This work aims to design a drop tower impact rig examine the effectiveness of suspension seats for small high-speed passenger crafts and evaluate whether designed seat can effectively mitigate slamming on passengers lower risk injuries. A was fabricated, tests were conducted at different heights simulate base acceleration between range 3g 7g. Acceleration data captured using accelerometers low pass filtered accordingly, safety analyzed Dynamic Response Index (DRI). The seat's stiffness...

Abstract A hexagonal modular floating structure (HMFS) system is preliminarily designed in a linear configuration which creates network of connectors. The load the connectors should be able to address issues related layout connector and sustain forces caused by wave motion. This paper presents development HMFS estimation horizontal due direction configurations. design concepts arrangement for configurations are proposed where analysis was carried out regular various directions 0°, 30°,...

This paper presents an active vibration control strategy in order to prevent resonance occurrence marine offshore vertical riser pipe. Experimental data collected by previous research are used as input - output for system identification. Both Least Squares (LS) and Recursive (RLS) methods employed model the dynamic response of pipe at a particular speed. An auto-tuned PID controller algorithm is developed implemented suppression pipe's vibration. The revealed superiority RLS modeling with...

This paper presents a system identification for an elastically supported rigid cylinder in one degree of freedom direction undergoes vortex induced vibration (VIV). The is constrained to oscillate perpendicular with respect free stream. input-output data the vibrating are recorded by using accelerometers capturing movement certain period time. Both developed Recursive Least Square (RLS) and Adaptive Neuro Fuzzy Inference System (ANFIS) modus utilized order model offline dynamic response pipe...

The application of System Identification techniques for modeling a flexible beam structure are presented in this paper. has been widely applied various fields engineering and industrial. However, the is easily influenced by unwanted vibration which may lead to fatigue, performance reduction damage. Thus, must be controlled reduced. In order have good controller suppression, an appropriate model required. Hence, obtain structure, Particle Swarm Optimization (PSO) Artificial Bee Colony (ABC)...

This paper presents the model testing of an 8.23m boat with hard chine planning hull generated waves at Kilim recreational park. Wake is considered one main causes riverbank erosion due to energy carried by hitting riverbank. Initially, ship particulars were measured from actual boats generate a form using MAXSURF software. A lines plan was then fabricate fibreglass. Experiments conducted in National Hydraulic Research Institute Malaysia (NAHRIM) various speeds constant operating draft. The...

Small high speed passenger crafts (HSC) are commonly known for their poor seakeeping qualities. These frequently exposed to large slamming impacts and these repetitive shocks may pose danger passengers’ safety health. In Malaysia, small having lengths between 7 9 meters mainly used transport tourists popular island destinations. Evaluation on impact vibration this type of craft was conducted by using accelerometers attached several locations craft’s deck. The test at speeds ranged 20 30...

This paper presents the fuzzy-PID control of flexibly mounted rigid pipe which undergoes vortex induced vibration phenomena. The cylinder is allowed to move in one direction perpendicular flow direction. input and output data are obtained from experimental works where current speed acceleration pipe. Auto-Regressive External Input (ARX) model used as transfer function structure whereas Recursive Least Square (RLS) technique adopted order determine parameter ARX model. Fuzzy-PID controller...

The hydrodynamic behavior of underwater vehicles is crucial for achieving optimal maneuverability and energy efficiency in various environments, thereby ensuring effective operations. This research addresses the drift characteristics an vehicle by conducting Computational Fluid Dynamics (CFD) simulations. DARPA Suboff model was used to analyze its maneuvering under static conditions at a velocity 3.34 m/s angles ranging from 0 18 degrees with 2-degree intervals. simulations replicate actual...

This paper presents the development of hexagonal modular floating structure (HMFS) connector network and determination impact horizontal force using four types configurations which are U-shaped, VP-shaped, VV-shaped centre layout connect three modules that form a connectors. The forces exerted on from wave motion highlights importance understanding dynamic load interactions between HMFS. Simulation works were conducted for regular waves in following directions: 0o,30o,45o,60o,85o, 90o....

This study presents development of approaches with cuckoo search algorithm (CS) and differential evolutionary (DE) for modelling flexible single-link manipulator system (FSLMS). Details simulation study, model selection, optimization result analyses are given in this study. A mathematical a (FSLMS) has been developed modelled as pinned-free, an Euler-Bernoulli beam using finite element method (FEM) based on Lagrangian approach analysis. bang-bang input torque was applied the dynamic response...

This paper presents the application of Fuzzy Iterative PID-Type controller in suppressing vortex induced vibration a flexibly mounted cylindrical pipe. A pair input and output data, which are water flow speed amplitude, respectively have been measured through experimental work generating linear autoregressive with exogenous input, ARX model. Recursive least square was utilized determining appropriate parameters stated It found that 2nd model order had fulfilled selection requirements,...

Abstract Modular floating structures are normally made up of modules which connected using network connectors. These connectors prone to heavy load due facing the open sea wave. Previous studies have examined simple module configuration such as two rectangular form arranged linearly or three seven hexagonal in an oblique pattern experimentally CFD and FE packages. Two challenges persist afterward; firstly, on applying current findings topology a bigger number secondly estimating axial values...