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Modal Analysis of Ship’s Mast Structure using Effective Mass Participation Factor


  • School of Mechanical and Manufacturing Engineering (SMME), National University of Sciences and Technology (NUST), H-12 Main Campus, Islamabad, Pakistan
  • Department of Computer Science, Institute of Southern Punjab, Multan, Pakistan


Background/Objectives: Each structure tends to vibrate at particular frequencies, called resonant or natural frequencies. When a structure is excited by dynamic load with frequency coinciding one of its natural frequencies the structure experiences stresses and large displacements. In this paper effective mass participation factor criterion is used to solve the vibration problem in the ship mast. Methods/Statistical Analysis: The effective mass participation factor provides a measure of the energy contained within each resonant mode. Vibration problem originated when one of the antenna at top of mast was replaced by a new antenna with greater mass at same location. The overall mast structure started vibrating because of the resonance of natural frequencies of the mast structure with natural frequencies of rotary equipment. Findings: It caused interruption in sensitivity of equipment installed on the mast structure. Instead of fabricating the new mast structure, some alteration has been carried out on the basis of results obtained from modal analysis. Application/Improvements: The study is very effective to overcome the vibration problems in ship mast.


Effective Mass Participation, Modal Analysis, Mode Shape, Ship Mast.

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  • Chierichetti MC. A modal approach for dynamic response monitoring from experimental data. Mechanical Systems and Signal Processing. 2014; 48(1-2):199–217.
  • Zhang YZ, Xu X. Modal Parameter Identification Using Response Data Only. Journal of Sound and Vibration. 2005; 282(1-2):367–80.
  • Luz E, Wallsheck J. Experimental modal analysis using ambient vibration. Journal of Analytical and Experimental Modal Analysis.1992; 7(4):29–39.
  • Idehara JM. Modal analysis of structures under non-stationary excitation. Engineering Structures. 2015; 99(1):56–62.
  • James GH, Carne TG, Lauffer JP, Nord AR. Modal Testing Using Natural Excitation. Proceedings of the 10th International Modal Analysis Conference (IMAC), San Diego, California.1992. p. 1209–16.
  • Kwon YW, Plessas SD. Numerical modal analysis of composite structures coupled with water. Composite Structures. 2014; 116(1):325–35.
  • Aenlle RAC. Some Methods to Determine Scaled Mode Shapes in Natural Input Modal Analysis. Proceeding of the 23rd IMAC. 2005; 1–11.
  • Bureau VERITAS (BV) Rules for Naval ships edition, Part B, Chapter 9, Section 5, Masts and Other Outfitting Components. 2011.
  • MIL-STD-810G, Department of defense test method standard, environmental engineering considerations and laboratory tests, 2012.
  • Mazlan A, Ripin Z. Active Vibration Control to Attenuate Hand-arm Vibration from Orbital Sander: A Mathematical Model Approach. Indian Journal of Science and Technology. 2015; 8(30):1–8.


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