... government sea condition heave motion investigation united kingdom government vehicle wave frequency propulsion glider head sea condition domain analysis new concept passenger transportation natural frequency encounter frequency pitch motion fft analysis wave-propelled autonomous surface...

... for the most severe sea state. Here, the wave-induced vertical heave and pitch motions, which are the most significant motions in the head sea, are addressed. Based on the current wave elevation and total nonlinear history, the differences between the total nonlinear and linear motions, namely nonlinear...

... in Fig.3, four control parameters are set in arranging the mesh grids including ranges of free surface, numbers of nodes over free surface, ranges of control surface and number of vertical layers of nodes on control surface. Heave and pitch motions of Wigley-III at condition / L = 1.0 , Fn = 0.30...

.... The potentiometer was used to measure the roll and pitch motion of the ship. Two load cells were attached between the ship bottom and the heave rod to measure the wave forces acting on the ship hull. Firstly, the pitch RAO and added resistance without the LNG tank are compared with the results from available...

... ABSTRACT Trimaran vehicles may suffer coupled motions of roll and pitch when navigating in oblique head waves, which will lead to negative effect on navigation safety and comfort. The anti-motion appendage, such as T-foil, may have a positive effect on reducing the roll and pitch motions...

... effects on the ship performance in head and oblique seas. Effects of controllers As shown in Fig. 4, time signals of a head sea case are presented to show the effects of propeller controller on ship forward speed, added force, heave, and pitch motion. The propeller revolution rate n is also shown in every...

... denotes that the semi- submersible is in the hogging or sagging state. frequency component in the time history of pitch motion at L / L0 =1.0, which is close to the natural frequency of pitch motion, and the lowfrequency component accounts for an increasing proportion in pitch motion, which may cause...

... be the restoring coefficient for pitching motion, for which the circular TALOS is 20.37% higher, due to the fact of the pitching restoring force is related to the moment of the water area (the circular TALOS has a larger water area than the original one). For having reasonable comparisons, all given parameters...

... = 0.008, 0.005 and 0.0025s. The results are compared in terms of the surge, heave and pitch and can be seen in Figs. 3 and 4 . A good agreement is noted between all configurations, especially in heave and pitch motions. In the surge direction, small deviations are noted that are considered insignificant...

.... Firstly, the verification and validation of the wave height is conducted. Secondly, the simulation results of three-degrees-of freedom (3-DOF) motion response (roll, heave and pitch motions) are presented. The heave and pitch RAOs under different wave frequencies are examined in accordance...

... in the vertical plane, namely heave, roll and pitch. The roll and pitch motion are characterized by low-frequency narrow-band resonances. The linear potential flow analysis has been adopted as a common practice for airgap prediction, but the full calculation of the quadratic transfer functions (QTFs) is becoming...

... control surface application marine transportation resistance experiment data hydrodynamic analysis order force wigley-iii pitch motion field method multi-domain method calculation ship hull incident wave boundary condition ocean engineering wave resistance rankine panel method force...

... verification is carried out. Then, the seakeeping performance of the trimaran on different wavelengths is carried out by numerical methods, and the calculation results including heave and pitch motion of trimaran are compared with the experimental results. Studies have shown that the amplitudes of heave...

... block effects. Given pitch motion amplitude ( θ 0 ), the thrust coefficient of flapping foil increases as the increase of Strouhal number St . The thrust coefficient decreases as the increase of θ 0 , and the maximum propulsion efficiency is achieved at higher St . INTRODUCTION The propulsion...

..., and carried out the physical model experiment of the section. upstream oil & gas platform pitch motion breakwater layout breakwater floating production storage & offloading layout entrance asymmetric arrangement amplitude wave height floating production system subsea system cover...

... wind energy surge motion wind load case 2 offshore wind turbine foundation lc1 simulation sustainability fowt sustainable development oo-star floater pitch motion dynamic response heave motion time sery segment lc2 Proceedings of the Thirty-second (2022) International Ocean and Polar...

... acceleration of pitch motion in the For each wave case, the accelerometers recorded the response of the free-decay test. structure in all three axes of motion (one accelerometer per axis). The acceleration power spectrum of the linear motions originated from the Table 5. Natural frequency of OWT motions...

..., which is caused by the large-scale wave need enough space and time to generate and absorb completely. fpso floating production storage and offloading free surface tendency floating production storage & offloading engineering mesh qalefoam wind energy renewable energy pitch motion...

... for loading condition: = 7m/s, = 6.75m, = 9.3s. To limit the angle at the mooring line connection, the mean platform The time history plots predicted by the FNPT wave model presented in offset should not exceed 5% of water depth. Fig. 10b), c), and d) showed positive drift for surge and pitch motion whereas...

... numerical results are analyzed to research the coupled motion and ignoring the viscidity of fluid. Liu C. 2017 predicted the motion characteristics and motion states. The results show that pitch motion of trimaran is smaller at short wave condition, but the rolling motion shows of DTC in different wave...