严格排放法规背景下太阳能在船舶上的应用研究

为降低船舶排气污染物排放,促进水运行业绿色健康发展。通过利用太阳能光伏系统代替部分船舶辅机发电机向船舶货仓甲板照明系统供电,并根据船舶排气污染物实船测试要求,对太阳能在船舶上应用效果进行实船验证,污染物CO、NOX、HC总体呈下降趋势。随着太阳能光伏技术的进一步发展,太阳能的利用将是未来实现船舶绿色航行的关键措施之一。     

Research on the mechanism of a newly developed levitation frame with mid-set air spring

To reduce the vehicle/guideway-coupled vibration and improve the levitation stability of medium–low-speed maglev vehicle, a new type of levitation frame with air springs installed in the middle of the longitudinal beams is developed. This levitation frame with mid-set air spring (LFMAS) is studied comparatively with the levitation frame with end-set air spring (LFEAS) in electromagnetic levitation mode. The coupling degrees of the two kinds of frames are analysed by vertical motion equations; the energy consumptions for levitation control system to overcome the spring resistance in the whole adjustment process are calculated by the energy method; and the vibration accelerations are compared by dynamics analysis and bench test. The equations indicate that the LFMAS has a better decoupling effect and lower energy consumption than that of the LFEAS in any adjustment process. Simulation and test results show that the LFMAS can effectively reduce the vibration acceleration at a low-speed and achieve a better levitation stability in working conditions, validating that the LFMAS has a better levitation performance and adaptability to the guideway, which is attributed to the mechanical decoupling of the levitation module. It is expected that this new levitation frame will be very helpful in enhancing levitation stability and the ride index of medium–low-speed maglev vehicle.     

新时代四川内河水运发展思路及对策

在交通强国、双碳目标等国家战略，以及四川省“一干多支、五区协同”“四向拓展、全域开放”战略背景下，四川水运高质量发展面临着新的机遇和挑战，需要提出新思路、研究新对策、充分发掘自身潜力、提高供给质量和效率。在分析四川水运发展历程的基础上，总体评价四川省水运发展成就和存在问题，全面研判新时代内河水运发展面临的形势与要求，从发展模式、发展定位、发展格局、发展动能、发展业态等方面提出发展思路及对策，为推动四川内河水运高质量发展提供借鉴。     

GNSS测高法在控制测量中的研究

针对实际长距离控制测量中，传统水准测量费时费力、受地形影响大等问题，进行全球卫星导航系统(GNSS)测高法取代四等水准测量的可行性研究。依托某运河工程，以GNSS测高法所建控制网数据为基础，利用省级高精度似大地水准面高程模型对控制点进行正常高转换，求得控制点的1985国家高程结果，并与第三方水准结果进行对比，进而对GNSS测高法进行精度评定。结果表明，所依托工程中GNSS测高法可达到三、四等水准测量的精度；在四等水准测量精度要求下，可用GNSS测高法替代传统水准测量。     

基于EMB的纯电动汽车制动能量回收优化控制策略研究

为提高电动汽车制动时回收的能量,减少能源浪费,本文中提出了一种基于电子机械制动(EMB)系统的再生制动力分配策略。首先,根据制动踏板信号得到当前制动强度,结合前后轴制动力分配策略分别得到前轴、后轴制动力。然后以车速、电池SOC值和制动踏板行程为输入,再生制动占比为输出,创建模糊控制器,且以制动时回收能量最大化为优化目标,运用PSO算法优化模糊控制器。最后进行Simulink和AVL Cruise的联合仿真。结果表明,在NEDC工况下能量回收提升2.5%,在CLTC-P工况下能量回收提升1.56%。