清平磷矿客货两用架空索道设计

系统介绍了四川清平磷矿客货两用架空索道工艺系统方案的确定及线路、上下站等主要构成部分的设备配置、方案优化与主要设备的性能、技术参数，还对系统中的安全设施、事故救护作了说明。     

ZigBee网络路径均衡算法在供水系统的仿真研究

研究城市供水系统的高效路径均衡算法。供水系统根据供水请求调控供水路径,在早晚城市用水高峰期供水请求突增,待均衡的供水路径任务骤增加大了均衡计算量,传统方法只选用较少的高层节点作为均衡节点,高层节点因超额的工作量不能承担起均衡任务的突增,造成网络数据传输路径均衡的效率较低。为了解决这一难题,提出基于开销能量的供水系统ZigBee网络路径均衡算法。通过建立供水系统各节点能量消耗代价开销模型,在模型中根据开销能量将路径均衡控制的任务分派到网络的各个节点中共同分担完成路径均衡的任务,避免了只利用少数高层节点均衡而带来的均衡效率不高的问题。仿真结果表明,改进方法能够高效完成供水系统路径的均衡控制,取得了满意的结果。     

An analytical framework for integrated maritime terminal scheduling problems with time windows

Container transport, an integral part of intercontinental trade, has steadily increased over the past few decades. The productivity of such a system, in part, hinges on the efficient allocation of terminal resources such that the container transit time is minimized. This study provides an analytical framework, which entails efficient scheduling of quay and yard cranes, to minimize the time spent by containers at a terminal. A mixed-integer programming model is developed to capture the two-stage multi-processor characteristic of the problem, where each crane has specific time window availability. A genetic algorithm equipped with a novel decoding procedure is developed. The mixed-integer model is tested on a number of problem instances of varying sizes to gain managerial insights.     

基于Elman超声信号时间融合的塔机防碰撞技术

针对塔机防碰撞以缺乏灵活性和时实性的被动防御为主的现状,为实现智能化主动防碰撞的目的,通过分析障碍物轮廓与超声测距时间序列间的映射关系,以时间融合的思想引入Elman网络,并通过变形输入输出实现了单超声传感器由测距序列快速识别障碍物高精度位置信息的功能,并经试验验证可以达到预期低成本、快速度、高精度的塔机工作使用要求,也为低精度传感器获取高精度融合结果提出借鉴思路。     

基于故障树和双向联想记忆神经网络的桥式起重机故障诊断方法

针对桥式起重机的故障诊断系统,提出一种基于故障树(FTA)和双向联想记忆神经网络(BAM)相结合的故障诊断方法。通过FTA建立系统故障树,收集桥式起重机所有故障模式,进而归纳出BAM的学习样本,然后对样本学习联想,得到系统诊断结果。两种方法的结合,不但可完成单个故障的诊断,还可实现多种故障的综合处理,提高诊断能力。     

自动化码头堆场穿越式双ASC调度

随着人工智能等科技的发展,海铁联运的运输模式加快了集装箱码头自动化的发展进程,自动化已经成为集装箱码头发展的必然趋势。对自动化集装箱码头堆场内可穿越式双自动堆垛起重机（ASC）在同一箱区内进行作业的过程进行研究,考虑不同大小的ASC的运行速度和单位时间内耗能不一样,以及在同一贝位两个ASC存在冲突的情况,建立多目标混合整数模型,得出完成所有集装箱任务的总时间和总耗能。并通过改变不同的参数来设计三组实验,实验结果表明,可以通过调整集装箱任务量、双ASC的速度、双ASC装载和空载的耗能之比来减少码头作业集装箱任务的总时间和总能耗。     

三峡库区白鹤梁题刻原址水下保护工程设计

三峡水利枢纽工程建成后,水库正常蓄水位将提高到175 m,库区有大量的文物需要保护。白鹤梁题刻既是国家级文物,也是三峡工程文物保护的重点,由于其特殊的地理条件和保护要求,保护方案几经论证才最终形成。介绍了用“无压容器”概念修建白鹤梁题刻原址保护工程方案的设计理念及主要设计成果。工程于2003年2月开工建设,2009年5月建成开馆。这一极具创新设想的工程实施,成为世界上唯一的遗址类水下博物馆,为水下文化遗产的原址保护提供了成功的工程范例。     

基于COSMOS／Works的汽车起重机转台有限元分析

转台是汽车起重机的主要承载件之一,通过分析转台受力情况,建立力学模型,应用COSMOS／Works对转台结构进行有限元分析,其分析结果对汽车起重机设计具有重要指导意义。     

铸造起重机中行星减速机的断轴检测与保护

本文介绍了行星减速机在铸造起重机主起升机构中的应用,并针对行星减速机存在的断轴问题,详细介绍了断轴保护的原理,并分别在PLC控制系统和逆变器程序中进行编程,对行星减速机断轴保护问题提出了合理的解决方案。     

Integrated mathematical optimisation approach for the tower crane hook routing problem to satisfy material demand requests on-site

Optimising decisions around the location and operation of tower cranes can improve the workflow in construction projects. Traditionally, the location and allocation problems involved in tower crane operations in the literature have been solved separately from the assignment of material supply points to demand points and the scheduling of the crane’s activity sequence across supply and demand points on a construction site. To address the gap, this paper proposes a binary integer programming problem, where location of the tower crane, allocation of supply points to material-demanding regions, and routing of hook of the crane based on activity sequencing of the hook across supply and material-demanding regions on site are optimised. The novelty in this work is in the way the crane’s activity scheduling is modelled via mathematical programming, based on routing the hook movement to meet material demand, through minimising tower crane operating costs. A realistic case study is solved to assess the validity of the model. The model is contrasted with results obtained from other solving algorithms commonly adopted in the literature, along with a solution proposed by an experienced practitioner. Results indicate that all instances can be solved when compared to other meta-heuristics that fail to achieve an optimum solution. Compared to the solution proposed by the practitioner, the results of the proposed model achieve a 46% improvement in objective function value. Planners should optimise decisions related to the location of the crane, the crane’s hook movement to meet service requests, and supply points’ locations and assignment to material-demanding regions simultaneously for effective crane operations.