Fuzzy and adaptive fuzzy control for the automobiles’ active suspension system

Two typical criteria for good vehicle suspension performance are their ability to provide good road handling and increased passenger comfort. The main disturbance affecting these two criteria is terrain irregularities. Active suspension control systems reduce these undesirable effects by isolating car body motion from vibrations at the wheels. This paper describes fuzzy and adaptive fuzzy control (AFC) schemes for the automobile active suspension system (ASS). The design objective is to provide smooth vertical motion so as to achieve the road holding and riding comfort over a wide range of road profiles. The efficacy of the proposed control schemes is demonstrated via simulations. With respect to the optimal linear quadratic regulator (LQR), it is shown that superior results have been achieved by the AFC.     

基于自适应粒子群算法的隧道窑温度模糊控制策略

针对隧道窑燃烧过程中的大惯性、纯滞后、多变量、时变参数以及工作机理复杂等特征,利用清晰集构造模糊集法确定模糊控制器输入量和输出量的隶属函数,并基于自适应粒子群算法给出了隧道窑新的温度模糊控制策略。运用模糊控制系统对隧道窑温度进行仿真研究和实时控制,结果表明,该模糊控制器能够克服许多干扰因素,具有良好的控制效果。     

制造、维修质量的有效评估

结合减速顶的生产、维修实际，分析基于模糊综合评价理论进行减速顶的制造、维修质量评估的必要性，同时建立模糊评价的数学模型，并对实例进行模型设计和计算，为减速顶生产、运用、维修质量评估提供一条新思路。     

基于可信性理论的电气化铁路接触网可靠性的模糊评估

首先基于故障树分析法建立了接触网系统的可靠性模型,在大量调研和统计分析的基础上,用梯形模糊变量描述接触线、承力索和绝缘子的故障率和修复率,用三角形模糊变量描述接触网其他部件的故障率和修复率,将接触网系统的故障率、修复率和可用度等可靠性指标视为随机模糊函数,利用可信度理论实现了接触网可靠性的模糊评估。计算结果表明,只要掌握各部件故障率和修复率的大致分布,就可以较准确地计算接触网系统的可靠性指标,误差满足工程精度的要求。     

基于ECDIS的航线评估技术研究

通过对ECDIS航线设计功能的分析,结合舰船海上航行的相关要求和GIS的现有技术,研究了基于ECDIS的航线评估技术,建立了航线评估适用模型,为扩充电子海图系统的空间分析功能,挖掘海洋空间数据中的隐含信息,实现GIS在航海领域中的应用提供了技术支持。     

船舶航向模糊控制系统的设计

提出了一种改进的船舶航向模糊控制方法,将航向改变模糊控制器和航向保持模糊控制器有机地结合起来,同时在航向保持模糊控制器的输出端叠加了一个积分作用,提高了航向保持过程中的静态精度。仿真结果表明,无论是在静水环境中还是在不同风和流干扰的环境中,这种改进的航向模糊控制器都比常规的模糊控制器具有更好的控制效果,能够满足船舶航向实时控制的要求。     

A novel fuzzy logic correctional algorithm for traction control systems on uneven low-friction road conditions

The traction control system (TCS) might prevent excessive skid of the driving wheels so as to enhance the driving performance and direction stability of the vehicle. But if driven on an uneven low-friction road, the vehicle body often vibrates severely due to the drastic fluctuations of driving wheels, and then the vehicle comfort might be reduced greatly. The vibrations could be hardly removed with traditional drive-slip control logic of the TCS. In this paper, a novel fuzzy logic controller has been brought forward, in which the vibration signals of the driving wheels are adopted as new controlled variables, and then the engine torque and the active brake pressure might be coordinately re-adjusted besides the basic logic of a traditional TCS. In the proposed controller, an adjustable engine torque and pressure compensation loop are adopted to constrain the drastic vehicle vibration. Thus, the wheel driving slips and the vibration degrees might be adjusted synchronously and effectively. The simulation results and the real vehicle tests validated that the proposed algorithm is effective and adaptable for a complicated uneven low-friction road.     

Cost-time Minimization in a Transportation Problem with Fuzzy Parameters: A Case Study

In real world applications the supply, the demand and the transportation cost per unit of the quantities in a transportation problem are hardly specified precisely because of the changing economic and environmental conditions. It is also important that the time required for transportation should be minimum. In this paper a method has been proposed for the minimization of transportation cost as well as time of transportation when the demand, supply and transportation cost per unit of the quantities are fuzzy. The problem is modeled as multi objective linear programming problem with imprecise parameters. Fuzzy parametric programming has been used to handle impreciseness and the resulting multi objective problem has been solved by prioritized goal programming approach. A case study has been made using the proposed approach.     

全自动泊车系统的模型设计与仿真

全球汽车保有量的增多,直接造成城市交通的拥堵以及停车位空间的减小。随之而来的就是泊车安全性问题,新手驾驶员或疲劳驾驶人员如何能在不发生碰撞的情况下,快速安全地泊车入库,成为当下研究的热点。针对以上问题,本文将对全自动泊车系统展开研究。基于B样条曲线设计出泊车路径,基于滑模变结构与预瞄方式进行泊车路径的跟踪。最后通过搭建SIMULINK与CARSIM仿真模型进行联合仿真。     

基于模糊综合函数的飞行计划与雷达航迹关联

文章针对飞行计划航迹准确推算的困难和传统飞行计划关联算法的缺陷,利用飞行计划、起飞报、位置报等报文较为准确的推算出计划航迹,并根据关联特点,运用模糊综合函数航迹关联算法的思想,建立了仿真模型,解决了关联问题。仿真结果验证了该算法的科学性、可行性。