Structural Dynamic Analysis of Multistage Mounted Machine Foundation

CSME 2025/08
Volume 46 No.4 : 397-406

Structural Dynamic Analysis of Multistage Mounted Machine Foundation

Srihari Palli ^a, Rakesh Chandmal Sharma ^b, Azad Duppala ^c, Sunil Kumar Sharma ^d and Neeraj Sharma ^e
^aMechanical Engineering Department, Aditya Institute of Technology andInstitute of Railway Vehicles and Railway Technology, "Friedrich List" Faculty of Transport and Traffic Sciences, Technische Universität Dresden, Dresden, Germany. Management, Tekkali, India;
^bMechanical Engineering Department, Graphic Era (Deemed to be University), Dehradun, India;Mechanical Engineering Department, Graphic Era Hill University), Dehradun, India
^cMechanical Engineering Department, Aditya Institute of Technology and Management, Tekkali, India
^dSchool of Technology, Gati Shakti Vishwavidyalaya, Vadodara, India;Institute of Railway Vehicles and Railway Technology, "Friedrich List" Faculty of Transport and Traffic Sciences, Technische Universität Dresden, Dresden, Germany.
^eProduction Engineering Department, National Institute of Technology Agartala, Tripura India

Abstract: Effective vibration isolation in machinery foundations is essential for reducing structure-borne noise and improving operational performance, particularly in naval, aerospace, and industrial applications. This study investigates the dynamic behavior and vibration isolation performance of a two-stage raft-mounted system. A nine-degree-of-freedom (DoF) mathematical model was developed, considering translational and rotational motions, and analyzed using MATLAB and ANSYS. Modal analysis identified the natural frequencies of the system, ranging from 5.91 Hz to 24.71 Hz, with harmonic analysis used to evaluate the system's response under dynamic excitation forces. The experimental setup, involving impact hammer testing and accelerometers, validated the numerical results, achieving close agreement attributed to real-world conditions such as imperfect boundary constraints. The model assumes negligible damping for simplicity, focusing on the elastic response of the system used to distribute loads from structures to the ground. Raft foundations, often constructed as thick, reinforced slabs of concrete or metal, are commonly used to distribute loads from structures to the ground. In both static structures and vibrating machinery, these foundations serve as essential components to prevent Raft foundations, often constructed as thick, reinforced slabs of concrete or metal, are commonly excessive motion, which can disrupt machine performance and create adverse conditions for nearby personnel. Structural vibration, caused by dynamic forces from engines, pumps, and compressors, is a key challenge in heavy machinery.

Keywords: Raft, ANSYS, Machine 1, Machine 2, Natural frequenc

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