高含水率疏浚淤泥排水板滤膜淤堵机理

真空预压加固高含水率疏浚淤泥通常存在排水板滤膜的淤堵问题。通过开展4种排水板滤膜的物理力学性能测试,以及环境扫描电子显微镜观测滤膜的孔洞结构规则,对比分析滤膜淤堵试验中梯度比大小规律的本质因素。总结提出滤膜的淤堵机理,并建立防淤堵准则。     

Global Inverse Optimal Tracking Control of Underactuated Omni-directional Intelligent Navigators (ODINs)

This paper presents a design of optimal controllers with respect to a meaningful cost function to force an underactuated omni-directional intelligent navigator (ODIN) under unknown constant environment...     

欠驱动船舶水面的非线性数学模型及跟踪控制

以欠驱动船舶水面的跟踪控制为研究对象,介绍船舶的数学模型和运动方程建模,以及船舶在水平面上3个自由度的运动方程,并且对船舶可能受到的风、浪、流等干扰进行分析。最后,提出一种自抗扰船舶航向控制方法,在该方法中,运用遗传算法对控制参数进行优化处理。实验结果表明,该自抗扰控制方法具有较高的抗干扰能力和较强的鲁棒性。     

基于BP神经网络的图像识别跟踪技术

本文利用BP神经网络抗干扰性强,识别精准等优点对船舶进行识别跟踪。首先获取原始图像,然后预处理,以图像的全部灰度值为训练样本,以新不变矩特征向量为样本集输入到3层BP神经网络中,对含不同噪声均值的图像进行识别。实验结果表明,以新不变矩特征向量作为样本集时抗噪能力强,识别率高。最后以新不变矩特征向量作为样本集进行目标跟踪得到跟踪误差。     

干扰及参数扰动条件下的航迹镇定滑模控制

以欠驱动船舶船迹控制应用为背景,提出一种在外界干扰和参数扰动条件下的船舶镇定滑模控制算法。为有效抑制常规滑模控制器的抖振,提高在受到外部环境干扰和参数摄动时的鲁棒性,提出基于BP神经网络的非线性自抗扰滑模控制算法。仿真结果表明,该方法能够有效应对风流干扰,具有很好的鲁棒性。     

降低京台高速泰安济宁段养护成本的措施探讨

通过加强全面预算管理和对养护工程实施全过程跟踪审计,降低养护成本,促进建设单位合理利用资金,实现效益最大化.     

Improving the physics of a coupled physical–biogeochemical model of the North Atlantic through data assimilation: Impact on the ecosystem

Several studies on coupled physical–biogeochemical models have shown that major deficiencies in the biogeochemical fields arise from the deficiencies in the physical flow fields. This paper examines the improvement of the physics through data assimilation, and the subsequent impact on the ecosystem response in a coupled model of the North Atlantic. Sea surface temperature and sea surface height data are assimilated with a sequential method based on the SEEK filter adapted to the coupling needs. The model domain covers the Atlantic from 20°S to 70°N at eddy-permitting resolution. The biogeochemical model is a NPZD-DOM model based on the P3ZD formulation. The results of an annual assimilated simulation are compared with an annual free simulation.With assimilation, the representation of the mixed layer depth is significantly improved in mid latitudes, even though the mixed layer depth is generally overestimated compared to the observations. The representation of the mean and variance of the currents is also significantly improved.The nutrient input in the euphotic zone is used to assess the data assimilation impact on the ecosystem. Data assimilation results in a 50% reduction of the input due to vertical mixing in mid-latitudes, and in a four- to six-fold increase of the advective fluxes in mid-latitudes and subtropics. Averaged zonally, the net impact is a threefold increase for the subtropical gyre, and a moderate (20–30%) decrease at mid and high latitudes.Surface chlorophyll concentration increases along the subtropical gyre borders, but little changes are detected at mid and high latitudes. An increase of the primary production appears along the Gulf Stream path, but it represents only 12% on average for mid and high latitudes. In the subtropical gyre centre, primary production is augmented but stays underestimated (20% of observations). These experiments show the benefits of physical data assimilation in coupled physical–biogeochemical applications.     

灰箱辨识在二系悬挂参数估计中的应用

介绍了灰箱辨识在铁道车辆二系悬挂参数估计中的应用,运用灰箱辨识方法估计二系悬挂的质量、阻尼和刚度参数,并比较了两种灰箱辨识软件工具MoCaVa和CTSM的辨识结果。分析辨识结果发现MoCaVa在测量噪声存在时比较精确的估计出线性模型的结构参数,且辨识结果对参数初值具有鲁棒性。该方法对监测车辆的运行状态,诊断车辆故障具有重要意义。     

分布式水下多传感器多目标模糊跟踪融合方法

水下多传感器多目标跟踪系统往往是一个不同类传感器融合系统,且其目标航迹包含有不确定和模糊信息.本文首先利用模糊隶属度函数和模糊逻辑推理技术,进行分布式水下多传感器多目标航迹模糊融合关联决策,并利用有效数据处理和分层融合估计相结合的方法,以实现不同类传感器高精度融合跟踪估计.     

双块式无碴轨道工具轨法施工装备之粗调机

RP1500—4型粗调机是针对武广客专研制开发的双块式无碴轨道施工装备。介绍了该粗调机的主要结构、系统构成、性能参数及其应用范围。该粗调机在武广客专试验段应用，取得了满意的效果。