Design on Vibration Monitoring and Fault Diagnosis System of Large Water Pump Motor

Large water pump motor,whose operation decides the reliability of the whole production line,plays a very important role.Therefore,its online condition monitoring can help companies better know its operation,process fault analysis and protection.The essay mainly studies and designs large water pump motor′s real time vibration monitoring and fault diagnosis system.The essay completes the systems project design,the establishment of the system and performance test.Eddy-currentsensor,XM-120 vibration module,XM-320 axial translation module,XM-362 temperature module,XM-360 process amount module and XM-500 gateway module are used to measure the axial vibration and displacement of main motors.Laboratory tests prove that the system can meet the requirements of motor vibration monitoring.

An Experimental Study on Microcomputer Control of Pump Controlled Motor Systems

Pump controlled motor electrohydraulic servo systems are much used in circumstances where high power drive is needed. This kind of system has the advantage of energy-saving. But, it also has some defects that have to be improved. Microcomputer control of a pump controlled motor electrohydraulic servo system is studied. A PID controller is first adopted on the closed loop control system, and experimental results are obtained. Then, a model reference adaptive controller is designed and realised on the same system applying a single board microcomputer. Experimental results show that the dynamic properties of the adaptive control system is much better than those of the PID system under different inertia load conditions.

Lubrication characteristics of external return spherical hinge pair of axial piston pump or motor under combined action of inclination and offset distance

External return mechanism is a mechanical structure applied to axial piston pumps.To study its lubrication characteristics,the Reynolds equation applied to an external return spherical hinge pair was deduced based on the vector equation of relative-motion velocity of the external return spherical hinge pair under the influence of external swash plate inclination and offset distance.The results show that the total friction,axial leakage flow,and maximum value of the maximum oil-film pressure increase with increasing pump-shaft speed and decrease with increasing offset distance in one working cycle when the external-swash-plate inclination is constant.However,the varying offset distance has little effect on the axial leakage flow.The maximum value of the maximum oil-film pressure decreases with increasing external-swash-plate inclination and the total leakage flow increases with increasing external-swash-plate inclination in one working cycle when the offset distance is constant.It can be seen that the abovementioned parameters are important factors that affect the lubrication characteristics of external return spherical hinge pairs.Therefore,the complex effects of different coupling parameters should be comprehensively considered in the design of the external return mechanism.

LMI Approach to Robust H_∞/H_2 Controller Design with Regional Poles Constraint of a Pump-Motor System

The time domain guideposts requirements of a pump-motor system is transfered into a series of constraints which express the robust performance upper bound and regional poles limits of the closed loop system. Then the servo system control problem is transferred into the problem of robust performance optimizing under regional poles constrains described by linear matrix inequality （LMI）. These LMIs are easy to solve through the Matlab LMI-toolbox. Simulations indicate that the controller has excellent dynamic, static and disturbance rejection performance, and the control system is robust and has perfect H2 performance to the bounded external torque disturbance.

STUDY ON POWER SPARE COEFFICIENT OF ELECTRICAL MOTOR IN LARGE PUMP STATION BASED ON RELIABILITY

Characters of head of low head pump station and the pump shaft power areanalyzed. Influence of each single factor on pump shaft power is expressed as change of specificshaft power. (non-dimensional) and the probability density function is determined. Influences ofmultiple factors on pump shaft power are analyzed. Method of calculating none over-loadedprobability of motor by integration by successive reductions is put forward and then relationbetween power spare coefficient and none over-loaded reliability of electric motor is established.Influences of all factors on pump shaft power being considered completely; power spare coefficientsof motor are calculated in three kinds of heads (changing and unchanging), two kinds of dirty-outconditions. Electrical motor power spare coefficients should be chosen as 1.20 approx 1.44, 1.11approx 1.19, 1.09 approx.14 respectively when pump heads are 4, 7, 9.5 m. The results mean much toreasonable choose of electrical motors in large pump stations, increasing reliability of pump unitsand saving equipment investment.

