The Safety Parameters Monitoring System for the Coal Mine Based on CAN Bus Communication and Intelligent Data acquisition

In this paper, a monitoring and controlling system for the safety in production and environmental parameters of a small and medium-sized coal mine has been developed after analyzing the current domestic coal production and security conditions. The client computer can convert the analog signal about the safety in production and environmental parameters detected from the monitoring terminal into digital signal, and then, send the signal to the coal mine safety monitoring centre. This information can be analyzed, judged, and diagnosed by the monitoring-management-controlling software for helping the manager and technical workers to control the actual underground production and security situations. The system has many advantages including high reliability, better performance of real-time monitoring, faster data communicating and good practicability, and it can effectively prevent the occurrence of safety incidents in coal mines.     

Gas and coal outbursts in Polish minescauses and assessing methods

The paper presents some information about gas and coal outbursts threat in Polish coal mines.It shows the methodology for threat identification and monitoring for gas and coal outbursts in the Polish coal mines.One of the main methods of assessing threats in the mining industry in Poland and China is desorbometric method.The paper presents some results of estimation of uncertainties of the desorption rate Δp,determined in situ,by use of liquid manometric desorbometer gauge.It was observed that,if there are ...     

Propagation patterns of microseismic waves in rock strata during mining: an experimental study

Microseismic monitoring has been widely used in mines for monitoring and predicting dynamic disasters such as rockbursts and waterbursts. However, to develop high-precision microseismic monitoring systems, the propagation patterns of microseismic waves under complex geological conditions must be elucidated. To achieve this aim, a simulation model of a typical coalmine was designed using similar materials according to the similarity theory to simulate the mining process. Geophones were embedded into the model to detect the propagation of elastic waves from microseisms. The results show that in an unmined solid rock mass, the wave velocity in shallow rock strata is mainly affected by geologically weak planes, whereas in deep strata it is affected mainly by the density of the rock mass. During propagation, the amplitude first decreases and then increases rapidly with increasing propagation distance from the coal layer. After mining, our results indicate that the goaf causes significant attenuation of the wave velocity. After the goaf was backfilled, the velocity attenuation is reduced to some extent but not eliminated. The results of this study can be used as guidelines for designing and applying microseismic monitoring systems in mines.     

Structure instability forecasting and analysis of giant rock pillars in steeply dipping thick coal seams

Structure stability analysis of rock masses is essential for forecasting catastrophic structure failure in coal seam mining. Steeply dipping thick coal seams (SDTCS) are common in the Urumqi coalfield, and some dynamical hazards such as roof collapse and min-ing-induced seismicity occur frequently in the coal mines. The cause of these events is mainly structure instability in giant rock pillars sand-wiched between SDTCS. Developing methods to predict these events is important for safe mining in such a complex environment. This study focuses on understanding the structural mechanics model of a giant rock pillar and presents a viewpoint of the stability of a trend sphenoid fractured beam (TSFB). Some stability index parameters such as failure surface dips were measured, and most dips were observed to be between 46° and 51°. We used a digital panoramic borehole monitoring system to measure the TSFB’s height (ΔH), which varied from 56.37 to 60.50 m. Next, FLAC3D was used to model the distribution and evolution of vertical displacement in the giant rock pillars;the re-sults confirmed the existence of a TSFB structure. Finally, we investigated the acoustic emission (AE) energy accumulation rate and ob-served that the rate commonly ranged from 20 to 40 kJ/min. The AE energy accumulation rate could be used to anticipate impeding seismic events related to structure failure. The results presented provide a useful approach for forecasting catastrophic events related to structure in-stability and for developing hazard prevention technology for mining in SDTCS.     

Design and Construction of Su-tong Bridge Tower

Sutong Bridge tower which is 300.4 m is the highest one in the world. The tower anchor area uses the steelconcrete composite structure, its structure and the stress mechanism are complex, so it must be paid more attention to the structure durable issue. The 300 m height makes the tower quite sensitive to the environmental factors such as wind and temperature. The wind resistance safety of tower in construction stage is especially important. In this paper, the design of composite structure is introduced. The key technologies of tower geometry control and wind resistance in construction stage are analyzed.     

Highly Sensitive and Portable Gas Sensing System Based on Reduced Graphene Oxide

Graphene has been widely used in gas-sensing applications due to its large specific surface area and strong adsorption ability. Among different forms of graphene used as gas-sensing materials, reduced graphene oxide is one of the most convenient and economical materials to integrate with Si-based electronics, which is very important to graphene-based gas sensors. In addition, the stacking structure of graphene oxide flakes facilitates absorption and detection of gas molecules. Based on reduced graphene oxide, a highly sensitive and portable gas-sensing system was demonstrated here. Solution-based graphene oxide was cast on a chip like a TF memory card and then reduced thermally. A signal acquisition system was designed to monitor resistance variation as a sign of gas concentration. This miniature graphene-based gas sensor array demonstrates a new path for the use of graphene in gas-detection technologies. And the creation of a sensitive and portable graphene gas sensor also shows great potential in fields such as medicine and environmental science.     

