基于DSP的低压断路器校验电源的研制

利用电力电子技术的拓扑结构,采用基于DSP芯片的控制电路,研制了用于舰船热继电器及塑壳断路器校验所需要的交流电源装置.与传统电源相比较,不但电源装置的体积明显减少,而且输出的电流精度高,动态响应速度快,此外所研制的电源装置采用友好的人机界面,使试验过程变得简单容易,可以降低试验人员的劳动强度.     

基于干扰观测器的舵阻摇PID控制

以船舶运动的横摇模型为研究对象,在常规PID控制器的基础上设计海浪干扰观测器,实现对海浪干扰的等效补偿,增强舵阻摇PID控制器的鲁棒性。仿真结果表明本文方法的有效性。     

高桩码头设计中波浪力计算方法的探讨

透空式高桩码头上部结构与波浪相互作用的问题非常复杂,现行规范找不到计算依据。在无规范依据情况下, 高桩码头设计时一般采用《海港码头结构设计手册》中进行波对码头上部结构作用力公式进行计算。根据设计手册相关 公式,提出了采用AutoCAD制图软件绘制理论波面的图形计算方法。并通过在AutoCAD中调整波面与码头结构断面相对位 置,分工况计算了某工程实例,供工程设计时参考。     

液化天然气码头进港航道平面布置设计

进港航道是港口水域平面设计中重要的环节,航道平面布置选线是港口航道设计的关键;液化天然气码头因其 货种特殊性,对船舶进出港航行安全保障要求高。结合实际工程,列出液化天然气码头进港航道平面布置设计思路;综合 考虑航道布置的平面约束因素,提出方案并进行比选,最后确定推荐方案,研究方法可为类似工程提供参考。     

海底犁式挖沟机犁体曲面优化设计(英文)

The plow of the submarine plowing trencher is one of the main functional mechanisms, and its optimization is very important. The design parameters play a very significant role in determining the requirements of the towing force of a vessel. A multi-objective genetic algorithm based on analytical models of the plow surface has been examined and applied in efforts to obtain optimal design of the plow. For a specific soil condition, the draft force and moldboard surface area which are the key parameters in the working process of the plow are optimized by finding the corresponding optimal values of the plow blade penetration angle and two surface angles of the main cutting blade of the plow. Parameters such as the moldboard side angle of deviation, moldboard lift angle, angular variation of the tangent line, and the spanning length are also analyzed with respect to the force of the moldboard surface along soil flow direction. Results show that the optimized plow has an improved plow performance. The draft forces of the main cutting blade and the moldboard are 10.6% and 7%, respectively, less than the original design. The standard deviation of Gaussian curvature of moldboard is lowered by 64.5%, which implies that the smoothness of the optimized moldboard surface is much greater than the original.     

基于OSG的海洋漫游场景开发

针对海上环境气候复杂,模拟困难等原因,本系统在基于OSG三维渲染引擎的基础上,借助OsgOcean场景实现了第一视角的海洋场景漫游,包括船舶模型的调换,天气变化,键盘事件响应来控制船舶运动。首先通过将OSG视景窗口嵌入MFC框架下,并在OSG核心类cOSG中响应海洋场景的生成;其次在模型节点中通过添加和移除节点,动态实现船舶模型的加载和转换,然后通过天空盒中阳光在海面产生的不同光照效果,利用着色器,渲染不同气候下海面的颜色;最后通过OSG三维渲染引擎中的粒子效果,将自定义粒子模块实时加载到场景中,用来模拟大自然中的雨、雪效果。     

Passengers’ Perceived Service Quality of City Buses in Taipei: Scale Development and Measurement

Abstract

To understand fully passengers’ perceptions and expectations of the bus service quality in Taipei, business managers and governmental agencies must seek a proper scale that can reflect passengers’ opinions accurately. This study develops and tests a service quality scale designed for a city bus transit system in Taipei. Churchill’s paradigm and a focus group interview were combined into a multistage scale development procedure. Based on the procedure, Taipei city buses were selected as the example, for which a service quality scale was developed. The final scale contains four dimensions and 20 items. These four dimensions are ‘interaction with passengers’, ‘tangible service equipment’, ‘convenience of service’ and ‘operating management support’. Finally, the results of scale development and the managerial applications of the service quality scale for the city transit system are discussed.     

External Costs of Domestic Container Transportation: Short‐Sea Shipping versus Trucking in Taiwan

Abstract

This paper explores the external costs of domestic container transportation in Taiwan by analysing the origin and destination of current container cargoes. After reviewing an extensive literature survey of methods of external cost, a comparison of external costs between trucking and short sea shipping (SSS) by corridor is made by using a model developed in this paper. Based on the findings that external costs of SSS are considerably lower than truck transport and can be a viable alternative to current domestic container cargo transportation, we discuss the significance and managerial implications of SSS from the perspective of green logistics. In so doing, a top‐down approach is employed for developing government policies, which aim to not only reduce the external costs of domestic container transportation but also promote SSS in Taiwan.     

浅谈利用ETC技术进行交叉口信号灯智能控制的优化

提出了一种利用ETC技术进行城市道路交叉口信号灯智能控制的优化措施,利用ETC设备的现有功能,通过收集交叉口等候车辆的信息,经计算机中心处理后,予以智能化控制,缩短交叉口车辆等候时间,提高道路通行效率。     

模糊评价法在铁路运营隧道安全状态综合评判中的应用

影响铁路运营隧道安全性的因素众多。该文从铁路运营隧道安全性研究的需要出发,构建评价指标体系。在对铁路运营隧道安全性的主要因素分析基础上,通过相应指标的主要参数划分等级,提出定性和定量结合的多指标、多参数运营隧道安全性评定模型和方法。在评价因素选取、权重分配方面对各种因素给予考虑。并根据隶属函数的性质确定了综合评判矩阵的计算方法。该模糊综合评价模型与我国既有隧道安全性评价方法相比,更能反映铁路运营隧道的实际情况,具有良好的可靠性和准确性。