共查询到20条相似文献，搜索用时 31 毫秒
1.
随着我国经济的高速发展以及机动化、城市化的加快,交通能源的消耗量不断增加,特别是近些年各地政府公务车采购数量每年都以超过20%的速度增长,再加上我国公务车数量基数大、排量大、利用率非常高,使得公务车能耗对交通能耗的贡献率不断递增,因此从战略的角度并结合公务车的出行特征来分析,公务车有很大的节能空间,是交通节能的"黑大陆".本文从系统的观点出发,通过分析导致公务车高能耗的原因,提出降低公务车能耗,实现公务车节能的战略措施. 相似文献
2.
新能源汽车的研发与应用作为应对能源危机和环境污染的有效手段已受到全球各国的关注,但与传统燃料汽车相比,新能源汽车的关键技术及基础件研发水平有待进一步提高,相关政策不够完善,配套设备还不够健全。在分析陕西新能源汽车的生产和推广应用现状基础上,结合陕西省新能源汽车产业基础、区域经济特征和国家战略规划等关键要素,给出陕西省新能源汽车商业推广的3种创新模式并提出具体保障措施,为陕西新能源汽车的发展提供参考。 相似文献
3.
本文阐述了发展新能源汽车的必要性,并剖析了我国新能源汽车的发展现撒。最后,提出了转变发展方式促进新能源汽车发展的建议和举措。 相似文献
4.
5.
中国新能源汽车尤其是电动汽车的快速发展引致铜资源需求快速增长,资源需求和产业链风险不断增大,亟需通过有效的循环利用策略降低对原生资源的需求压力,提升新能源汽车产业链的弹性和可持续性。本文基于中国新能源汽车发展规划,构建了铜资源—零部件—新能源汽车的分层级动态物质流模型,评估循环利用策略有效性,分析中国新能源汽车发展对铜资源的影响。研究表明：①新能源汽车中纯电动汽车是实现铜循环利用的主力,再生铜资源对资源供给总量的乘数效应逐渐显现;②电机和电池是实现新能源汽车中铜资源循环利用的关键零部件,再生铜循环利用水平不断提升;③实施单一循环利用策略的有效性有限,需要通过执行复合策略,在减少原生铜消费的同时,增加再生铜供给,降低铜废料产出。为了发挥再生资源正外部性对资源可持续发展的促进作用,推动原生铜消费与资源需求总量脱钩,需要铜产业、新能源汽车产业、报废汽车回收拆解产业、消费者及政府之间的多主体协同合作,推动中国新能源汽车中铜资源循环利用策略的有效实现。 相似文献
6.
通过定量分析探究财政货币政策联动对我国新能源汽车消费的影响,结果发现,财政支持政策、货币支持政策对新能源汽车消费扩张均具有显著的积极效果,然而市场化因素对我国新能源汽车消费的影响却不十分显著。由此认为,扶持新能源汽车等战略性新兴产业,不仅需要财政政策与货币政策联动,而且还需要中央政府与地方政府联动;既需要市场与政策双向驱动,又需要在供给侧和消费侧同时发力,并以此提出简要政策建议。 相似文献
7.
8.
9.
Vehicles of different sizes are difficult to navigate in close vicinity. In this paper, we propose multi-vehicle coordination strategy by stochastic control and time scheduling to guarantee no collisions. We use contours and relative motions of vehicles to calculate collision time and use it in multi-vehicle scheduling and reduce computation burden. The proposed strategy enables the vehicles to add calculation delay when vehicles are moving towards the destinations. To avoid complicated control rule design for motion-restricted irregular vehicles, we propose stochastic control to provide satisfactory performance. By changing the frequency of control update, a modification is proposed to take congestion into account. Simulation examples are given to demonstrate the effectiveness of the proposed approach. 相似文献
10.
11.
在城市推广电动汽车具有明显的经济、社会和环境效益。由于消费者的里程误解、用车不够便捷、消费者的质量顾虑、区域的政策壁垒、电动汽车的负外部性等因素,以致于电动汽车推广效果不尽如人意。建议采取加大对电动汽车的传播力度,调整汽车市场需求结构,完善公共服务体系,鼓励产业链上下游的广泛参与,支持关键技术研发等措施,培育城市电动汽车市场。 相似文献
12.
本文分析了现代城市交通信号灯控制与管理的不合理性,进而提出一款更具人性化、智能化的城市交通灯控制系统的软硬件电路设计方案.该方案突破了传统固定时间模式,能根据车流量大小自动调节车辆通行时间,并考虑特殊车辆设置了紧急通道转换开关.最后通过PROTEUS仿真说明了系统制作过程与调试结果. 相似文献
13.
14.
