短波增阻对船舶失速系数的影响分析

船舶失速系数fw的理论预报较为复杂,仅就波浪增阻这一影响fw的重要因素,选择一条8万t级散货船开展了模型试验研究.试验结果表明,在BF6级典型海况中短波增阻占到船舶波浪增阻的50%左右,由此试验结果分析失速系数fw表明短波增阻对fw的影响可达3%.这一研究表明对于大中型船舶,短波成份是影响波浪增阻的重要因素,需要在模型试验和数值计算中重点关注.     

浮式生产储油船(FPSO)电气设备舱的HVAC设计

由于FPSO与通常的船舶有较大的不同,对于一些特殊处所的空调通风系统的设计,具有其本身的特点,而这些特点和它的特殊要求,通常的规范、规则和设计手册上均无明确规定.通过FPSO上的电气设备舱室空调通风系统的设计,对这些特殊处所作些介绍并提出了一些应注意的问题以及设计参数的选择,供设计人员参考.     

Systematic study on the hull form design and resistance prediction of displacement-type super-high-speed ships

Systematic theoretical and experimental studies were carried out to establish methods for hull form design, optimum dimension selection, and resistance estimation for displacement-type super-high-speed ships. In this study, a theoretical hull form design method for displacement-type super-high-speed ships was first developed using the minimum resistance theory and a sectionally varying hull form equation. Using an established hull form design method, a series of 60 hull forms were prepared with systematic variations of the most important design variables, and model tests were conducted for these ship models. Finally, regression analyses were performed for the results of the model tests. The study was very successful, and the prepared computer programs are now being actively used as efficient tools for the design of the displacement-type super-high-speed ships.     

基于FFT的学生公寓典型负荷特性研究

为了掌握学生公寓用电负荷的使用情况，从而更好的限制违章电器的使用，保证用电安全。运用傅立叶变换对学生公寓用电负载的波形进行分析与讨论，利用电压和电流的各频率分量的幅值和相位的对应关系，对学生公寓典型的负荷特性进行研究。该方法能够识别出学生公寓的典型负荷，在实际应用中具有可靠性和实用性。     

Development of evolutionary cone type LSD for SUV/RV utilizing the axiomatic approach and the ultrasonic nano crystal surface modification technology

Surface topology, cone angle and the forces acting on the cone of the clutch type limited slip differential (LSD) are major design parameters for the bias ratio and the noise condition. Therefore much research has been dedicated to these developments but the results have been used to submit patents. A new cone type limited slip differential for sport utility vehicles and recreational vehicles, which has a very simple structure and easy compliance with the vehicle performance, has been developed by the axiomatic approach and the ultrasonic nano crystal surface modification (UNSM) technology. The design criteria and optimal value of the design parameters are determined by the axiomatic approach utilizing CAE tools. Test methodologies in a test rig and in a vehicle were also developed. Test results showed good performance of bias ratio and noise level but durability is still under testing. This study is an extension of F2006P266, FISITA 2006.     

Design of Integrated Chassis Control logics for AFS and ESP

The performance of most electronic chassis control systems in the past has been optimized individually. Recently, a great research effort has been dedicated to the integration of chassis control systems in an effort to improve the vehicle performance. This involves orchestration of individual control modules so that they can jointly contribute to the enhancement of their control effect. In this research, two integrated control logics for AFS (Active Front Steering) and ESP (Electronic Stability Program) have been developed. Of the two logics, one uses a supervisor that rules over the individual modules. The other logic uses a CL (Characteristic Locus) method, which is a frequency-domain multivariable control technique. The two logics have been tested under various driving conditions to investigate their control effects. The results indicate that the proposed integrated control logics can yield vehicle performance that is superior to that of the individual control modules without any integration scheme.     

指定资金约束的高速公路养护决策算法研究

应用工程经济原理与方法对高速公路路面养护管理费用进行了分析。针对养护决策优化中指定资金约束下的养护方案优选问题,以养护费用关系为基础开发了指定资金约束条件下的高速公路养护决策动态规划算法,并基于组合预测的思想对算法中状态转移预测进行了研究。实例表明决策方案得到改善。     

使用燃料电池的铁道车辆转向架驱动试验

在全球环保的号召下,世界各地对节约能源和降低环境负担的要求与日俱增.因此,使用以氢作为洁净、高效能源的燃料电池来驱动车辆正引起人们的关注.日本铁道技术综研所(RTRI)根据过去的研究成果,于2001年开始开发使用燃料电池的铁道车辆,并报道了用铁道车辆转向架进行驱动试验的结果.     

机车的直接传动

长期以来,设计人员希望能简化电力机车动车的传动装置,尤其是希望去掉传动齿轮.为此对直接传动作了许多研究试验.牵引电动机去掉传动齿轮,必须按传动比发挥相应大的转矩.转矩大小对电机的体积有着决定性的影响.所以不是所有类型的电机都适用于直接传动.文章在永磁同步电机的基础上研究了全弹性悬挂和非弹性悬挂的机车直接传动.     

部分逆筑法地铁车站围护结构设计浅析

以上海轨道交通9号线外环路站为实例,介绍了部分逆筑法施工的地铁车站深基坑围护结构形式,及其结构设计;着重介绍了基坑围护结构的计算模型设定、基坑稳定性计算,及围护结构的基础施工步骤.该站的部分逆筑法施工现已完成,结果表明设计是成功的.