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相关概念视频

Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

397
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...
397
Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
1.1K
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

378
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...
378
Resultant of a General Distributed Loading01:13

Resultant of a General Distributed Loading

990
While designing structures exposed to non-uniform loads, it is crucial to consider the resultant force and its location. This resultant force is a single vector representing the net force applied due to the distributed load.
Examples such as load distribution due to wind and load distribution on a bridge illustrate how this concept is used to analyze and design safe, reliable structures under variable loading conditions. Most structures, such as residential buildings, bridges, and towers, are...
990
Local Attraction01:22

Local Attraction

349
Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
349
Load along a Single Axis01:29

Load along a Single Axis

621
In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
621

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一种修改的近场目标定位方法,基于矢量对角负载.

Qing Ji1, Dawei Xiao2, Lulu Du3

  • 1Naval University of Engineering, Wuhan, China.

Scientific reports
|October 29, 2025
PubMed
概括
此摘要是机器生成的。

这项研究增强了用于水下声学定位的最小变量距离互换 (MVDR) 算法. 通过结合矢量水声机和改进的角度加载技术,它可以在有限的数据下提高性能.

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科学领域:

  • 海洋声学 海洋声学
  • 信号处理 信号处理
  • 阵列信号处理系统的信号处理.

背景情况:

  • 近场最小变量距离互换 (MVDR) 算法性能在有限的采样数据下降.
  • 降解与最佳重量向量和输出功率频谱特征有关.
  • 现有的方法在低快照场景中与分辨率退化作斗争.

研究的目的:

  • 为了提高MVDR算法的稳定性和定位精度,在数据有限的近场场景中.
  • 为解决传统角度加载技术中的分辨率降解问题.
  • 为了提高水下声学目标的定位性能.

主要方法:

  • 集成矢量水声机与改进的角度加载技术.
  • 从最佳重量向量和输出功率频谱的角度分析MVDR性能退化.
  • 开发一种新的角度加载方法,包括使加载特征值成正方形,以创建一个改进的协差矩阵.

主要成果:

  • 提议的改进角度加载算法提高了与传统方法相比的分辨率.
  • 改进的算法表现出与现有技术可比的性能.
  • 模拟和实验数据验证了算法的有效性和稳定性.

结论:

  • 改进的角度加载算法有效地解决了分辨率退化问题.
  • 矢量水声机和增强的角度负载的结合方法适用于近距离水下声学目标定位.
  • 这种方法为具有挑战性的声学定位任务提供了更强大的解决方案.