Master Thesis

Simplified analytical kinematic models can capture basic polygonal excitation trends, yet they omit critical nonlinear physical mechanisms governing real-world dynamic performance: Hertzian roller-sprocket contact deformation, pin-bushing joint clearances, and lubrication-dependent friction damping. Operating conditions including rotational speed, chain span tension and lubrication quality further modify vibration magnitudes, peak stress values and torque fluctuation intensity. This master thesis establishes a combined analytical and high-fidelity multibody simulation framework to fully quantify these coupled dynamic phenomena, with multi-layer validation against numerical simulation and physical experimental measurement data.

Master Thesis

Advanced Multibody & Analytical Dynamic Modelling of Roller Chain Drives

Tasks

  • Perform a systematic literature review on chain multibody dynamics, roller-sprocket contact, joint clearance effects and lubricated friction models
  • Develop an enhanced analytical model extending the basic polygonal effect to include approximate contact stiffness and damping
  • Establish a high-fidelity 3D multibody dynamics model in COMSOL with rigid/elastic links, Hertzian contact, joint clearances and speed- and lubrication-dependent friction
  • Carry out extensive parametric studies to quantify the effects of rotational speed, span tension, joint clearance and lubrication on vibration, contact stress and torque fluctuation
  • Validate the multibody model against the improved analytical solutions and calibrate both using experimental data

Start  As of now

Software  Matlab, Comsol/SIMPACK

Requirements   

  • Solid foundation in mathematics and mechanics
  • Ability to work independently
  • Enjoyment of programming tasks and strong motivation to learn

Further Information Dr. Junyu Qi (junyu qi∂kit edu)

Beneficial: Machine Dynamics I & II

Literatures:

[1] P. Yuan, B, He, L. Zhang: Planar dynamic modelling of round link chain drives considering the irregular polygonal action and guide rail. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics. 235, 3, 2021

[2] S. Hu, B. Guo, K. Deng, P. Xu: An Efficient Contact Analysis for Roller Chain. Advanced Materials Research 211-212: 290-294, 2011.

[3] M. Omar: Multibody Dynamics Formulation for Modeling and Simulation of Roller Chain Using Spatial Operator. 2016 International Conference on Mechanical, Manufacturing, Modeling and Mechatronics (IC4M 2016), 51, 2016.

[4] Y. Wang, D. Ji, K. Zhan: Modified sprocket tooth profile of roller chain drives. Mechanism and Machine Theory 70: 380-393, 2013.

[5] S. Pedersen: Simulation and Analysis of Roller Chain Drive Systems. Technical University of

Denmark. DCAMM Report No. S 92, 2004