大型集装箱码头堆场装卸工艺研究

轮胎式场桥与轨道式场桥是当今大型集装箱码头堆场上采用的两种主要机型。结合具体工程从这两种设备本身以及相关的供电、土建基础设施等方面对这两种典型装卸工艺方案进行比较,以全系统的综合技术经济指标进行了方案比选。     

某软弱路基冲压与强夯处理对比试验研究

对同种地基采用不同的方法进行处理,均可能达到处理目的,但其处理效果和对工程的适宜性会有所区别。在某大型公路工程的软弱地基处理中,分别进行了冲击压实处理和强夯处理的试验。在两种施工方法工后检测中,分别对干密度、压缩模量、面层强度等指标进行了对比研究,并对两种方法的工效进行了比较。结果表明:冲压处理的效果和工艺效益均要优于强夯处理。     

散装货船装卸过程的潜在危险

[摘 要]以散装货船装卸货的特殊性为出发点,介绍了散装货船在装卸货物过程中可能存在的潜在危险及防范措施,旨在保证散装货船装卸过程中的安全。     

港口装卸工属具管理的思考

以天津港为例,结合国内各大港口实际情况,对目前港口装卸工属具的使用管理存在的问题进行了分析,提出建设港口工属具管理中心的构想,并对其实施方案和效益进行了初步分析。     

几种具有特点的散货机械机型介绍

ZPMC近年来研制了多种新型散货机械,包括既可卸集装箱又能用抓斗作业的多功能卸船机、适用于20万t散货船的4 500 t/h装船机、3 000 t/h斗轮堆取料机以及三翻翻车机等,这些机型技术先进,结构上越来越完善.     

悬停系统运行品质对潜艇悬停操纵的影响

为满足潜艇水下悬停的战术需求,潜艇悬停系统必须控制潜艇按规定的稳定精度悬停在指令深度上,因此悬停系统运行品质对潜艇能否顺利完成战术任务较为重要。以模型潜艇为研究对象,在潜艇悬停运动基本数学模型、海洋环境干扰力模型和悬停水舱注排水控制模型的基础上进行仿真计算,研究悬停系统运行品质的3个关键指标,即流量计误差、悬停水舱注排水速率和最小注排水量对潜艇悬停操纵的影响,分析悬停系统运行品质与悬停稳定性之间的逻辑关系,研究结论可为悬停系统关键指标的设计优化和潜艇操艇系统的性能改进提供有益参考。     

探地雷达在隧道衬砌质量检测中的应用

在隧道工程的质量检测过程中,作为新型无损检测设备,探地雷达因具有携带方便、非破坏性、检测快速、精度高等特点,越来越受到广大技术人员的青睐。被广泛的应用于隧道衬砌的厚度、密实性、钢筋分布情况的检测及进行超前地质预报等。     

Analysis and optimisation of objective vehicle dynamics testing in winter conditions

Objective testing of vehicle handling in winter conditions has not been implemented yet because of its low repeatability and its low signal-to-noise ratio. Enabling this testing, by identifying robust manoeuvres and metrics, was the aim of this study. This has been achieved by using both experimental data, gathered with steering-robot tests on ice, and simulation models of different complexities. Simple bicycle models with brush and MF-tyre models were built, both optimally parameterised against the experimental data. The brush model presented a better balance in complexity performance. This model was also implemented in a Kalman filter to reduce measurement noise; however, a simpler low-pass filter showed almost similar results at lower cost. A more advanced full vehicle model was built in VI-CarRealTime, based on kinematics and compliance data, damper measurements, and real tyre measurements in winter conditions. This model offered better results and was therefore chosen to optimise the initial manoeuvres through test design and simulations. A sensitivity analysis (ANOVA) of the experimental data allowed one to classify the robustness of the metrics. Finally, to validate the results, the proposed and the initial manoeuvres were tested back to back in a new winter campaign.     

String tyre model for evaluating steering agility performance using tyre cornering force and lateral static characteristics

The cornering force and lateral static characteristics of a tyre are fundamental factors that describe the steering feel for handling performance. However, it is difficult to justify the contribution of each factor when the tyre’s cornering motion is evaluated through subjective assessment. Currently, the relaxation length of Pacejka’s tyre model is close to describing these tyre motions. Therefore, this paper proposes a string tyre model based on the relaxation length in order to represent the steering performance. The proposed method provides a more accurate modelling of the steering agility performance. Therefore, it is possible to use this model to predict the steering response performance, and this is validated through comparison with a real relaxation length.     

港口物流系统分析及其综合通过能力研究

应用系统科学和网络优化的思想、原理和方法,对港口物流系统结构和功能进行分析;然后简述各主要作业环节和各主要子系统通过能力;最后研究港口物流系统综合通过能力的协调理论和计算方法;同时用一算例进一步检验,提出提高港口物流系统综合通过能力的主要措施。