2013 Vol. 39, No. 12

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Design of machinery-tracked automatic system of hydraulic support
ZHU Jin-yu, LI Guo-lia
2013, 39(12): 1-4. doi: 10.7526/j.issn.1671-251X.2013.12.001
<Abstract>(34) <PDF>(9)
Abstract:
In view of problem of low automatic degree of current electrohydraulic control system of hydraulic support, a machinery-tracked automatic system of hydraulic support was designed. The system takes traction position and direction of shearer as reference, and accords to preset action rule of hydraulic support to control action of the hydraulic support, so as to make the hydraulic support to track the shearer to finish operations of sliding advance of support and grouped pushing timely and orderly. Test result validates feasibility of the system.
Design of photometric separation system for coal and gangue
WANG Wei-dong, ZHANG Chen, MA Zhong-liang, CAO Chun-xiao, WANG Tong-tong, ZHANG Lu-qi, REN Chun-xing, LIANG Jing
2013, 39(12): 5-8. doi: 10.7526/j.issn.1671-251X.2013.12.002
<Abstract>(35) <PDF>(3)
Abstract:
In view of requirements of underground separation and backfilling and utilization for coal and gangue, the paper proposed a design scheme of photometric separation system for coal and gangue based on laser 3D scanning and dynamic weighing. Firstly, the system uses weighing unit to weigh measured object, and extracts laser line from each image of the measured object to calculate areas of optical section of the measured object. Then the system uses recognition algorithm to recognize coal and gangue according to volume and weight of the measured object, and sends separation signal to driving unit of separation for coal and gangue according to recognition result, so as to realize real-time online separation for coal and gangue. Test result shows that the system can recognize coal and gangue accurately combining with relative actuator and its recognition rate is 90%.
Development of panoramic scanning device of mine ore-pass
SHI Zhi-jun, LIU Yan-zhang, YE Yi-cheng, TU Fu-quan, ZHAO Wei, ZHANG Xu, YANG Ke-ni
2013, 39(12): 8-12. doi: 10.7526/j.issn.1671-251X.2013.12.003
<Abstract>(28) <PDF>(3)
Abstract:
In view of problems that manual checking ore-pass method cannot observe wall of mine ore-pass clearly and has hidden danger, a panoramic scanning device of mine ore-pass was designed, which was composed of data collection system, hoisting system, positioning system of ore-pass depth and data processing and video monitoring system. The data collection system collects image data of wall of ore-pass through four symmetrically arranged cameras, the image data is transmitted to the data processing and video monitoring system through gigabit network line after processed by gigabit network exchanger. The data processing and video monitoring system expanses the image of the wall and displays it on video monitoring interface. The positioning system of ore-pass depth collects depth information of scanning probe in ore-pass, and positioning program of ore-pass depth calculates depth of the scanning probe in the ore-pass according to circumference of number axis and the depth information. Actual test result shows that the device can realize panoramic scanning for ore-pass with high-depth, large-diameter and lightless.
Design of an intelligent miner lamp with gas alarming based on ZigBee
LIU Jiang-xia, WU Qiang, FAN Bao-de
2013, 39(12): 13-17. doi: 10.7526/j.issn.1671-251X.2013.12.004
<Abstract>(45) <PDF>(3)
Abstract:
In view of problem that traditional gas detecting methods only continuously monitor some key positions of mine, an intelligent miner lamp with gas alarming based on ZigBee was designed. The miner lamp is taken as a mobile node of ZigBee network, uses LED as illuminant and lithium battery as power supply, which has functions of gas detection, wireless positioning, ZigBee communication, charge management and protection. Test results show that actual parameters and communication function of the miner lamp meet design requirements and can realize omnidirectional coverage for underground gas detection.
Design of multi-host communication protocol module of RS485 based on class token ring
WANG Shu-feng, FANG Bin, CHENG Da-wei, LI Long
2013, 39(12): 17-20. doi: 10.7526/j.issn.1671-251X.2013.12.005
<Abstract>(114) <PDF>(3)
Abstract:
In view of problems of bad real-time performances, no plug-and-play function and low communication efficiency existed in poll calling mode of main control computer for communication nodes used by RS485 bus of current coal mine safety monitoring and control system, a multi-host communication protocol module of RS485 based on class token ring was designed. Token information is included in frame head of each frame, it is frame end mark in 4 byte time of RS485 bus idle state, it is snatching sending time of key devices in 4~5 byte time of RS485 bus idle state, and it is snatching sending time of common devices in 5~6 byte time of RS485 bus idle state. Communication modes exchange data with main control computer by turns according to token order under normal condition. While one device needs snatch to send data under emergency condition, it can snatch RS485 bus in snatching sending time. Test analysis shows that the module has good application effect under conditions that RS485 bus has little capacity and channel interference.
