基于巴特沃斯滤波器的舰载转速采集电路设计

为了提高舰载设备的转速采集精度与抗干扰能力，保障舰船设备的安全稳定运行，采用巴特沃斯滤波器设计了一种能够实时高精度检测接近开关传感器输出脉冲信号并对输入接线断线状态进行实时检测的电路。分析了转速采集电路、巴特沃斯低通滤波电路、断线检测电路的原理与设计方法。通过转速采集电路实现了接近开关输出脉冲信号的实时采集，通过三阶巴特沃斯滤波器滤除了输入信号中混杂的高频干扰信号，同时传感器断线检测电路可以实时判断传感器输入通路的断路状态。仿真及实测结果表明，所设计的转速采集电路性能稳定，精度较高，抗干扰能力强，对比传统转速采集装置更加可靠，可进一步推广应用到需要精确可靠监测旋转设备转速的复杂环境场合。     

一种新型柴油机测试仪的研制

文章介绍了一种新型柴油机测试仪。该仪器只有两种传感器，采用基于单片机的数据采集箱高速采集柴油机瞬时转速和油管压力信号，使用便携式电脑通过并行接口以EPP协议进行数据采集控制和分析，以实现对柴油机工作状态的现场检测与不解体故障诊断。     

乘用车发动机曲轴位置传感器的工作特性

借助小波对小排量TU5JP4发动机ECU控制转速系统中磁感式曲轴位置传感器进行了转速工作稳定性分析。首先,对曲轴位置传感器测转速失效问题,提出在同一信号轮上布置两个曲轴位置传感器以提高曲轴位置传感器工作稳定性方案。之后,基于小波变换信号突变点检测的融合滤波算法,用该算法对采集到的两组曲轴转速信号作融合滤波处理。结果表明,该算法能有效检测到曲轴转速传感器是否符合失效模式,并能有效滤掉周围噪声和震动,得到曲轴位置传感器采集转速数据稳定性的一种方法。     

基于LabVIEW的电机转速转矩测量系统设计

传统的电机性能参数测量系统一般以单片机为核心,包含用户接口、输出显示等功能,但这些产品都是以硬件为核心,使得与用户的交互和功能的修改都很不方便。现基于Lab VIEW软件平台,设计一个电机转矩转速测量系统,利用JN338转矩转速传感器检测电机驱动控制系统的转矩、转速信号,然后利用DAQ数据采集卡采集从JN338转矩转速传感器出来的转矩、转速信号,并利用Lab VIEW软件对测量的信号进行计算处理,得出实际转矩、转速大小及波形;另外,测量系统界面设计十分人性化。     

配电线缆自动化加工装备及其控制系统设计

介绍了基于PLC控制的配电线缆自动化加工装备及其控制系统。系统主要由导线牵引机构、导线切断机构、导线剥皮机构和端子自动压接机构组成,PLC控制器采集各个传感器信号,对各个机构进行时序控制;导线牵引机构采用大扭矩伺服电机驱动,通过加装增量式编码器来计量导线牵引距离;采用液压式断线机构提高断线效率;采用回转切割自动剥皮方式,彻底解决作业过程中的绝缘皮无法自脱落的问题;借鉴标准工业化装配理念,设计端子自动压接机构,实现端子压接自动化,作业过程无需人工辅助。系统最终实现了配电线缆自动化加工,满足工业化生产需求。     

电喷柴油机启动困难故障的处理

我单位有两台美国卡特公司生产的D10R型推土机,使用中有一台出现了启动困难、作业时发动机转速及动力大幅度降低的现象。 该推土机采用的是V12液压电子控制单元喷射柴油机。这种电喷柴油机主要由电子控制单元ECM、油门控制器、油门开关、速度/正时传感器、温度传感器、压力传感器、喷油器和液压供油泵组等部件构成。电子控制单元ECM是发动机的核心部件,实现调速、正时及燃油限定等功能,同时通过卡特数据线读取传感器信号并与仪表显示系     

液压工程夹持器压力自适应电液比例控制

为了解决传统挖掘机铲斗吊装效率低、低适用性等问题,设计了一种基于压力自适应的新型挖掘机液压工程夹持器。完成了液压系统原理图的拟定,利用电液比例控制技术调节回路压力,采用光电位移传感器采集物体滑移信号,根据OPC技术实现HMI与PLC的通信,用VB程序事件驱动机制实现信号的检测,分配了PLC输入输出点,编写了PLC压力自适应控制程序。简化了控制系统硬件驱动设计,能够根据滑移信号实时调节系统压力,抗干扰能力强,具有良好的压力自适应能力。     

基于PLC速度感应可折叠手机壳的控制系统设计

研究速度感应可折叠手机壳结构,并分析其工作原理,采用PLC对速度感应装置系统进行信息监测采集,分析比较传输系统和控制板上的信息,实现了PLC反应装置的触发、折叠装置的伸缩和弹出功能。具体地,基于PLC的控制系统速度传感器处于待机检测状态,实时检测速度的变化,从而确定手机所处的状态,当手机下落时瞬间产生较大的速度;速度传感器将测量数据的速度值转化为电信号反馈到数据分析处理系统,PLC对手机下落时的速度和设定的初值进行比较;下落速度的数据超过额定值时,PLC控制系统处理速度传感器的信号值,发出指令触发折叠反应装置;折叠机构迅速反应,使正反8个"蛛爪"迅速弹射、快速反应、"蛛爪"触地,从而起到避免手机本身触地的保护作用。     

基于柴油机瞬时转速的时频域滤波的研究

在柴油机故障诊断的研究中,对采集到的瞬时转速信号进行滤波处理是必须的。文章首先对信号进行了预处理,去掉发生错误的数据,然后对瞬时转速信号分别进行了时域滤波和频域滤波。时域中采用FIR滤波器进行滤波,对不同截止频率的滤波效果进行了比较分析并确定最优;频域滤波中引入全相位滤波思想,在频域内使用频率向量改变瞬时转速信号的频率特性,并在时域内观察滤波效果并进行了分析。时域滤波能达到比较好的滤波效果,但同时也产生了相移;频域滤波效果较时域滤波来说更为平滑、真实,没有相移。     

楼宇智能控制系统的设计与仿真

楼宇智能控制系统是由中央管理站、各种DDC控制器及各类传感器、执行机构组成的,是能够完成多种控制及管理功能的系统。该系统主要由单片机接收主机发来的信号并进行处理,可开启相应的家电设备;通过红外传感器检测用户家里是否有盗贼出入,通过烟雾传感器检测家里是否有煤气泄漏和火灾发生,同时可以采集家里的温度和电压信号;可采用虚拟串口、PROTEUS和keilC软件对其进行联合仿真和调试。     

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.