand eSeminar: Simulate Dynamic Motions of Wind Turbines

See What’s New in Simpack 2022


07 Dec 2021

On Demand eSeminar: Simulate Dynamic Motions of Wind Turbines

As wind turbines increase in size, additional requirements are put on simulation software in order to be able to accurately predict loading. In addition, noise prediction is one of the primary design criteria for turbine manufacturers and component suppliers.

This webinar covers the industry trends and challenges facing the wind turbine sector along with the wide range of SIMULIA workflows for the wind turbine engineering and benefits to be gained by using SIMULIA Simpack. 

Watch this On Demand eSeminar to learn about the wide range and necessity of current multibody simulation (MBS) applications within the wind turbine sector, including:

• Industry Trends & Technical Challenges
• Why high fidelity MBS simulation is necessary
• How MBS software is being used throughout the industry
• Overview and benefits of Dassault Systèmes solutions

Related Content:

On Demand Webinar: Evaluate Performance of Electric Drive Trains with Multibody System Simulation

See What’s New in Simpack 2022

25 Oct 2021

MBS Virtual Tech Days on Nov 16-18, 2021

Join us and Dassault Systémes for this three-day MBS Tech Day series on November 16–18, 2021, where a forum for engineers and experts come together to present their work, exchange ideas and experiences with other experts, and learn about the latest developments in Multibody System Simulation (MBS).

SIMULIA Simpack, used for the dynamic analysis of any mechanical or mechatronic system, enables engineers to generate and solve virtual 3D models in order to predict and visualize motion, coupling forces, and stresses. 

With many of the world’s largest markets implementing stricter standards and more difficult certification procedures, manufacturers need to overcome difficult challenges and still focus on the customer experience.

During the three-day event, with a technical-packed agenda, we will be focusing solely on Simpack multibody simulation experiences and developments. We provide you the chance to find out how SIMULA Simpack can help you meet your targets and design better products. 


  • Automotive topics on November 16, 2021
  • Rail Vehicles topics on November 17, 2021
  • General MBS topics on November 18, 2021

Register today

Sign up for individual days or the entire event (each day requires an individual registration). The MBS Tech Days are a virtual event — join the session benefitting you most.

For more information, visit the MBS Tech Days event page.

17 Sep 2021

See What’s New in Simpack 2022

Watch our On Demand eSeminar: Accelerate Product Development with Mechanical System Simulation 

Currently, the most up-to-date major version of Simpack is Simpack 2022.

Every current Simpack user is encouraged to download and upgrade to this latest version, or at least to one of the minor releases available. Here is an overview of the most up to date releases of Simpack as of today:

  • Simpack 2022.1 ( released 2021-06-18 )
  • Simpack 2021x.5 ( released 2021-05-28 )
  • Simpack 2021.5 ( released 2021-06-18 )

Watch the On-Demand eSeminar:

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Learn more about Simpack and the new capabilities related to:

EHD Bearing

The Simpack EHD module has been enhanced to include thermal balance and mass conserving effects in the fluid. This allows the EHD model to compute the temperature evolution over time in the fluid, allowing to observe the heating up of the bearing. The mass conserving algorithm will help the user to analyze cavitation effects and oil flows in more detail.

Additionally, the output of this element has been extended to provide out-of-the-box results at bearing half-width.

Dynamic Bushing

The dynamic bushing force element is used to model accurately the specific frequency behavior of engine and suspension bushing mounts. With recent versions of Simpack, there have been several enhancements brought to this element:

  • Optional direction coupling of the bushing stiffness

    It is now optionally possible to specify the coupling effect between different directions of the bushing. This can be used for example to better model cylindrical bushings with isotropic or orthotropic behavior.

  • Enhanced hysteresis shape definition

  • Dassault Systémes has introduced a new shape factor to refine the fitting of the shape of the hysteresis. This factor does not affect the overall amplitude of the hysteresis but gives the user control of the shape of the curve.

Electric Machine Interface

Since Simpack 2019x, Simpack supports the application of electromechanical forces with the Electric machine interface force element. This element can apply distributed forces on the stator and the rotor of the machine. It uses as an input a set of characteristic maps. A characteristic map is a map of lumped forces/torques or force densities as a function of the rotation of the rotor given at a specific speed/torque point of the e-drive machine.

The interface has been extended recently to support Reduced-Order Models that can be produced by CST Studio Suite. The added value of using a Reduced Order Model (ROM) for this application is that it is possible with a ROM to run different load cases such as torque run-up or speed run-up with one single element.

Simpack Roller Bearing

Several significant enhancements have been recently added to the Simpack Roller Bearing model:

  • It is now possible to apply a user-defined profile to the rollers

  • The lateral distribution of the loads on the roller can now be computed. This new feature vastly extends the functionality and applications of this modeling element. Including this bearing element in complete mechanical drives, models will provide improved results for misalignment calculations.

  • The contact force between the elements can now take into account optionally the damping effects due to lubrication.

Simpack Rail and Flextrack

Fast calculation of flexible track/structures


Dassault Systémes has introduced a new method for modeling flexible tracks called “linear Flextrack”. This new method considerably reduces the model build time and dramatically improves the solver performance, considerably reducing solve time. As an example, Flexible tracks simulations can now be run in a matter of few minutes rather than hours.

Improved Rail Contact Model for Supporting Standstill

The Simpack Rail contact model has been extended to support standstill conditions as an option in the rail/wheel pair element that allows for the stick/slip transition of the rail contact at very low velocity. It is now possible with this option to model new workflows :

  • Emergency braking simulation

  • Improved static test rig set-up and analyses

  • Modeling real-life velocity profile of light-rail vehicles including stop/start behavior between stations.

With the Simpack Belt module, it is now possible to plot belt transverse deflections and stick-slip contours on the belt shape and other quantities such as longitudinal or normal force distributions.

This enables analysts to gain more insight into the belt behavior for typical belt analysis scenarios, allowing them to identify critical regions at first glance.

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