Design of silicon piezoresistive barometer with high-precisio
GAO Lei, MA Ying-hui, LIU Yi, MAO Wan-hua
2013, 39(12): 21-25. doi: 10.7526/j.issn.1671-251X.2013.12.006
<Abstract>(50) <PDF>(3)
Abstract:
In view of problems of temperature drift and big discreteness of silicon piezoresistive pressure sensor which cause application of the pressure sensor to be limited, a silicon piezoresistive and digital barometer with high-precision was designed. The barometer uses surface-fitting algorithm with whole temperature range to make temperature compensation and linear processing, so as to solve problems of temperature drift and nonlinear of the silicon piezoresistive pressure sensor, and uses software to realize temperature compensation of pressure data in ATmega88PA micro-controller and sends the data to upper computer through RS485 interface. Test result shows that measuring error of the barometer is less than 0.50‰ in range of -40~+60 ℃ and the barometer meets design requirement.
Mine-used control system based on DP/LIN bus
HUO Jun-jun, ZHANG Ying-mei
2013, 39(12): 26-28. doi: 10.7526/j.issn.1671-251X.2013.12.007
<Abstract>(64) <PDF>(2)
Abstract:
In view of characteristics of low application cost and reliable low-speed communication performance of LIN bus technology, a mine-used control system based on DP/LIN bus was designed. The system is composed of DP/LIN communication host and data collection and output modules based on LIN bus. The DP/LIN communication host is used as main node of LIN bus communication network to realize data conversion between Profibus-DP bus and LIN bus. The data collection and output modules based on LIN bus are used as slave nodes of LIN bus communication network to realize collection of monitored data and output of control signal. Test and actual application results show that the system can reduce production cost of coal mine and improve feasibility of data collection and control.
Research of online dynamic weighing system of coal
LI Ping, WANG Yan-wen
2013, 39(12): 29-33. doi: 10.7526/j.issn.1671-251X.2013.12.008
<Abstract>(78) <PDF>(5)
Abstract:
The paper analyzed weighing principle and advantages and disadvantages of current online dynamic weighing system of coal, namely dynamic weighing system of belt scale, mine car scale and skip scale, and proposed a weighing system of mine car scale based on image processing technology with high measurement precision. It researched key problems of online dynamic weighing system of coal, namely calibration method, weighing sensor, dynamic mathematical model, data processing algorithm and software of upper computer system, and indicated that improving calibration precision and reducing calibration difficulty would be research direction of calibration method of online dynamic weighing system of coal; vibration string weighing sensor would be development direction of weighing sensor in future; advanced technology and theory would be research direction of dynamic mathematical model and data processing algorithm.
Gas emission prediction model based on genetic algorithm and fuzzy multivariate linear regression analysis
WANG Jiang-rong
2013, 39(12): 34-38. doi: 10.7526/j.issn.1671-251X.2013.12.009
<Abstract>(62) <PDF>(2)
Abstract:
In view of problem that classical linear regression model cannot completely reflect coupling relationship among variables and it is not suitable for gas emission prediction with fuzzy number, the paper proposed a gas emission prediction model based on genetic algorithm and fuzzy multivariate linear regression analysis. The model uses gray relation analysis method and SPSS software linear regression analysis method to determine main factors influencing on gas emission, and divides history data sample into modeling data sample and detection data sample and uses genetic algorithm to get center value and fuzzy amplitude value of fuzzy regression parameters. Experiment result shows that the model has higher precision and operability.
Research of identification of acoustic emission signal of coal and rock
TONG Min-ming, LI Peng-zhen, TONG Zi-yuan, LI Meng
2013, 39(12): 38-42. doi: 10.7526/j.issn.1671-251X.2013.12.010
<Abstract>(19) <PDF>(7)
Abstract:
In view of problem that it is difficult to identify acoustic emission signal of coal and rock burst under complicated noise environment, the paper proposed an identification method of acoustic emission signal of coal and rock based on wavelet packet and wavelet feature energy spectrum coefficient analysis. Useful acoustic emission signals are extracted by taking Symlets wavelet as wavelet basis function of acoustic emission signal of coal and rock and making denoising process with hybrid threshold algorithm. Then wavelet feature energy spectrum coefficient and wavelet packet eigenvector are obtained by using Matlab software to separately simulate wavelet packet decomposition for the useful acoustic emission signals and noise signals. Simulation results show that changing degree of each energy of eigenvector of the useful acoustic emission signals is bigger，while changing of energy of eigenvector of the noise signals is relatively stable, which can be used to identify acoustic emission signal of coal and rock.
