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Availability analysis of the main conveyor in the Svea Coal Mine in Norway

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International Journal of Mining Science and Technology 2014年第5期24卷 587-591页

作者： Simon Furuly Javad Barabady Abbas Barabadi Department of Engineering and Safety University of TromsФTromsФN-9037Norway

Reliability and maintainability of mining industry is more in focus than ever, and the mining systems are becoming more complex and the equipment more expensive to repair or modify. Unplanned failures can result in significant costs, especially when the machinery is hard to repair or spare parts are far away. This paper presents a case study describing a reliability and maintainability analysis of the main conveyor system of the Svea Coal Mine located in Svalbard, Norway. The conveyor system includes several separate conveyors. In this study, the main six conveyors of the whole system were selected for the analysis. The failure and repair data of the conveyors were collected for the whole year of 2010 using maintenance and daily reports. The date was analyzed and the result shows that the availability of six conveyers is 96.44%for one year of operation. However, reliability of these conveyers needs to be improved in order to reduce the number of failures.

关键词： Reliability Maintainability Availability conveyor Coal mine

A New Current conveyor Full-Wave Rectifier for Low Frequency/Small Signal Medical Applications

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Circuits and Systems 2018年第3期9卷 58-65页

作者： Adisak Monpapassorn Department of Electrical Engineering Southeast Asia University Bangkok Thailand

This paper presents a new current conveyor (CCII+) full-wave rectifier for low frequency/small signal medical applications. The proposed rectifier is based on the current conveyor full-wave rectifier proposed previously, but the proposed rectifier is better in view of no need diodes to rectify, and no need bias sources to overcome the zero crossing error. It needs only two CCII+s, two resistors, and three simple current mirrors, which is easy for IC implementation and for building in many countries. The PSPICE simulation with the current conveyor CCII+ in the current feedback opamp AD844 IC and the 2N2222 bipolar current mirror shows the good low frequency/small signal rectification, the operation voltage of down to 6 .

关键词： Full-Wave Rectifier Current conveyor Low Frequency Medical Circuit

High Frequency Oscillator Design Using a Single 45 nm CMOS Current Controlled Current conveyor (CCCII+) with Minimum Passive Components

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Circuits and Systems 2011年第2期2卷 53-59页

作者： Mohd Yusuf Yasin Bal Gopal 不详

In the field of analog VLSI design, current conveyors have reasonably established their identity as an important circuit design element. In the literature published during the past few years, numerous application have been reported which are based on a variety of current conveyors. In this paper, an oscillator circuit has been proposed. This oscillator is designed using a single positive type second generation current controlled current conveyor (CCCII+). A CCCII has parasitic input resistance on it’s current input node. This resistance could be exploited to reduce circuit complexities. Thus in this accord, a novel oscillator circuit is proposed which utilizes the parasitic resistance of the CCCII+ along with a few more passive components.

关键词： Current Mode (CM) Circuit Applications Current conveyor (CC) Current Controlled Current conveyor (CCC) Applications CCCII Oscillator Circuit Single CCCII+ Oscillator Circuit Low Power Oscillator Circuit

MISO-Type Voltage-Mode Universal Biquadratic Filter Using Single Universal Voltage conveyor

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Circuits and Systems 2017年第9期8卷 227-236页

作者： Kanhaiya Lal Pushkar Kavya Gupta Department of Electronics and Communication Engineering Maharaja Agrasen Institute of Technology New Delhi India Electronics and Communication Engineering Cell Radiance EdutechTM DDA Market Delhi India

A universal biquadratic filter using single universal voltage conveyor (UVC), two resistors and two capacitors is presented in this paper. The proposed structure has three inputs and one output and can realize all the five standard biquadratic filters: low-pass (LP), high-pass (HP), band-pass (BP), band-reject (BR) and all-pass (AP) from the same circuit configuration. The presented universal filter offers low active and passive sensitivities. SPICE (Version 16.5) simulation results using 0.18 μm TSMC technology have been included.

关键词： Universal Voltage conveyor Voltage-Mode Filter Analog Circuit Design

Single-Resistance Controlled Sinusoidal Oscillator Employing Single Universal Voltage conveyor

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Circuits and Systems 2018年第1期9卷 1-7页

作者： Kanhaiya Lal Pushkar Department of Electronics and Communication Engineering Maharaja Agrasen Institute of Technology New Delhi India

In this paper, a new single-resistance controlled sinusoidal oscillator (SRCO) using single universal voltage conveyor (UVC) has been presented. The proposed SRCO employs single universal voltage conveyor, three resistors, and two capacitors. The proposed configuration offers the following advantageous features (1) independent control of condition of oscillation and frequency of oscillation (2) low passive sensitivities. The validity of the proposed SRCO has been established by SPICE (version 16.5) simulations using Taiwan Semiconductor Manufacturing Company (TSMC) 0.18 μm technology.

