A more efficient mine ventilation system, the ventilation-on-demand (VOD) system, has been proposed and tested in Canadian mines recently. In order to supply the required air volumes to the production areas of a min...A more efficient mine ventilation system, the ventilation-on-demand (VOD) system, has been proposed and tested in Canadian mines recently. In order to supply the required air volumes to the production areas of a mine, operators need to know the cause and effect of any changes requested from the VOD system. The sensitivity analysis is developed through generating a cause and effect matrix of sensitivity factors on given parameter changes in a ventilation system. This new utility, which was incorporated in the 3D-CANVENT mine ventilation simulator, is able to predict the airflow distributions in a ventilation network when underground conditions and ventilation controls are changed. For a primary ventilation system, the software can determine the optimal operating speed of the main fans to satisfy the airflow requirements in underground workings without necessarily using booster fans and regulators locally. An optimized fan operating speed time-table would assure variable demand-based fresh air delivery to the production areas effectively, while generating significant savings in energy consumption and operating cost.展开更多
A distributed feedback fiber laser based Bragg grating vibration sensor system is proposed.Demodulated by using an unbalanced M-Z interferometer,experiment demonstrates that the system runs at a sensing sensitivity of...A distributed feedback fiber laser based Bragg grating vibration sensor system is proposed.Demodulated by using an unbalanced M-Z interferometer,experiment demonstrates that the system runs at a sensing sensitivity of about 257.2 rad·s2/m and a resolution of 4.2×10-5 m/s2 for monitoring acceleration.Experimental results show that the phase-shift changes with the acceleration linearly.展开更多
TM452.93 97042586实用化光学电流互感器=Practical optical currenttransducer[刊,中]/沈悦,刘延冰,易本顺(华中理工大学.湖北,武汉(430074))//电子测量与仪器学报.—1996,10(2).—36-40论述了光学电流互感器作为计量与保护用时,光路...TM452.93 97042586实用化光学电流互感器=Practical optical currenttransducer[刊,中]/沈悦,刘延冰,易本顺(华中理工大学.湖北,武汉(430074))//电子测量与仪器学报.—1996,10(2).—36-40论述了光学电流互感器作为计量与保护用时,光路、电路的选择问题,由于温度、振动引起双折射,使光学电流互感器灵敏度变化以及如何克服等实际问题。图3参3(严寒)TP212 97042587多环光路结构光学电流传感头研究=Study of opticalcurrent transducers with dual-ring or mul-展开更多
文摘A more efficient mine ventilation system, the ventilation-on-demand (VOD) system, has been proposed and tested in Canadian mines recently. In order to supply the required air volumes to the production areas of a mine, operators need to know the cause and effect of any changes requested from the VOD system. The sensitivity analysis is developed through generating a cause and effect matrix of sensitivity factors on given parameter changes in a ventilation system. This new utility, which was incorporated in the 3D-CANVENT mine ventilation simulator, is able to predict the airflow distributions in a ventilation network when underground conditions and ventilation controls are changed. For a primary ventilation system, the software can determine the optimal operating speed of the main fans to satisfy the airflow requirements in underground workings without necessarily using booster fans and regulators locally. An optimized fan operating speed time-table would assure variable demand-based fresh air delivery to the production areas effectively, while generating significant savings in energy consumption and operating cost.
基金supported by the Science Fund for Young Scholars of Heilongjiang University,China(No.QL200901)
文摘A distributed feedback fiber laser based Bragg grating vibration sensor system is proposed.Demodulated by using an unbalanced M-Z interferometer,experiment demonstrates that the system runs at a sensing sensitivity of about 257.2 rad·s2/m and a resolution of 4.2×10-5 m/s2 for monitoring acceleration.Experimental results show that the phase-shift changes with the acceleration linearly.
文摘TM452.93 97042586实用化光学电流互感器=Practical optical currenttransducer[刊,中]/沈悦,刘延冰,易本顺(华中理工大学.湖北,武汉(430074))//电子测量与仪器学报.—1996,10(2).—36-40论述了光学电流互感器作为计量与保护用时,光路、电路的选择问题,由于温度、振动引起双折射,使光学电流互感器灵敏度变化以及如何克服等实际问题。图3参3(严寒)TP212 97042587多环光路结构光学电流传感头研究=Study of opticalcurrent transducers with dual-ring or mul-