LQ Speed Control of Pump Controlled Motor System

A linear quadric (LQ) optimal speed control algorithm is proposed for the speed control of a pump controlled motor hydraulic system. The control theme consists of optimal state feedback and disturbing compensation based on observation. The optimal state feedback bases on LQ cost function. The disturbing compensation is realized through reconstructing the state of load torque. A series of simulation are performed, and the results show that the control performance is satisfactory and can be maintained under changes of load torque.

Dynamic Modelling of Submersible Pump Based Solar Water-Pumping System with Three-Phase Induction Motor Using MATLAB

The main purpose of this paper is to design and model a water-pumping system using a submersible multi-stage centrifugal pump driven by a three-phase induction motor. The system is intended for pumping water to the surface from a deep well using three power supply systems: a general network, a photo-voltaic (PV) system, and a PV system with a battery bank. These systems are used to compare two three-phase induction motors—namely, a motor with a drive and another one without a drive. The systems dynamic models are simulated in MATLAB/Simulink and the results compared with the manufacturer’s data for validation purposes. The simulation results generally show system dynamics and expected performance over a range of operation.

双馈变速抽蓄机组关键技术及展望

双馈变速抽蓄机组不局限于额定转速运行,已成为抽水蓄能领域的新方向和研发热点。介绍了双馈变速抽蓄机组的社会需求和国内外发展现状,概述了双馈变速抽蓄机组的原理并总结了其特点。结合双馈变速抽蓄机组的特点对其典型应用场景进行了分类;对变流器技术、控制技术和机组设计及制造技术等双馈变速抽蓄机组关键技术的研究现状和主要问题进行了梳理;并对双馈变速抽蓄机组未来的发展进行了思考与展望。

拖拉机液压机械无级传动系统液压泵马达全工况效率模型研究

未来拖拉机传动系统发展的主流技术之一是液压机械无级传动技术(CVT),其核心部件液压泵马达的效率特性对CVT总体效率和动力学特性的研究至关重要.针对目前液压泵马达效率经验模型研究中存在的效率预测准确性不高、缺少内部摩擦副功率损耗分析以及有限元效率模型计算时间长等问题,提出了一种基于损失机理的半经验全工况效率模型,满足快速准确的液压泵马达效率评估.根据柱塞泵系统参数的非线性变化规律,建立功率损失预测的半经验模型,利用试验数据对复合参数进行识别,推导得到完整的液压泵马达效率模型.试验数据表明,半经验全工况模型的平均相对误差为6.36%.分析仿真结果可知,液压泵马达效率在高、低压差区域分别主要受容积和机械损失影响,在极限工况下效率难以提升主要由流量泄漏、可压缩容积损失和库伦摩擦损失导致.保持液压泵马达在中高排量区域运行、避免低压高速工况有利于提升液压泵马达效率,进而提升CVT整机传动效率.

一种用于掘锚机的紧凑型泵站

掘锚机的紧凑型泵站,包括油箱、电机泵组、油温油位传感器、液位计、注油组件和回油过滤器。油箱按高度不同分为高部和低部两部分,电机泵组布置在低部的上方,油温油位传感器、注油组件和回油过滤器布置在高部的顶面上,液位计布置在高部的侧壁上。泵站长度明显减小,能为掘锚机的其余结构节省出可观的安装空间。

伺服电机驱动变量柱塞泵试验台研发

针对伺服电机驱动变量柱塞泵的控制研究,对相关试验平台进行设计,根据控制方案对液压系统和电气系统硬件进行了搭建;利用PLC编程软件,开发了用于控制输出的程序以及用于部分传感器数据采集的程序。同时,在LabVIEW平台上编写了包括控制逻辑、PID控制算法以及数据采集的程序,形成了适用于试验平台的上位机用户界面。通过OPC通信协议实现了PLC与LabVIEW之间的数据交互,确保了控制系统的完整性和协同工作能力。

基于STM32单片机的喷涂气泵智能控制系统

本文主要探究了一种基于STM32单片机的智能模型喷涂气泵控制系统的设计与功能实现。控制系统的软件部分主要包括主控程序、用气时长检测程序、净上气速率检测程序、独立风扇控制程序等。单片机接收并处理用气时长和净上气速率信息,通过模糊控制算法输出直流无刷电机(BLDCM)的调速控制信号,进而改变电机转速实现气泵上气速率和工作噪音调节。同时,对电机温度进行实时检测,通过线性控制算法控制散热风扇转速,对气泵电机进行高效散热。