Reliability Study on the Risk Precontrol Management System of Coal Mines Safety

Risk precontrol management system of coal mines safety（ RPMSCS） provides a set of preventive safety management strategy for high-risk coal industries, which has captured extensive attentions. Fundamentally,there are several membership systems with subsystems in the management system, and the subsystem reliability has an important influence on the management system performance. Through analyzing the structure characteristics of the management system,the phase type distribution was employed to analyze its subsystem reliability by considering repair process and three states including working,fail-abnormal,and fail-emergency states. The reliability indices of the subsystem were derived respectively,including the probabilities that the subsystem in three states,mean time to the first failure, mean time to first failemergency,mean working time to first fail-emergency,and mean maintenance time to the first fail-emergency, are derived respectively. The probabilities of the membership systems and the management system in three states were also derived. Some numerical examples were used to show the procedures. The result is important for better understanding the management system operation and improving its operational performance from the respect of system reliability.     

The HITCR-I： Evaluation on a free gait generation method for the hexapod robot on irregular terrain

The purpose of this paper is to present and evaluate a method of free gait generation for HITCRI,a hexapod walking robot.The HITCR-I is designed as a modularized structure of legs that is based upon a four-bar linkage mechanism and with force sensors in the tip of legs,distributed hardware structure and a modular software structure of the control system.Based on a set of local rules between adjacent legs,finite state machine （FSM） model is built to control the coordination of legs.An automatic smooth transition of gait pattern is achieved through deriving the mathematical relation between gait pattern and locomotion parameters.The disordered inter-leg phase sequence is adjusted to a regular state smoothly and quickly by the local rules based FSM,and the gait pattern can transform automatically adapting to irregular terrain.The experiment on HITCR-I has demonstrated that it can walk through irregular terrain reliably and expeditiously with the free gait controller designed in this paper.     

Modeling and fuzzy adaptive proportion-integration-differentiation control of X-Y position servo system actuated by oscillating pneumatic cylinder

<正> The servo system actuated by oscillating pneumatic cylinder for X-Y plate is a multi-variable nonlinearcontrol system.Its mathematical model is established,and nonlinear factors are analyzed.Due to the existenceof deadlock zone and the small damp of the pneumatic oscillating cylinder,it is likely to result inovershoot,and there is also certain steady-state error,so online modifying of proportion-integration-differentiation(PID) parameters is needed so as to achieve better control performance.Meanwhile considering thestability demand for long-term run,a fuzzy adaptive PID controller is designed.The result of hardware-inloop(HIL) test and real-time control experiment shows that the adaptive PID controller has desirable selfadaptabilityand robustness to external disturbance and to change of system parameters,and its control performanceis better than that of traditional PID controllers.     

Sutong bridge - construction and control technology of the superstructure

The Sutong Yangtze River Bridge （short as Sut.ong Bridge） is now the largest span cable-stayed bridge in the world. The construction of the superstructure of the middle bridge covered several stages including erection of the big block girders for the side span, assistant span and tower area, erection of standard girders and closure of the middle span. The big block girders were hoisted by a floating crane, and the standard girders were hoisted by a double crane system on the deck. The pushing assistant method was adopted for the middle span closure construction. Furthermore, key technologies and innovative methods used in the processes of girder erection and cable assemblage in all stages were expatiated systematically. An all-stage self- adaptive geometry control method was used in the construction process. By accurately controlling the unstressed dimensions and shape of all structural components in each step, and realization that the control system and the controlled system adapt to each other, the goal was to make control of the final line shape and inner force of the bridge structure achievable. Two solutions, including GPS based and total station based dynamic geometry monitoring systems, were used to resolve the measure problem under the wide - range of wind-induced vibrations in the long cantilever state. Finally, research on the wind-induced vibration of the superstructure during the construction period was executed. Buffeting response analysis to the longest single and double cantilever states were carried out. The analysis and evaluation of wind resistance safety of the main girders under the longest single cantilever state was made, and corresponding wind resistance measures were suggested. The as-built geometric error and cable force error were controlled in a required design range, and this whole technological achievement can be a benchmark for construction of other large span cable-stayed bridges in the future.     

