构建城市RBD游憩商业区研究——以重庆市南滨路为例

在分析城市游憩商业区形成原因和动力机制的基础上,对重庆市游憩商业区发展的必然性及其范围进行了探讨,并阐述了重庆市游憩商业区发展的动力条件和发展对策。     

关于轨道谱面积与TQI指标关系的研究

根据沪昆和金温两条不同线路的轨道不平顺检测数据,利用Matlab编程分别进行功率谱和TQI分析。然后利用梯形积分公式对各项轨道不平顺谱值进行积分,得出TQI单项指数与各轨道不平顺谱面积值具有很好的相关性,特别是在高低和轨向不平顺上,相关系数达到了0．91以上,从而验证了用轨道不平顺功率谱方法来控制和管理轨道平顺性的可靠性。最后建议将轨道不平顺功率谱作为控制提速线路轨道质量的主要指标之一。     

Optimal container ship size: a global cost minimization approach

ABSTRACT

Currently, the best container ship size in a service is determined mainly by the liner operator, considering only the economies of scale of ships. Its external diseconomies to the ports and shippers are usually not considered in the decision-making process, which may reduce the overall efficiency and lead to global nonoptimality. This study incorporates the cost to the shipping companies at the main lines, ports, and feeder services, as well as the external costs to shippers and ports in a hub-and-spoke network, and determines the best ship size and the number of weekly services to minimize the overall costs. The external cost to the shippers in the feeder ports is assumed to be proportional to the feeder cost, and a sensitivity analysis is provided. The maximum container ship size is estimated according to different levels of freight demand. A numerical analysis shows that the optimal size should be smaller than the current biggest container ships in service.     

国产化盾构掘进自动导向系统的研制

介绍了盾构掘进自动导向系统的发展过程，提出研制国产化盾构掘进自动导向系统的依据，分析了系统的基本组成、基本原理、软件计算法和可靠性设计特点，通过推广应用，证明该系统具有高可靠性和高稳定性，达到国际同类产品的技术性能。     

Research on the performance of passive heave compensator for tethered remotely operated vehicle system

A passive heave compensator is designed to enhance the operation safety of a 4.5 km remotely operated vehicle (ROV). This paper proposes a novel idea of designing a compensator with relatively low natural period to optimize gas volume and while adding a special device to remove the problem of ineffectiveness and resonance in long seas. Numerical simulations are done based on serious dynamic model of the whole system, including the compensator, the umbilical tether and the vehicle, solved by the fourth-order Runge-Kutta scheme. The compensator provides great attenuation of motion and tension in most sea states. As the working depth increases, the system natural period decreases, resulting in the occurrence of risk of resonance. By regulating the system damping, the compensator can be effective in these situations.     

"海龙-3500"深海潜水器的变长缆运动建模与仿真

仿真并分析了“海龙-3500”深海潜水器(ROV)出中继器后的运动过程。考虑海流的影响,ROV的建模采用通用的动力学模型,轻缆的建模采用凝聚参数法。结果表明,设定的放缆方案是合理的,可作实际操作参考。提供的缆和ROV系统的仿真算法,可用作实际操作前的模拟计算。     

城区爆破振动控制孔内外分段接力起爆技术及其应用

深圳市盐田港保税区北片区一期机械土石方工程总量483万m3,工期2年,最高爆破开挖月产量30万m3。在工程实践中,采用了孔内外分段接力起爆技术,成功地解决了爆破振动的控制问题,确保了周围建(构)筑物的安全。     

探讨将心理因素纳入我局选拔调车作业人员的可行性

目的 :探讨将心理因素纳入选拔调车作业人员的可行性。方法 :对 1 986～ 1 996年发生车辆伤害事故及原同班组未发生事故的调车作业人员进行艾森克个性问卷和症状自评量表的调查。结果 :事故组性格内向 ,身心状况较差 ,存在明显的躯体化症状、强迫症状、抑郁、焦虑、敌对、精神病性和睡眠、饮食等问题。结论 :在我局尽快建立起调车作业人员的筛选标准 ,将心理卫生因素纳入标准之中     

300km／h高速动车组集成制造系统方案设计及关键技术研究

对高速动车组集成制造系统总体解决方案的体系结构、关键技术及具体解决途径等进行了详细论述。通过在企业的成功应用,验证了该技术方案的合理性和有效性。     

A型地铁车辆新型转向架的研制

城市轨道交通车辆转向架的研制是一个复杂的系统工程.转向架的整体设计与线路、限界条件、传动技术的发展以及转向架基础零部件的技术水平等密切相关.在已成功研制出国产A型车的背景条件下,通过对国内外A型地铁车辆转向架技术状况进行调研,结合国内线路情况对转向架的要求,提出了新的转向架设计方案.在对转向架的结构设计完成后,利用有限元CAE技术对转向架的结构强度和模态进行了分析,相关参数指标均满足规范要求.