Experimental study on dispersion coefficient of dredger fill in reclamation region

In order to satisfy the demand of land use, reclamation engineering has been undertaken in coastal cities for a long time. To study the contaminant transport in the reclamation districts, robust and accurate estimation of dispersion coefficient is essential. In this study, the continuous sodium chloride （NaC1） solution with constant concentration was introduced into the column filled with the dredger fill to get the breakthrough curves （BTCs）. Inverse error function method （IEFM） and CXTFIT program were used for estimating dispersion coefficient. Results showed that the difference between the dispersion coefficients estimated by IEFM and CXTFIT program was slight. The main reason was that the BTC was not strictly linear. IEFM performed poorly in the nonlinear area, while the CXTFIT performed well over the entire BTCs. Moreover, the dispersion coefficient of dredger fill was small. The dispersion property of dredger fill would result in the slow migration of contaminants in the dredger fill.     

绞吸式挖泥船岸管回水的危险性及处理方法

针对CSD650型绞吸式挖泥船在疏浚吹填工程施工过程中所遇到的各种岸管回水的情况,通过在岸管起点处将管线垫高至整段管线的最高点,并在此处加装呼吸阀,以达到避免岸管回水可能给船舶带来的危险性和提高挖泥船泥泵掏石的效率.     

基于自适应反步法的干扰补偿挖泥船动力定位控制

为解决挖泥船在挖泥强反作用干扰或恶劣环境干扰下,动力定位控制系统不稳定的难题,提出采用自适应反步法来解决挖泥船的动力定位问题.由于自适应算法采用实时估计干扰值并进行前馈补偿,而不是在挖泥机构上额外加装传感器的方法,从而简化了控制机构并同时保证了控制的效果.自适应控制能前馈补偿反作用干扰及环境干扰对船体的作用,使船体能以...     

绞吸挖泥船仿真训练系统的设计及实现

为了提高疏浚培训质量,发展疏浚新工艺,研发一种绞吸挖泥船仿真训练系统.根据对绞吸挖泥船的结构特点和施工过程的分析,设计基于PLC的仿真驱动模块;基于DirectX的三维视景模块以及与实船一致的硬件操作平台,阐述三维视景模块的硬件和软件实现方法;通过分析根据疏浚过程所建立的疏浚动态方程的特点,提出基于PLC实现仿真驱动模...