基于ARM处理器的压力测试系统设计

设计并实现了一种基于ARM7的压力测试系统.整个系统由压力测试模块、ARM7控制器模块、显示传送模块3部分组成.在压力数据信号采集完并经过调理器调理之后,送ARM处理器处理和控制,并通过现场LCD和上位机PC来显示数据.本压力测试系统电路简单、精度好、可靠性高.重点介绍了系统各硬件模块的设计和软件流程.     

基于压缩感知的可视化环境监测系统研究

为了实现更加直观的环境监测,提出一种基于压缩感知的可视化监测系统,以实现图像信号的采集、处理和无线传输.系统将压缩感知理论与无线传感器网络相结合,以STM32F407芯片作为节点的主控芯片,增加OV5640图像采集模块、nRF24L01无线通信模块、红外感应模块等外围设备,实现环境的可视化监测.对系统性能进行测试,测试...     

煤机设备无线自供电状态监测系统

针对当下煤机设备状态监测系统时效性差、通信电缆铺设困难、需要定期更换电池等问题,提出了一种基于无线传感器网络与自供电技术的监测系统设计方法。系统由能量采集模块、无线传感器网络及监测上位机组成,通过能量采集模块收集煤机设备振动能量为节点电路供电,采用无线传感器网络与上位机实现设备关键状态信息的采集、传输与处理。测试结果表明,系统可在30 m有效范围内实现对煤机设备运行状态的实时监测,能量采集模块最大输出功率可达378 mW,能够有效收集设备振动能量实现系统能源自供给。     

基于LabWindows/CVI技术开发虚拟动态应变测试系统

鉴于虚拟仪器技术在机械工程领域具有广阔的应用前景,采用嵌入式MCU控制技术及最新的USB总线数据采集技术设计完成了程控动态应变测试系统.利用LabWindows/CVI软件设计方法,构建出了图形逼真、功能强大的虚拟式动态应变测试系统.该系统的软件含盖如下功能模块:建立标定文件模块,单通道示波模块,多通道示波模块,数据采集模块,历史数据回放功能模块,实现了对应变信号的采集、处理、分析和显示,系统可对多类型参量进行实时测量,将信号的采集和处理一体化,数据和结果实现可视化.同时对仪器功能进行了测试验证实验.     

基于复合振动能量采集器的自供电无线传感微系统研究

工业机械装备的在线实时状态监测和故障预警是保障工业生产安全、提高工业生产效率的重要手段.目前大多数机械装备的状态监测设备都存在体积大、功耗高的问题,并且依赖于电缆或化学电池供电,机动性、灵活性、环境适应性差.本文提出了一种基于复合振动能量采集器的高集成度自供电无线传感监测微系统,设计了压电-电磁-摩擦电三种发电方式复合的能量采集模块采集机械设备的振动能量,通过能源管理电路进行电能存储和整个系统供电.搭建了基于振动-温度高集成微纳传感芯片的环境信号采集及无线传输电路,并进行了低功耗电路设计.系统集成能源管理模块和传感电路模块后进行了采煤机状态监测测试.测试结果表明,该系统能够实时采集煤机装备的振动、温度信号并无线传输给上位机,同时也证明系统内的能量采集模块能够收集采煤机的振动能量并转换为电能带动传感电路模块工作,这将为工业物联网传感网络节点的自供电、无线化发展提供技术支持.     

基于CDMA和无线传感器网络技术的结构状态远程遥测系统

在分析了传统的金属结构应力测试方法的基础上,介绍了1种基于CDMA和无线传感器网络技术的结构状态远程遥测系统,讨论了该系统无线传感器网络节点各组成模块原理和关键技术,实现了基于无线传感器网络的应变数据无线采集和基于CDMA网络的无线数据传输。系统的应用可大幅减少劳动强度,提高测试效率,实现测试的实时性需求,有利于增强结构的安全管理,具有推广应用价值。     

CO2焊机的计算机测试系统的研制

针对当前对CO2焊机电源测试及其焊接过程分析的需要,开发出一套能自动测试弧焊电源性能的系统.通过对焊接过程中电弧电压、电源电流信号进行采集、处理,实现了对电焊机外特性的测试,同时可对焊接工艺性能做出实时评价.该系统具有智能化程度较高、人机界面友好、测试及数据处理功能齐全等特点,为以后焊机工艺技术的提高带来一定的推动作用.     

多通道环境下油样检测光谱分析系统的方案研究

对于光谱仪的信号采集系统的两个关键技术指标是微弱光电信号的处理和多通道数据的同步采集和传输。在分析信号采集的工作原理基础上，结合工程应用，研究了用于直读光谱仪的多通道数据采集与处理系统。基于微弱光电信号的特性和系统性能指标的需求，设计了以FPGA为控制核心、信号调理模块增益可控、多通道数据并行采集、实现数据无损传输的系统总体设计方案。设计了实现数据采集系统各功能模块的硬件电路，以及FPGA对系统各个模块的控制逻辑，并完成系统硬件测试和功能测试。测试结果表明本系统能够采集光电倍增管输出的微弱电流信号。     

基于虚拟仪器的网络化内燃机检测平台设计

介绍了内燃机测试网络检测平台的总体设计方案,探讨了内燃机测试状态参数的选取原则,确定了内燃机检测中的状态参数及其传感器的选型与配置方案.完成内燃机测试的信号调理电路的硬件构建与设计,选用图形化的虚拟仪器软件平台LabVIEW开发了内燃机测试网络实验室的应用软件,整个软件结构由信号采集模块、主控模块、手动测试模块、程控测...     

基于GPS与GSM的车载监控装置

介绍了一种车载运输监控装置。设计了系统的硬件电路,给出了详细的软件流程。本装置以单片机为控制核心,由GPS模块、TC35模块和数据采集系统构成。利用GPS模块实现车辆的全球定位,通过AR-4A型称重传感器以及数据采集系统实现车辆载重的采集,并由TC35模块通过GSM网络将采集的信息发送到监控中心时时监控,实现了超速、超载以及偏离航道的警示功能。     

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.