几何屏蔽声源的声学成像使用量身定制的绿色的功能
Lican Wang1, Zhenjun Peng1, Bao Chen2
1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region of China.
The Journal of the Acoustical Society of America
|November 11, 2024
概括
本研究介绍了一种声学成像方法,用于精确确定复杂环境中的飞机噪声源. 该技术通过考虑声波散射效应来增强源定位,改善故障监测能力.
科学领域:
- 声学 声学 在声学方面
- 航空航天工程 航空航天工程
- 信号处理 信号处理
背景情况:
- 城市空气流动需要在复杂的飞机环境中准确检测噪音源.
- 像机身和发动机这样的飞机结构会产生显著的声波散射,使噪音源的定位变得复杂.
- 现有的光束成形技术与散射效应作斗争,限制了精确的噪声源识别.
研究的目的:
- 开发一种先进的声学成像方法,将声学散射效应纳入其中,以改进噪声源检测.
- 提高在具有结构散射器的环境中定位静止和移动噪声源的分辨率和精度.
- 为城市空气流动应用提供有效的声学测量和故障监测技术.
主要方法:
- 将传统和基于波形的光束成形与声学散射预测相结合.
- 数字评估量身定制的格林的功能,以计算转向向量和时间延迟.
- 分析光束成形性能在场景中,散射器位于源和阵列平面之间.
主要成果:
- 散射环境中的光束成形与自由空间传播不同,从而产生更好的分辨率.
- 观察到分散诱导的侧叶,需要仔细解释.
- 通过数值模拟和实验研究验证了开发方法的有效性.
- 在屏蔽环境中证明了静止和旋转声源的改进本地化.
结论:
- 开发的声学成像方法有效地定位在结构分散的情况下的噪声源.
- 这种方法为城市空中交通中的声学测量和故障监测提供了显著的进步.
- 这些发现证实了考虑散射效应对于准确的声源识别的重要性.
相关概念视频
00:53Sound Intensity Level
Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...
01:05Difference from Background: Limit of Detection
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
The LOD indicates the presence or absence...
01:19Masking and Demasking Agents
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There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
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01:05Intensity and Pressure of Sound Waves
The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
Unlike the time average of a sinusoidal term, which is zero since it is positive and...
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01:18Sinusoidal Sources
Direct current (DC) refers to an electric current that flows in a single direction, maintaining a constant polarity. This is in contrast to alternating current (AC), which periodically changes its direction and magnitude. AC forms the backbone of modern electricity transmission and distribution systems due to its efficient long-distance transmission capabilities.
In homes, the power supplies use sinusoidal sources to provide electricity. These sources generate a voltage that varies sinusoidally...
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01:21Perceiving Loudness, Pitch, and Location
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
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