Load model of ball mill based on power spectrum analysis
ZHANG Jie, WANG Jian-min, YANG Zhi-gang, LI Yan-jiao
2013, 39(12): 43-47. doi: 10.7526/j.issn.1671-251X.2013.12.011
<Abstract>(14) <PDF>(3)
Abstract:
The paper built load model of ball mill based on power spectrum analysis, and analyzed relations among ball mill load, sound intensity of mill noise and spectrum distribution of mill noise, that is sound pressure of detection point of mill noise is proportional to square of vibration speed of ball mill shell, noise frequency is proportional to vibration frequency of ball mill shell, mill noise signal become weaken gradually with increasing of ball mill load. Spectrum of mill noise mainly distributes under 1 500 Hz. Distribution of spectrum of mill noise is more uniform when the ball mill runs normally, and spectrum of mill noise mainly distributes 0~1 000 Hz when the ball mill runs in undergrinding. Matlab simulation result validates feasibility and effectiveness of the load model of ball mill.
Research of channel transmission attenuation characteristics of underground low-voltage power line
WEI Shao-liang, LIU Da-hai, CHANG Ying, ZHOU Guang-ping, WANG Xue-hui
2013, 39(12): 48-50. doi: 10.7526/j.issn.1671-251X.2013.12.012
<Abstract>(21) <PDF>(2)
Abstract:
In view of problems that network topology of underground low-voltage power line is complex and multi-path transmission model is difficult to suit channel modeling of underground low-voltage power line, the paper made a test for channel transmission characteristics of underground low-voltage power line. It indicated that attenuation of underground signal increases with increasing of transmission distance and changes with changing of frequency, and has certain selective fading. It took selective fading as resonant frequency point and used model of series resonant circuit to make modeling simulation for channel attenuation characteristics of underground low-voltage power line, and the simulation result shows that the model of series resonant circuit can well reflect channel transmission characteristics of underground low-voltage power line.
Research of double closed-loop control strategy for shunt active power filter
REN Zi-hui, ZHU Hui, LIU Wei, XU Sheng-long
2013, 39(12): 51-54. doi: 10.7526/j.issn.1671-251X.2013.12.013
<Abstract>(5) <PDF>(2)
Abstract:
The paper analyzed implementation principle of double closed-loop control strategy for shunt active power filter. In view of problems that PI control cannot track AC signal without static error and repetitive control has slow dynamic response speed, the paper proposed a composite control strategy based on repetitive control and PI control for current loop to improve stable tracking performance of control system of shunt active power filter by repetitive control and dynamic performance of control system of shunt active power filter by PI control. In view of problems that PI control is difficult to determine transfer function of control system of shunt active power filter and cannot online set PI parameters, the paper proposed a fuzzy PID control strategy for voltage loop to control DC voltage. Matlab/Simulink simulation result validates correctness and feasibility of the control strategy.
Research of influence of dead time by carrier phase shifted modulation on modular multilevel converter
SONG Ping-gang, LI Yun-feng, WANG Li-na
2013, 39(12): 55-60. doi: 10.7526/j.issn.1671-251X.2013.12.014
<Abstract>(5) <PDF>(2)
Abstract:
The paper analyzed influence of dead time on single sub-module of modular multilevel converter and reached conclusions that the sub-module will produce positive dead voltage from inserted state to cut-off state when arm current is positive and negative dead voltage from cut-off state to inserted state when arm current is negative. It analyzed influence of dead time on ideal fundamental voltage of modular multilevel converter, and deduced formulas of equivalent amplitude of output fundamental wave of dead voltage, actual amplitude of fundamental wave and offset of angle of output voltage, so as to reach conclusions that when voltage of DC side is fixed value, influence of dead time on modular multilevel converter relates to carrier wave ratio, dead time and phase-difference between output voltage and output current and unrelates to numbers of input module, improving modulation depth of voltage and reducing dead time can reduce influence of dead time on modular multilevel converter effectively. Simulation result validates effectiveness of the above conclusions.
