Running a 3D Contact Simulation and Analyzing Contact Forces in MotionView

Welcome to the Multibody Dynamics for Automotive Applications using MotionView and MotionSolve blog series. In this blog, we will simulate the ball bearing contact model and analyze the contact forces, penetration depth, and motion behavior using MotionView for beginners. 

Assigning Motion to the Inner Race 

Before running the simulation, we need to define motion for the inner race. This is achieved by: 

• Right-clicking on the Motion icon and creating a new rotation motion. 
• Setting the motion to be defined by markers. 
• Selecting Marker CM of the inner race and Marker CM of the outer race. 
• Assigning an expression: Motion=360×3×Time\text{Motion} = 360 \times 3 \times \text{Time}Motion=360×3×Time This ensures a rotational motion of 1080 degrees per second. 

Optimizing the Simulation Settings 

To prevent convergence failures, we modify the maximum simulation step size to 0.001. The model is then saved as BallBearingContact.XML and executed in MotionSolve software. 

Reviewing the Simulation Results 

• Upon completion, MotionView automatically generates a report, eliminating the need for manual animation review. To access results: 
• Navigate to Analysis > View Reports. 
• Select the latest report to load the HyperView and HyperGraph pages. 

Key Insights from Contact Simulation 

1. Contact Force Visualization 

The vector plot feature allows us to observe contact force magnitudes and directions. By selecting Total Contact Force and adjusting the scaling factor, we see how forces distribute across the ball bearings. 

2. Contact Force Contour Plot 

A contour plot highlights regions with maximum contact forces. In our case: 

• Ball 4 and Outer Race experience the highest contact force. 
• This insight helps optimize the contact region for better performance. 

3. Contact Penetration Depth 

An animation shows penetration depth variations, revealing: 

• Maximum penetration: 0.614 mm. 
• This helps ensure the stiffness and damping values are correctly set. 

4. Time vs Contact Force Graph 

A force vs time plot provides a detailed breakdown of individual contact interactions. By isolating Ball 4’s contact force, we see a peak within 0.1 seconds. 

Conclusion 

Through this MotionSolve tutorial, we successfully: 

• Ran a multibody dynamics simulation with 3D contacts. 
• Analyzed contact forces for mechanical system simulation. 
• Identified critical force regions for model optimization. 

By applying these vehicle dynamics simulation techniques, engineers can improve automotive component design and performance. 

Looking to master multibody dynamics using MotionView? Enroll in a MotionView training course today! 

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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