fault bar
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As a result, the feature frequency components of rotor broken bar fault, hiding behind the fundamental positive sequence component, emerge in the spectrum now.
由于滤除了基波正序分量,在频谱图上,被基波正序分量掩盖的断条故障特征就显示出来了。
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To before one kind of circumstance, the subjective fault of the Internet bar is apparent; A kind of circumstance after be opposite, if the Internet bar is indemonstrable whether did its pass accredit to all arrive to examine obligation to experience case work, criterion its are subjective go up to still have fault, ever cannot assure to pass a license with provider of copyright of movie and TV and avoid duty.
对于前一种情况,网吧的主观过错是明显的;对后一种情况,网吧若不能证实其对涉案作品是否经过授权尽到了审查义务,则其主观上仍具有过错,不能以影视版权提供商曾保证经过了许可而免责。
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The broken rotor bar fault diagnosis for squirrel cage induction motor is investigated based on the international and domestic relate theory.
通过综合国内外相关理论,对笼型异步电动机几种转子断条故障诊断方法进行了研究。
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The Hilbert amplitude envelope of the stator current includes the low frequency of fault characteristic, thus it can reduce the signal length by resample the Hilbert amplitude envelope of the stator current by downsampling, which can avoid spectrum aliasing. Then it can reduce the computation time of the MUSIC Method for the spectrum analysis to the resampled signals for the given bandwidth. Meanwhile combining continuous subdivision Fourier transform and rotor slot harmonics based slip estimation it can in advance estimate the concrete values of the fault characteristic frequency, and then inquiry purposely the fault feature component information in the stator current spectrum in order to accomplish the broken rotor bar fault with high sensitivity and h reliability, which eliminates adverse effect of issuable false peaks to the fault detection and formed a novel scheme to detect broken rotor bar fault.
定子电流Hilbert幅值包络信号包含了低频的故障特征频率调制信号,故通过对定子电流Hilbert幅值包络信号进行降采样率重采样、减少分析信号长度,可避免低频段频谱混叠,再对减少的重采样数据进行具有超分辨率的MUSIC低频段估计,可大大降低MUSIC算法频谱估计时间;运用连续细化傅里叶变换和转子齿槽谐波转差率估计技术,可预知故障特征频率精确值,从而可有目的地查询故障分量,消除MUSIC虚假波峰对故障检测混淆的影响,大大提高了故障检测的灵敏度和可靠性,以此形成异步电动机转子断条故障检测新方法。
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Need to reflect on our fault bar!
好好反思我们的过错吧!
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