离心式压缩机的振动故障分析

介绍了离心式压缩机的振动故障特征，通过对压缩机的振动特征测试，分析振动特征和利用频谱特征求得压缩机异常振动处的频谱，找出振动的原因，并制定了合理的处理方法，彻底地解决了压缩机的振动问题。     

氨制冷螺杆压缩机的振动故障分析与治理

通过对压缩机的振动特征测试,分析振动特征和利用频谱特征求得压缩机异常振动处的频谱,找出振动原因,并制定了合理的处理方法。     

往复压缩机管道振动测试分析

利用PL302双通道数据采集器对某装置4台往复压缩机管道系统进行了振动测试,采用能量分析法发现四号压缩机管道振动最强烈;并着重对四号压缩机管道的振动进行了频谱特征分析,确定了振动的原因是气流脉动引起管系共振,需有针对性地采取减振改造措施。     

6HHE-VE-6型压缩机出口管系振动测试与分析

本文主要介绍应用智能信号采集处理分析系统，对某化肥公司6HHE-VE-6型压缩机出口管系的振动状态进行了现场实测，通过时域分析和频谱分析，得到了该压缩机的振动振幅值和振动的频率成分。同时利用有限元方法对此管道系统进行了结构模态分析，找出了管道剧烈振动的原因，并提出一套减振方案。     

K-5101/A压缩机管道振动分析及改造

针对某炼油厂的一台往复压缩机管网振动十分强烈的情况,通过对管道气体动力特征和管道结构的动力响应的分析,并结合振动测试和频谱分析,找到了管道振动的主要原因,提出了减小压力脉动的方法,并制定了有效的减振措施.管道经改造后振动有明显减小,保障了机组的高效安全运行.     

大型压缩机管道系统振动现场测试与故障分析

为了分析大型压缩机管道系统的振动故障，对某油田大型压缩机管道系统进行了现场测试和现场模态实验。利用振动测试与实验模态分析的方法，得到了压缩机管道系统振动分布情况和关键部件的固有频率、阻尼比和相应的模态振型，评估了管道系统的振动情况，分析了产生振动的原因。所得实验数据和分析结果对大型压缩机管道系统的动态设计、改造、监测与运行管理具有指导意义。     

往复压缩机管道振动测试分析

针对往复压缩机管系的振动进行了测试,得到振动位移数据和频谱特征,计算了该管系的气柱固有频率和结构固有频率,通过分析得到振动原因。并从削减激振力强度和优化管道动力特性两个方面阐述了减振措施。     

基于LMS Test．1ab的压缩机管道振动测试与分析

提出了应用LMS Test．1ab进行往复压缩机管道振动测试的新方法，利用LMS Test．1ab数据采集、分析软件及相关硬件，搭建了往复压缩机管道振动测试系统，对管道系统的固有频率进行了测试，并对测试结果进行了验证，从而证实了本系统的准确性与实用性。     

乙烯超高压压缩机出口管线振动分析及改造

针对超高压乙烯压缩机出口管线发生异常和剧烈振动进行了理论分析和动态测试。通过对现场工作压缩机管线系统的振动测试，利用ANSYS分析软件对管线系统进行模态分析，得出了管线的结构激振频率和固有频率及其振型，找出了压缩机出口管道振动的原因，最后结合现场情况对所有管线进行了合理的改造。     

基于LabVIEW的涡旋压缩机的振动特性分析

利用虚拟仪器技术和频谱分析等信号处理的方法,使用图形化虚拟仪器编程软件LabVIEW及相关硬件产品,完成了涡旋压缩机振动测试系统,通过对涡旋压缩机进行现场采集来的数据分析处理,证实了本系统的有效性.     