Simulation analysis for reactances of quadrature-axis and direct-axis of permanent magnet synchronous motor
WANG Ying, WEN Shao-long, HU Kun
2013, 39(12): 60-63. doi: 10.7526/j.issn.1671-251X.2013.12.015
<Abstract>(15) <PDF>(2)
Abstract:
In view of problem that traditional magnetic circuit calculation for motor cannot accurately calculate reactances of quadrature-axis and direct-axis of motor because reluctance of iron core is neglected, the paper used Maxwell software to make electromagnetic analysis for an interior permanent magnet synchronous motor. The analysis results show that it cannot consider saturation of magnetic circuit of direct-axis, but must consider saturation of magnetic circuit of quadrature-axis when calculating reactances of quadrature-axis and direct-axis. There is cross magnetic circuit in direct-axis and quadrature-axis, so influence of cross saturation of magnetic circuit on reactances cannot be neglected when calculating reactances of quadrature-axis and direct-axis.
Composite control method of DC motor based on speed feedback
HUANG Zhi-chao, ZHANG Ke-wei, XIE Xia, WANG Bi
2013, 39(12): 64-69. doi: 10.7526/j.issn.1671-251X.2013.12.016
<Abstract>(28) <PDF>(2)
Abstract:
In view of problems of slow response speed and bad anti-disturbance ability existed in traditional control system of DC motor, the paper proposed a composite double-loop control method of DC motor based on disturbance observer and speed observer. The method adds feed-forward control, disturbance observer and speed observer in PID control of DC motor. The feed-forward control is used to improve response speed and tracking performance of the system. The disturbance observer makes external torque disturbance and output difference between practical object and nominal model caused by parameters change of motor model to be equivalent to control input end, namely observes equivalent disturbance and equivalent compensation is introduced in control, so as to realize complete inhibition for disturbance. The speed observer takes torque command and practical speed of the system as inputs, deploys observing and filtering functions to get observing speed without high-frequency components and lagging behind practical speed of the motor to replace the practical speed, the observing speed is used as feedback signal of speed. Simulation result shows that the method has good robust and reduces vibration phenomena and tracking error of speed and position of the motor caused by measuring noises.
Application of digital cross-correlation technology in AC electrical equipment
WU Lai-jie, MA Bin, LU Gui-ying
2013, 39(12): 69-72. doi: 10.7526/j.issn.1671-251X.2013.12.017
<Abstract>(22) <PDF>(2)
Abstract:
In view of problem of low measurement accuracy when traditional electric equipment measures formation with big resistivity, the paper proposed a scheme of using digital cross-correlation technology to reduce noise in AC electrical equipment. The scheme makes AD conversion for measuring signal of receiving electrode of AC electrical equipment and reference signal of exciting source, and calculates cross-correlation function of the measuring signal and the reference signal in DSP processor to extract useful components in the measuring signal which has the same frequency with reference signal, so as to effectively filter various noises in signal transmission process. Test result shows that using digital cross-correlation technology to process weak measuring signal of AC electrical equipment can improve measuring precision and anti-interference ability of AC electrical equipment.
Application research of wavelet neural network and PID in maximum power point tracking of wind power system
LIU Jie, YANG Hai-qun
2013, 39(12): 73-76. doi: 10.7526/j.issn.1671-251X.2013.12.018
<Abstract>(24) <PDF>(2)
Abstract:
In view of problem that power coefficient must keep maximum value when wind power system is in underpower stage, the paper proposed a control strategy of maximum power point tracking based on wavelet neural network and PID controller. The strategy uses wavelet neural network to make online identification for power coefficient and returns sensitivity information after ending of one identification period. PID controller adjusts PID parameters according to the sensitivity information. Simulation result shows that wavelet neural network and PID controller improves blade top speed ratio, power coefficient and output power of wind power system and reduces response time compared with common PID controller, which realizes optimal running of wind turbines.
Research of time-delay control of wireless network based on RBF neural network PID control
SUN Xiao-xi, HUANG You-rui, QU Li-guo
2013, 39(12): 76-81. doi: 10.7526/j.issn.1671-251X.2013.12.019
<Abstract>(14) <PDF>(2)
Abstract:
In view of problems that uncertain time-delay influences on control performance of wireless network control system and normal PID control strategy cannot meet control requirement of network, the paper proposed a time-delay control scheme of wireless network based on RBF neural network PID control. It used TrueTime toolbox of Matlab/Simulink to build simulation model of time-delay control system of wireless network, introduced design of network module, actuator module and controller module and implementation principle of using RBF neural network to set parameters of PID controller. Simulation result shows that RBF neural network PID control strategy can reduce influence of uncertain time-delay on wireless network control system in some degree and improve stability of wireless network control system compared with normal PID control strategy.
