Mastering Modular Model Building in MotionView and MotionSolve

Welcome to the Multibody Dynamics for Automotive Applications using MotionView and MotionSolve blog series. In this blog, we will explore the modular model-building approach in multibody dynamics simulation and how container entities help engineers structure complex vehicle system models. 

Why Modular Model Building Matters? 

In multibody dynamics automotive applications, as models become increasingly complex, it becomes essential to structure them in an organized and hierarchical manner. MotionView software encourages a modular approach, allowing engineers to group different subsystems into containers. This method streamlines vehicle dynamics simulation, making it easier to build, debug, and reuse models across multiple projects. 

Using this approach provides several advantages: 

• Clear visualization of subsystems: Engineers can quickly identify different components in a multibody dynamics model, making collaboration easier. 
• Efficient debugging: If a model isn't running correctly, individual subsystems can be activated or deactivated with a single click, simplifying the troubleshooting process. 
• Reusability of subsystems: Engineers can import and export predefined subsystems, saving time when working on multiple automotive engineering simulations. 

Understanding Container Entities in MotionView 

There are three primary container entities in MotionView for automotive engineers: 

• System: Represents a mechanical system simulation with modeling elements like joints, forces, and motion constraints. It can be reused multiple times in different models. 
• Assembly: Used when external files need to be referenced while modeling mechanisms. 
• Analysis: Focuses on simulating results but can also contain modeling entities. 

For multibody dynamics modeling, we primarily focus on systems, which contain bodies, points, forces, and constraints. 

Creating, Importing, and Exporting Systems in MotionView 

There are two ways to create a system in MotionView software: 

• Right-click on the model browser and select Add System. 
• Right-click within the model tree, go to Add > System or Assembly, and proceed with the system setup. 

When defining a new system, users need to provide: 

• Variable name (fixed once assigned). 
• Label name (modifiable during modeling). 
• Definition name (used for multibody dynamics certification courses where template reuse is required). 

To import/export a system, users can: 

• Import: Select the Import radio button, browse the system definition file, and load it. 
• Export: Click Export, choose the system, and select whether to include model topology and property data. 

Practical Use Case: Hatchback Door System 

To illustrate the modular model-building approach, consider a hatchback door simulation: 

The parent system (hatchback system) contains two subsystems: 

• Door system (door, hinge joint). 
• Damper system (damping elements connecting the door and vehicle frame). 

These subsystems can be reused for different automotive multibody simulations, making them valuable assets in MotionView online courses. 

Conclusion 

Understanding container entities is crucial for multibody dynamics analysis, especially when working on complex vehicle system modeling. By following a modular approach, engineers can improve efficiency, reduce debugging time, and enhance collaboration when working on automotive engineering simulations. 

In the next blog, we will discuss the spring-damper entity in MotionView and how to implement it in automotive suspension simulations. 

This blog is part of our ongoing Multibody Dynamics blog series. If you missed the previous posts, check them out here.  

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