基于最佳逼近理论的主动吸收造波算法研究
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摘要
在海洋工程水池试验中,二次反射波会严重影响实验的可靠性和准确性,如何消除反射波成为一个重要课题。针对MARINTEK水池为仿真对象展开相关研究,运用目前较为成熟的主动吸收造波算法理论,解算摇板式造波机的传递函数,在此基础上应用最佳逼近理论,设计出相应的数字滤波器,来达到同等的主动吸收造波效果,并验证该方法的有效性,从而实现模拟滤波器向数字滤波器的转换。仿真结果显示,数字滤波器输出与标准(主动吸收造波算法理论)输出有着良好的拟合效果,表明所设计的数字滤波器能够到达预期的主动吸收造波效果。本研究的意义在于,初步实现了主动吸收造波算法从理论到实际应用的转换,为工程上的应用提供良好的依据,有助于提高波浪试验的准确性。
There are some serious impacts on the reliability and accuracy of test due to the second wave reflection during the tank testing,thus,how to eliminate the wave reflection becomes an important subject. Aiming at the MARINTEK tank,research is carried out,applying the mature theory of active absorption algorithm,resolving the transfer function of the flap type wave maker,based on the best approximation theory,designing an appropriate digital filter to meet the effect of active absorption wave making,and verifying effectiveness of this algorithm. The result of simulation shows that the output of digital filter and standard( the theory of active absorption algorithm) get good fitting,which indicates the digital filter can achieve the effect of active absorption wave making,thus preliminarily realizing the transform active absorption algorithm to practical application,which contributes to develop the accuracy of wave test.
There are some serious impacts on the reliability and accuracy of test due to the second wave reflection during the tank testing,thus,how to eliminate the wave reflection becomes an important subject. Aiming at the MARINTEK tank,research is carried out,applying the mature theory of active absorption algorithm,resolving the transfer function of the flap type wave maker,based on the best approximation theory,designing an appropriate digital filter to meet the effect of active absorption wave making,and verifying effectiveness of this algorithm. The result of simulation shows that the output of digital filter and standard( the theory of active absorption algorithm) get good fitting,which indicates the digital filter can achieve the effect of active absorption wave making,thus preliminarily realizing the transform active absorption algorithm to practical application,which contributes to develop the accuracy of wave test.
引文
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[8]王世一.数字信号处理[M].北京:北京理工大学出版社,2010:217-225.WANG Shi-yi.Digital signal processing[M].Beijing:Beijing Institute of Technology Press,2010:217-225.
[2]HIRAKUCHI H,KAJIMA R,KAWAGUCHI T.Application of a piston-type absorbing wave maker to irregular wave experiments[J].Coastal Engeering in Japan,1990,33(1):11-24.
[3]柳淑学,吴斌,李木国,等.无反射不规则波造波机系统的研究[J].水动力学研究与进展(A辑),2003,18(5):534-539.LIU Shu-xue,WU Bin,LI Mu-guo,et al.Irregular active absobing wave maker system[J].Chinese Journal of Hydrodynamics,2003,18(5):534-539.
[4]SCHFFER H A,STOLBORG T,HYLLESTED P.Simultaneous generation and active absorption of waves in flumes[C]//Proc.,Waves-Phys.Numer.Modelling,Dept.of Civ.Engrg.,University of British Columbia,Vancouver,1994:90-99.
[5]顾民,胡启庸,孙强,等.具有ARC功能的摇板式造波机的应用研究[J].船舶力学,2005,9(4):46-52.GU Min,HU Qi-yong,SUN Qiang,et al.Research of application on a ARC flap-type wave maker[J].CSSRC Reports,2005,9(4):46-52.
[6]CHRISTENSEN M,FRIGAARD P.Design of absorbing wavemaker based on digital filters[C]//Proc.,WavesPhys.and Numer.Modelling.Vancouver,1994:100-109.
[7]URSELL F,DEAN RG,YU Y S.Forced small-amplitude water waves:a comparison of theory and experiment[J].Journal of Fluid Mechanics,1960,7(1):33-52.
[8]王世一.数字信号处理[M].北京:北京理工大学出版社,2010:217-225.WANG Shi-yi.Digital signal processing[M].Beijing:Beijing Institute of Technology Press,2010:217-225.