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Parameter-setting of hydrodynamic calculation.
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The hydrodynamic performance of the floating body in seawater is very important. The wave buoy is a small buoy that measures wave parameters such as wave height and wave direction, for the non-powered wave buoy, the hydrodynamic performance mainly refers to the seaworthiness of the buoy body. Seakeeping refers to the motion law of the floating body...
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... substituting the above values, the radius of the traversal moment of inertia of the model can be obtained. We set other parameters as shown in Table 2: The software calculates the RAO response curves of the model in both the vertical and horizontal directions, as shown in Figures 3 and 4. (a) (b) Figure 3. The hydrodynamic response curve of cylindrical buoy body. ...Similar publications
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... Recent research has emphasized the importance of shape and mass distribution in determining hydrodynamic response. A comparative study of hydrodynamic performance in cylindrical and spherical wave buoys demonstrated that structural differences influence RAO values, affecting measurement accuracy and buoy response under wave conditions (Zheng et al., 2023). Similarly, experimental analyses on a biofouled wave buoy highlighted the impact of marine growth on buoy stability, revealing that biological fouling alters motion characteristics and affects data reliability over time (Islam et al., 2020). ...
Seakeeping performance and hydrodynamic response play a critical role in the design and operation of ocean buoys used in offshore applications. Ocean buoys are widely used for offshore monitoring, wave energy harvesting, and marine navigation, where maintaining stable hydrodynamic behaviour is essential. Their seakeeping performance-defined by stability, motion response, and resistance to environmental loads-determines the effectiveness and durability of these systems. This study addresses the need for experimentally validated data to improve buoy design under realistic sea conditions. A 1:5 scale model of a floating ocean buoy was experimentally analysed under irregular wave conditions. The moment of inertia was calculated using the bifilar pendulum method, which provided accurate values for both the buoy and associated setup components. Wave calibration was carried out via Power Spectral Density (PSD) analysis using the Welch method, producing a significant wave height of 120 mm and closely matching the JONSWAP spectrum, thus ensuring realistic hydrodynamic conditions. To evaluate motion behaviour, Response Amplitude Operators (RAOs) were measured using optitrack motion sensors and cross-spectral density analysis. The results revealed strong frequency-dependent resonance in heave RAO (140.84 and 18.28), indicating amplified vertical motion at certain wave frequencies. In contrast, pitch RAO values were significantly lower (9.002 × 10⁻⁵ and 4.6907 × 10⁻⁵), confirming minimal angular instability. These findings suggest that while the buoy exhibits notable heave response under resonant frequencies, it maintains excellent pitch stability-an advantageous trait for offshore deployment. The study demonstrates the importance of mass distribution, spectral calibration, and frequency response analysis in buoy design. Research Aim: The aim of this research is to identify the effect of irregular wave conditions on the seakeeping behaviour and stability of an ocean buoy. To achieve this, the study focuses on assessing the interaction between wave forces and the buoy's motion response, as well as evaluating the impact of mass inertia and wave calibration on its overall hydrodynamic performance.
