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Brodogradnja : An International Journal of Naval Architecture and Ocean Engineering for Research and Development, Vol. 76 No. 2, 2025.

Original scientific paper

https://doi.org/10.21278/brod76202

Drop tower impact rig to assess the effectiveness of suspension seat for small high-speed passenger craft

Faisal Ikram Bin Abd Samad orcid id orcid.org/0000-0002-0267-0695 ; School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia *
Mohd Yuzri Bin Mohd Yusop ; Universiti Kuala Lumpur, Malaysian Institute of Marine Engineering Technology, Lumut, Perak, Malaysia
Nik Mohd Ridzuan Bin Shaharuddin ; School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
Omar Bin Yaakob ; School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia

* Corresponding author.

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Abstract

This work aims to design a drop tower impact rig to examine the effectiveness of suspension seats for small high-speed passenger crafts and to evaluate whether the designed suspension seat can effectively mitigate the slamming impact on passengers and lower the risk of injuries. A drop tower was fabricated, and drop tests were conducted at different drop heights to simulate base impact acceleration between the range of 3g to 7g. Acceleration data captured using accelerometers were low pass filtered accordingly, and the seat effectiveness and safety were analyzed using the Dynamic Response Index (DRI). The seat’s stiffness was experimentally and theoretically analyzed using Hooke’s Law, and damping values were analyzed using the logarithmic decrement method. The results revealed that DRI values, limited to 18, can only be attained with deck acceleration of less than 6.73g. The tested suspension seat reduced the impact severity by 54 %. This impact mitigation is achievable with an underdamped system of average stiffness and damping rates of 64.8 kN/m and 211 Ns/m, respectively. The research has successfully proved that the fabricated drop tower could simulate the base impact acceleration of desired slamming impact acceleration according to drop heights and that the designed suspension seat can mitigate the severity of the slamming impact effectively.

Keywords

Drop test; suspension seat; high-speed craft; DRI

Hrčak ID:

329825

URI

https://hrcak.srce.hr/329825

Publication date:

1.4.2025.

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