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井壁附近偏心声源在井壁上激发的声场数值研究 被引量:1
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作者 沈建国 陈宇 张海澜 《测井技术》 CAS CSCD 2002年第3期184-186,共3页
根据井内偏心声源激发的二维声场及井壁不同位置的波形可以在井壁上激发环绕井壁传播纵波、横波及其它面波的理论 ,用实轴积分法计算了位于井壁附近的声源在井内液体和固体界面上激发的声场 ;结合液体与固体中的二维声场分布特征 ,探讨... 根据井内偏心声源激发的二维声场及井壁不同位置的波形可以在井壁上激发环绕井壁传播纵波、横波及其它面波的理论 ,用实轴积分法计算了位于井壁附近的声源在井内液体和固体界面上激发的声场 ;结合液体与固体中的二维声场分布特征 ,探讨了测量地层水平或接近地层水平方向声速的可能性 ;由三维计算结果显示井壁上不同时刻的声场分布 ,直观显示各种波在不同水平面、不同方位角处的幅度分布 ,得到了纵波。 展开更多
关键词 井壁附近偏心声源 井壁 激发 声场数值 声波测井 纵波 横波 声场分布
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无网格法及其在声场数值计算中的应用
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作者 王海涛 曾向阳 《电声技术》 2010年第12期10-15,共6页
无网格法是一种新兴的数值计算方法,具有独特的性质。简述了无网格法的理论基础及其所具有的优势,详细介绍了几种常用的无网格算法,并以移动最小二乘近似法为重点,对无网格法中的形函数构造作了详细论述。最后,分析了无网格法在小尺度... 无网格法是一种新兴的数值计算方法,具有独特的性质。简述了无网格法的理论基础及其所具有的优势,详细介绍了几种常用的无网格算法,并以移动最小二乘近似法为重点,对无网格法中的形函数构造作了详细论述。最后,分析了无网格法在小尺度封闭空间声场数值计算中的应用。 展开更多
关键词 无网格法 形函数 声场数值计算
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环境与噪声
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作者 蒋孝煜 《国际学术动态》 1994年第2期103-104,共2页
关键词 环境 噪声控制 声场数值 计算 测量
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A numerical study of a turbulent mixing layer and its generated noise 被引量:4
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作者 LI Dong GUO Li +1 位作者 ZHANG Xing HE GuoWei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第6期1157-1164,共8页
A direct numerical simulation of a turbulent mixing layer with the Reynolds number 500 and the convective Mach number 0.6 is performed and the results obtained are used to study the turbulent flow field and its genera... A direct numerical simulation of a turbulent mixing layer with the Reynolds number 500 and the convective Mach number 0.6 is performed and the results obtained are used to study the turbulent flow field and its generated noise.In the present simulation,the numerical techniques of absorbing buffer zones,artificial convection velocity and spatial filtering are used to achieve nonreflecting boundary conditions.The self-similarity is used to validate the present numerical simulations.The large-scale coherent structures are plotted together with the acoustic waves,which demonstrates the directivity of acoustic waves.The Lighthill's source and space-time correlations are further investigated.The main contributions to mixing noise are identified in terms of large-scale coherent structures,Lighthill's source and space-time correlations. 展开更多
关键词 direct numerical simulation mixing layer space-time correlation noise
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Exact solution of three-dimensional acoustic field in a wedge with perfectly reflecting boundaries
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作者 LUO WenYu ZHANG RenHe 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第9期29-38,共10页
An exact approach is presented to compute the three-dimensional(3D) acoustic field in a homogeneous wedge-shaped ocean with perfectly reflecting boundaries. This approach applies the Fourier synthesis technique, which... An exact approach is presented to compute the three-dimensional(3D) acoustic field in a homogeneous wedge-shaped ocean with perfectly reflecting boundaries. This approach applies the Fourier synthesis technique, which reduces a 3D point-source ideal wedge problem into a sequence of two-dimensional(2D) line-source ideal wedge problems, whose analytical solution is well established. A comparison of numerical efficiency is provided between this solution and the solution proposed by Buckingham,which is obtained by a sequence of integral transforms. The details of numerical implementation of these two solutions are also given. To validate the present approach and at the same time compare numerical efficiency between this approach and Buckingham's analytical solution, two numerical examples are considered. One is the Acoustical Society of America(ASA) benchmark wedge problem and the other is a wide-angle wedge problem. Numerical results indicate that the present approach is efficient and capable of providing accurate 3D acoustic field results for arbitrary receiver locations, and hence can serve as a benchmark model for sound propagation in a homogeneous wedge-shaped ocean. 展开更多
关键词 three-dimensional acoustic field wedge-shaped ocean perfectly reflecting boundaries
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