Modal and Harmonic analysis of a small-scale ball mill based on ANSYS

  • Justin Byiringiro Jomo Kenyatta University of Agriculture and Technology
  • James Kimotho Kimotho Jomo Kenyatta University of Agriculture and Technology
  • Hiram Ndiritu Jomo Kenyatta University of Agriculture and Technology

Abstract

Ball mill is a grinding machine used in mineral processing, comprising of a rotating cylindrical shell filled with steel balls and the material to be ground. The ball mill is inevitably accompanied by vibration during operation. This vibration may lead to resonance in the structural components if the natural frequency matches the operating frequency. Therefore, it is important to study the dynamic characteristics of the ball mill. Modal analysis is an essential technique which helps in predicting the possibility of resonance by determining the natural frequencies as well as mode shapes. In this study, modal analysis of a small-scale ball mill developed in Jkuat is carried out in ANSYS Workbench 16.0. The first ten modes of vibration are extracted for two scenarios, one, for the ball mill and frame support (drum, shaft and frame support) and two, for the drum and shaft. Harmonic analysis is done to visualize the response of the ball mill structure under dynamic loading. The results show that some frequencies fall within the expected operating frequencies.
Keywords—Ball mill, Finite Element Method, Modal Analysis, Resonance, Harmonic response.
Published
Jun 27, 2018
How to Cite
BYIRINGIRO, Justin; KIMOTHO, James Kimotho; NDIRITU, Hiram. Modal and Harmonic analysis of a small-scale ball mill based on ANSYS. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 230-236, june 2018. ISSN 2079-6226. Available at: <http://sri.jkuat.ac.ke/ojs/index.php/proceedings/article/view/672>. Date accessed: 21 aug. 2019.