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。     

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。     

Hybrid inversion method for equivalent electric charge of thunder cloud based on multi-station atmospheric electric field

This article proposes the hybrid method to inverse the equivalent electric charge of thunder cloud based on the data of multi-station atmospheric electric field. Firstly,the method combines the genetic algorithm( GA) and New ton method through the mosaic hybrid structure. In addition,the thunder cloud equivalent charge is inversed based on the forw ard modeling results by giving the parameters of the thunder cloud charge structure. Then an ideal model is built to examine the performance compared to the nonlinear least squares method. Finally,a typical thunderstorms process in Nanjing is analyzed by Genetic-New ton algorithm with the help of weather radar. The results show the proposed method has the strong global searching capability so that the problem of initial value selection can be solved effectively,as well as gets the better inversion results. Furthermore,the mosaic hybrid structure can absorb the advantages of tw o algorithms better,and the inversion position is consistent with the strongest radar echo.The inversion results find the upper negative charge is small and can be ignored,w hich means the triple-polarity charge structure is relatively scientific,w hich could give some references to the research like lightning forecasting,location tracking.     

虚拟式流体参量集成测试系统及其实现

为了实现对流体参量的自动测量,运用虚拟仪器设计思想,采用组件技术、海量数据存储技术及仪器通用化设计方法,设计并实现了虚拟式流体参量集成测试系统.该系统能同时对流体的温度、压力和流量等进行动态测试.实验室演示表明,该集成测试系统性能稳定,操作简单,功能较强大.     

COMPUTER SIMULATION OF CONTINUOUS ELECTROMAGNETIC STIRRING FOR MAKING RHEOLOGIC SEMI-SOLID SLURRY OF ZL112Y ALUMINUM ALLOY

To realize the technology of fabricating the rheologic semi-solid slurry of ZL112Y aluminum alloy via continues electromagnetic stirring process, ANSYS software was used to simulate electromagnetic force field and fluid velocity field in the alloy melt in a crucible tube in three coils. In the first section of the paper, eletromagnetic force field and fluid velocity field caused by single coil were simulated. The result of this simulation gives an average velocity of 3.2 cm/s and it is called critical velocity because a fluid velocity over it will cause a fine and spherical structure of solid primary a in a semi-solid melt. And, from this result, a reasonable temperature of semi-solid of the alloy and an electrical current intensity were established. The electrical current intensity of the result of this simulation corresponded to the current intensity used in a practice experiment, in which the primary α was obviously refined and sphericized. Based on this simulation of single coil electromagnetic stirring, in the second section of the paper, eletromagnetic force field and fluid velocity field caused by three coils were simulated. The result of the simulation shows that, 1） there is a semi-solid zone of 32 mm from bottom of the crucible tube to the upper; 2） the electrical current intensities of three coils of 400 A, 600 A, and 400 A, which were set to top range, middle range and bottom range of the tube, respectively, were the optimum parameters of electromagnetic current intensity under the condition of this investigation; and 3） under effect of these electromagnetic current intensity, the fluid velocities of the melt in the tube were 6.3 cm/s in top range, 3.75 cm/s in middle range, and 3.9 cm/s in bottom range of it, respectively.     

运用EMD和GA SVM的齿轮故障特征提取与选择

针对齿轮故障特征提取,首先将齿轮箱振动信号进行经验模态分解,得到一组固有模态函数.计算各固有模态函数的能量和矩阵的奇异值,采用Shannon熵和Renyi熵度量能量和奇异值分布,构成原始特征子集.再采用遗传算法和最小二乘支持向量机的Wrapper方法选择最优特征子集.该方法能够利用较少的特征参数集准确判别齿轮故障,提高了齿轮故障诊断的精度与效率.     

基于有限脉冲响应模型的飞机磁场补偿方法

通过分析飞机磁场数学模型,将飞机磁场表示成方向余弦与其乘积项的函数.鉴于模型参数之间存在很强的复共线性,提出了基于有限脉冲响应模型飞机磁场补偿方法.该方法将光泵磁强计和三轴磁强计的输出作为有限脉冲响应模型的输入,由带通滤波器提取信号中的变化成分,再用最小方差估计有限脉冲响应模型参数,并利用有限脉冲响应模型参数计算飞机磁场.从测量总磁场中减去飞机磁场,可得到目标信号磁场数据.最后,通过计算机仿真验证了该磁场补偿方法的有效性.