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电涡流传感器检测磁悬浮转子轴向位移的方法 总被引:1,自引:1,他引:1
磁悬浮转子的轴向位移常常利用电涡流传感器从转子轴向方向来检测,这一方法具有一定局限性。针对这一情况,在分析了电涡流传感器的工作原理以及输出特性的影响因素后,研究了利用被测导体的台阶表面来检测导体沿传感器径向方向的位移的方法。在该方法中,采用与差动相反的思想,将关于被测导体对称布置的两个传感器的输出进行加和,来消除传感器线圈与导体间距离的变化对检测结果的影响。结合磁悬浮转子的特性,提出了磁悬浮转子轴向位移径向检测的方法,并进行了实验验证,结果表明传感器的输出电压之和与转子轴向位移之间具有良好的线性关系和灵敏度,验证了该方法的正确性和可行性。 相似文献
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由于磁轴承的动态性能主要取决于所采用的控制规律,控制器是磁轴承系统的关键.在数字复合正交神经网络(NN)的基础上,提出了一种模拟复合正交神经网络,并用于轴向磁轴承的控制中.控制器采用模拟复合正交神经网络与PID的并行控制方法,对带有负载干扰的轴向磁轴承控制系统作了PID控制与NN PID控制的仿真实验.仿真结果表明,相对于常规PID控制器,该并行控制法具有较高的抗干扰与自适应能力-控制效果理想. 相似文献
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轴向游隙测量仪上原先固定轴承外圈的下外垫块是使用螺纹连接方式固定在底座上的,其加工精度直接影响游隙的测值。为了避免以上情况的发生,将下外垫块与底座的连接处改进为球面接触后,增加了调心性,使被测轴承外圈能更好地被夹紧,保证了轴向游隙测值的准确性。 相似文献
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针对现有油井示功图传感系统不能适应低冲次油井、位移精度低等问题,设计了基于位置感知和位移复用的高精度示功图传感系统。通过对大量真实示功图数据进行分析,得出了在不改变油井冲程的情况下位移轨迹一致的结论,提出了利用位置感知和位移复用实现高精度示功图采集的方案,详细介绍了该传感系统的硬件组成和关键软件算法。通过对该传感系统在油田现场采集的真实数据进行分析,结果表明,该传感系统工作稳定可靠,能够适应的最低冲次达到0.2次/min,冲程及位移误差小于1%。与其他类型示功图传感系统相比具有明显的优势,完全满足油田生产对示功图采集系统适用范围和精度的要求。 相似文献
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针对悬臂式轴承试验机,提出一种工艺装备的设计方案,重点解决圆柱滚子轴承外圈的轴向定位问题,以保证轴承试验的各种技术参数的高度模拟状态。 相似文献
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针对低功耗和非接触式位移测量的应用需求,利用磁阻传感器,本文在传统的线性测量方法的基础上,提出了一种非线性的测量方法。设计了一个测量系统,实测结果表明该方法测量精度高、测量范围广、简单易用,也节省了成本。 相似文献
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在双列圆锥滚予轴承的生产过程中,通过对隔离圈配磨方法的改进,使产品游隙的精确性和生产效率均得到明显提高。 相似文献
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双列圆锥滚子轴承轴向游隙用间隔圈的厚度尺寸的计算方法复杂,费时费力。针对这一问题,设计和制造了轴向游隙测量辅具来确定中隔圈厚度尺寸与修磨量,保证了轴向游隙精度。 相似文献
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该文提出通过高精度电涡流传感器来采集轴承表面位移信号,并使用近似熵指标对信号进行分析,最终实现滚动轴承动态质量的评估。实验结果表明,所提出的方法能够清晰地鉴别轴承损伤位置及缺陷类型,为实际生产提供了参考和依据。 相似文献
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简要分析了径向进气、轴向排气型煤气透平膨胀机的排气侧轴承温度增高的原因,如何避免煤气透平膨胀机排气侧支撑轴承温度的升高,对保证TRT机组的正常运行非常重要。通过该文提出的控制透平排气侧轴承温度升高的方法,使TRT机组自动化系统的控制功能更加完善。 相似文献
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In this study, the lubrication characteristics of a slipper bearing for axial piston pump considering oil thermal effect have been investigated. A mathematical model is developed to predict the film thickness and temperature on the slipper/swash plate interface under different operating conditions. Based on the mathematical model, a parametric study is conducted to evaluate the slipper lubrication performance. It is found that the slipper is characterised by an unstable behaviour and the behaviour is enhanced by lower pressure and higher rotational speed. As the film temperature increases rapidly due to high shaft speed and piston chamber pressure, the overall result is a rather low decline in the film thickness. The leakage flow rate increases with increasing speed or oil film thickness. The structure parameter can be optimised to obtain satisfactory slipper performance. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Tsuyoshi Ohsumi Ken Ikeuchi Hirofumi Takase Haruki Obara Yoshio Haruyama Nobuyasu Yokoi 《Tribology International》1994,27(4)
There has been much research into improving the characteristics of an externally pressurized thrust bearing and this has used two methods: a flow control device and sensing mechanisms. This report uses the latter method and deals with an externally pressurized thrust gas bearing which has a variable flow control device controlled by two signals. One source of signal is shaft displacement and the other is load variation. The results predict that a bearing controlled by load variation has a much higher performance than that controlled by shaft displacement. In the experiment a bearing which feeds back load variation showed a high performance for shaft displacement over a wide range of frequencies. 相似文献
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基于反馈线性化和保性能控制的轴向磁轴承单侧线圈故障容错控制 总被引:1,自引:0,他引:1
针对轴向永磁偏置磁轴承一侧线圈无电流时磁轴承承载能力下降且非线性增强的情况,提出一种反馈线性化与保性能控制相结合的组合容错控制策略来提高轴向磁轴承在故障情况下的承载能力并使其能在承重时稳定悬浮转子。首先,建立了故障情况下后轴向磁轴承-转子系统的非线性动力学模型,通过反馈线性化方法使系统大范围线性化。然后,在考虑参数摄动的基础上设计最优保性能控制器使转子稳定悬浮。最后,在轴向一侧线圈无电流的永磁偏置磁悬浮转子上进行了多项实验。实验结果表明,所设计的组合容错控制器实现了承重情况下转子的稳定悬浮,摄动最大的参数变化约35%时位移跳动量峰值为2.6μm,超调量小于3%,调节时间为82ms。结果验证了该方法不仅能实现容错控制,而且具有良好的动静态性能及鲁棒性。 相似文献
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Parametric experiments were conducted to analyse the influence of some supply conditions on the performance of a steadily loaded journal bearing. The temperature distribution on the internal surface, the flow rate, and the bearing eccentricity were measured for different sets of operating conditions, under variable supply conditions. Quantitative information was provided which showed the effect of both shaft speed and applied load on maximum bush temperature and flow rate. It was observed that flow rate was moderately affected by load and significantly affected by rotational speed, oil supply temperature, and supply pressure. The maximum bush temperature was moderately affected by supply pressure and load, and significantly affected by shaft speed. For low applied loads, the attitude angle was markedly affected by supply pressure. The experimental results also showed that for a small groove length there was a variation in bush temperature in the axial direction in the groove region. 相似文献