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排序方式: 共有129条查询结果,搜索用时 15 毫秒
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对近年来国内外虚拟企业伙伴选择模型与方法的研究进展作了综述。首先,对伙伴选择的研究进行了分类;然后,分别介绍了个体决策情况下的关于单任务与多任务的伙伴选择研究现状以及群决策情况下的伙伴选择研究现状;最后,对今后的主要研究工作进行了展望. 相似文献
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柔性空间机械臂末端运动及柔性振动的模糊自适应补偿控制 总被引:4,自引:0,他引:4
讨论了载体位置不受控、姿态受控情况下,具有不确定参数的漂浮基柔性空间机械臂系统载体姿态与末端爪手惯性空间轨迹跟踪的模糊自适应补偿控制和柔性振动优化控制问题.利用拉格朗日方程和假设模态法并结合系统动量守恒关系,分析、建立了柔性空间机械臂系统的动力学方程及运动Jacobi关系.以此为基础,使用奇异摄动法和2种时间尺度的假设... 相似文献
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《Journal of the European Ceramic Society》2023,43(15):7196-7204
Additive manufacturing of SiC-Sialon refractory with complex geometries was achieved using direct ink writing processes, followed by pressureless sintering under nitrogen. The effects of particle size of SiC powders, solid content of slurries and additives on the rheology, thixotropy and viscoelasticity of ceramic slurries were investigated. The optimal slurry with a high solid content was composed of 81 wt% SiC (3.5 µm+0.65 µm), Al2O3 and SiO2 powders, 0.2 wt% dispersant, and 2.8 wt% binder. Furthermore, the accuracy of the structure of specimens was improved via adjustment of the printing parameters, including nozzle size, extrusion pressure, and layer height. The density and flexural strength of the printed SiC-Sialon refractory sintered at 1600 °C were 2.43 g/cm3 and 85 MPa, respectively. In addition, the printed SiC-Sialon crucible demonstrated excellent corrosion resistance to iron slag. Compared to the printed crucible bottom, the crucible side wall was minimally affected by molten slag. 相似文献
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立体视觉中的图像立体匹配方法 总被引:1,自引:0,他引:1
图像立体匹配是立体视觉的核心技术,在三维重建、视觉测量及目标识别等领域中得到了广泛的研究和应用.根据立体匹配技术特点,图像立体匹配可分为三大类:局部立体匹配、全局立体匹配和半全局立体匹配.着重介绍了前两大类中典型的图像立体匹配方法.对各种图像立体匹配方法的匹配算法进行了分析研究,并对图像立体匹配方法的发展提出了一些建议. 相似文献
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甲酸盐三价铬电镀工艺的研究 总被引:1,自引:1,他引:0
目的解决现有氯化盐体系和硫酸盐体系三价铬电镀存在的问题。方法以甲酸铬为主盐,甲酸铵、尿素和苹果酸为络合剂,通过Hull槽试验和方槽试验,研究铬离子、甲酸铵、尿素、苹果酸的浓度以及镀液pH值、镀液温度、电镀时间等工艺参数对黄铜表面三价铬镀层形貌、沉积速率和光亮范围的影响。结果甲酸铵和尿素分别与Cr3+形成活性络合物,苹果酸具有pH值的缓冲作用。最佳的工艺条件为:Cr3+浓度0.4 mol/L,甲酸铵浓度0.5 mol/L,尿素浓度0.2 mol/L,苹果酸浓度0.05 mol/L,镀液pH值3.5,镀液温度25~30℃。结论该甲酸盐三价铬电镀工艺具有较宽的光亮范围,镀层孔隙率低,光亮致密,沉积速率较高,与铜基体结合良好,结构为混晶态。在室温、电流密度为15 A/dm2的条件下电镀5min,镀铬层厚度即可达到1.78μm,满足装饰性镀铬层的要求。 相似文献
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《International Journal of Hydrogen Energy》2023,48(50):19196-19206
As one of the most promising sustainable energy technologies available today, proton exchange membrane fuel cell (PEMFC) engines are becoming more and more popular in various applications, especially in transportation vehicles. However, the complexity and the severity of the vehicle operating conditions present challenges to control the temperature distribution in single cells and stack, which is an important factor influencing the performance and durability of PEMFC engines. It has been found that regulating the input and output coolant water temperature can improve the temperature distribution. Therefore, the control objective in this paper is regulating the input and output temperature of coolant water at the same time. Firstly, a coupled model of the thermal management system is established based on the physical structure of PEMFC engines. Then, in order to realize the simultaneous control of the inlet and outlet cooling water temperature of the PEMFC stack, a decoupling controller is proposed and its closed-loop stability is proved. Finally, based on the actual PEMFC engine platform, the effectiveness, accuracy and reliability of the proposed decoupling controller are tested. The experimental results show that with the proposed decoupling controller, the inlet and outlet temperatures of the PEMFC stack cooling water can be accurately controlled on-line. The temperature error range is less than 0.2 °C even under the dynamic current load conditions. 相似文献
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