Sea surface scaling simulation method and test system based on jonswap sea spectrum

Abstract

The invention relates to a sea surface scaling simulation method based on JONSWAP sea spectrum and a test system. The method comprises the following steps: carrying out linear scaling on wave height to obtain a scaling coefficient p; adjusting attitude of a pitch angle of a static electromagnetic scattering measurement system; according to task required test frequency f, setting test frequency of the static electromagnetic scattering measurement system to be p*f; lifting the static electromagnetic scattering measurement system to the place above water surface of a wave generation pool; according to task required test height H, setting the lift actual test height to be H / p; according to task required simulated peak rise factor gamma, fetch length X and wind speed U, setting peak rise factor during actual test to be gamma, fetch length to be X / p and wind speed to be U / (the square root of p), and carrying out simulation by utilizing marine environment simulation facilities in the wave generation pool to form a sea surface based on the JONSWAP sea spectrum; and carrying out sea clutter static electromagnetic scattering characteristic test by utilizing the static electromagnetic scattering measurement system. The method can simulate high-sea-condition sea waves by utilizing the existing wave generation pool generating low / medium-sea-condition waves, and scaling of the JONSWAP spectrum is realized.

Description

technical field [0001] The invention relates to a sea clutter static electromagnetic scattering characteristic simulation test technology, in particular to a sea surface reduction simulation method and a test system based on JONSWAP sea spectrum. Background technique [0002] The external field measurement of electromagnetic scattering on the sea surface has poor controllability, and the cost is huge, which cannot meet the needs of a large number of tests. Using the inland sea clutter simulation system in the laboratory, the controllable sea clutter simulation measurement research can be carried out in the laboratory by means of artificial wave generation. [0003] JONSWAP sea spectrum is a commonly used sea spectrum for artificial wave simulation. Related patents and papers have detailed discussions on the simulation of JONSWAP spectrum. However, due to the limitation of the wave-making ability of the wave-making system, artificially simulated sea conditions are limited. ,...

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Problems solved by technology

[0003] JONSWAP sea spectrum is a commonly used sea spectrum for artificial wave simulation. Related patents and papers have detailed discussions on the simulation of JONSWAP spectrum. However, due to the limitation of the wave-making ability of the wave-making system, artificially simulated sea conditions are limited. , it is impossible to directly carry out the simulation test of full-scale high sea conditions, and currently only the simulation test of the sea conditions below level 3 can be carried out

The method of artificially reducing the scale of the wave pool to simulate high sea conditions is still in the blank stage, and it is also one of the difficulties in carrying out sea surface simulation tests.

[0004] Shandong University has proposed a hydraulically controlled tank-type wave-making device and method in the patent "A hydraulically controlled tank-type wave-making device and method" (public number: CN105823698A, application number: CN201610164488.0), including test channels, Hydraulic jacks, transmission rods, etc., adjust the impact of the cylindrical punching box with the water surface to generate waves. The waves generated by the arc structure of the punching box are closer to natural waves, but the size of the water channel is small, which is not conducive to the test of electromagnetic scattering characteristics. and Wave Pool Simulation Method for Scaled Waves

[0005] China Three Gorges University proposed an experimental push-plate wave-simulating water tank in the patent "An Experimental Push-Plate Type Wave Simulation Tank" (publication number: CN204612896U, patent application number: CN201520366830.6), including a water tank, a wave-dissipating wedge, Servo motors, etc., can form waves for simulation tests, and the patent does not mention the method of indoor wave reduction

But there is no mention of the scaling method of the JONSWAP spectrum

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