为研究汽车加速-滑行(pulse and gliding,PnG)运行状态的能耗特性,以汽车PnG和匀速运行状态行驶相同的距离为条件,定义了PnG运动状态下的瞬态节能量ΔQ(t)、单位里程节能量Δq s(t)和节能率η等能耗相关特性指标;在不同期望速度、加速...为研究汽车加速-滑行(pulse and gliding,PnG)运行状态的能耗特性,以汽车PnG和匀速运行状态行驶相同的距离为条件,定义了PnG运动状态下的瞬态节能量ΔQ(t)、单位里程节能量Δq s(t)和节能率η等能耗相关特性指标;在不同期望速度、加速度以及速度波动幅度等运动状态参数下,利用MATLAB对周期对称性、非对称性速度调控方式下的能耗指标进行仿真分析。结果表明:在不同设定下,能耗指标随运动状态参数的变化规律不同。在相同的期望车速下,试验测得的平均瞬态最大节油率(37.30%)小于理论分析的平均瞬态最大节能率(40.54%),因此通过车辆运动状态控制产生的节能效果,还需要以车辆动力装置的能量转化效率的提升以及通过传动系统优化匹配工作点或范围来保障。上述研究结果为通过控制车辆运动状态实现节能运行提供理论依据,并对汽车节能驾驶实践提供指导。展开更多
We evaluated sliding acceleration of a water droplet on a silicon surface treated with octadecyltrichlorosilane by changing the droplet weight. The slope of the sliding acceleration against the droplet weight was chan...We evaluated sliding acceleration of a water droplet on a silicon surface treated with octadecyltrichlorosilane by changing the droplet weight. The slope of the sliding acceleration against the droplet weight was changed at 20 mg, suggesting that the dominant sliding mode was shifted from slipping to rolling. Water droplets elongated and contracted during sliding when silicon surface was treated by fluoroalkylsilane. The elongation inversely corresponded to the change of sliding acceleration.展开更多
文摘为研究汽车加速-滑行(pulse and gliding,PnG)运行状态的能耗特性,以汽车PnG和匀速运行状态行驶相同的距离为条件,定义了PnG运动状态下的瞬态节能量ΔQ(t)、单位里程节能量Δq s(t)和节能率η等能耗相关特性指标;在不同期望速度、加速度以及速度波动幅度等运动状态参数下,利用MATLAB对周期对称性、非对称性速度调控方式下的能耗指标进行仿真分析。结果表明:在不同设定下,能耗指标随运动状态参数的变化规律不同。在相同的期望车速下,试验测得的平均瞬态最大节油率(37.30%)小于理论分析的平均瞬态最大节能率(40.54%),因此通过车辆运动状态控制产生的节能效果,还需要以车辆动力装置的能量转化效率的提升以及通过传动系统优化匹配工作点或范围来保障。上述研究结果为通过控制车辆运动状态实现节能运行提供理论依据,并对汽车节能驾驶实践提供指导。
文摘We evaluated sliding acceleration of a water droplet on a silicon surface treated with octadecyltrichlorosilane by changing the droplet weight. The slope of the sliding acceleration against the droplet weight was changed at 20 mg, suggesting that the dominant sliding mode was shifted from slipping to rolling. Water droplets elongated and contracted during sliding when silicon surface was treated by fluoroalkylsilane. The elongation inversely corresponded to the change of sliding acceleration.