《Journal of The Franklin Institute》2022,359(7):2886-2905
This paper investigates an observer-based sliding mode control (SMC)) for connected vehicles under denial-of-service attacks. The attacks refer to interrupting communication channels between vehicles. Firstly, a reduced order observer is used to estimate the relative acceleration between neighbor vehicles, and a switching communication topology is introduced to model the attack. Then, an observer based sliding mode controller is proposed to achieve desired stability performance. Moreover, a quadratic cost performance is also defined and the cost upper bound is proved. Some sufficient conditions are provided such that the connected vehicles can achieve robust tracking performance, and input-to-state string stability is guaranteed under zero initial errors. Finally, numerical simulations are given to illustrate the validity of the designed controller. 相似文献
15.
《Journal of The Franklin Institute》2019,356(8):4554-4576
This paper analyses collective motion of multi-vehicle systems in balanced or splay formation when the vehicles are equipped with heterogeneous controller gains. Balancing refers to a situation in which the positional centroid of the vehicles is stationary. The splay formation is a special case of balancing in which the vehicles are spatially distributed with equal angular separation between them. The paper proposes strategies to achieve such balanced and splay formations about a desired centroid location while allowing the vehicles to move either along straight line paths or on individual circular orbits. Feedback control laws that can tolerate heterogeneity in the controller gains, which may be caused by imperfect implementation, are derived and analyzed. It is shown that drastic failures leading to controller gains becoming zero for almost half of the vehicles in the group can be tolerated and balanced formation can still be achieved. On the other hand, splay formation can still be achieved if the controller gain is zero for at most one vehicle. Simulation examples are given to illustrate the theoretical findings. 相似文献
16.
基于国内对汽车车内噪声控制标准的提升，运用目前国内外对噪声主动控制方面的研究成果，结合汽车自身特点，阐述了利用压电陶瓷对车内噪声进行主动控制的研究；并根据车内声学模态对压电陶瓷优化配置方法和基于智能模糊的控制策略进行探讨，最后通过对轿车车内噪声控制试验验证这种主动控制方法。 相似文献
17.
构造一个以不同类型车辆数量为网络流、面向所服务的"生产商-零售商"两层级车辆资源合作超网络结构,建立各物流企业同时满足运营利润最高和碳排放量最低的多目标优化模型,利用变分不等式理论求解整个超网络达到最优均衡状态时的车辆配置方案。以A和B为例,对两整车物流企业选择车辆资源合作的共同配送模式进行可行性分析,通过数值仿真讨论碳税、车辆合作使用率等参数对物流企业车辆合作优化决策的重要影响。 相似文献
18.
We address a capacitated vehicle routing problem (CVRP) in which the demand of a node can be split on several vehicles celled split services by assuming heterogeneous fixed fleet. The objective is to minimize the fleet cost and total distance traveled. The fleet cost is dependent on the number of vehicles used and the total unused capacity. In most practical cases, especially in urban transportation, several vehicles transiting on a demand point occurs. Thus, the split services can aid to minimize the number of used vehicles by maximizing the capacity utilization. This paper presents a mix-integer linear model of a CVRP with split services and heterogeneous fleet. This model is then solved by using a simulated annealing (SA) method. Our analysis suggests that the proposed model enables users to establish routes to serve all given customers using the minimum number of vehicles and maximum capacity. Our proposed method can also find very good solutions in a reasonable amount of time. To illustrate these solutions further, a number of test problems in small and large sizes are solved and computational results are reported in the paper. 相似文献
19.
为把握全球水下潜器领域的研发前沿、国家布局及其未来研发方向,基于水下潜器领域SCI论文和发明专利数据,采用引文网络和专利地图方法,通过定义引文网络中的高被引论文、高频词、高被引新词以及专利地图中的重要专利、高频概念词等指标,综合专家意见,对水下潜器领域基础研究前沿和技术开发前沿进行识别;同时,基于引文网络中的论文总被引次数和重要专利总被引次数,对比分析主要国家在水下潜器领域的研发布局。结果显示：全球水下潜器领域研发处于活跃状态,其中无人自治式潜水器（AUV）方向一直保持较高的热度,相关研究起步早且发文体量大、增速最快;无人潜器应用研究方面的文献被引用量高、参与单位多、发表期刊水平高;AUV布放回收、通用技术、载荷以及无人遥控潜水器在油气业的应用等方向影响力最大;中国相关研发活跃、产出丰富,但缺乏相关技术的理论研究,产品市场竞争力较弱。 相似文献
20.
本文根据研究团队的相关预研究,结合主题词、德温特手工代码、IPC分类号等方法,精心制定新能源汽车技术的检索策略,在德温特专利数据库平台上收集数据,对检索结果使用TDA软件进行分析,在此基础上对国际新能源汽车领域专利从年度专利走势、主要技术领域、竞争机构专利分析等维度进行了统计和对比分析。结果显示,全球范围内新能源专利一直在稳定增长,国外在专利布局方面都没有忽视在中国市场的专利申请,企业之间的合作关系不强。 相似文献