后装式压缩垃圾车的液压系统及PLC控制系统设计

国内后装式压缩垃圾车液压系统的控制大多数采用手动和遥控器操作,存在劳动强度大,工作效率底,性价比低,而且容易发生因误操作而导致的垃圾车部件损坏和人身事故等缺点。介绍了一种液压系统及PLC控制系统的设计可有效解决上述问题,并有助于提高我国垃圾车的自动化水平。     

纯电动压缩式垃圾车上装系统的节能研究

目前,纯电动压缩式垃圾车的生产厂家并未针对纯电动车底盘的特性改进设计上装控制系统,仍然沿用了传统燃油环卫车辆的液压泵恒速驱动控制方案,导致纯电动车的底盘优势未能充分发挥。通过对纯电动压缩式垃圾车上装液压系统的能耗进行分析,提出了根据具体工况来调节电机转速的控制方案。首先建立纯电动压缩式垃圾车上装液压系统的AMESim仿真模型,采用三次垃圾装载之后进行一次压缩的作业模式,对不同的装载时间间隔进行仿真。仿真结果表明:原方案下,上装系统作业能耗随装载间隔时间延长而增加,而在新的改进方案下,作业能耗与装载间隔时间无关,作业效率得到了提高。     

中频加热弯管机及其PLC控制

介绍了一种由液压驱动、可编程控制器控制的中频加热液压弯管机.该文对其工作原理、液压系统以及PLC控制系统等方面进行了介绍,并阐述了该机的性能特点.控制系统采用了可编程控制器和人机界面,提高了系统的可靠性及其柔性,增强了机床的抗干扰能力.     

PLC在液压提升机系统中的应用探究

近年来,随着PC和PLC视频监控技术和比控制技术的应用,将液压提升系统的控制和检测精度得到了显著的提高,有效地降低了控制系统的成本,同时在控制系统的大小和可靠性等方面均有显著的改进。PC和PLC视频监控技术和比控制技术通过良好的人机界面,提高了操作员控制全局、掌握现场等能力,也为液压提升系统的网络化发展奠定基础。     

基于PLC的销齿翻车机控制系统

采用PLC对销齿翻车机液压系统进行控制,实现了液动销齿翻车机、制动器。阻车器、推车机的自动化运行,提高了现代化矿井的控制程度。控制系统运行稳定可靠,操作简单,维护检修方便,实用价值高。     

基于STM32控制的水冷壁爬壁机器人的气动检测系统的研究

为实现工业高空智能化检测,设计了一种磁吸附履带式爬壁机器人,并在此载体上采用分级控制。其中,下位机使用ARM Cortex-M3为内核的32位微控制器驱动比例阀,从而控制气缸气体流量,由采用位移传感器检测移动量并反馈,同时控制系统采用专家PID控制算法,实现对锅炉水冷壁磨损检测机器人的气缸位置定位;上位机对检测结果进行实时监测,并进行处理分析。实验仿真证明该算法提高了系统的气动装置的定位精度,并且结合上位机友好的人机交互界面,有效提高检测效率,使其具有较高的智能化水平。     

液压支架自动化智能化跟机控制系统探析

为使液压支架实现自动化和智能化跟机,介绍了液压支架跟机控制原理,分析了跟机过程中现存问题,并设计了跟机控制系统。通过在晋煤集团试验该跟机控制系统,结果表明应用该液压支架跟机控制系统,能使液压支架实现自动及时跟机,有助于促进综采工作面实现无人化开采。     

实验室液体压力控制系统的模型识别

近年来电子计算机与液压技术的结合已渐趋广泛。国外如西德等已广泛地应用计算机防真技术,利用计算机来模拟各种阀、泵、马达及液压系统的工作情况。西欧各国还广泛地采用计算机作实验数据处理和在线控制,流体动力控制系统的计算机辅助设计等。最近,我们利用JS-10A机对液压试验室中的压力控制系统进行模型识别,即用JS-10A机实测压力控制系统的脉冲响应曲线,编制了计算机拟合程序,拟合出该系统的传递函势并进行校核。     

起重机液压平衡阀检测系统开发

从检测液压系统、控制系统和基于MCGS的平衡阀监控系统三个方面,介绍了利用PLC、MCGS组态软件、触摸屏等进行起重机液压平衡阀检测控制系统设计开发的过程.实验表明,所开发的检测控制系统具有操作简单、运行可靠、界面直观等优点,对类似检测设备的开发具有良好的借鉴作用.     

混合动力汽车底盘液压控制系统集成化诊断方法研究

底盘液压控制系统是混合动力汽车底盘域中关键的系统，针对混合动力汽车底盘液压控制系统故障诊断精度下降，故障诊断覆盖率过低的问题，在混合动力汽车底盘液压控制系统结构和集成化诊断拓扑结构基础上，构建了关键部件的精细化模型，采用分段故障阈值方法对底盘液压控制系统进行故障检测，并对故障检测结果进行防抖处理，在构建的混合动力汽车底盘液压控制系统故障模拟实验平台进行故障注入试验，实验结果表明，所采用的故障诊断方法能够提高故障诊断速率和覆盖率，确保故障诊断精度。     

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.     

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。     

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.     

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。     

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.