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针对传统示功仪采用拉线法测量位移不易维护和采用加速度传感器测量位移精度不高的问题,设计了一种基于高精度传感器的算法,从底层数据采集和数据处理方法出发,结合硬件,选用新式的自适应采集模式,根据油井运行的特征,采用积分求位移的算法,实际测试结果表明,算法精度很高,同时通用性更强. 相似文献
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在抽油机示功图的基础上,通过坐标变换方法,把位移坐标变成时间坐标,这样示功图变成了载荷-时间坐标图的形式,通过分析载荷随时间变化情况以及比较实际载荷和理论载荷,从而分析判断抽油机的工作状况:并且对抽油机的卡具和抽空两种典型故障诊断模型作了分析,给出适用于嵌入式应用的抽油机故障诊断方法,为嵌入式微机抽油机故障智能诊断系统的软件设计提供了依据。 相似文献
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针对某车载武器振动位移测试中存在的严重趋势项干扰问题,提出了基于经验模态分解(Empirical Mode Decomposition,EMD)的信号处理方法.为有效提取趋势项,提出了一种新的趋势项判定方法.该方法根据振动信号相对时间轴对称的特点,通过比较各IMF分量与原始信号的均值判定该阶IMF分量是否为趋势项.模拟振动信号仿真证明了方法的有效性.最后对实测信号进行了EMD处理并最终重构了振动位移信号,与小波变换方法及一种定性的EMD趋势项判定方法进行了比较,结果表明提出的基于EMD的信号趋势项提取和判定方法有更大的优越性,有助于客观评价该武器性能. 相似文献
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本课题是针对油田边远井、孤立井能够更方便的进行故障诊断,创新的采用手持终端与自组织竞争神经网络相结合的方法进行油井故障诊断。以抽油机作为研究对象,从油井的示功图入手,利用自组织竞争神经网络对抽油井示功图进行智能识别分类,实现油井故障的自动诊断。实验表明,基于神经网络的故障诊断系统在手持android终端能够成功实现,并且诊断正确率在97.3%以上。 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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The approaches to prepare a uniform and unified scientific terminology of chemical carcinogenesis are presented. The main definitions proposed (carcinogen, initiation, promotion, mutagen, multistage carcinogenesis, anti-carcinogen, cocarcinogen, carcinogenic risk, etc.) are based on the current state of comprehending mechanisms of the action of chemical carcinogens. 相似文献
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近红外光谱技术在水果品质无损检测中应用的研究与现状 总被引:6,自引:0,他引:6
简单概述了我国水果产业的发展现状,着重阐述了国内外利用近红外光谱技术进行水果品质无损检测的最新研究进展,分析了当今研究中存在的问题,并对利用近红外光谱技术进行水果检测的前景进行了展望,提出了一些建议。 相似文献