多目标NSGA-II优化宽带光束形成与球体波域辅助
Zhenghong Liu1,2, Haocheng Zhou1,2, Xiyu Song1,2
1School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China.
Sensors (Basel, Switzerland)
|October 28, 2023
概括
本研究介绍了一种使用NSGA-II用于球形麦克风阵列的新型多目标宽带光束成形方法. 它在具有挑战性的声环境中显著改善侧叶片抑制.
科学领域:
- 声学 声学 在声学方面
- 信号处理 信号处理
- 阵列信号处理 阵列信号处理
背景情况:
- 侧叶片抑制对于声学中的宽带光束成形至关重要.
- 高噪音和反响环境带来了重大挑战.
- 现有的方法在各种声条件下都难以实现最佳性能.
研究的目的:
- 为球形麦克风阵列提出一个多目标NSGA-II宽带光束成形方法.
- 在具有挑战性的声学环境中增强侧叶片抑制.
- 提供三维宽带光束成形能力.
主要方法:
- 使用球形波域进行束形.
- 采用了NSGA-II优化策略与约束.
- 针对白噪声增益,定向指数和最大侧叶水平进行了优化.
- 估计了宽带光束成形的巴雷托最佳解决方案.
主要成果:
- 与单一目标方法相比,在球体律顺序中实现了优异的侧叶抑制.
- 在会议室环境中表现出有效性.
- 在低频率下,获得了8.28dB的白噪声增强和23.42dB的最大侧叶水平.
- 在高频率下,实现了与Dolph-Chebyshev和SOCP相似的方向性指数,同时在白噪声增益 (16.14 dB) 和最大侧叶水平 (-25.18 dB) 中表现优于它们.
结论:
- 拟议的多目标NSGA-II方法为宽带光束成形提供了卓越的侧叶抑制.
- 该方法在现实世界声学条件下有效,包括噪音和反响.
- 这种方法为声学研究提供了强大的解决方案,需要精确的方向控制.
相关概念视频
Deflection of a Beam
270
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
270
Beams with Symmetric Loadings
195
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
The M/EI...
195
Gauss's Law: Spherical Symmetry
7.5K
A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half...
7.5K
Singularity Functions for Bending Moment
235
Singularity functions simplify the representation of bending moments in beams subjected to discontinuous loading, allowing the use of a single mathematical expression. For a supported beam AB, with uniform loading from its midpoint M to the right side end B, the approach involves conceptual 'cuts' at specific points to determine the bending moment in each segment. By cutting the beam at a point between A and M, the bending moment for the segment before reaching midpoint M is represented...
235
Beams with Unsymmetric Loadings
123
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
123
Spherical Coordinates
10.3K
Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
10.3K


