To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetra...To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetrain. The shift schedule can keep the torque converter working in the high efficiency range under all the working conditions except in the low efficiency range on the left when the transmission worked at the lowest shift, and in the low efficiency range on the right when the transmission worked at the highest shift. The shift quality key factors were analysed. The automatic trans-mission's bench-test adopting this shift schedule was made on the automatic transmission's test-bed. The experimental results showed that the shift schedule was correct and that the shift quality was controllable.展开更多
This paper considers a time-constrained data collection problem from a network of ground sensors located on uneven terrain by an Unmanned Aerial Vehicle(UAV),a typical Unmanned Aerial System(UAS).The ground sensors ha...This paper considers a time-constrained data collection problem from a network of ground sensors located on uneven terrain by an Unmanned Aerial Vehicle(UAV),a typical Unmanned Aerial System(UAS).The ground sensors harvest renewable energy and are equipped with batteries and data buffers.The ground sensor model takes into account sensor data buffer and battery limitations.An asymptotically globally optimal method of joint UAV 3D trajectory optimization and data transmission schedule is developed.The developed method maximizes the amount of data transmitted to the UAV without losses and too long delays and minimizes the propulsion energy of the UAV.The developed algorithm of optimal trajectory optimization and transmission scheduling is based on dynamic programming.Computer simulations demonstrate the effectiveness of the proposed algorithm.展开更多
In this paper,the case of a battery charger for electric vehicles based on a wireless power transmission is addressed.The specificity of every stage of the overall system is presented.Based on calculated and measured ...In this paper,the case of a battery charger for electric vehicles based on a wireless power transmission is addressed.The specificity of every stage of the overall system is presented.Based on calculated and measured results,relevant capacitive compensations of the transformer and models are suggested and discussed in order to best match the operating mode and aiming at simplifying as much as possible the control and the electronics of the charger.展开更多
The wireless communication system's performance is greatly constrained by the wireless channel characteristics,especially in some specific environment.Therefore,signal transmission will be greatly impacted even if...The wireless communication system's performance is greatly constrained by the wireless channel characteristics,especially in some specific environment.Therefore,signal transmission will be greatly impacted even if not in a complicated topography.Testing results show that it is hardly to characterize the radio propagation properties for the antenna installed on the ground.In order to ensure a successful communication,the radio frequency(RF)wireless signal intensity monitor system was designed.We can get the wireless link transmission loss through measuring signal strength from received node.The test shows that the near-ground wireless signal propagation characteristics still can be characterized by the log distance propagation loss model.These results will conduce to studying the transmission characteristic of Near-Earth wireless signals and will predict the coverage of the earth's surface wireless sensor network.展开更多
设计了一款轻便小巧的水质监测无人船,结合一体化水质监测电控系统进行水质温度、溶解氧质量浓度、氨氮质量浓度、pH的监测。硬件部分采用模块化结构设计,以Raspberry Pi 3B+作为主控模块,协同运行电源管理模块、数据采集模块、导航定...设计了一款轻便小巧的水质监测无人船,结合一体化水质监测电控系统进行水质温度、溶解氧质量浓度、氨氮质量浓度、pH的监测。硬件部分采用模块化结构设计,以Raspberry Pi 3B+作为主控模块,协同运行电源管理模块、数据采集模块、导航定位模块、避障模块、视觉采集模块、电机驱动模块、无线通信模块及岸基上位机。软件设计包括主程序、自主航行模式程序、遥控航行模式程序及无线通信模块程序的设计。将无人船放在城市湖面和河道进行实验,结果显示,5个固定监测点的监测参数在正常范围内,10个随机监测点的监测数据与专业仪器监测的数据相比,可决系数在0.94~0.99,验证了无人船运行的可行性以及监测数据的可靠性。展开更多
随着通信技术不断发展,5G在各个行业中的应用愈发广泛。5G具有可靠性高、延时较低、覆盖范围广等特点,将其应用于城市轨道交通车地无线通信系统,能够更好地满足城市轨道交通车地无线通信需求。基于此,文章分析5G的优点,阐述城市轨道交...随着通信技术不断发展,5G在各个行业中的应用愈发广泛。5G具有可靠性高、延时较低、覆盖范围广等特点,将其应用于城市轨道交通车地无线通信系统,能够更好地满足城市轨道交通车地无线通信需求。基于此,文章分析5G的优点,阐述城市轨道交通车地无线通信中的长期演进技术(Long Term Evolution,LTE)、无线局域网(Wireless Local Area Network,WLAN)技术,提出5G在城市轨道交通车地无线通信系统中的应用。通过文章研究为相关人员提供参考借鉴,以便在城市轨道交通车地无线通信系统中发挥5G的优势与价值。展开更多
文摘To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetrain. The shift schedule can keep the torque converter working in the high efficiency range under all the working conditions except in the low efficiency range on the left when the transmission worked at the lowest shift, and in the low efficiency range on the right when the transmission worked at the highest shift. The shift quality key factors were analysed. The automatic trans-mission's bench-test adopting this shift schedule was made on the automatic transmission's test-bed. The experimental results showed that the shift schedule was correct and that the shift quality was controllable.
