ORIGINAL RESEARCH article
Front. Mech. Eng.
Sec. Vibration Systems
Dynamic Modeling and Frequency Response Characteristic Analysis of Heavy Boring Machine Tool Post System Based on 5-DOF
Tianshui Normal University, Tianshui, China
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Abstract
Heavy boring machine is essential for high precision manufacturing in foundational industries, including energy, shipbuilding, metallurgy, aerospace, and heavy machinery. In this paper, the dynamic modeling and analysis for heavy boring machine are presented. Based on the theory of vibration mechanics, a five degree of freedom (5-DOF) dynamic model of the tool holder is proposed. Based on the Bernoulli beam theory, the coupling dynamic model of the boring bar and the tool holder is established. The frequency response characteristic parameters of the tool post system are obtained. The results show that the natural frequency of the present model are 7.68Hz, 12.48Hz, 24.14Hz, 31.31Hz, 41.19Hz. The results of the finite element method show that the natural frequencies of the tool post system are 7.6621Hz, 12.483Hz, 24.179Hz, 31.214Hz, 41.268Hz, and the maximum error is 0.31 %. It is further verifying the effectiveness of the theoretical modeling. Based on the theoretical calculation of the stiffness and damping parameters of each joint of the tool post system, the transient analysis of the first three natural frequencies is carried out by the finite element method. The deformation of each structure of the tool post system at different frequencies is obtained. While the excitation is 7Hz, the maximum deformation of tool holder is 4.8mm. The research results further clarify that the low frequency excitation has a great influence on the vibration characteristics of the tool holder of the tool post system. In order to reduce the vibration of tool holder, the damping characteristics of the tool post system are analyzed based on the finite element method. By comparing the transient response of tool holder under the condition of damping ratio of 0.01,0.03 and 0.05, the results show that the damping ratio has a great influence on the amplitude of tool holder under low frequency excitation. The research results provide favorable support for the design and optimization of heavy machine tools.
Summary
Keywords
5-DOF dynamic model, Damping ratio, Finite element method, Frequency response, heavy boring machine
Received
15 May 2026
Accepted
04 August 2026
Copyright
© 2026 Hongping and Zhu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Yang Hongping
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