多层废旧轮胎半潜式防波堤消浪性能研究

采用物理模型试验方法,研究了一种新型半潜式防波堤——多层废旧轮胎半潜式防波堤的消浪性能(透射系数)及其影响因素。研究表明:多层废旧轮胎半潜式防波堤的消浪性能主要受模型层数、相对潜水深度、波高和周期的影响。与同类型单层模型相比,其透射系数小,消浪效果明显。此外,模型随着下潜深度的增加,其透射系数呈现出规律性变化,下潜深度在0.08 m时(模型比例1∶30),消浪效果最佳。

Parameter identification and pressure control of dynamic system in shield tunneling using least squares method

An estimation approach using least squares method was presented for identificationof model parameters of pressure control in shield tunneling.The state equation ofthe pressure control system for shield tunneling was analytically derived based on themass equilibrium principle that the entry mass of the pressure chamber from cutting headwas equal to excluding mass from the screw conveyor.The randomly observed noise wasnumerically simulated and mixed to simulated observation values of system responses.The numerical simulation shows that the state equation of the pressure control system forshield tunneling is reasonable and the proposed estimation approach is effective even ifthe random observation noise exists.The robustness of the controlling procedure is validatedby numerical simulation results.

半潜直立筒式消浪结构性能的试验研究

在加强海水交换及不影响海域景观的前提下,基于物理实验模型提出了一种半潜直立筒式消浪结构,并对其在不同参数的规则波作用下的消浪效果进行了研究。主要从波浪周期、入射波波高、模型排数、间距及下潜深度的变化来探究其消浪性能。试验结果表明,此消浪结构具有良好的消浪效果,在一定程度上可以缓解海岸侵蚀现象的发生,为今后推广应用提供依据。

半潜条件下双层四环网结构消浪性能研究

通过物理模型实验,研究了半潜式双层四环网新型消浪结构的消浪性能。主要研究了波浪周期、入射波波高、模型排布宽度、模型层间距以及模型下潜深度对其在不同工况下消浪性能的影响。实验结果表明:本结构消浪效果比较明显,最小透射系数达到了0.22。