An Experimental Study On The Propagation Of Vibration And Comparison Of Damping In A Steel Support Structures

Yang, Kok Wei (2008) An Experimental Study On The Propagation Of Vibration And Comparison Of Damping In A Steel Support Structures. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This thesis presents an experimental study on propagation of vibration and comparison of damping in a steel support structures. Vibration transmission occurs in the steel columns that are used to build railway stations are meant to support railway line and applied to other problems of structural and mechanical vibration. This study is mainly focused on the vibration in the structures as vibration can be transmitted to various parts and then radiated as structure-borne noise. Impact hammer testing is used to test the modal damping, with and without damping to obtain the natural frequency, damping ratio and mode shapes for different damping materials that shall be used such as sand, wood dust and used vehicle lubricating oil. An experiment test rig is built up for vibration testing. An impact hammer with plastic tip, SKF Microlog CMVA 65 Data Analyzer and Machine Analyst (MA) software are used to conduct the experiment. The steel column is attached by accelerometer at different positions on outer surface to find out the accurate results whether the noise disturbance occur during experiment. The vibration spectrums will be analyzed through the MA software. From the results obtained, when the mass of damping material increases, the natural frequency decreases and the damping ratio also increases. The impact force did not bring any changes to the natural frequency on vibration spectrums whether the impact force increased or decreased but it will change the vibration displacement only while the damping ratios remain constant. The experiment results correspond to the expected results based on the theory. This can be proven by using Half Power Law's equation. The objectives which are with and without adding the damping material in the steel column and the different natural frequencies for each height level of the column are achieved.

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