基于区块链的抽水蓄能电站发电电动机运行监测数据存储方法

针对监测抽水蓄能电站发电电动机运行数据存在冗余问题,致使存储数据延迟时间长,提出基于区块链的抽水蓄能电站发电电动机运行监测数据存储方法,通过存储数据身份验证维护存储数据安全。数据层运用数据采集平台获取抽水蓄能电站发电电动机运行监测数据,采用变更数据捕获(change data capture,CDC)算法消除采集数据冗余,并通过发送终端将消冗后数据传输至分布式存储层;分布式存储层的区块链按时间戳的顺序确定数据区块的存储顺序,通过身份注册验证待上传的数据身份;分布式存储数据库采用HBase技术对通过身份验证数据进行多维排序映射存储;通过应用层客户端展示存储结果并提供数据共享服务。实验结果表明:该方法的数据消冗效果较好,可实现电动机运行监测数据存储,且存储数据延迟时间短,上传数据时的身份注册开销比较稳定,可保障存储数据安全。

一种轴流式磁悬浮心脏血泵驱动电机优化设计

为提高人工心脏泵的工作性能和稳定性,以一种轴流式磁悬浮人工心脏泵作为研究对象,设计优化了一种适用于心脏泵的永磁无刷直流电机。采用有限元仿真软件验证了该电机的性能符合设计要求,并通过对比分析的方法对其齿槽转矩和起动特性进行了研究。仿真结果表明:该心脏泵驱动电机对比传统驱动电机齿槽转矩减小了约11.7%,并且电机具有良好的起动特性,有效提高了心脏泵的工作性能和稳定性,为轴流式磁悬浮人工心脏泵驱动电机的研制提供一定的指导作用。

Submersible direct-drive progressing cavity pump rodless lifting technology

Submersible electrical motor direct-drive progressing cavity pump (PCP) rodless lifting was studied to solve the traditional rod-drive pump problems, such as rod-tubing wearing, low efficiency and short running time. The theoretical researches and laboratory experiments of key tools such as submersible motor and the construction technology of lifting system were introduced. The field application and economic benefit were analyzed and compared with the traditional rod pumping unit. A new low speed and large torque permanent magnet synchronous motor was developed. This motor was used to drive PCP without gear reducer, which improved the reliability and feasibility. It can run at the speed from 50 to 500 r/min with stepless speed regulation, and it can perform high efficiency and large torque. Besides, other key supporting tools, such as motor protector and flex shaft, were developed. The submersible electrical motor direct- drive PCP technology can be used in a 139.7 mm (5.5 in) casing well, with daily output ranging from 5 to 50 m3. Until now, the technology has been deployed more than 100 wells. The field application results show that it eliminates the rod-tubing wearing and saves electric energy by more than 30% compared with the traditional rod pumping unit. And it also makes the oil produced in a safe and environmental friendly way.

PV-Grid Tie System Energizing Water Pump

This paper presents the behaviours of three-phase induction motor driving centrifugal pump under various solar irradiation levels, where the motor speed and torque depend on the source voltage and frequency, while the water-flow rate depends on the motor speed, density, and static head according to affinity flow. Matlab/Simulink model is proposed for studying the behaviours of these machines with respect to water flow capacity, motor current, electro-magnetic torque, and motor efficiency. The proposed photovoltaic with maximum power point tracking model based on observation and perturbation (O&P) maximum power tracking model is applied. The output voltage is regulated throughout Buck-Boost converter with purpose maintaining the output voltage at predetermined values. Since Induction motors are widely used in pump systems, the electromagnetic torque, water-flow rate are studied for various source frequencies. Comparison analysis is conducted for both motors with respect to water flow-rate, heads elevation, and motor current. In addition to that, the proposed system presents Photovoltaic-Grid (PV-Grid) Integrated model, where the power shortage required for normally operation of the pump is drawn from the electrical grid.

