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舰船磁场可视化技术的研究与实现 总被引:1,自引:0,他引:1
为了提高舰船的磁性防护能力,必须对舰船进行消磁处理。利用可视化技术对舰船磁场进行形象化描述,并对舰船消磁效果进行即时、有效地分析与评价,是提高舰船消磁效果的有效途径。该文在微机上用Visual C 语言实现了舰船磁场可视化系统,系统具有可扩充性及友好的人机界面。 相似文献
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针对现有单舰船组合导航定位技术存在的不足,如过度依赖GPS、差的可靠性和容错性以及缺乏网络系统概念等,将无线网络系统概念引入到舰船组合导航中,从而基于海上智能交通系统(MITS)提出一种新颖的网络舰船相对组合导航定位方法。该方法不再将海上舰船视为MITS中的孤立节点,因此目标舰船可使用来自网络内其它舰船节点的导航估计并采用最优分布式加权融合来改善自身的组合导航定位估计性能。与现有的单舰船组合导航方法相比,新方法具有更好的导航估训‘精度、更好的稳定性和容错性。 相似文献
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目的 在光学遥感图像中,针对舷靠舰船灰度和纹理特征与港口相近,传统方法检测效果不理想的问题,提出一种基于局部显著特征的舷靠舰船检测方法。方法 首先,对原始图像预处理得到海陆分割后的二值图像;然后,提取二值图像中的直线段作为局部显著特征检测舰船目标;再将直线段提取结果与舰首检测相结合,建立舷靠舰船检测模型;最后,通过计算舰船几何尺寸及环境信息分析确定舰船目标。结果 在两幅不同场景的光学遥感图像中验证本文方法并与其他算法进行对比,本文方法识别率可达100%,且不存在误检和漏检情况,相比于其他算法具有一定优势。在舰船背景复杂或停泊朝向不定时,文中方法可有效判别舰船停靠方向并对舰船目标进行正确标记。结论 在复杂背景环境及其他干扰下,应用本文方法检测舷靠舰船目标准确率高,鲁棒性强,具有较高适应性。 相似文献
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宿勇 《计算机与数字工程》2015,(7)
针对海战场图像信息的目标检测与识别问题,论文提出一种基于 D‐S(Dempster‐Shafer)的海上舰船图像目标多特征信息融合识别方法。该方法包括三个主要内容:1)建立以舰船目标的几何特征为证据源的 D‐S 融合识别模型,这些特征计算简单,容易获取,且在舰船目标识别时具有良好的区分性;2)针对不同舰船特征,获取每个特征的基本信度赋值;3)根据舰船目标识别模型的特点,分析不同的比例冲突分配规则对舰船目标识别的鲁棒性,采用适于舰船目标识别的比例冲突分配规则。实验结果表明在舰船目标的识别中,该方法具有较高的识别精度。 相似文献
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研究舰船装备备件准确评估问题,由于舰船装备备件受到使用方式、使用环境、使用者、储存条件等多个因素的影响,实际消耗数据具有不确定性,传统的方法并不适用于全部的舰船装备备件配置需求量的计算.在分析了舰船装备的需求规律和使用可靠性信息的基础上,建立了失效数的统计模型,将备件失效率分为工作失效率和非工作失效率,提出了备件实际消耗数据的失效率的Bayes评估方法,充分利用了装备的各类可靠性历史信息和专家经验信息,更适用于装备批量小或工作时见短的舰船装备.给出了舰船装备在满足一定保障度下的备件配置需求量的确定方法.经验证实例说明方法是可行的. 相似文献
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分析了时滞反馈力作用下含有分数阶阻尼的随机系统,并讨论了该系统的稳态响应及随机分叉.首先,通过对含有时滞项的近似处理以及基于广义谐和函数的随机平均法得到了该系统的稳态响应.然后使用算例对方法的有效性进行了验证,其中主要研究了时滞反馈作用力和分数阶阻尼对系统稳态响应的影响,结果表明上述两者的变化会影响系统的稳态响应并引发随机分叉现象. 相似文献
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The aim of this paper is to present a methodology that provides an analytical tool for estimation of robustness and response
variation within a pre-defined process window. To exemplify the developed methodology, the stochastic simulation technique
is used for a sheet-metal forming application. A sampling plan based on the Latin hypercube sampling method for variation
of design parameters is utilized, and the thickness reduction is specified as the response. Moreover, the response surface
methodology is applied for understanding the quantitative relationship between design parameters and response value. The conclusions
of this study are that the applied method gives a possibility to illustrate and interpret the variation of the response versus
a design parameter variation. Consequently, it gives significant insights into the usefulness of individual design parameters.
