中国舰船研究
中國艦船研究
중국함선연구
CHINESE JOURNAL OF SHIP RESEARCH
2013年
1期
80-83
,共4页
阮竹青%彭伟才%张俊杰%张继明
阮竹青%彭偉纔%張俊傑%張繼明
원죽청%팽위재%장준걸%장계명
边界元%圆柱壳%测点布置%辐射声功率
邊界元%圓柱殼%測點佈置%輻射聲功率
변계원%원주각%측점포치%복사성공솔
BEM%cylindrical shell%the transducer arrangement%radiated sound power
针对基于表面振动的圆柱壳声辐射估算的测点布置问题,提出均匀的测点布置方法.利用有限元法计算大尺度单层加肋圆柱壳在水下振动时的表面速度分布,根据边界元法及各测点处的速度计算不同测点布置对应的辐射声功率,比较各振动测点布置对应的声辐射预测精度,选择合理的测点布置.计算结果表明,对于给定尺寸的结构,在10~125 Hz 范围内,周向和轴向测点数存在最优值(周向12个、轴向5个),当测点数大于最优值时,测点数量的增加不能有效提高声功率的计算精度;当测点数小于最优值时,声功率的计算误差明显增大.在较低的频率范围内,1/6声学波长可作为大尺度结构在水下振动时的测点布置依据.
針對基于錶麵振動的圓柱殼聲輻射估算的測點佈置問題,提齣均勻的測點佈置方法.利用有限元法計算大呎度單層加肋圓柱殼在水下振動時的錶麵速度分佈,根據邊界元法及各測點處的速度計算不同測點佈置對應的輻射聲功率,比較各振動測點佈置對應的聲輻射預測精度,選擇閤理的測點佈置.計算結果錶明,對于給定呎吋的結構,在10~125 Hz 範圍內,週嚮和軸嚮測點數存在最優值(週嚮12箇、軸嚮5箇),噹測點數大于最優值時,測點數量的增加不能有效提高聲功率的計算精度;噹測點數小于最優值時,聲功率的計算誤差明顯增大.在較低的頻率範圍內,1/6聲學波長可作為大呎度結構在水下振動時的測點佈置依據.
침대기우표면진동적원주각성복사고산적측점포치문제,제출균균적측점포치방법.이용유한원법계산대척도단층가륵원주각재수하진동시적표면속도분포,근거변계원법급각측점처적속도계산불동측점포치대응적복사성공솔,비교각진동측점포치대응적성복사예측정도,선택합리적측점포치.계산결과표명,대우급정척촌적결구,재10~125 Hz 범위내,주향화축향측점수존재최우치(주향12개、축향5개),당측점수대우최우치시,측점수량적증가불능유효제고성공솔적계산정도;당측점수소우최우치시,성공솔적계산오차명현증대.재교저적빈솔범위내,1/6성학파장가작위대척도결구재수하진동시적측점포치의거.
A method of transducer arrangements based on BEM is presented in this paper. Firstly,study the amount of transducers of cylindrical shell in axis and circumference directions,then,the optimum transducer arrangement is determined by comparing the prediction accuracy of the radiated sound power under different transducer arrangements. The results show that between 10 Hz and 125 Hz,the optimum numbers of transducers for axial and circumferential directions of a given modal are 5 and 12,respectively. It should be noted that while increasing the number of transducers above the optimum value does not signif?icantly improve the sound power prediction accuracy,choosing a number lower than the optimum value does induce considerable calculation error. Also,this method is only applicable for low frequencies,and the distance between transducers can be confirmed with the corresponding 1/6 wavelength.