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对液压系统的常见故障及常用监测方法进行了分析,提出将静电传感器技术运用到液压系统在线监测中;研究了液压系统油液在线监测机理、磨粒荷电量的影响因素;设计了一套适用于液压系统的油液在线监测系统;研究了磨粒浓度、大小及材质与传感器测量电压之间的关系.运用静电传感器在线监测液压系统工作介质中磨损颗粒的荷电情况,得到液压系统磨损的监测结果,验证了静电监测方法在液压系统在线监测中的有效性与可行性. 相似文献
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《仪表技术与传感器》2015,(8)
为预防电气设备异常升温而导致的电力故障等问题,设计一种以无线传感器网络(WSN)为核心,传感器技术为基础的温度在线监测系统。系统由6个传感器节点和1个数据汇总单元组成,传感器节点负责温度测量并通过无线传感器网络将温度信息发送给数据汇总单元;数据汇总单元会在每天的规定时间将各个传感器节点测量数据无线传送给巡检员并在系统供电电压不足或者设备异常升温时发出报警短信。测试实验结果表明:无线传感器网络有效通讯距离远,系统功耗低,测量数据准确可靠,适合于电力系统的温度在线监测。 相似文献
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本文提出一种加工误差分析的系统。该系统由传感器、A/D转换器和微型计算机组成。被测误差由传感器检测并转换成电压信号,再由A/D转换器进行数据采集,传入微机,微机对测量数据进行处理,得出加工误差分析所需的误差理论分布曲线等有用信息,从而使测量分析结果更准确,更迅速,为在线分析提供了可能。 相似文献
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《仪器仪表学报》2020,(6)
由于硅压阻式压力传感器的测量精度易受温漂和非线性等因素影响,而现有测量误差数字补偿方法实时性不高,因此提出了一种基于二元插值算法的异频分步在线补偿方法。首先采用三次样条插值算法对传感器输出电压和工作温度插值,抑制温漂;然后利用拉格朗日插值算法对压力和电压进行分段插值,减小非线性误差;同时降低温度的插值频率以减少每个压力插值周期内计算量,克服了传统的插值补偿方法将两个变量在一个插值周期内计算时间长的缺点。通过传感器标定和误差补偿实验验证了该方法的补偿精度在0~60℃的温度范围内满足±0.05%FS的误差要求,并且在设计的采集系统上实现1 kHz的数据输出速率。实验结果表明该方法可以有效地提高硅压阻式压力传感器的测量精度,且具有较高的实时性,能够实现误差在线补偿。在航空发动机试验的气体压力测量中具有一定的工程应用价值。 相似文献
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本文介绍一种采用气动位移传感器及电涡流位移传感器组成复合位移传感器进行纸张厚度在线非接触测量技术。并介绍了实际样机的研制情况,分析了实测结果及误差因素。该系统测纸张厚度不受其水分、密度的影响,具有较高的测量精度。为非金属薄质材料的在线非接触测量提供了新的手段。 相似文献
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为解决以往机械甘蔗种植时蔗种、基肥分发成堆不均匀问题,通过利用压力传感器对蔗种分发与基肥发信息采集、用4个超声波传感器对地头地尾及行距数据采集、用左右轮速度传感器对种植速度数据采集和电流传感器对种植机驱动电机电流进数据采集,分别经LA3220放大器放大后,送入MSC1210Y5单片机进行数据处理,分别控制蔗种和基肥输出门的开启大小、种植机转弯与前进方向和种植速度,达到蔗种、基肥均匀发放。通过SR-232接口电路、GR47无线传输模块、GPRS无线网络和PC机等进行甘蔗种植远程监控,实现了无人电动甘蔗种植。 相似文献
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Bong-Cheol Shin Seok-Jae Ha Myeong-Woo Cho Tae-Il Seo Gil-Sang Yoon Young-Moo Heo 《Journal of Mechanical Science and Technology》2010,24(1):165-168
In this study, a useful indirect cutting force measurement method using an acceleration sensor and current hall sensors is
proposed. A series of experiments was performed on a precise micro machining stage with a high-speed spindle. A three-axis
acceleration sensor was installed on the spindle head, and current hall sensors were connected to the motor current inlet
cables. From the results obtained, the correlations of the tool teeth rotation and current amplitude showed a linearity of
92.0% precision for hall sensor signals, and 98.0% precision for acceleration sensor signals. Even though the results using
the acceleration sensor showed better linearity than those of the current hall sensors, the signals can be easily affected
by chattering, spindle vibration, and other external disturbances. From this perspective, the current hall sensor can provide
more robust results. 相似文献
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《Measurement》2016
