基于虚拟仪器的污水水质在线监测系统

为了监测生产和生活中的污水排放情况,通过对虚拟仪器的介绍,应用LabVIEW软件稳定快速地对污水的流量、液位、温度、pH、BOD、COD、TOC、TOD、氨氮和总磷等各个参数进行基于无线网络的数据采集,然后在数据中心进行实时显示和综合分析,为污水水质的在线监测提供了一整套完整可靠的系统.经测试,系统运转良好,达到了预期...     

圆度圆柱度测量虚拟仪器中的步进电机控制

构建了控制系统以LabVIEW作为软件开发平台,包括ADLINK PCI-8134运动控制卡、Leetro DMD 402A步进电机驱动器、带有Leetro DM4240A步进电机的工作台的控制系统。该系统通过利用ADLINK PCI-8134发出步进脉冲信号PUL和方向电平信号DIR来分别控制步进电机转过的角度和方向,实现步进电机的正反转以及电机运动过程中的加速、匀速和减速,从而完成工作台Z轴滑块沿被测工件表面的径向运动、X轴滑块沿被测工件表面的轴向运动和主轴的回转运动,辅助实现圆度和圆柱度检测。     

基于小波神经网络的矿用通风机监控及诊断系统

采用小波与神经网络松散结合的方法,选择LabWEV为软件开发平台,开发出了一套集数据采集、处理、显示、故障诊断、报警等功能的实时监测及诊断系统。该系统能准确地监测风机运行状况,并有效地诊断风机发生的振动故障。     

基于LabVIEW的批量伽马数据处理及优化

嫦娥一号携带的伽马谱仪主要用来探测月表元素的特征分布.然而,探测所获得的数据量极其庞大,仅2C数据就有28.9 Gb;并且,伽马数据的处理过程也比较复杂,需要进行筛选、校正、平滑、扣本底、解谱、反演、成图等一系列处理,在运行时会出现耗时较长、内存占用过多、甚至系统崩溃的情况.因此,基于LabVIEW平台,从运行效率、内存消耗、程序规范3个方面对程序优化,以保证处理程序的高效运行.     

Magneto-transport properties of Fe-doped LSMO manganites

Magneto-transport measurements have been performed on La_0.67Sr_0.33Mn_1−xFe_xO₃ (x = 0.0, 0.05 and 0.07) manganites synthesized by solid state route. The overall nature of AC susceptibility is found to be frequency independent. With the substitution of Mn by Fe, the transport properties dramatically change suppressing the double-exchange interaction. This in turn weakens the ferromagnetism and consequently decreases the paramagnetic to ferromagnetic transition temperature (T_c). However, DC electrical resistivity of the samples show board hump at metal-insulator transition temperature (T_MI) in contrary with sharp transition at T_c and T_MI < T_c indicating decoupling of electrical and magnetic properties. Resistivity behavior of these samples can be well explained by the consideration of bond percolation model which is basically developed from effective approximation method.     

Measurement system for wind turbines noises assessment based on LabVIEW

An automatic measurement platform based on powerful LabVIEW is designed and implemented for noise assessment of Wind Turbine Generator Systems (WTGS). The measurement method of IEC 61400-11 standard is set-up in order to ensure the consistency and accuracy of noises assessment. Firstly, the techniques of measuring wind speed, calculating apparent sound power at integer wind speed, identifying tonality and audibility at integer wind speed recommended in IEC 61400-11, are described briefly. And then, the measurement system is designed using LabVIEW development system with one PCMCIA card and one USB card inserted into a laptop. The whole system architecture with the hardware configures and software function modules, is introduced in detail. Finally, this system is applied to do noises assessing for GOLDWIND 77/1500 wind turbine and the results have been recognized by the authoritative agency of MEASNET. Benefiting from the module design of sub-virtual instrument in LabVIEW, this system has the characteristics of perfect functions, friendly using interface, high integration, low cost and great practicality. It has wide foreground for noises assessment of WTGS.     

基于虚拟仪器技术的辅助制动实验台测控系统研究

应用PXI系统和LabVIEW软件搭建了静动液辅助制动实验台测控系统.该系统能够对转速、转矩、压力、温度等多路传感器信号进行数据采集、处理、显示与记录,并实现对电磁离合器、电磁阀、变量柱塞泵等强电设备的自动控制.设计了基于逻辑门限的系统控制策略,将系统运行状态限制在安全工作范围内,并在控制系统加入了手动控制项,提高了测...     

EMD的LabVIEW实现及其在滚动轴承故障信号分析中的应用

通过对图形化编程软件LabVIEW的二次开发实现了经验模态分解(EMD)算法,为利用LabVIEW构建振动信号分析系统提供了有利分析工具。根据滚动轴承故障产生机理和故障信号的振动特点,将此方法运用到对轴承故障信号的分解上,对分解出的高频本征模函数(IMF)做包络解调从而提取出故障信息,并通过对实际故障轴承数据的分析验证了此方法的有效性。     

基于LabVIEW的汽车电子油门踏板测试系统研究

简要介绍了基于虚拟仪器图形化语言LabVIEW开发的汽车电子油门踏板测试系统。系统采用高精度力传感器与位移传感器进行前端数据采集,在计算机控制下实现了对汽车电子油门踏板的动态数据采集,在显示器上生成即时的力-位移、电压-位移、接触电阻-位移等多条曲线以及其他诸多参数的测试结果,同时实现了LabVIEW环境下大量测试数据的数据库管理,对不合格的踏板自动进行声光报警。     

基于LabVIEW的两种有功功率算法的比较与实现

针对某型飞机电气参数测试系统,研究并设计了有功功率的两种测试方法.一种方法是传统的离散积分方法,另一种方法是针对电压过零点扰动大的补充方法即频谱分析方法.系统软件采用NI公司图形化编程语言LabVIEW2009作为软件开发工具.通过试验验证,表明两种测试方法可行,测试结果可靠,达到了设计要求.