机场行李输送设备管理及节能改造

随着我国市场经济的快速发展,航运机场作为重要的运输保障机构,其重要性不言而喻。从机场行李输送设备管理及节能改造入手,结合可编程逻辑控制器(Programmable Logic Controller,PLC)技术,对机场行李输送设备进行完善设计。结合行李输送设备实际状况,详述节能改造的方法步骤,为机场运输安检及提升服务效能提供支持。     

PLC控制系统在机场行李分拣系统中的故障诊断及处理研究

利用PLC控制系统具备的编程简单、通用性强、可靠性强等优势,对PLC控制系统在机场行李分拣系统中的故障诊断及处理进行了研究。通过构建基于PLC控制系统的机场行李分拣框架,利用PLC控制系统对分拣信息的层次划分,识别故障信息,同时做出报警显示。根据行李传送过程中出现的故障和系统自身输入模块故障,提出了对应的处理方法,提高了机场的经济效益。     

电动行李牵引车动力参数匹配与车架设计

车架担负着支撑整部汽车、安装汽车上的动力和电力系统等附件以及承受行驶时各种复杂工况所引起的载荷等任务,而电动汽车与燃油汽车的车架的配载方式及结构又有很大不同。根据民用航空机场货物行李运输特点提出了一种新型的大牵引力行李牵引车,对其动力参数进行了设计匹配。先运用Solid Works建模软件对行李牵引车车架进行了的三维实体建模,再运用Hyper Mesh软件进行有限元前处理,利用ANSYSY软件对所设计的车架进行静态强度分析、模态分析。根据分析结果对车架结构进行了优化。     

机场行李智能搬运系统的设计

针对目前机场行李处理“最后一公里”的问题,研究设计了一种机场行李智能搬运系统。首先阐述了机场行李智能搬运系统的研究现状,其次详细阐述了所设计的行李搬运系统的结构和工作原理,然后利用ANSYS有限元分析软件对机械手指的应力和变形进行了分析,结果表明,所设计的机械手指结构合理,能够满足抓取行李的力学性能要求,最后总结了行李搬运系统的优势,并对其应用前景进行了展望。     

在胶带运输系统中自动化控制程序的应用与作用探究

随着我国经济的发展和科学技术的进步,胶带传输系统广泛应用于煤矿运输、港口运输等行业.正式因为浇带运输系统的应用广泛,而胶带运输控制运行种类也多种多样,因此切实根据实际情况的需要选择稳定可靠安全的控制系统,对于提高胶带运输效率,保证煤矿、港口等的安全生产顺利运转有着非常重要的意义.PLC可变控制程序以其高效性、稳定性、智能化以及安全性等特点,是胶带运输系统自动化控制程序的最佳选择.本文以煤矿胶带运输系统为例,分析了PLC自动化控制程序在胶带运输系统中的应用,并且对作用与优势进行了分析.     

五亩冲矿皮带运输系统控制改造

从传感器、PLC集中控制技术等方面分析了五亩冲矿技改后的皮带运输系统,在遵循皮带运输原理的基础上,总结了PLC技术下煤矿皮带运输系统改造优势,以期为煤矿皮带运输系统的改造工作提供参考。     

煤矿井下带式输送机自动控制系统改进设计研究

针对山西焦煤集团介休正益煤业有限公司就西胶带大巷一采区带式输送机自动控制系统进行的升级改造,从硬件设计、软件设计两方面详细分析该系统的改进设计方案。该系统是以PLC为基础开发的井下运输系统控制装置,实现了对带式输送机的多要素监测,可有效改善煤炭运输质量及效率。     

基于PLC控制的皮带输送机系统的研究与实践

根据某煤矿运煤皮带控制要求,引入PLC控制系统,并通过PLC控制系统硬件和软件部分的设计,构建皮带运输的PLC集中控制系统,最后给出PLC控制系统抗干扰措施。通过PLC控制系统的应用,提高皮带运输效率,为提高企业经济效益奠定基础。     

基于Montrac+PLC的机器人自动化装配生产线控制系统的设计

针对自动化生产线上存在的UPH偏低的问题,一个以提高产品稳定性、大量缩减劳动成本为目的的智能化、自动化生产线控制系统的应用显得格外重要。对机器人装配生产线系统的硬件设计进行了阐述,该系统以PLC作为控制核心、选取触摸屏作为控制系统的输入设备,采用Montrac调度技术实现灵活的自动化运输系统。针对PLC及其附加模块SM1221/SM1223的选择进行详细讨论。最后将PLC三个功能块的软件功能和设计做了详细的介绍。     

基于PLC的控制系统设计方法研究

分析了影响PLC控制系统的主要因素,对PLC控制系统从原理、实现方式等方面进行了分析和比较。这些设计方法对提高PLC控制系统可靠性有重要的参考价值,并从硬件和软件两个方面进行了具体的设计研究。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.