Abstract The aim of this work is to study the influence chamfered perforation and chamfering on heave pitch motion a single floating wind power platform with an anti-heave device. Firstly, hydrodynamic performance body different chamfers, or without perforation, calculated analysed. Secondly, model 35° captured studied in towing tank. results show that when wave height large period small, perfo...

The maneuverability demonstrated by the weakly electric ghost knifefish (Apteronotus albifrons) is a result of its highly flexible ribbon-like anal fin, which extends nearly three-quarters the length of its body and is composed of approximately 150 individual fin rays. To understand how movement of the anal fin controls locomotion we examined kinematics of the whole fin, as well as selected ind...

This embedded module measures significant wave height and zero crossing periods through spectral energy from a record of time series heave motion. An ARM7TDMI core microcontroller serves as the main control unit which performs the appropriate control and signal conditioning. Monitored wave characteristic is transmitted with satellite modem. Mathematical equations on signal conditioning and expe...

Pinisi ships are famous for their toughness across the ocean. The uniqueness of is shipbuilding methods that different without design engineering. conditions present pinisi tourist ships, problems have arisen recently, namely number ship accidents. main cause bad water and technical factors. To improve safety comfort, aspect needs to be studied hydrodynamic characteristics. subject uses three s...

Abstract: Aerodynamics and motion performance of the floating vertical wind turbine (VAWT) were studied in this paper, where the wind turbine was H-type and the floating foundation was truss spar type. Based on the double-multiple-stream-tube theory, the formulae were deduced to calculate the aerodynamic loads acting on the wind turbine considering the motions of the floating foundation. The su...

Frost heave, which is the volumetric expansion of frozen soil, has great ecological significance, since it creates water storage spaces in soils at the beginning of the growing season in cold temperate forests. To understand the characteristics of frost heave in seasonally frozen soil and the factors that impact its extent, we investigated the frost heave rates of forest soil from different dep...

Walking speed is a very important factor in evacuation analysis for human safety. To provide against emergencies such as abandonment of ship due to accident, the authority body required evacuation analysis for passenger ships. To develop a simulation tool for the evacuation analysis, human behavior data for evacuation situations are fundamentally necessary. In this paper, onboard experiments we...

The International Maritime Organization (IMO) finalized the second-generation intact stability criteria in 2022. However, an accurate and practical numerical method for loss has yet to be established. Therefore, a 6 DOF model is further improved based on previous study. Firstly, rolling motion simulated using seakeeping instead of maneuvering mathematical model. Secondly, roll-restoring variati...

The aim of this paper is to solve optimal design problems for industrial applications when the objective function value requires the evaluation of expensive simulation codes and its first derivatives are not available. In order to achieve this goal we propose two new algorithms that draw inspiration from two existing approaches: a filled function based algorithm and a Particle Swarm Optimizatio...