模糊逻辑诊断技术在汽油机故障诊断中的应用

根据汽油机故障征兆与故障原因之间并非一一对应的不确定关系特点,有针对性地提出了模糊逻辑诊断原理,给出了利用模糊逻辑诊断技术对汽油机故障进行分析诊断的方法,通过实例说明了模糊逻辑诊断技术在汽油机故障诊断中的应用．     

整周模糊度改进算法研究与实现

介绍了在短基线状态下利用单频单历元双差载波相位定位时模糊度固定的基本理论.结合正则化理论和阻尼矩阵的思想,提出了一种用改进的正则化方程来改善法方程病态性的方法.算例分析表明,应用改进的正则化算法可以改善法矩阵的病态性,得到更加精确的浮动解,利用LAMBAD方法搜索可得到准确的整周模糊度解.     

Designing H∞/GH 2 static-output feedback controller for vehicle suspensions using linear matrix inequalities and genetic algorithms

This paper presents an approach to design the H_∞/GH ₂ static-output feedback controller for vehicle suspensions by using linear matrix inequalities (LMIs) and genetic algorithms (GAs). Three main performance requirements for an advanced vehicle suspension are considered in this paper. Among these requirements, the ride-comfort performance is optimized by minimizing the H_∞ norm of the transfer function from the road disturbance to the sprung mass acceleration, while the road-holding performance and the suspension deflection limitation are guaranteed by constraining the generalized H₂ (GH ₂) norms of the transfer functions from the road disturbance to the dynamic tyre load and the suspension deflection to be less than their hard limits, respectively. At the same time, the controller saturation problem is considered by constraining its peak response output to be less than a given limit using the GH ₂ norm as well. A four-degree-of-freedom half-car model with active suspension system is applied in this paper. Several kinds of H_∞/GH ₂ static-output feedback controllers, which use the available sprung mass velocities or the suspension deflections as feedback signals, are obtained by using the GAs to search for the possible control gain matrices and then resolving the LMIs together with the minimization optimization problem. These designed H_∞/GH ₂ static-output feedback controllers are validated by numerical simulations on both the bump and the random road responses which show that the designed H_∞/GH ₂ static-output feedback controllers can achieve similar or even better active suspension performances compared with the state-feedback control case in spite of their simplicities.     

醛固酮及螺内酯对肝星状细胞中TIMP-1和MMP-2mRNA表达的影响

目的观察醛固酮及螺内酯对活化的肝星状细胞(HSC-T6)作用后不同时间段MMP-2和TI MP-1 mRNA的表达情况。方法采用RT-PCR的方法测定HSC-T6中MMP-2、TI MP-1 mRNA的表达。结果活化的HSC可表达MMP-2及TI MP-1的mRNA。醛固酮组MMP-2、TI MP-1的mRNA在48、72 h表达均高于对照组,在作用24、48、72 h时MMP-2、TI MP-1的mRNA的表达随时间递增。而螺内酯组则相反。醛固酮加螺内酯组与单加醛固酮组相比MMP-2、TI MP-1的mRNA表达下降。结论醛固酮可能通过促使MMP-2及TI MP-1 mRNA的表达促纤维化,螺内酯可抑制这一作用。     

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根据时变的OD预测信息,基于分层递阶的思想,建立了一个新颖的高速公路优化控制系统。控制结构分为三层：网络负荷分配层对长时期内总的交通需求进行预测,提前确定将来排队长度的上界;全局最优控制层预测未来的交通状态,为路网中的各个匝道建立协调约束;局部反馈控制层根据实测的交通条件及全局最优控制层的寻优结果决定匝道调节率。仿真结果表明,控制系统具有良好的动态性能,协调了各个匝道之间的利益,实现了高速路网整体性能的优化。     

9 000 hp拖船总振动的计算与试验研究

简要介绍了9000hp拖船总体振动的计算方法,并采用锚激发对船体的总振动进行试验研究。试验结果表明利用迁移矩阵法计算得到的压载出港条件下全船的振动结果与试验结果差距不大。     

Essential elements in tactical planning models for container liner shipping

Tactical planning models for liner shipping problems such as network design and fleet deployment usually minimize the total cost or maximize the total profit subject to constraints including ship availability, service frequency, ship capacity, and transshipment. Most models in the literature do not consider slot-purchasing, multi-type containers, empty container repositioning, or ship repositioning, and they formulate the numbers of containers to transport as continuous variables. This paper develops a mixed-integer linear programming model that captures all these elements. It further examines from the theoretical point of view the additional computational burden introduced by incorporating these elements in the planning model. Extensive numerical experiments are conducted to evaluate the effects of the elements on tactical planning decisions. Results demonstrate that slot-purchasing and empty container repositioning have the largest impact on tactical planning decisions and relaxing the numbers of containers as continuous variables has little impact on the decisions.     

复合式康复机械手设计

为满足手臂运动功能障碍患者的康复需要,设计了一种复合式康复机械手.介绍了它的机械结构、工作原理和三种控制方式及根据D-H方法得出的康复机械手位姿的齐次变换矩阵.该康复机械手既可单独实现小臂、手掌的曲张运动又可实现小臂、手掌的联动；通过样机试验,验证了该康复机械手的基本功能,可为手臂运动功能障碍患者提供有效的康复训练.     

消失模液锻中气隙压力和气流速度的计算分析

通过计算分析了消失模液锻制备颗粒增强金属基复合材料中，附带的增强颗粒泡沫载体与金属液作用后产生的气隙压力和气流速度，然后在消失模液锻TiC／ZG270-500实验中测量气隙压力和气流速度值，并探讨液锻工艺参数对气隙压力和气流速度的影响规律．实验结果表明：气隙压力和气流速度随充型速度、浇注温度、内浇口与排气孔横截面积比呈递增趋势，但均不随成形压力变化．此外，气流速度还随排气孔与型腔横截面积比增大而增大，气流速度随工艺参数变化趋势较平缓．     

矩阵变换器技术及其应用研究

阐述了多年来对矩阵变换器技术及其应用进行研究的认识和体会,总结了在矩阵变换器调制技术、矩阵变换器系统优化设计、矩阵变换器系统建模和控制设计等方面的研究成果,10kW双级矩阵变换器系统反复试验和测试的结果表明,双级矩阵变换器的工业应用指日可待。