瓦斯智能预警系统的构建研究

煤矿瓦斯的治理和防范是煤矿安全的重要内容。现行的信息化安全管理手段如监测监控系统等都存在一定的缺陷和不足,例如通信协议不规范、监测信息可靠性不高、智能化较低等。本文综述了监测监控系统的现状和不足,对煤矿安全预警系统的框架进行了构建,提出了构建瓦斯智能预警平台的系统思想;从三类危险源角度列出煤矿事故致因模型;提出了煤矿瓦斯预警系统结构和主要模块,并介绍了系统的主要功能;最后提出系统设计方法及其中的主要关键技术。     

干河煤矿瓦斯监测监控系统安装与建构

根据目前煤矿开采的现状,以瓦斯、煤尘及火灾的事故最为严重,其中危害最大的是瓦斯事故,因此必须要提高煤矿瓦斯防护效率。对干河煤矿瓦斯监测监控系统安装与构建进行了研究。     

煤矿高标准瓦斯管理技术与实践研究

当前瓦斯事故多数是管理原因所致.潞安矿业集团公司利用安全工程学的系统原理、控制论原理、重点控制原理、人本原理、事故预测预防原理和经济学原理,提出了高标准瓦斯管理的理论,将瓦斯管理归纳为"33.36.19"结构体系,实施了"低瓦斯矿井按高瓦斯管理、高瓦斯矿井高标准管理",实现了矿区的瓦斯安全.使全公司所辖矿井瓦斯管理水平普遍得到提高,取得了显著的瓦斯治理效果,杜绝了瓦斯灾害事故的发生,并取得了巨大的经济和社会效益.其管理理念、理论、方法和技术对煤炭行业的其他矿区具有重要的推广和借鉴价值.     

基于预测模型的瓦斯监控系统的设计

针对目前我国煤矿事故的主要形势,提出具有预测功能的智能瓦斯监控系统。设计了基于单片机的监控分站、CAN总线通信;提出了基于混沌模型的瓦斯浓度预测方法;并结合微型计算机处理技术,采用简单易行的软硬件设计。该系统减少了硬件设计的复杂性,提高了系统工作的可靠性,降低了煤矿瓦斯监控系统成本。经试验验证该系统具有检测准确,可靠性高,预测准确等特点,适合中小规模的煤矿要求。     

基于GSM和PIC单片机的可燃气体监控系统设计

为准确、高效、实时地对可燃气体进行远程监控,设计了一种基于GSM短消息和PIC单片机的可燃气体监控报警系统。本文详细阐述了系统的组成结构和软硬件设计方法。以PIC16F877为控制核心,利用红外线IR-622传感器来采集可燃气体浓度,并通过GSM无线模块把情况信息传输到用户手机。经测试,该系统使用方便、稳定,具有广阔的应用前景。     

基于Android平台的智能瓦斯预警系统设计

瓦斯监测与预警是确保煤矿安全生产的重要途径。针对当前广泛使用的瓦斯监测与预警系统存在的问题,提出基于Android平台的智能瓦斯预警系统设计和开发。该系统主要解决瓦斯数据的传递、存储、显示和预警等问题。该系统可以在手持设备上实现瓦斯监测和预警,有效提高瓦斯监测和预警的实时性和有效性。     

深井中厚煤层突出预测敏感指标临界值研究

“突出”已成为我国煤矿安全生产的主要隐患之一,“突出”防治成为矿井安全工作的重中之重.采掘工作面突出危险性预测预报敏感指标的确定是矿井综合防突体系中重要的环节,为了有效预测及防治深部矿井工作面采掘过程中煤与瓦斯突出事故,采用理论分析、实验室分析和现场试验相结合的多种研究手段,获得了试验区13 -1煤层突出预测敏感指标及...     

五沟煤矿保护层开采技术及卸压范围探讨

理论研究和现场应用表明,保护层开采和预抽煤层瓦斯是防治煤与瓦斯突出最有效、最经济的区域性措施。对于采用保护层开采技术的矿井,首先必须计算出其卸压范围,然后才能在该区域内设计瓦斯抽采系统和布置作业工作面。本文依据煤岩卸压变形理论和煤层瓦斯赋存特性,结合安徽皖北煤电公司五沟煤矿保护层开采的实践应用,确定了本矿煤层开采的合理顺序,得出保护层开采后的卸压范围.研究结果可为现场瓦斯防治提供参考依据。     

KJ95N型煤矿综合监控系统

KJ95N型煤矿综合监控系统是采用先进的计算机网络技术、ARM嵌入式技术和EMC抗干扰技术等最新研制推出的矿井综合监控系统,符合《AQ6201-2006煤矿安全监控系统通用技术要求》及相关行业标准,可实现矿井上下各类环境参数、生产参数、动目标及瓦斯抽放过程的监测与显示、报警与控制,适于大中小各类矿井使用。文章介绍了该系统的系统架构、功能特点及主要技术参数,并对煤矿安全监控系统接入全矿井综合自动化或综合监测监控系统网络的必要性和可行性进行了探讨[2]。