It has been shown that the method enables us to estimate the admissible design parameter variations and to predict the actual
safe margin for given process parameters. Furthermore, the dominating design parameters can be predicated using sensitivity
analysis, and this in its turn clarifies how the reliability criteria are met. Finally, the developed software can be used
as an additional module for set-up of stochastic finite element simulations and to collect the numerical results from different
solvers within different applications. 相似文献
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详细介绍了基于同一场景不同曝光量图像序列的高动态范围图像合成过程;针对现有拟合的相机响应曲线随采样点的变化曲线变化大、不稳定等特点,提出一种新的相机响应曲线算法.该算法先根据图像序列成像特点对图像序列去噪;采用最小二乘法拟合出图像序列像素值关系曲线;利用该曲线再一次采用最小二乘法拟合得到相机响应曲线.实验结果表明,该技术拟合出的相机响应曲线比较平滑,能合成出高质量的高动态范围图像. 相似文献
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D. L. Yu 《Neural Processing Letters》2004,20(2):125-135
In this paper a localized forgetting method is proposed for on-line adaptation of Gaussian radial basis function network models. It is realised that the commonly used exponential forgetting applies to the past data from the entire operating space uniformly and therefore, is not correct for nonlinear systems where dynamics are different in different operating regions. The new method proposed in this paper sets different forgetting factors in different regions according to the response of the local centre to the current measurement data. The method is applied in conjunction with the recursive orthogonal Least Squares algorithm and the computing is consequently very efficient. The developed method is applied to modelling of dissolved oxygen in a chemical reactor rig. It shows a smaller mean squared error for one-step-ahead prediction than using the uniform forgetting. 相似文献
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Y. Matriche M. Feliachi A. Zaoui M. Abdellah 《International journal of remote sensing》2013,34(21):7499-7518
We discuss the identification and localization of a buried object using B-scan response of a ground penetration radar (GPR). We use the Finite Difference Time Domain (FDTD) and an Improved Particle Swarm Optimization (IPSO) methods association as an inverse problem. The A-scan response of the soil without the presence of any object is used in this inverse problem to estimate the physical characteristics of this soil. Then, we included these parameters into the inverse problem to characterize a cylindrical buried object from its GPR B-scan response. This response is simulated using the FDTD method. Several simulated cases of cylindrical object were tested with different radius, electrical conductivity, and depth. The proposed method allowed us to locate and identify buried objects (plastic and metal) at different depths. 相似文献
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A direct synthesis tuning method is proposed for the PI controller settings of unstable first-order-plus-time-delay processes. Unlike hitherto-known PI setting rules which often result in overshoots in time response or require the modification of the feedback control structure, this method ensures the overdamped response as desired while retaining the conventional PI control structure. This enhanced performance is possible by introducing a first-order set-point filter and applying simple rules for setting the values of the controller parameters without having any tuning parameters. The comparison with both conventional PI controllers and two-stage IMC method reveals that the proposed method produces not only smooth overdamped closed-loop response for set-point changes, but also fast regulatory control response for load changes. These responses are also shown to be quite robust against the uncertainties of the parameters as well as against the noise in the signal. The stability conditions for the processes having a large time delay or different ratios of time delay/time constant have been investigated as well. © 相似文献
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