基金funding from the Australian Government,via Grant No.AUSMURIB000001 associated with ONR MURI Grant No.N00014-19-1-2571。
文摘This paper considers a time-constrained data collection problem from a network of ground sensors located on uneven terrain by an Unmanned Aerial Vehicle(UAV),a typical Unmanned Aerial System(UAS).The ground sensors harvest renewable energy and are equipped with batteries and data buffers.The ground sensor model takes into account sensor data buffer and battery limitations.An asymptotically globally optimal method of joint UAV 3D trajectory optimization and data transmission schedule is developed.The developed method maximizes the amount of data transmitted to the UAV without losses and too long delays and minimizes the propulsion energy of the UAV.The developed algorithm of optimal trajectory optimization and transmission scheduling is based on dynamic programming.Computer simulations demonstrate the effectiveness of the proposed algorithm.
文摘In this paper,the case of a battery charger for electric vehicles based on a wireless power transmission is addressed.The specificity of every stage of the overall system is presented.Based on calculated and measured results,relevant capacitive compensations of the transformer and models are suggested and discussed in order to best match the operating mode and aiming at simplifying as much as possible the control and the electronics of the charger.
文摘The wireless communication system's performance is greatly constrained by the wireless channel characteristics,especially in some specific environment.Therefore,signal transmission will be greatly impacted even if not in a complicated topography.Testing results show that it is hardly to characterize the radio propagation properties for the antenna installed on the ground.In order to ensure a successful communication,the radio frequency(RF)wireless signal intensity monitor system was designed.We can get the wireless link transmission loss through measuring signal strength from received node.The test shows that the near-ground wireless signal propagation characteristics still can be characterized by the log distance propagation loss model.These results will conduce to studying the transmission characteristic of Near-Earth wireless signals and will predict the coverage of the earth's surface wireless sensor network.
文摘设计了一款轻便小巧的水质监测无人船,结合一体化水质监测电控系统进行水质温度、溶解氧质量浓度、氨氮质量浓度、pH的监测。硬件部分采用模块化结构设计,以Raspberry Pi 3B+作为主控模块,协同运行电源管理模块、数据采集模块、导航定位模块、避障模块、视觉采集模块、电机驱动模块、无线通信模块及岸基上位机。软件设计包括主程序、自主航行模式程序、遥控航行模式程序及无线通信模块程序的设计。将无人船放在城市湖面和河道进行实验,结果显示,5个固定监测点的监测参数在正常范围内,10个随机监测点的监测数据与专业仪器监测的数据相比,可决系数在0.94~0.99,验证了无人船运行的可行性以及监测数据的可靠性。
文摘随着通信技术不断发展,5G在各个行业中的应用愈发广泛。5G具有可靠性高、延时较低、覆盖范围广等特点,将其应用于城市轨道交通车地无线通信系统,能够更好地满足城市轨道交通车地无线通信需求。基于此,文章分析5G的优点,阐述城市轨道交通车地无线通信中的长期演进技术(Long Term Evolution,LTE)、无线局域网(Wireless Local Area Network,WLAN)技术,提出5G在城市轨道交通车地无线通信系统中的应用。通过文章研究为相关人员提供参考借鉴,以便在城市轨道交通车地无线通信系统中发挥5G的优势与价值。
