铁路高边坡防护与整治

结合浙赣线D1K896+683～D1K897+500段高边坡的工程地质条件、设计、施工等实际情况,分析了高边坡溜坍和开裂原因,采用多种措施对病害处进行了临时加固并采取了确保高边坡稳定的永久加固措施。实践表明,加固效果良好,达到了整治效果,可为同类高边坡溜坍和开裂情况提供参考。     

襟翼舵的开发利用

船用襟翼舵多应用在操纵性要求较高的海洋船舶上,其优良的操纵能力及安全可靠的工作性能已经得到了广大设计部门和船东的认可。文中介绍了襟翼舵的工作原理和实船应用情况,通过对船用襟翼舵工作原理和结构形式的研究,扩展了其在船舶上的应用,文中对船用襟翼舵替代侧推的方法和刹车制动功能进行了分析论证,给出了具体计算实例。     

Engineering design optimization based on intelligent response surface methodology

An intelligent response surface methodology （IRSM） was proposed to achieve the most competitive metal forming products, in which artificial intelligence technologies are introduced into the optimization process. It is used as simple and inexpensive replacement for computationally expensive simulation model. In IRSM, the optimal design space can be reduced greatly without any prior information about function distribution. Also, by identifying the approximation error region, new design points can be supplemented correspondingly to improve the response surface model effectively. The procedure is iterated until the accuracy reaches the desired threshold value. Thus, the global optimization can be performed based on this substitute model. Finally, we present an optimization design example about roll forming of a ＂U＂ channel product.     

高墩曲线连续刚构桥的结构稳定性分析

该文以欧拉弹性理论为基础,运用空间有限元法对高墩曲线连续刚构桥在施工最大悬臂状态下的T构进行稳定性分析。计算不同工况下的结构稳定特征值,以此对高墩曲线连续刚构桥的T构施工过程进行监控。     

大型集装箱船中压岸电系统应用研究

中压岸电系统的应用在我国仍然处于起步阶段。为推动我国船舶岸电系统(简称AMP系统)的发展,对中压AMP系统进行了深入研究。通过对中压AMP系统的结构以及快速连接、无缝切换、变频稳压三项关键技术介绍,建立了理论基础。以CO2为例对AMP系统进行环境效益分析,验证了其发展的必要性。     

邮轮居住舱室结构净高控制方法

为了保证邮轮舱室结构净高度,避免建造中因为舱室结构净高度不足造成的施工返修,分析豪华邮轮居住舱室结构净高度控制难点,采取加强精度控制、设计优化、现场管理等先进工艺和技术管理措施,开发使用邮轮翻身工装、电磁矫平设备等关键工具工装,为邮轮建造居住舱室结构净高度控制提供了针对性的改善方案。     

CATIA二次开发在船舶建模与评估中的应用

为提高CATIA在船舶建模评估应用中的效率与精度,使用VB编程语言对CATIA进行二次开发,建立界面,不仅可方便地输入舵参数,快速创建舵和舵踵曲面,而且可设定吃水高度、海水密度、船壳厚度等,以统计主尺度、船形系数和尺度比等多种船体主要要素并自动导出,大幅提高多方案建模与评估的工作效率。给出程序思想和关键程序代码,对相关软件开发具有参考作用。     

A line impedance stabilization network for pulse current injection北大核心CSCD

［Objective］Aiming at the deficiency of the existing line impedance stability network (LISN) in the electromagnetic pulse protection capability, a LISN suitable for the pulse current injection (PCI) test of electrical and electronic equipment is proposed. ［Methods］Aiming at the characteristics of high peak value and fast rise of the pulse current in PCI testing, the circuit structure and physical structure of the LISN are improved on the existing basis through PSpice time-domain and frequency-domain simulation combined with engineering design requirements, thereby giving it good nanosecond pulse protection performance and impedance stability at the same time. Pulse current protection performance test and impedance curve test experiments are then designed and carried out.［Results］The experimental results show that the improved LISN can attenuate the injected pulse current by 60 times, while the error of its impedance curve is less than 5% compared with the Type 5 µH LISN in GJB 151B-2013. ［Conclusions］The proposed LISN has good impedance stability and decoupling ability, and can be used in the PCI testing of electrical and electronic equipment in order to protect the power supply and improve the repeatability of testing. © 2023 Chinese Journal of Ship Research. All rights reserved.     

船舶轴舵系安装设备的虚拟设计与装配

以船舶轴舵系安装设备为例,使用SolidWorks软件设计建立轴舵系安装设备的三维实体模型,研究轴舵系安装设备的安装过程和安装工艺,并对轴舵系安装设备的干涉检查及装配约束进行仿真分析,以验证轴舵系安装设备在设计及安装工艺方面的准确性和适用性,对提高造船设备产品质量、降低产品设计误差、缩短生产周期、优化装配流程具有重要意...     

Fatigue damage prediction of ship rudders under vortex-induced vibration using orthonormal modal FSI analysis

Recently, the fatigue failure of ship rudders owing to vortex-induced vibration has increased as commercial ships become faster and larger. However, previous methods are inappropriate for fatigue failure prevention owing to the lack of fluid–structure interaction considerations. This study aims to develop a fatigue damage prediction method that can be applied at the design stage to prevent fatigue failure of ship rudders under vortex-induced vibration. The developed prediction method employed the fluid–structure interaction (FSI) method to properly consider the fluid–structure interaction and implemented orthonormal mode shapes to reflect the complex geometry and boundary conditions of the ship rudders. For validation, vortex-induced vibration of the hydrofoil model was obtained using the developed method, and the prediction results matched well with the experimental results. Then, the fatigue damage of the ship rudder model under vortex-induced vibration was predicted using the developed method, and their characteristics are discussed. The stress distribution obtained using the developed method matched well with the geometrical characteristics of the ship rudders. The potential for fatigue failure due to the resonance of vortex-induced vibration was expected by comparing the stress distributions for various flow velocities to the S–N curves provided by the DNV classification.