高精度少齿差减速器的传动回差精度控制

传动回差是高精度少齿差减速器一项重要精度指标，本文通过结构工艺分析，介绍了影响传动回差的一般因素和主要因素，提出了要保证包括偏心轴误差、齿轮误差、轴承误差在内的综合齿轮侧隙的概念，着重研究了不同工艺方案对传动回差控制的具体影响，并对高精度少齿差减速器研制工艺方案、工艺要点及装配调整作了较为详细的介绍。     

某护卫舰性能预报和模型——实船试验相关分析

给出了某护卫舰实船测速中６个工况的实测数据，简要介绍了德国汉堡水池（ＨＳＶＡ）对高速水面舰实船性能预报与我国常用方法的不同之处。对中国船舶科学研究中心（ＣＳＳＲＣ）的模型试验数据，按我国高速水面舰常用的预防方法及局部改进的方法进行了计算，并与实测值作了比较。对本舰在ＨＳＶＡ和ＣＳＳＲＣ所得的模型试验数据，分别与实船试验数据进行了相关分析，给出了分析结果，并对有关的一些问题作了探讨。     

双体滑行艇主尺度,线型和槽道参数对快速性的影响

本文根据高性能双体滑行系列试验资料和三种八型实艇设计经验，分析了双体滑行艇主尺度和槽道参数对快速性的影响。     

利用Hough变换和稳健估计计算道路线形参数

道路线形参数计算对于公路现状调查、道路优化设计、道路信息管理、安全分析和建立公路的三维空间模型均具有重要意义。根据道路线形的特点,利用基于Hough变换的直线和圆曲线提取算法对数据进行分组,然后利用稳健估计对数据进行迭代平差,计算出道路各段线形参数,从而实现道路线形识别的目的。算法由Visual C 语言实现,在实践中证明是很有效的。     

汽车车速信号采集与传输的方法

随着汽车电子化程度越来越高,车速信号应用的范围也越来越广泛。通过特定的传感器产生与汽车车轮的转数成正比的脉冲信号,在汽车内部ECU中,通过一定的公式计算采集到的脉冲数,来反算出车速。车速信号被广泛的应用于导航系统、车道偏离系统、自适应巡航系统中,汽车车速的准确与否直接关系到汽车安全及可靠性。     

单体双气垫登陆艇概念设计研究

针对一型登陆艇完成了单体双气垫船的概念设计,对单体双气垫船的设计方法进行了探讨,提出单体双气垫船的设计应分为船体主尺度要素设计以及气垫尺寸和布局设计,设计结果显示单体双气垫船型方案具有较好的军事价值,在快速性、登退滩性能和生存能力方面效果较好。     

Improved Speed Estimation From Single-Loop Detectors With High Truck Flow

Single-loop detectors are the most common sensors employed by freeway traffic management agencies. The data are used for traffic management and traveler information. Single-loop detectors can only measure flow and occupancy. Although speed is often the most useful metric, it can only be estimated at conventional single-loop detectors. Typically this estimate comes from the quotient of flow and occupancy multiplied by the fixed, assumed average effective vehicle length. This conventional approach is limited because the actual average effective vehicle length will vary from sample to sample. Many researchers have proposed alternatives to address this problem, and although many of the methods work well under normal conditions, there has been limited research into methods that yield reliable estimates under heavy truck traffic. Heavy truck flows may arise as a function of location or time of day, for example, with proximity to a trucking facility or in early mornings when the number of passenger vehicles drops, respectively. This article presents a new methodology to estimate speed from single-loop detectors in conditions where trucks comprise a large percentage of the fleet. While the focus is on single loop detectors, the work is equally applicable to side-fire microwave radar detectors that emulate single-loop detectors.     

Short-Term Highway Traffic State Prediction Using Structural State Space Models

This research proposes a short-term highway traffic state prediction method based on a structural state space model, with the intention to provide a robust approach for obtaining accurate forecasts of traffic state under both recurring and non-recurring conditions. True traffic state is decomposed to three components, namely, regular traffic pattern, structural deviation, and random fluctuation. Particularly, the structural deviation term reflects the change of true traffic state from regular (historical) pattern, due to unexpected capacity reduction and/or demand variations. A polynomial trend is adopted to describe the temporal evolution of structural deviations across different time intervals. We derive an analytical form of structural deviations in a single bottleneck case based on cumulative flow count diagrams. The proposed model is incorporated in a Kalman filtering-based algorithmic framework, together with an adaptive scheme for determining the variances of random errors. A set of numerical experiments was conducted on two test beds in the northern Taiwan highway network. Experimental results show that the proposed approach is particularly superior to an ordinary Kalman filtering method presented in the literature under non-recurring conditions, highlighting the advantage of combining both the polynomial trend model and historical pattern into the proposed short-term traffic state prediction approach.     

车速控制系统自适应油门控制器设计

在分析非线性车辆纵向动力学模型及简化模型基础上，采用一种简化非线件模型设计自适应油门控制器，并应用李亚谱诺夫理论证明了传动系统存在动态过程时控制系统的稳定性。通过对基于简化线性和非线性模燃的自适应控制器的仿真研究，结果表明后者具有更好的收敛性。试验结果也进一步表明，基于非线性模型的自适应控制器可以通过自适应调节减小参数不确定造成的干扰，当传动系统存在动态过程时可以保证车速跟踪误差有界。