The Design of a Mobile Phone-Based Remote-Control Application to Submersible Motor for Effective Water Supply

In the last few decades, several monitoring systems integrated with water level detection have been the major research focus. Production boost and its sustainability depend mainly on sustainable water supply, measuring water level, and avoiding waste of water is an essential task for all stakeholders. Therefore, the aim of this paper is to design and implement a mobile phone-based remote control. This will be applied to control the operation of a submersible motor in a water tank. The water level in the tank is detected and the device remotely turns the motor pump on/off. The design process is accomplished by developing an android application that works on GSM technology to manage the filling of water tank. An AT89C51 microcontroller is used for the desired programming. At the transmitting end, sensor is used for level detection and GSM module is used to send the information to user. According to this information, user controls the on/off operation of the pump. A SIM card is required for its operation and it works on attention (AT) commands. After the design and implementation of the device, the test results showed that all features of the device worked properly, and the device functions exactly as expected. More significantly, the paper has shown that ultrasonic sensors can be used to determine the level of water in a water tank and a GSM module can be used to control a submersible pump. The design and implementation of this device can help to reduce waste of time and power. Ultimately, it avoids water wastage thereby ensuring availability, conservation, and sustainability of water supply.

A new diagnostic method for identifying working conditions of submersible reciprocating pumping systems

The submersible pumping unit is a new type of pumping system for lifting formation fluids from onshore oil wells, and the identification of its working condition has an important influence on oil production. In this paper we proposed a diagnostic method for identifying the working condition of the submersible pumping system. Based on analyzing the working principle of the pumping unit and the pump structure, different characteristics in loading and unloading processes of the submersible linear motor were obtained at different working conditions. The characteristic quantities were extracted from operation data of the submersible linear motor. A diagnostic model based on the support vector machine （SVM） method was proposed for identifying the working condition of the submersible pumping unit, where the inputs of the SVM classifier were the characteristic quantities. The performance and the misjudgment rate of this method were analyzed and validated by the data acquired from an experimental simulation platform. The model proposed had an excellent performance in failure diagnosis of the submersible pumping system. The SVM classifier had higher diagnostic accuracy than the learning vector quantization （LVQ） classifier.

基于混合模型的特种车辆转向泵马达性能评估

为了实现转向泵马达运行性能的实时评估,首先构建了转向泵马达物理模型,该模型考虑了转向泵马达运行机理,通过求解泵马达外特性方程、液压回路平衡方程、内部流量计算方程等,实现内部不可测参数的初步评估与计算,进而获得各类参数对转向泵马达性能的影响机制.同时采用LSTM深度学习方法构建了转向泵马达数据驱动模型,学习并预测不同工况下转向泵马达容积效率的变化规律,并将其输入至物理模型形成转向泵马达性能评估混合模型,提高不同工况条件下转向泵马达性能评估的准确性及适用性.实例分析表明,该混合模型可实现复杂工况下转向泵马达高低压侧压力、流量、转速及转矩等参数的计算与评估,模型误差低于10%.

基于多点电压电流信息融合的泵房设备故障诊断方法

为了实现自来水厂泵房及其二次加压泵房中配电设备与水泵故障的快速在线诊断与报警,保障泵房设备的安全运行,提出一种基于多点电压与电流信息融合技术的泵房设备故障在线诊断方法.基于泵房设备配电系统与设备构成,从理论上系统地分析了泵房配电设备与水泵常见故障所具有的电压与电流特征及其相互影响机理,使用配电线路中多个关键节点的实时电压、电流测量值进行融合处理,提取泵房配电主回路供电电压超限、配电线路中空气开关或接触器触头开路、水泵电机绕组开路、水泵电机绕组不平衡与匝间短路、水泵堵转、电机与水泵连接机构断开6类故障的故障特征,实现这些故障的在线诊断.阐述了故障诊断方法的执行条件、实现原理及具体实现步骤.使用MATLAB/Simulink搭建仿真模型进行实验验证,仿真结果表明,本文方法能有效地诊断泵房设备故障,克服了现有人工排查耗时耗力与离线分析不及时的不足,为自来水厂及其二次加压泵房配电设备与水泵的安全运行提供有效保障.