关键词： Universal Voltage conveyor SRCO Sinusoidal Oscillator

Feasibility of Chain conveyor Cutter for Ocean Disposal Site＇s Construction

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Journal of Geological Resource and Engineering 2017年第4期5卷 169-177页

作者： Hideki Shimada Sugeng Wahyudi Takashi Sasaoka Akihiro Hamanaka Shizuo Ikuta Department of Earth Resources Engineering Kyushu University Fukuoka 819-0395 Japan Land Creative Co. Ltd Omuta 837-0927 Japan

The concept of ocean disposal site is proven technology. One of the most concerns in ocean disposal site is the leakage ofpollutants into the ocean from waste materials. In order to prevent its happening, technically, a vertical impermeable wall is constructedaround the disposal site. However, the conventional method fails to guarantee zero leakage due to method＇s limitation. This paperpresents the use of CCC （chain conveyor cutter） method to construct vertical impermeable wall. The feasibility of CCC for oceandisposal site is evaluated by means of pollutant dispersion model, and moreover, the result is compared with conventional method. Theresult indicates that the CCC method is technically feasible for ocean disposal site＇s construction. Additionally, this method showsbetter as for technique and economic point of view than that of the conventional method. One of advantage of CCC method is the abilityto construct homogeneous wall in regard to strength and permeability, which cannot be found in the conventional ocean disposaltechnology.

关键词： Chain conveyor cutter ocean disposal soil improvement.

Optimal Driving of Large Belt conveyor with Multi-roller Variable-Frequency Drive

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Journal of China University of Mining and Technology 2004年第2期14卷 231-237页

作者：付俊青王聪李玉瑾 School of Mechanical Electronic and Information Engineering CUMT Beijing 100083 China

in this paper, an electromechanically coupled mathematic model of multi-roller driving system for belt conveyor is set up, and the computing equations for dynamic displacement and dynamic tension of the conveyor are also formulated when the hoister is used for straining. Based on the belt conveyor of main inclined shaft in Chengzhuang coal mine, the driving torque, driving power and starting-speed characteristic of each electric motor are studied and measured when multi-roller variable-frequency drive (power distribution 2∶1) is used. The optimal control and the optimal starting-acceleration of the multi-roller variable-frequency drive are determined by a large number of industrial experiments and theoretical calculations.

关键词： belt conveyor multi-roller variable-frequency drive electromechanical coupled mathematic model control characteristic starting-acceleration characteristic

Current Mode Universal Filter Using Single Current Controlled Differential Difference Current conveyor Transconductance Amplifier

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Circuits and Systems 2015年第10期6卷 224-236页

作者： Ajay Kumar Kushwaha Sajal K. Paul Department of Electronics Engineering Indian School of Mines Dhanbad India

This research paper contains a new electronically tunable current-mode biquadratic universal filter using a new active building block;current controlled differential difference current conveyor transconductance amplifier (CCDDCCTA). The proposed filter provides the following important and desirable features: (i) One can use only one CCDDCCTA and two capacitors;(ii) One can get low pass (LP), band pass (BP), high pass (HP), notch (NF) and all pass (AP) current responses from the same configuration without any alteration;(iii) Passive components are grounded, which ease the integrated circuit implementation;(iv) Responses are electronically tunable;and (v) Sensitivity is low. Moreover, the non-ideality analysis shows that the parasitic passive components can be compensated for the proposed circuit. The functionality of the design is verified through SPICE simulations using 0.25 μm CMOS TSMC technology process parameters. Simulation result agrees well with the theoretical analysis.

关键词： Current Mode Analog Filter Universal Filter Current Controlled Differential Difference Current conveyor Transconductance Amplifier (CCDDCCTA) Monte-Carlo Analysis

A comparison of strategic mine planning approaches for in-pit crushing and conveying, and truck/shovel systems

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International Journal of Mining Science and Technology 2018年第2期28卷 205-214页

作者： M.Nehring P.F.Knights M.S.Kizil E.Hay School of Mechanical and Mining Engineering The University of Queensland

In a global environment where energy and labor are becoming increasingly expensive, continuous mining systems such as In-Pit Crushing and Conveying(IPCC) systems have been advanced as offering a real alternative to conventional truck haulage systems. The implementation of IPCC systems in hard rock operations in open pit mines however requires different and more comprehensive planning approaches in order to adequately reflect the practical aspects associated with these. This paper investigates the impact that these approaches may have on the implementation of IPCC systems on a basic metalliferous deposit amenable to open pit exploitation. A strategic life of mine plan to provide numerous economic indicators for each approach is analyzed and compared to traditional truck haulage systems. The mine planning and evaluation process highlights the increased overall resource recovery that may accompany the use of IPCC systems. This investigation also provides insights into the issues associated with IPCC and the scale and type of operation and orebody that is likely to provide a feasible alternative to truck haulage.

关键词： In pit crusher conveyor systems Strategic mine planning Resource recovery Surface metalliferous mining Mine optimization Truck and shovel