Research of double-threshold spectrum sensing algorithm based on D-S theory
WANG Meng-dong, CHEN Xiang, GUAN Yu, XIAO Shu-yan
2013, 39(12): 82-85. doi: 10.7526/j.issn.1671-251X.2013.12.020
<Abstract>(15) <PDF>(2)
Abstract:
In view of problem that traditional double-threshold spectrum sensing algorithm cannot make full use of information of sensing users between two thresholds, the paper proposed a double-threshold spectrum sensing algorithm based on D-S theory. When signal energy received by the sensing users lies between the two thresholds, the algorithm does not give judging result directly but makes local judgment, namely it uses D-S theory to make data fusion. Simulation result shows that detection probability of double-threshold spectrum sensing algorithm based on D-S theory is higher than one of the traditional double-threshold spectrum sensing algorithm, which improves performance of spectrum sensing.
Research of face recognition based on null space kernel discriminant analysis
CHENG Ting-ting, WANG Hong-dong, DING Lei
2013, 39(12): 86-90. doi: 10.7526/j.issn.1671-251X.2013.12.021
<Abstract>(13) <PDF>(2)
Abstract:
In view of problem that method of null space linear discriminant analysis is difficult to reveal nonlinear structure of data of face image space, the paper proposed a method of null space kernel discriminant analysis. It introduced derivation process and solving steps of the method in details. Test result shows that the method can extract null space of scatter matrix within class in kernel space and remove null space of scatter matrix inter classes to the utmost extent, the new extracted feature can be used to make face recognition effectively.
Design of electro-hydraulic control system of withdraw shield support on fully-mechanized face
ZHAO Bin
2013, 39(12): 91-94. doi: 10.7526/j.issn.1671-251X.2013.12.022
<Abstract>(20) <PDF>(2)
Abstract:
In view of problem that applying condition of withdraw shield support on fully-mechanized face is bad, and it has danger for underground worker to close to operate the support, an electro-hydraulic control system of withdraw shield support on fully-mechanized face was designed. It gave main technical parameters of the withdraw shield support and its arrangement mode in roadway, introduced composition and configuration of main devices of the electro-hydraulic control system of the withdraw shield support in details. Actual application shows that the system has reasonable design, simple operation and low fault rate, which avoids operation in dangerous area for underground worker.
Design of an intelligent charging cabinet for miner lamp with lithium battery
GU Yi-dong, LI Ya-bi
2013, 39(12): 95-97. doi: 10.7526/j.issn.1671-251X.2013.12.023
<Abstract>(26) <PDF>(7)
Abstract:
In view of problem that life of lithium battery in miner lamp with lithium battery is closely related to charging and discharging method, the paper proposed a design scheme of an intelligent charging cabinet for miner lamp with lithium battery. It introduced hardware design of unit of charging and management of miner lamp and middle computer of the charging cabinet. Actual application shows that the charging cabinet can accurately control charging voltage and current of lithium battery of miner lamp, and can collect information of whether on shelf and charging state of miner lamp, which improves information level of management of miner lamp.
Research of architecture of coal mine safety monitoring and control system based on Internet of Things
XU Ji
2013, 39(12): 97-100. doi: 10.7526/j.issn.1671-251X.2013.12.024
<Abstract>(29) <PDF>(2)
Abstract:
The paper analyzed problems existed in traditional coal mine safety monitoring and control system and proposed an architecture of coal mine safety monitoring and control system based on Internet of Things. It introduced key technologies used by sensing layer, transmission layer, persistence layer and application layer in the architecture. The architecture has reference for development of coal mine safety monitoring and control system.
Design of embedded automatic control system of underground locomotive
GONG Bing-jiang, DOU Wei-wei, CHEN Bin
2013, 39(12): 100-102. doi: 10.7526/j.issn.1671-251X.2013.12.025
<Abstract>(15) <PDF>(2)
Abstract:
In view of problem of safety of underground locomotive transportation, an embedded automatic control system of underground locomotive was designed. Card reader based on RFID gets position information of the locomotive through non-contact mode and sends the position information to main processor, then the main processor sends different control commands to locomotive according to different position information. Axle pulse speed sensor is used to measure speed of the locomotive and sends the speed information to the main processor, then the main processor makes timely control for speed of the locomotive combining with predetermined speed. Test result shows that the system can realize control for starting, stopping, acceleration and deceleration of the locomotive and make the locomotive finish function of ore transportation under condition of unmanned driving.
