电动玻璃升降器过流保护分析及措施

在对汽车电动玻璃升降器过流保护问题的分析过程中，提出一种基于PPTC器件的过流保护措施。并在某车型的电动玻璃升降器上进行了PPTC器件过流保护措施的实施、测试和验证，其失效故障得到了有效解决。     

Efficiency sensitivity analysis of a hydrostatic transmission for an off-road multiple axle vehicle

There is a large variety of multiple driven axle vehicles. Some of the most common are the 3-axle rigid vehicles and the 4-axle articulated vehicles, which can in some cases have different steering mechanisms, adaptive suspension, etc. This last kind of vehicles usually have very complex transmission configurations. Moreover, the required torques in each of the wheels can be very different, especially when the vehicle is working in rough terrains. The aim of this work is to study and model the driveline of this kind of vehicles, when using a hydrostatic transmission, from the performance and efficiency point of view, by analysing the influence of the operating conditions in the transmission efficiency. A global model is used to quantify the power flow in each of the transmission elements and the overall performance of the entire vehicle driveline, given the operating conditions thereof. A sensitivity analysis has also been done showing the influence of vehicle speed, rolling resistance, terrain slope and hydraulic motors displacement in the overall transmission efficiency. The interest of this work is also to make a contribution to the literature in the field of global modelling of drivelines under variable operating conditions and its application to ATVs. One important aspect is the influence of different actuation requirements that occur in different wheels at the same time. The results show that the overall performance of the transmission is highly dependent on operating conditions, on the selected transmission configuration and on the used components.     

西安安康线开行摆式列车提速研究

通过对摆式列车提速能力的分析,研究摆式列车各种速度目标值下的平面几何条件标准,提出西康线开行摆式列车提速方案及相应的路段速度目标值,对我国西部山区铁路的提速提供一种思路。     

Selection of techniques for reducing shipping NOx and SOx emissions

This paper develops a subjective generic methodology for providing ship owners with a transparent evaluation tool for selecting their preferred NOx and SOx control techniques. We quantitatively analyse the merits of the control methods available in marine air pollution control practice using data collected from shipping companies, shipyards and maritime academies. We also prioritize the applicable control techniques with respect to operational shipping environments.     

山区河流航道整治导治建筑物的坝体类型及护面结构

“九五”、“十五”期间,国家投入巨资对乌江、西南水运出海通道(贵州段)、赤水河干流航道进行了重点整治,新技术、新材料、新工艺在航道整治中大量应用,并得到推广和发展。本文主要介绍散抛石坝、土工布沙袋坝、竹笼散抛石坝等坝体及坝面结构,并以赤水河为例就其应用效果进行了分析。     

信息化条件下炮兵精确打击毁伤评估研究

分析了信息化条件下炮兵精确打击毁伤评估的特点与要求,并对信息化条件下炮兵精确打击毁伤评估模型进行了分析,最终得出在信息化战场上,对炮兵精确打击进行科学的毁伤评估,可以保证火力资源在作战过程中实现优化分配,对炮兵指挥提供科学的决策依据。     

多天线系统中的波束形成原理辨析

针对研究中经常遇到的波束形成技术容易引起混淆这一问题，分析了智能天线和MIMO这两种多天线系统中波束形成的原理，辨析了各自的涵义，阐明了两种波束形成技术之间的区别与联系。     

Stochastic cell transmission model (SCTM): A stochastic dynamic traffic model for traffic state surveillance and assignment

The paper proposes a first-order macroscopic stochastic dynamic traffic model, namely the stochastic cell transmission model (SCTM), to model traffic flow density on freeway segments with stochastic demand and supply. The SCTM consists of five operational modes corresponding to different congestion levels of the freeway segment. Each mode is formulated as a discrete time bilinear stochastic system. A set of probabilistic conditions is proposed to characterize the probability of occurrence of each mode. The overall effect of the five modes is estimated by the joint traffic density which is derived from the theory of finite mixture distribution. The SCTM captures not only the mean and standard deviation (SD) of density of the traffic flow, but also the propagation of SD over time and space. The SCTM is tested with a hypothetical freeway corridor simulation and an empirical study. The simulation results are compared against the means and SDs of traffic densities obtained from the Monte Carlo Simulation (MCS) of the modified cell transmission model (MCTM). An approximately two-miles freeway segment of Interstate 210 West (I-210W) in Los Ageles, Southern California, is chosen for the empirical study. Traffic data is obtained from the Performance Measurement System (PeMS). The stochastic parameters of the SCTM are calibrated against the flow-density empirical data of I-210W. Both the SCTM and the MCS of the MCTM are tested. A discussion of the computational efficiency and the accuracy issues of the two methods is provided based on the empirical results. Both the numerical simulation results and the empirical results confirm that the SCTM is capable of accurately estimating the means and SDs of the freeway densities as compared to the MCS.     

7000m3多用途乙烯运输船快速性研究

针对一艘多用途乙烯运输船的快速性优化研究,提出了船体线型优化的一些思路.适当增加船宽或吃水以降低方形系数;降低主机转速增大螺旋桨最佳直径;采用CFD软件做初步评估,通过船模试验做最终航速预报,并提出应注意纵倾变化对快速性的影响.