A general tribo-dynamic model for lubricated clearance joints in spatial multibody systems.

Area of Science:

• Multibody Dynamics
• Tribology
• Lubrication Engineering

Background:

• Existing tribo-dynamic models struggle with the strong coupling and nonlinearity between component deformation and oil film pressure in lubricated clearance joints.
• Accurate modeling of these joints is crucial for predicting the performance and reliability of mechanical systems.

Purpose of the Study:

• To develop a novel general tribo-dynamic coupling model capable of accurately characterizing the complex interactions within lubricated clearance joints.
• To validate the proposed model using experimental data from an impact test rig.

Main Methods:

• Formulation of equations of motion for flexible multibody systems using the absolute nodal coordinate formulation.
• Definition of mixed lubrication equations at spatial nodes via a mixed Eulerian-Lagrangian approach.
• Application and validation of the model on a translational clearance joint.

Main Results:

• The developed model successfully depicts the strong coupling characteristics between deformation and pressure fields.
• Experimental validation confirmed the model's accuracy in predicting the dynamical response of lubricated clearance joints.
• The absolute coordinate framework and mixed Eulerian-Lagrangian approach effectively address the model's challenges.

Conclusions:

• The novel tribo-dynamic coupling model provides a more accurate representation of lubricated clearance joints compared to existing methods.
• This advancement is significant for the analysis and design of mechanical systems involving flexible components and lubrication.
• The model's ability to capture strong coupling and nonlinearity opens new avenues for tribo-dynamic research.