Modelling the Stiffness Element in the Multi-Degree of Freedom Mass-Spring System

Abstract:

Structural dynamics in structural engineering analysis involves the modal parameters (natural frequency, mode shape and damping ratio). The modal parameters of engineering structures is mainly influenced by the damping and stiffness properties. This research paper presents the reliability of CELAS element in the finite element modelling to represent the stiffness parameter. The simplified engineering structure considered in this study is a mass-spring system with multi-degree of freedom. Experimental modal testing is performed using an electro-magnetic vibration shaker as an exciter and an accelerometer to record the natural frequency of the system. HyperMesh normal mode analysis is used to compute the natural frequency of the mass-spring system. The comparative evaluation is performed in order to identify the accuracy of the natural frequencies obtained from the modelling analysis and the measured counterparts. Consequently, it is found that the element CELAS has a good capability to represent as the stiffness parameter in the finite element modelling.

• Periodical: Applied Mechanics and Materials (Volume 899)
• Pages: 3-10
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.899.3
• Online since: June 2020
• Authors: Abdul Rahim Bahari*, Mohd Azmi Yunus, Muhamad Norhisham Abdul Rani, Wan Imaan Izhan Wan Iskandar Mirza, Mohd Azam Shah Aziz Shah
• Keywords: CELAS, Experimental Modal Analysis, Finite Element, Spring Stiffness, Spring-Mass System

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