科创中国

针对当前交叉口信号灯模糊控制器结构参数固定的缺陷,提出了一种新的分级模糊控制器用于交叉路口交通流的控制与优化,该控制器能有效地减少规则数,易于提取模糊规则,能够显著改善交叉路口的通行能力.仿真实验结果证明该模型是有效的.

The existing research of the active suspension system(ASS) mainly focuses on the different evaluation indexes and control strategies. Among the different components, the nonlinear characteristics of practical systems and control are usually not considered for vehicle lateral dynamics. But the vehicle model has some shortages on tyre model with side-slip angle, road adhesion coefficient, vertical load and velocity. In this paper, the nonlinear dynamic model of lateral system is considered and also the adaptive neural network of tire is introduced. By nonlinear analysis methods, such as the bifurcation diagram and Lyapunov exponent, it has shown that the lateral dynamics exhibits complicated motions with the forward speed. Then, a fuzzy control method is applied to the lateral system aiming to convert chaos into periodic motion using the linear-state feedback of an available lateral force with changing tire load. Finally, the rapid control prototyping is built to conduct the real vehicle test. By comparison of time response diagram, phase portraits and Lyapunov exponents at different work conditions, the results on step input and S-shaped road indicate that the slip angle and yaw velocity of lateral dynamics enter into stable domain and the results of test are consistent to the simulation and verified the correctness of simulation. And the Lyapunov exponents of the closed-loop system are becoming from positive to negative. This research proposes a fuzzy control method which has sufficient suppress chaotic motions as an effective active suspension system.

对河北省石津灌区总千渠闸门控制系统构建的重要性和必要性进行了分析,针对灌区具体情况提出了闸控系统的设计原则,选择了主从结构、分布式实时监测方式,闸门的控制选择了现地控制、远程监测模式,可以实现多重控制手段来保证系统安全有效的运行.文章对系统进行了详细的总体设计,并分别阐述了现地监控站的结构组成、闸控系统应实现的功能和软件的性能、可实现功能等内容.总结了系统建设经验和今后系统运行维护时的重点,为同类型灌区提供了一定的经验和借鉴.

通过对三相异步电机功率因数控制器的工作原理分析,找出双向晶闸管的输出电压与其可控角之间的关系,提出了将功率因数控制器对晶闸管控制角控制计算转换为对时间控制的新控制算法.分析触发时间与输出电压之间的关系及触发方法,电机负载、功率因数与节能之间的关系,提出了功率因数控制器控制算法的两种控制方案,给出了控制算法程序框图,使单片机的软件设计实施方案更加方便.

Steering control of a capsule robot in curve environment by magnetic navigation is not yet solved completely.A petal-shaped capsule robot with less steering resistance based on multiple wedge effects is presented,and an optimization method with two processes for determining the orientation of a pre-applied universal magnetic spin vector is proposed.To realize quick and non-contact steering swimming,a fuzzy comprehensive evaluation method for optimizing the steering driving angle is presented based on two evaluation indexes including the average steering speed and the average steering trajectory deviation,achieving the initial optimal orientation of a universal magnetic spin vector.To further reduce robotic magnetic vibration,a main target method for optimizing its final orientation,which is used for fine adjustment,is employed under the constrains of the magnetic moments.Swimming experimental results in curve pipe verified the effectiveness of the optimization method,which can be effectively used to realize non-contact steering swimming of the petal-shaped robot and reduce its vibration.

以我国物流企业竞争力评价为总目标,建立相应的竞争力评价指标体系,通过运用层次分析法确定了各层次指标权重,在此基础上根据模糊综合评价方法实证评价了物流企业的竞争力,为物流企业合理配置资源和提高自身竞争力提供理论参考和有价值的思路.

煤炭运输网络优化设计的目标是使煤炭运输网络广义费用最小.研究的广义费用由运输费用、延误费用及其权重构成,通过分析煤炭运输网络流量分配目标,运用基于三角模糊数的模糊层次分析法得到各目标权重,进而确定各目标对总目标的贡献大小.

通过分析物流信息化的涵义,在遵循指标体系构建原则基础上设计物流信息化评价指标体系,将层次分析法与模糊综合评价法结合起来进行客观评价,并且巧妙运用Excel计算表进行求解.

在介绍物流企业及其文化竞争力建设的基础上,运用模糊矩阵分析法构建物流企业文化竞争力的评价指标体系,探讨我国物流企业文化竞争力建设的主要措施,以期为我国物流企业文化竞争力建设提供一定参考.

为提高石家庄市民心河水质预测的精度和实用性,对石家庄市民心河水样进行了检测,利用模糊综合评价法对水质污染现状进行了评价,得出民心河大部分水样监测点水质都在V类,部分指标超出了景观用水水质标准,河水受到污染.因此需要采取措施改善水环境质量.