Investigation of the condition and the behavior of a modular floating structure by harnessing monitoring data

In this paper, the condition and the behavior of an installed and operating Modular Floating Structure (MFS) is investigated and assessed by harnessing field monitoring data and using collectively multiple Correlation Coefficients (CCs) between measured quantities. The examined MFS consists of five pairs of interconnected floating concrete modules and it functions as a floating breakwater. The field monitoring data are acquired through a sensor network deployed on one pair of modules (connected through two groups of connectors) of the MFS. A methodological data processing framework for data organization, manipulation and post-processing is developed and presented. This framework enables the quantification of the structure's condition at different time periods through the calculation of CCs: (a) between the incident wave height and the tensions of the mooring lines and (b) between the tensions of the mooring lines, considering various wave directions. Recorded data at three characteristic time periods during the structure's lifetime are used, namely: (i) before any failure (structure's initial condition), (ii) after the failure of the first connectors' group and (iii) after the failure of the second connectors' group. The data processing framework developed in the present paper is applied to the above recorded data in order to calculate CCs and, therefore, quantify the structure's condition, at the three aforementioned time periods. The quantification of the structure's initial condition resulted to conclusions that were consistent from a physical point of view with the most recently documented, available in-situ mapping of the mooring lines' configuration in the horizontal plane. By considering the structure's initial condition as a reference base for comparison, the effect of the connectors' failure on the CCs, used to quantify this condition, was also investigated and efficiently assessed. Specifically, the significant changes observed in the variation patterns of all examined CCs, when compared with their respective patterns corresponding to the structure's initial condition, demonstrated and confirmed the existence of significant reformation of the examined structural system resulting from the connectors' failure. In this way, the effectiveness of the joint utilization of CCs to assess the structure's condition was proved.     

舰船柴油机的模块化建模与仿真

在柴燃联合动力装置半物理仿真平台的研究中，要求建立的柴油机模型能够较准确地反映瞬态过程中各主要参数的变化，满足进行实时仿真对模型的要求，同时具有通用性，以提高仿真模型的重复利用率。使用容积法建立涡轮增压柴油机模型，可以避免准稳态法中流量和压力关系的迭代计算，同时对计算量的要求又在合理的范围内。在大型系统仿真软件Easy5的支持下，采用了模块化的建模和仿真方法，利用已建立的舰船柴油机的模块库，可以连接组合模块建立各种配置的舰船柴油机模型。作为应用实例，建立了相继增压柴油机模型，并进行动态仿真。     

Consequences of Nonlinear Characteristics of a Secondary Suspension in a Three-Piece Freight Car Bogie

Mechanical systems with nonlinear characteristics can show a complex dynamic behavior that should be taken into account when analysing dynamic performance and reliability. The dynamic behavior of the main suspension in a three-piece freight car bogie with constant friction damping is considered in this work. The aim is to investigate the vertical behavior of a specific suspension design due to different driving conditions, weather and wear of the friction wedges. A variation in weather and wear is represented by different friction configurations in the model of the suspension. Models of different levels of detail that are based on experimental data on existing designs are developed. It is found that the suspension performance is very sensitive to variations of the friction configuration and this indicates a possible presence of nonlinear dynamic phenomena at in service like conditions.     

A NEW URBAN FORM AND ITS INNOVATIVE TRANSPORTATION STRATEGY TO ACCOMMODATE URBAN GROWTH

If we are to accommodate the rate of urban growth which North America will face in the first half of the twenty-first century, it is the contention of this paper that we must build new cities, not new towns, beyond commuting distance of existing cities. These can be located in open countryside on virgin land, or they can grow around existing small towns, all in conjunction with the construction of an innovative personal transportation system. In this paper a hexagonal modular structure, in which self-contained urban units can be combined and added to over time, is proposed as a new urban form and AVCS maglev — which will serve the new cities efficiently — is proposed as a key transportation strategy.     

高职模块化课程教学管理研究

文章阐述了模块化课程教学的内涵、特点及意义,并从课程体系设置、日常教学管理、网络教学管理等方面论述了模块化课程教学管理的具体实施办法,具有一定的实践指导意义。     

500m3水库环保疏浚船模块化结构设计

针对水库环保疏浚挖深大、挖深变化大、船舶到达困难等技术难点，研发一种新型的环保疏浚船。该船的研发采用功能模块化、精巧化的设计理念，创新的浮箱连接组合装置，结合运用有限元直接计算手段，突破了现有拼装疏浚船的浮箱组合型式，既保证了船舶结构强度，又能以最小船舶尺度满足大挖深的需要，同时使船舶能够方便地装卸和通过陆路运输到达施工区域。     

模块化教学模式下中高职课程衔接研究——以南通航运职业技术学院电气自动化专业为例

文章结合南通航运职业技术学院电气自动化专业启动的中高职衔接改革,提出了构建“提升能力、结合证书、模块化设置”的中高职课程衔接的模式,以实现真正意义上的中高职课程衔接。     

高职航海英语与基础英语的有效衔接再思考

通过探讨航海英语与专业英语衔接的必要性和可能性,本文从航海英语模块化教学角度对航海英语与基础英语的有效衔接进行了再思考。笔者认为为了有效衔接航海英语和基础英语,应该将航海英语课程划分为基础英语模块、基础英语和航海英语衔接模块、航海英语模块和航海英语拓展模块,同时对各模块的内容进行了相应思考。     

船运散装液体化学品溢漏应急地理信息系统的研究

为了有效地减少船运散装液体化学品溢漏事故导致人身伤亡与环境污染，将目前方兴未艾的地理信息系统应用在船运散装液体化学品溢漏事故上，利用Mapinfo自带的二次开发工具MapBasic对船运散装液体化学品溢漏应急地理信息系统做开发研究，取得了实质性的进展。重点介绍了系统的实际开发创建过程（包括数学模型建立，数据库建立与管理，编程语言及其关键技术）以及系统所能实现的功能。希望能为国内外同行的研究提供参考。     

Farm tractor models for research and development purposes

The modelling problems related to the simulation of the dynamics of farm tractors are dealt with. The aim is to develop reliable mathematical models to speed-up the research and development activities in which farm tractors and their sub-systems (driveline, steering and suspension system, etc.) are to be conceived and designed. Two models of farm tractors have been developed. The first model is based on a proprietary software, able to quickly simulate the motion of a vehicle on smooth or rough soil. The second model has been developed by the commercial software ADAMS/Car^®, which allows to model complicated transmission and suspension systems. In both of the two models, the tyres, the transmission system, the suspension system, the steering system, the engine and the body inertia are carefully described mathematically. Both of the two models are defined in a parametric way. Particular attention has been devoted to the measurements of the tyre characteristic and of the inertia parameters of the farm tractor body. For the measurement of tyre characteristics, a new instrumented wheel hub has been used. The accurate measurement of both the tyre characteristic and body inertia tensor has allowed a good agreement between measured and computed time histories referring to a number of validation manoeuvres performed either on-road or off-road. The derived farm tractor models could simulate the working conditions of a generic farm tractor while hauling a plough or while running at a relatively high speed on a rough soil or while steering on a sloped, soft surface.