In recent years, micro-electromechanical systems (MEMS)-based sensors have shown huge attraction in machinery fault diagnosis due to their low power consumption, low cost, small size, mobility, and flexibility. Hence, this paper presents a comprehensive fault diagnosis scheme using MEMS-based accelerometers and current sensors to identify several induction motor failures. In this paper, we first verify the reliability of these MEMS-based sensors via frequency analysis for vibration and current signals captured by them. Likewise, this paper validates their suitability for machinery fault diagnosis. To do this, we configure a 147-dimensional feature vector using statistical values (i.e., 21 statistical values × 7 MEMS-based accelerometers and current sensors), analyze fault signatures by employing a kernel principal component analysis, and pinpoint types of induction motor failures with one-against-all multi-class support vector machines (OAA MCSVMs), a random forest (RF), and a fuzzy k-nearest neighbor (Fk-NN). Experimental results indicate that the presented fault diagnosis approach using MEMS-based accelerometers and current sensors yields 100%, 86%, and 80% of classification accuracy with OAA MCSVMs, the RF, and the Fk-NN, respectively. Accordingly, MEMS-based sensors are enough for substituting commercial accelerometers and current sensors that are used for fault diagnosis. Specifically, MEMS-based accelerometers are far more effective for preserving intrinsic information about various induction motor failures than MEMS-based current sensors, offering at least 38% performance improvement in classification accuracy. 相似文献
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新型自动气象站结构特点及其优越性 总被引:5,自引:0,他引:5
新型自动气象站是根据当前国际先进的CAN总线技术进行设计的,可结合台站需要自由选择所需传感器,解决当前自动气象站系统无法扩展新要素的问题,其要素设计更为全面科学,对温湿度传感器也进行了改进,并增加称重雨量传感器和0.5mm翻斗雨量传感器。新型自动气象站提高了地面常规要素观测和灾害天气观测的准确度,在软件设计、硬件结构、防雷性能、处理存储能力等方面也比当前运行的自动气象站有较大提升。 相似文献
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磁悬浮轴承转子位移检测技术 总被引:1,自引:0,他引:1
在综述电涡流式、电感式、电容式、光电式等几种主要位移传感器原理、性能及其适用范围的基础上,分析使用位移传感器所带来的一系列问题,论述了磁悬浮轴承无传感器技术的基本思想,并比较了几种磁悬浮轴承无传感器检测方法的优缺点.最后,对磁悬浮轴承位移检测技术的发展趋势做了进一步阐述. 相似文献
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The use as a tested parameter of a coercimeter of the demagnetizing current that is measured at the moment of zero crossing of the magnetic flux in the magnet core by Hall sensors arranged under the electromagnet poles is shown to have an advantage over the use of the demagnetizing current measured at equal readings of Hall sensors placed in the neutral plane of the electromagnet in the leakage flux at different distances from an article. 相似文献
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A. A. Titov 《Instruments and Experimental Techniques》2002,45(2):210-212
An ultrabroadband power amplifier with automatic control of the consumption current intended for operation into an unmatched load is described. To control the amplifier consumption current and gain, voltage sensors and output-current sensors are used at the amplifier output. The amplifier passband is 20–240 MHz; gain flatness, ±1.5 dB; gain, 40 dB; maximal output power, 20 W minimum; consumption current under no-signal condition, 2.2 A; and under peak-load conditions, 6.8 A. 相似文献