Abstract
Ocean wave parameters, including wave height, direction and period, are necessary to improve forecasts of ocean wave conditions. Their accurate observation contributes to safety of both offshore operations and military operations. However, conventional wave observation methods that combine the three-axis accelerometer-based wave sensor with the gyroscope may show problems such as inner arm error, transverse sensitivity effect, and gyroscope drift. The first two are due to non-coincidence of centroids inside the accelerometer. Such problems will reduce reliability of data. To solve the problems, a new type of parallel six-dimensional accelerometer is developed to reduce principle errors and improve stability of wave buoys. The solution features a single mass and 12-chain redundancy. When compared with the performance of high-precision sensors in the wave pool, the wave buoy based on six-dimensional accelerometer is proved to be more accurate in wave height measurement than 3.75 % × measurement value, with wave direction accuracy of ± 1°, and the wave period measurement accuracy of ± 0.1s.
Highlights
Ocean wave characteristics, including wave height, direction and period, are vital for ocean development, waterborne transport, national defense and marine disaster prevention, so it is highly valued by marine scientific research [1]
TRIAXYS Directional Wave Buoy consists of three accelerometers, three gyroscopes, and an electronic compass
The results of wave height from our system overlapped those from the TRIAXYS MINI buoy, as can be shown in the curve below
Summary
Ocean wave characteristics, including wave height, direction and period, are vital for ocean development, waterborne transport, national defense and marine disaster prevention, so it is highly valued by marine scientific research [1]. TRIAXYS Directional Wave Buoy consists of three accelerometers (three sensors are placed orthogonal), three gyroscopes, and an electronic compass It provides continuous wave sampling of six parameters (X, Y, Z-axis acceleration and dip), under the motion of 8 Hz. A PC-104 microprocessor in the buoy could take samples, process data, and store information at the same time. The design has a compact topological structure, good decoupling property, wide operating frequency band, and low processing cost, avoids the lever arm effect and lateral sensitivity effect of the combination of three accelerometers 2) The sensor system consists of a parallel piezoelectric six-dimensional accelerometer and a signal processor, collecting wave acceleration signals. The accelerometer consists of a mass, elastic ball hinges, piezoelectric ceramics, pre-tightening columns, preload plates, sub boards, and a shell It has one inertial mass and twelve identical branches.
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