Design of embedded online monitoring and fault diagnosis system of mine ventilator
LIU Pu, FU Sheng
2013, 39(12): 103-106. doi: 10.7526/j.issn.1671-251X.2013.12.026
<Abstract>(19) <PDF>(4)
Abstract:
In view of problems of big volume, high maintenance cost, lacking specificity and easy to error operation by use of Window operating system in current online monitoring and pre-warning system of mine ventilator, an embedded online monitoring and fault diagnosis system of mine ventilator was designed. Monitored quantities such as vibration, temperature, negative pressure, voltage and current of ventilator and motor are sent to PLC data collection system through corresponding sensors and intelligent instruments, and the PLC data collection system sends data to Ethernet module. The system can get the corresponding data through protocol analysis, display the data on embedded device and make real-time diagnosis and fault alarming. Vibration sensor, temperature patrol instrument and intelligent electric meter with RS485 communication interface send collected data to embedded bus module through ModBus protocol to realize monitoring and diagnosis functions. Test result shows that the system meets each technical index of online monitoring of mine ventilator and realizes miniaturization and diversification of monitoring device.
Design of humidity controller of mine-used frequency converter
WANG Tuan-jie, HU Jian-wei
2013, 39(12): 107-109. doi: 10.7526/j.issn.1671-251X.2013.12.027
<Abstract>(29) <PDF>(4)
Abstract:
In view of problem that mine-used frequency converter is easy to be damaged under situation of condensation, a humidity controller of mine-used frequency converter was designed. The humidity controller is composed of main controller, temperature and humidity sensor, condensation sensor and heating device. When inside of the frequency converter has condensation caused by big temperature difference of inside and outside of the frequency converter, the main controller makes the frequency converter to stop working after detecting blocking signal of the condensation sensor, meanwhile the main controller opens heating device to accelerate water evaporation in the frequency converter and sends alarming signal. When the main controller detects internal environment of the frequency converter is recovered, it cancels the alarming signal and makes the frequency converter to recover normal working. Actual test result shows that the humidity controller can ensure mine-used frequency converter work reliably under moist environment.
Design of data collection system with multi-channel based on AD7606
TAO Hai-jun, ZHANG Yi-ming, ZENG Zhi-hui
2013, 39(12): 110-113. doi: 10.7526/j.issn.1671-251X.2013.12.028
<Abstract>(34) <PDF>(4)
Abstract:
In view of problem that self-carried AD conversion module of DSP chip TMS320F2812 cannot meet requirement of collecting parameters of current and voltage synchronously, a data collection system with multi-channel based on AD7606 was designed. Design of voltage/current input circuit, input filtering circuit, interface circuit between AD7606 and TMS320F2812, AD conversion program of the system were introduced in details. Test result shows that AD conversion result by using AD7606 has high precision and small error compared with AD conversion result by using self-carried AD conversion module of TMS320F2812, and it is suitable for AD conversion circuit with high precision.
Design of human machine interface of switched reluctance drive system
ZHENG Xin, SONG Jian-cheng, QU Bing-ni, JIN Zhi-xin, ZHANG Zhong-hua
2013, 39(12): 113-116. doi: 10.7526/j.issn.1671-251X.2013.12.029
<Abstract>(15) <PDF>(2)
Abstract:
In view of problem that current switched reluctance drive systems are lack of friendly human machine interface to display running state of the system and set given parameters, the paper proposed a design scheme of human machine interface of switched reluctance drive system based on simplified ModBus communication protocol. It gave general structure of the switched reluctance drive system, and introduced design of serial communication circuit and communication program in the human machine interface. Debugging result shows that the human machine interface runs stably and realizes functions of friendly display and online parameters modification for the switched reluctance drive system.
Implementation of monitoring of network management of synchronous digital hierarchy transmission system
LIU Li, YANG Duo-long
2013, 39(12): 117-119. doi: 10.7526/j.issn.1671-251X.2013.12.030
<Abstract>(16) <PDF>(3)
Abstract:
In view of problem that state of each node of subring cannot be monitored after network elements control panel of tangent point of synchronous digital hierarchy transmission system has fault, the paper took fault of network elements control panel of tangent point of synchronous digital hierarchy transmission system of a Group Company as example, analyzed cause of the fault and proposed a solution. The solution makes Qx interface of any network elements control panel of subring access into network management terminal, so as to realize monitoring for whole subring network except fault node. Actual application shows that the solution realizes real-time monitoring for services such as dispatching communication, video conference carried by the synchronous digital hierarchy transmission system.

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