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Interaction of Irregular waves with Vertical Breakwater and Characteristics of secondary wave Generated by Overtopping

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Journal of Ocean University of China 2021年第6期20卷 1353-1370页

作者： HAN Xinyu JIANG Yunpeng DONG Sheng College of Engineering Ocean University of ChinaQingdao 266100China Tianjin Research Institute for Water Transport Engineering Tianjin 300456China

This study investigated the interaction between irregular waves and vertical *** main goal was to determine the wave force on the breakwater for different depths,along with the evolution of the secondary wave generated by *** open source code DualSPHysics was used in the *** transform was employed to remove the acoustic components from the weakly compressible smoothed particle hydrodynamics pressure *** results of the experiments and simulations showed that although the wave height at the low water level(case 2 was smaller than that at the high water level(case 1,the horizontal and uplifting force of case 2 was higher than that of case *** case 2,a large impact pressure occurred because of the plunging wave and wave breaking *** the water level was close to the breakwater top in case 1,the secondary wave generated by overtopping was *** indicated that wave and breakwater interactions transfer wave energy from the leading wave component to higher *** main harmonics were identified in the secondary *** first harmonic was the incident peak frequency,which was still the dominant *** the wave propagation behind the breakwater,the frequencies of harmonics remained unchanged,but the amplitude of the first harmonic showed an obvious *** the same wave condition,the first and second harmonics did not change with depth.

关键词： irregular waves vertical breakwater wavelet wave force secondary wave

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THEORETICAL ANALYSIS AND EXPERIMENTAL VERIFICATION ON TERNARY-waveS METHOD TO COMPILE ACCELERATED SPECTRA

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Chinese Journal of Mechanical Engineering 2002年第4期15卷 308-313页

作者： Xiong Junjiang Wu Zhe Gao ZhentongAircraft Design Bureau, Beijing University of Aeronautics and Astronautics,Beijing 100083, China Aircraft Design Bureau Beijing University of Aeronautics and Astronautics 北京 100083

The equivalent damage calculation formulae of fatigue crack formation andgrowth are established. In order to compile the fatigue crack formation and growth accelerated loadspectra, the main wave shapes and load sequence of the actual load spectrum are kept constant, andthe carrier waves are cut off. And secondary waves are put together into new secondary waves toshorten the test time according to the equivalent damage calculation formulae respectively. Then bythe fatigue cumulative damage calculation of the fatigue crack formation and growth accelerated loadspectra, the one corresponding to the bigger damage is determined as the fatigue accelerated testload spectrum. Therefore in the test process, the fatigue accelerated test spectrum may be appliedtill fatigue failure, the engineering fatigue crack length of full-scale structure need not beinspected, and the fatigue crack formation accelerated load spectrum need not be transferred intothe fatigue crack growth accelerated load spectrum. Finally, it is verified by tests of two kinds ofspecimens that the damages of the specimens caused by the accelerated load spectra are near tothose by the actual load spectra; namely, the tested life of actual load spectra is similar to thatof accelerated load spectra. But the test time of accelerated load spectra is shortened by aboutthree-quarters that of actual load spectra. From these tests, it is also found that the fatigueaccelerated test spectrum has an advantage over FALSTAFF spectra.

关键词： ternary-waves actual load-time history accelerated load spectra equivalent damage calculation main wave secondary wave carrier wave

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Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact

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Journal of Flow Control, Measurement & Visualization 2016年第2期4卷 49-55页

作者： Kei Fujisawa Akira Asada Department of Ocean Technology Policy and Environment The University of Tokyo Tokyo Japan Institute of Industrial Science The University of Tokyo Tokyo Japan

A novel technique for reducing reverberation artifact in acoustic shadow imaging using nonlinear ultrasound interaction, called nonlinear acoustic shadow method, has been developed and experimentally studied. In this technique, the conventional acoustic shadow method is modified by using the secondary wave generated by nonlinear interaction of two primary sound waves emitted from parametric array. Either conventional or nonlinear acoustic shadow imaging is carried out for aluminum square cylinder and the size of the shadow is compared. The result shows that the nonlinear acoustic shadow method reduces reverberation artifact inside the square cylinder and has better accuracy in the size measurement than conventional acoustic shadow method.

关键词： Acoustic Shadow Method Reverberation Artifact Nonlinear Ultrasound Parametric Array secondary wave

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