气垫带式输送机专用风机的试验研究

依据GB1236－85“通风机空气动力性能试验”，GB／T2888－91“风机和罗茨鼓风机噪声测量方法”和GB10178－88“通风机现场试验”，结合气垫带式送机供风系统的性能要求和使用特点，介绍了气垫带式输送机专用风机的空气动力性能试验，噪声试验和现场试验的方法。     

气垫带式输送机专用风机的试验研究

依据 GB 12 36 - 85“通风机空气动力性能试验”、 GB/T 2 888- 91“风机和罗茨鼓风机噪声测量方法”和GB 10 178- 88“通风机现场试验”,结合气垫带式输送机供风系统的性能要求和使用特点 ,介绍了气垫带式输送机专用风机的空气动力性能试验、噪声试验和现场试验的方法。     

气垫带式输送机专用风机的工业性试验

介绍了气垫带式输送机专用风机工业性试验的原则、方法和要求，并以新开发研制的DDF1000-5A专用风机为例进行了介绍。     

全气垫带式输送机

为掌握气垫带式输送机上、下分支的气垫压力、空气消耗量及能耗数据,为设计高速气垫带式输送机提供经验,研制了机长为91m的全气垫带式输送机,进行了工业性试验。介绍了关键部件结构设计,试验参数分析和样机的应用。     

气垫带式输送机主参数的试验研究

本刊一九八二年第九期曾发表了“气垫带式输送机主参数的初步试验”一文,文中简单地介绍了气垫带式输送机静态试验情况、所测得的部分主参数数值及其相互间的关系,现介绍其动态试验情况。     

气垫带式输送机设计与选型要点

近年来,气垫带式输送机已逐渐在粮食、煤炭、电力及水泥等行业得到应用,生产厂也日益增多。为使广大用户及设计人员能正确设计和选用气垫带式输送机,现就笔者的设计经验介绍一些在设计选用中应注意的问题,以供参考。１气垫带式输送机的特点气垫带式输送机是由通用带式...     

气垫带式输送机导料槽的结构分析

气垫带式输送机以其输送量大、运行平稳及便于密封输送等优点,倍受粮食输送行业的青睐。在设计气垫带式输送机时,应首先考虑其功率及风机配置是否合理,良好的导料和防跑偏性能也是该机成功运行的重要因素。避免在导料和防跑偏方面少出误差,关键在于导料槽的设计。与导料槽有关的环节对气垫带式输送机的运行有举足轻重的作用,本文专门对粮食系统气垫带式输送机导料槽的结构进行探讨。     

浅谈气垫带式输送机的压力参数

本文针对气垫带式输送机的气垫压力，气室压力这两个主参数从理论上进行了深一步的推导和分析，得出合理的结论。     

气垫带式输送机工业性试验鉴定

由机械部矿山局委托北京起重运输机械研究所主持的气垫带式输送机工业性试验鉴定会于1985年4月5～8日在太原召开,有16个单位的24名代表参加会议,代表们在听取了安装使用、测试情况介绍后到现场参观,并认真进行讨论。他们认为:1)气垫带式输送机的研制是一项开发性技术,试验样机所选用的主参数基本合理,它为今后进一步研制、生产气垫带式输送机提供参     

气垫带式输送机的气垫流场特性研究

气垫带式输送机在运行过程中普遍存在输送带与盘槽之间的气膜不均匀问题，为此，对带式输送机气垫流场特性进行了仿真分析研究。首先，根据受力平衡原理对气垫压力进行了理论推导，并给出了气垫压力理论分布表达式和曲线图；然后，通过构建气孔周围气体流动模型，推导出了气孔附近流场的压力以及速度分布，通过构建横截面气体出流模型，推导出了气垫沿横截面出流的速度及压力分布；最后，采用流体动力学分析软件Fluent对气垫场进行了仿真分析，并研究了不同气孔流速、气孔排列方式以及气垫厚度对气垫流场特性的影响。研究结果表明：带式输送机气垫压力随着气垫厚度的增加而减小；气垫承载力与气孔流速呈线性关系，线性比例K=41.57;最佳气孔排列设计参数为孔径7 mm,孔距75 mm;在气垫厚度为3 mm～5 mm时，气垫刚度随气垫厚度的增加而减小。     

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...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

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。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

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%.