taking the bucket of multi function earth drill as an example, combining with the conception of multi sensor integration and data fusion, adopting the terrene column chart and digging torque formula as control depende...taking the bucket of multi function earth drill as an example, combining with the conception of multi sensor integration and data fusion, adopting the terrene column chart and digging torque formula as control dependence, the detecting method of the earth drill’s working state is introduced. Multi sensor data fusion is done with the aid of BP neural network in Matlab. The data to be interfused are pre processed and the program of simulation and “point checking” is given.展开更多
A horizontality adjusting system of the earth drill's platform is designed todeal with the operation difficulty of the platform which appeared while the earth drill is used.The proportional-impulse control to elim...A horizontality adjusting system of the earth drill's platform is designed todeal with the operation difficulty of the platform which appeared while the earth drill is used.The proportional-impulse control to eliminate the over-adjustment andelectricity-hydraulic-proportional control to drive the adjusting mechanism are adopted in thesystem. The control scheme and control algorithm are introduced in detail. The software flow chartis given.展开更多
A Nd/YAG pulse laser is used to drill Sm Co and Nd Fe B permanent magnetic rotor The experimental studies and analysis on the morphology and the phase composition of the drilled rotor are described In the centr...A Nd/YAG pulse laser is used to drill Sm Co and Nd Fe B permanent magnetic rotor The experimental studies and analysis on the morphology and the phase composition of the drilled rotor are described In the centre of the drilled rotor, there is a hole whose diameter is roughly equal to the girdle size of the Gauss laser beam The hole wall is composed of rapidly fused amorphous matter, whose morphology and composition are obviously different from that before hole drilling The grain in heat affected zone has been fined, but the composition has not changed The experimental results show that the reasonable selection of laser parameters according to physical properties of the materials is necessary in order to improve product quality and production efficiency They also show that the lower laser power, the narrower pulse and the mulitiple drilling are advantageous to the processing for hard brittle materials like rare earth magnets展开更多
A vertical antenna embedded in earth with conductive coating has been investi-gated by employing the method of integral equation.This topic is available to EM-MWD(Elec-tromagnetic Measurement-While-Drilling)system,whi...A vertical antenna embedded in earth with conductive coating has been investi-gated by employing the method of integral equation.This topic is available to EM-MWD(Elec-tromagnetic Measurement-While-Drilling)system,which is a new real time system for drillingmeasurement.Under the condition that the wave number of the earth is much larger than that ofthe air,a current integral equation has been derived.After the current distribution having beendetermined,the electric field strength on the earth surface has been predicted and its dependenceson the operating frequency and the depth of the well have been discussed as well.展开更多
文摘taking the bucket of multi function earth drill as an example, combining with the conception of multi sensor integration and data fusion, adopting the terrene column chart and digging torque formula as control dependence, the detecting method of the earth drill’s working state is introduced. Multi sensor data fusion is done with the aid of BP neural network in Matlab. The data to be interfused are pre processed and the program of simulation and “point checking” is given.
文摘A horizontality adjusting system of the earth drill's platform is designed todeal with the operation difficulty of the platform which appeared while the earth drill is used.The proportional-impulse control to eliminate the over-adjustment andelectricity-hydraulic-proportional control to drive the adjusting mechanism are adopted in thesystem. The control scheme and control algorithm are introduced in detail. The software flow chartis given.
文摘A Nd/YAG pulse laser is used to drill Sm Co and Nd Fe B permanent magnetic rotor The experimental studies and analysis on the morphology and the phase composition of the drilled rotor are described In the centre of the drilled rotor, there is a hole whose diameter is roughly equal to the girdle size of the Gauss laser beam The hole wall is composed of rapidly fused amorphous matter, whose morphology and composition are obviously different from that before hole drilling The grain in heat affected zone has been fined, but the composition has not changed The experimental results show that the reasonable selection of laser parameters according to physical properties of the materials is necessary in order to improve product quality and production efficiency They also show that the lower laser power, the narrower pulse and the mulitiple drilling are advantageous to the processing for hard brittle materials like rare earth magnets
基金Supported by National Natural Science Foundation of China
文摘A vertical antenna embedded in earth with conductive coating has been investi-gated by employing the method of integral equation.This topic is available to EM-MWD(Elec-tromagnetic Measurement-While-Drilling)system,which is a new real time system for drillingmeasurement.Under the condition that the wave number of the earth is much larger than that ofthe air,a current integral equation has been derived.After the current distribution having beendetermined,the electric field strength on the earth surface has been predicted and its dependenceson the operating frequency and the depth of the well have been discussed as well.
