随着人们对水电需求量的不断提高,水和电的浪费问题以及智能管理问题日益被人们所重视,因此提升水电的监管水平、提高水电的利用效率正逐步成为人们的共识。以某高校为例,设计了一个基于DCS(Distributed Control System,简称集散控制系...随着人们对水电需求量的不断提高,水和电的浪费问题以及智能管理问题日益被人们所重视,因此提升水电的监管水平、提高水电的利用效率正逐步成为人们的共识。以某高校为例,设计了一个基于DCS(Distributed Control System,简称集散控制系统)的校园水电控制系统,通过该系统可以实现全校水电的整体智能管理和监控,以满足全校水电管理的节约化、系统化和智能化要求。展开更多
The direct drive electro-hydraulic servo system is a new approach hydraulic system. It is much smaller and easier controlled than traditional systems and is a perfect energy saver. This paper will briefly introduce th...The direct drive electro-hydraulic servo system is a new approach hydraulic system. It is much smaller and easier controlled than traditional systems and is a perfect energy saver. This paper will briefly introduce the popular nonlinearities in the electro-hydraulic system and analyse the effect of nonlinearities in direct drive electro-hydraulic position servo system by means of simulation research. Some valuable conclusions are given.展开更多
Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensi...Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.展开更多
Compared with more well-known renewable energy sources, such as wind and solar, the wave energy industry is relatively new. This paper describes the structural design and construction of the oscillating water column ...Compared with more well-known renewable energy sources, such as wind and solar, the wave energy industry is relatively new. This paper describes the structural design and construction of the oscillating water column ＂greenWAVE Energy Converter＂ which was constructed during 2013 and was planned to be deployed in shallow water off the South Australian coast in 2014. Rated initially at 1 MW, the greenWAVE unit will be dedicated to electricity production, although an option is available to produce desalinated seawater. The unit base is constructed from reinforced concrete designed to international maritime codes, and the unit will be founded in approximately 10-15 m of water. The upper portion of the device extends above sea level, housing the airwave turbine and electrical control systems.展开更多
A power system with proton exchange membrane fuel cells (PEMFC) was designed for thermal underwater glider.Heat generated by PEMFC is used as the propulsion power of the glider,and the electricity is used in the contr...A power system with proton exchange membrane fuel cells (PEMFC) was designed for thermal underwater glider.Heat generated by PEMFC is used as the propulsion power of the glider,and the electricity is used in the control and sensor system.An electric energy storage system (ESS) is required which possesses high power density with good cycle life.Ultracapacitors which exhibit high power density and cycle life are considered as energy storage devices.Simulations based on a specific voyage condition indicate that ESS with ultracapacitors has positive effects on reducing the output power demand of PEMFC and lightening the power system.Experimental results show that the state of charge (SOC) is related to the capacitance and resistance in ultracapacitor ESS.展开更多
文摘随着人们对水电需求量的不断提高,水和电的浪费问题以及智能管理问题日益被人们所重视,因此提升水电的监管水平、提高水电的利用效率正逐步成为人们的共识。以某高校为例,设计了一个基于DCS(Distributed Control System,简称集散控制系统)的校园水电控制系统,通过该系统可以实现全校水电的整体智能管理和监控,以满足全校水电管理的节约化、系统化和智能化要求。
文摘The direct drive electro-hydraulic servo system is a new approach hydraulic system. It is much smaller and easier controlled than traditional systems and is a perfect energy saver. This paper will briefly introduce the popular nonlinearities in the electro-hydraulic system and analyse the effect of nonlinearities in direct drive electro-hydraulic position servo system by means of simulation research. Some valuable conclusions are given.
文摘Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.
文摘Compared with more well-known renewable energy sources, such as wind and solar, the wave energy industry is relatively new. This paper describes the structural design and construction of the oscillating water column ＂greenWAVE Energy Converter＂ which was constructed during 2013 and was planned to be deployed in shallow water off the South Australian coast in 2014. Rated initially at 1 MW, the greenWAVE unit will be dedicated to electricity production, although an option is available to produce desalinated seawater. The unit base is constructed from reinforced concrete designed to international maritime codes, and the unit will be founded in approximately 10-15 m of water. The upper portion of the device extends above sea level, housing the airwave turbine and electrical control systems.
基金Supported by the State Key Program of National Natural Science Foundation of China (No. 50835006)Science & Technology Support Planning Foundation of Tianjin (No. 09ZCKFGX03000)
文摘A power system with proton exchange membrane fuel cells (PEMFC) was designed for thermal underwater glider.Heat generated by PEMFC is used as the propulsion power of the glider,and the electricity is used in the control and sensor system.An electric energy storage system (ESS) is required which possesses high power density with good cycle life.Ultracapacitors which exhibit high power density and cycle life are considered as energy storage devices.Simulations based on a specific voyage condition indicate that ESS with ultracapacitors has positive effects on reducing the output power demand of PEMFC and lightening the power system.Experimental results show that the state of charge (SOC) is related to the capacitance and resistance in ultracapacitor ESS.
