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2results about How to "Overcome distance" patented technology

Double eccentric adjustable vibration mechanism, steel wheel roller and road roller

ActiveCN224548901UChange the exciting forceovercome distanceStructural engineeringMechanical engineering
The utility model discloses a double eccentric adjustable vibration mechanism, steel wheel drum and road roller, double eccentric adjustable vibration mechanism includes pivot, fixed eccentric disc, adjustable eccentric disc and adjusting disc, pivot coaxial rotation is sleeved with protection box, and protection box is equipped with vibration cavity, fixed eccentric disc is sleeved with pivot and is fixedly connected, adjustable eccentric disc is sleeved with pivot, and adjustable eccentric disc is provided with a plurality of positioning protrusions, adjusting disc is coaxial rotation and is sleeved with pivot, and is located between fixed eccentric disc and adjustable eccentric disc, and adjusting disc is connected through a plurality of reset springs, adjusting disc is provided with a plurality of positioning slot holes, and positioning slot hole is set up with positioning protrusion correspondingly. It can solve the problem of the insufficient compaction degree, excessive compaction, limited excitation frequency adjustment range of the vibration mechanism for the steel wheel type vibration road roller, and is not conducive to meeting the higher requirements of compaction degree precision and efficiency in complex construction environment.
Double eccentric adjustable vibration mechanism, steel wheel roller and road roller
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Owner:中铁科学研究院集团有限公司

A method for suppressing direct wave based on fractional fourier transform in bistatic sonar

ActiveCN116148866BReduce the masking area of ​​the direct waveDirect wave suppressionWater resource assessmentAcoustic wave reradiationForward scatterTime domain
Aiming at the problem of detection blind area caused by strong direct wave interference in bistatic imaging sonar system, a narrow-band filtering method based on fractional Fourier transform domain is proposed. The characteristic of linear frequency modulation signal is that it appears as an impulse in the fractional Fourier transform domain at its best transform order. The fractional Fourier transform of the best order is performed on the element domain signal to separate the direct wave from the echo. Then the direct wave is eliminated in the fractional Fourier transform domain. Finally, the forward scattering time domain signal of the seabed is reconstructed by fractional inverse Fourier transform. Further, the acoustic imaging processing is performed on the signal processed by fractional filtering, and the acoustic imaging result after direct wave suppression is obtained. Compared with the traditional bistatic sonar imaging, the method can effectively suppress the direct wave, reduce the direct wave masking area in the bistatic acoustic imaging, and improve the detection blind area problem caused by the direct wave in the traditional bistatic sonar imaging.
A method for suppressing direct wave based on fractional fourier transform in bistatic sonar
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Owner:NORTHWESTERN POLYTECHNICAL UNIV