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相关概念视频

Vibrating Concrete01:19

Vibrating Concrete

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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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相关实验视频

Updated: Jan 29, 2026

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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基于ICFO-SVMD和改进的波段值的振动信号否定方法.

Yanping Cui1, Xiaoxu He1, Zhe Wu1

  • 1School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.

Sensors (Basel, Switzerland)
|January 28, 2026
PubMed
概括
此摘要是机器生成的。

一种新的关节消噪方法有效地消除了旋转机械振动信号的噪声. 这种方法通过保留弱故障特征来提高诊断可靠性,从而改善机械健康监测.

关键词:
拒绝的意思是拒绝.改进的冠状腺菌优化算法 (ICFO)改进了波段值的使用.连续的变化模式分解分解.振动信号表示振动信号.

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相关实验视频

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科学领域:

  • 机械工程 机械工程
  • 信号处理 信号处理
  • 计算智能是一种计算智能.

背景情况:

  • 旋转的机器产生非静止的,多元件的振动信号.
  • 强大的背景噪音往往掩盖了关键故障特征,降低了诊断准确度.
  • 现有的无声化方法与复杂的噪声干扰作斗争.

研究的目的:

  • 为受污染的振动信号开发一种先进的关节消噪方法.
  • 为了提高旋转机械故障诊断的可靠性.
  • 为了提高对弱故障信号的检测.

主要方法:

  • 一种混合方法,结合了改进的皮质菌优化算法 (ICFO),连续变化模式分解 (SVMD) 和波形值.
  • 通过使用增强的初始化和突变策略,ICFO通过自适应优化SVMD参数.
  • 信号分解,使用皮尔森相关性进行组件分类,以及用于重建的自适应波纹值.

主要成果:

  • 拟议的方法显著改善了信号与噪声比 (SNR) 并减少了各种噪声级别的根平均平方误差 (RMSE).
  • 在模拟中,与VMD,SVMD,VMD-WTD,CFO-SVMD和WTD相比,实现了更高的性能.
  • 在真实世界的轴承和变速箱数据上证明了有效性,保留了低剩余方差的故障频率.

结论:

  • 联合无声化方法为分析旋转机械中的噪音振动信号提供了强大的解决方案.
  • 它有效地抑制噪音,同时保留必要的故障信息,用于准确的诊断.
  • 这种技术提高了早期故障检测和预测性维护的潜力.