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。     

Intelligent VIV control of 2DOF sprung cylinder in laminar shear-thinning and shear-thickening cross-flow based on self-tuning fuzzy PID algorithm

A self-tuning fuzzy PID (ST-FPID) control scheme is implemented within a joint interactive (Matlab/Simulink/Fluent) co-simulation framework for effective two degrees of freedom (2DOF) vortex-induced vibration (VIV) control of an elastically-mounted circular cylinder in laminar cross-flow of incompressible non-Newtonian power-law fluids based on the control action of a single transverse force actuator. The model-free controller, which systematically tunes the control parameters online in real time based on given rules, is well-known to be highly advantageous over the previously employed conventional PID controllers. It is particularly capable of handling the intricate non-linear dynamic effects inherent in the complex fluid rheology of non-Newtonian flow past the cylinder in presence of unmodeled system dynamics, high parametric uncertainties, diverse operational conditions, and time-varying external disturbances and control signals. Extensive numerical simulations reveal that the complex shear-thinning and shear-thickening behaviors of fluid viscosity can substantially influence the cylinder dynamic response, applied hydrodynamic forces, and flow structure. In particular, effectiveness and high performance of the adopted ST-FPID control strategy in substantial suppression of the high amplitude coupled 2DOF VIV of the elastically-mounted cylinder at selected critical reduced velocities in the lock-in region are established for a wide range of power-law index parameters (e.g., up to 83% reduction in RMS value of cylinder cross-flow displacement and up to 35% reduction in RMS value of cylinder in-line displacement for n=1and U* = 5 at Re = 100). Also, the vigorous action of the error-driven ST-FPID controller in forcing the high strength vortex shedding patterns of the uncontrolled cylinder out of the lock-in condition into the classical von Kármán vortex street of 2S-type mode of moderately weaker strengths is verified.     

考虑环境负效应的智能垃圾桶动态收运路径优化问题

随着智慧城市建设进程的推进，作为智慧城市建设基础配套设施的智能垃圾桶日益普及，其内置的监测传导装置可实时传输待清运垃圾量的相关数据，有助于解决城市生活垃圾产生量随机性导致的环境负效应以及收运系统效率低下的问题。本文基于智能垃圾桶提出一种城市生活垃圾动态收运路径优化策略。首先，考虑收运车辆延迟到达导致垃圾溢出的环境负效应，建立以最小化收运总成本为目标的垃圾收运车辆路径预优化模型和动态优化模型。其次，采用粒子群算法预优化收运路径，得到初始车辆清运方案；而后基于待清运垃圾量实时数据，设计周期性与连续性结合的策略，并构建触发连续性优化的启发式规则以实时优化车辆路径。不同规模的标准算例实验和仿真算例实验结果表明，周期性与连续性结合的优化策略在总成本、惩罚成本和距离指标上均优于周期性优化策略，且在惩罚成本指标上的改进最为显著。研究结果有助于降低由于清运不及时造成的环境负效应，为垃圾收运企业制定合理高效的清运方案提供了理论依据。