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设计了一套用于WSM多功能逆变焊机的程序控制电路,分析了电路组成和工作原理.采用集成电路和模拟控制电路进行程序控制.实践表明该程控电路具有使用可靠、控制精度高、抗干扰能力强等优点. 相似文献
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将模糊控制与专家控制相结合,提出了一种模糊专家控制策略,用于工业加热炉燃烧过程的温度控制.在温度偏差较小时使用模糊控制,保证较好的控制精度;在温度偏差较大时采用专家控制,保证快速的升温和降温效果.实际应用表明,这种控制策略具有响应快、鲁棒性强的特点,达到了较好的控制性能. 相似文献
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舰炮随动系统的快速性,稳定性和控制精度是影响舰炮武器系统作战性能的重要因素。针对舰炮随动系统参数时变性和负载干扰大对其快速性,稳定性和准确性的影响,设计了一种神经网络直接模型参考自适应控制器,建立了该控制器的仿真模型,并以某型舰炮为例进行了计算机仿真。结果表明该复合控制器调节时间短、控制精度高、鲁棒性强。该类控制器能够在舰炮随动控制中获得良好的控制性能。 相似文献
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自主式水下航行器具有非线性、时变性、耦合性强且易受干扰等特点,为进一步提高AUV的深度控制效果,建立六自由度空间运动模型和执行机构响应模型,将线性自抗扰控制方法引入航行器深度控制,使用基于正切Sigmoid函数的跟踪微分器优化了线性自抗扰控制方法。将上述方法应用于深度控制实验中,并从控制精度和操舵能耗两方面评价其控制效果。仿真结果表明,在无干扰条件下,与S面控制方法相比,改进后的线性自抗扰方法在具有较高控制精度的同时平均操舵能耗指标下降了55.9%,且在内外扰动作用下保持了较高的控制精度和较少的操舵能耗,体现了较好的鲁棒性和节能特性。 相似文献
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设计了一套用于WSM多功能逆变焊机的程序控制电路,分析了电路组成和工作原理。采用集成电路和模拟控制电路进行程序控制。实践表明:该程控电路具有使用可靠、控制精度高、抗干扰能力强等优点。 相似文献
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介绍了我国港口资源的整合现状,指出港口整合可以提升港口的形象和地位,也为区域经济和城市的发展注入强大的动力。最后指出在港口资源整合中要避免的几个问题。 相似文献
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广州集装箱码头的轮胎式场桥小车制动器使用10多年后,出现了许多问题,故进行了改造.分析了轮胎式集装箱龙门起重机小车制动器的主要故障现象,提出了改造方案,并加以实施. 相似文献
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本文对现有的选定球面轴承的三种工程方法进行了分析比较.引入了“合力系数”,并给出了合力方向上投影面积的精确解. 相似文献
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分析柴油机故障中常见的机体裂纹故障原因,认为由于设计缺陷和管理及操作不当,易造成船舶柴油机缸体上的裂纹多发生在气缸套凸肩处。如不及时处理这些裂纹和故障,就会造成缸套的裂纹直至出现缸套漏水等严重后果,针对NANTAIQUEEN轮柴油机对该类型故障的检修提出具体措施。 相似文献
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The hydrophysical and hydrochemical structure of the Sea of Azov, with developed bottom anoxia, was studied during the RV “Akvanavt” cruise from July 31 to August 03, 2001. The anoxic zone with a thickness from 0.5 to 4 m above the bottom was found in all deep regions of the Sea. Concentrations of hydrochemical parameters were similar to the pronounced anoxic conditions (about 90 mmol m− 3 of hydrogen sulfide, 17 mmol m− 3 of ammonia, 6 mmol m− 3 of phosphate, 7 mmol m− 3 of total manganese). The hydrophysical structure was characterized by the uniform distribution of temperature in the upper 6–7 m mixed layer (UML). Below this a thin (0.4–0.8 m) thermocline layer was observed, just above the anoxic waters. Formation of this phenomenon was connected with that summer weather conditions. Intensive rains led to increased influx of river waters in June. That resulted in large input of allochtonous organic matter (OM) and inorganic nutrients; the latter were consumed on the additional autochthonous organic matter production. In July the weather was characterized by a significant rise in the daily averaged air temperature and large oscillations of temperature during the day. In this period a wind of constant direction was absent, but wind bursts were observed. The completed analyses showed that the formation of such a structure could be connected with the following factors: (i) positive growth trends of the daily averaged temperature and the daily oscillations of temperature, (ii) presence of wind bursts. The joint action of these factors resulted in the formation of the UML. The amplitude of wind bursts determined the depth of UML, and the value of trend determined the value of the temperature change in the thermocline. An initial presence of bottom halocline (caused by the Black Sea water influx to the bottom of the Sea of Azov) prevented the heating of the bottom layer and therefore led to an increase of vertical gradient of temperature in the thermocline. The spatial distribution of the turbulent exchange coefficient confirmed the existence of a “stagnation” area located above the anoxia zone, which is also, apparently, the reason for its occurrence. 相似文献
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