一类基于模型预测的船舶自动舵控制策略研究

针对自动舵K-T模型的特点改进了传统的动态矩阵控制方法.改进后的方法避免了K-T模型截断误差的影响,能有效校正模型参数变动的影响,使之可用于船舶自动舵的控制.仿真结果证明了此改进方法的可行性.     

对空情报雷达探测威力试验飞行设计

在分析雷达威力探测试验条件和方法的基础上,对威力试验的航线及飞行架次进行了设计,研究了发现概率区间与飞行试验的观测次数关系及误差分析,以及发现概率区间与发现概率曲线关系;仿真实验表明,在距离区间内选择合适的观测次数和发现概率,对对空情报雷达威力试验有着直接影响。     

基于改进层次分析法的舰炮武器系统作战效能评估

舰炮武器系统作战效能评估是一个多目标评价过程,利用层次分析法可以对此非定量事件作定量分析,而一致性检验在层次分析法中是必不可少的。在实际评估中,一般都凭着大致的估计来调整判断矩阵使之满足一致性要求,这样具有很大的盲目性。利用最优传递矩阵的概念,对层次分析法进行改进,使之自然满足一致性要求,直接求出权重值。效能评价实例说明了基于最优传递矩阵的层次分析法的可行性和有效性。     

极坐标系下的航迹灰色区间关联算法

研究了雷达组网中时变系统偏差存在时的航迹关联问题。在分析时变偏差影响的基础上,从航迹的不确定区域着手,提出一种基于极坐标测量参数的航迹灰区域表示方法,并以此建立了区间灰数关联模型,实现了无需对系统误差配准的航迹关联配对。仿真结果表明,算法是有效的,并且具有较好的抗差性能。     

影响矩阵法在施桥大桥吊杆二次调索中的应用

在系杆拱桥施工过程中,为增大结构的安全储备并保证主梁受力安全,通常对吊杆采用两次张拉,最终达到设计成桥索力,由此提出二次调索施调索力、顺序的计算问题.以影响矩阵理论为基础,建立了二次调索最优控制的数学模型,采用惩罚函数法求解,该方法计算精确、简便、实用,也可用于成桥后索力的误差调整.     

车用电控柴油机润滑油更换里程研究

详细地介绍了车用电控柴油机润滑油更换里程的研究过程。研究结果表明:4.5 L和6.7 L车用电控柴油机使用推荐的CH4-15W/40润滑油时,在常用典型工作循环(城市工况、高速工况、国道工况)下,润滑油更换里程可以延长到20 000公里。     

Motorcycle suspension design using matrix inequalities and passivity constraints

This paper presents a design methodology for the suspension system of a novel aerodynamically efficient motorcycle. Since the machine’s layout and the rider’s seating position are unconventional, several aspects of the machine design, including the suspension, must be reviewed afresh. The design process is based on matrix inequalities that are used to optimise a road-grip objective function – others could be used equally well. The design problem is cast as the minimisation of an H ₂ cost with passivity constraints imposed on the suspension transference. The resulting bilinear matrix inequality problem is solved using a locally optimal iterative algorithm. The matrix inequality-type characterisation of positive real functions permits the optimisation of the suspension system over an entire class of passive admittances. Torsional springs, dampers and inerters are then used to construct networks corresponding to the optimal (positive real) admittances. Networks of first, second, third and fourth orders are considered, and an argument based on the compromise between complexity and improved grip is made for the most suitable suspension configuration. Finally, the effects of improved road grip on the stability of the vehicle’s lateral dynamics are analysed.     

交通网络中动态OD矩阵估计模型研究

动态起点-迄点（OD）矩阵为智能交通系统提供所需的基础数据。为了提高交通网络中动态OD矩阵估计的精度,在最小化路段实际交通量和分配交通量之间差值以及最小化历史OD矩阵和待估计OD矩阵之间差值的基础上,将浮动车采集信息融合到OD矩阵估计过程中;在动态网络加载过程中,OD矩阵估计值如果大于加载车辆数会使网络中的定点问题求解发散。为了避免该情况的发生,基于广义最小二乘模型并引入容量约束,提出1种带不等式约束的动态OD矩阵估计方法。仿真实验表明,该方法对于OD矩阵估计的精度较好,优于带滑动窗的广义最小二乘算法。     

How to assess sustainability of suppliers in volume discount context? A new data envelopment analysis approach

In this paper, we reformulate conventional data envelopment analysis (DEA) models and propose a novel method for evaluating sustainability of suppliers in the presence of interval volume discount offers, fuzzy data, and ordinal data. To this end, we convert all data into interval data. To convert fuzzy data into interval data, we use nearest weighted interval approximation by applying weighting function and we convert each ordinal data into interval one. Then, using enhanced Russell model, interval efficiencies are obtained. After that, using preference degree approach, we rank suppliers. Finally, a case study is presented to illustrate our proposed approach.     

复杂周期信号的等间隔序列分选

分析各种周期信号在直方图上的规律,提出一种等间隔序列方法来分选复杂周期信号,利用等间隔序列比原序列含有更丰富的周期信息,减小了直方图方法在复杂信号环境中判别信号周期的级数和复杂性,从而提高了分选"周期性信号"的速度.