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1.
1.催化裂化装置的烟机机组是利用装置余热进行发电的系统,烟机转子由烟气驱动,带动发电机发电.烟机机组的简图及测点分布如下图所示.烟机 减速箱 发电机2.在烟机开机过程中,采用CSI2115振动测试仪和计算机监测系统从本特利二次仪表上拾取振动信号、表1是不同转速下,烟机转子的振动情况.表1 烟机转子开机过程振动幅值(振幅单位:μm 转速单位:r/min)从表1可以看出,烟机转子平稳运行时,振动幅值在25μm以下,处于良好运行状态;即使在转子过临界转速.η=1956r/min时,振动幅值也仅在150μm左右,说明烟机转子的动平衡性能优良,转子质量优良.在整个烟机开机过程中,对与烟机相连的齿轮箱和发电机也进行了振动测试,表2列出了各测点的振动幅值.从中可以看出,整个开机过程中齿轮箱和发电机组的振动处于良好运行状态,说明烟机系统的安装、  相似文献   

2.
针对某机组在安装调试阶段出现振动超标问题,应用多通道信号采集系统测量轴系振动特性,进行故障机理与相关因素分析,采用转子动平衡的措施校正补偿发动机转子热不平衡响应,有效地抑制了机组振动发散超标现象。  相似文献   

3.
转子绕组短路故障中短路因素对转子振动的影响   总被引:1,自引:0,他引:1  
分析了发电机转子绕组短路故障时作用于转子的不平衡电磁力表达式,得到了转子径向振动特征.指出转子绕组匝间短路故障将引起发电机转子基频振动,且振动程度与短路位置、短路匝数、励磁电流有关.短路位置对振动的影响为:短路点越靠近转子大齿,对转子振动影响越大;短路匝数对振动的影响为:对于相同的短路位置,短路匝数越多,转子振动越大;励磁电流对振动的影响为:对于一定的短路位置和短路匝数,励磁电流越大,转子振动越大.最后实测了SDF-9型故障模拟发电机转子径向振动信号,与理论分析结果基本吻合.  相似文献   

4.
发电机转子弯曲振动问题分析与处理   总被引:1,自引:1,他引:0  
某水电厂水轮发电机组由于运行故障,造成发电机转子塑性弯曲,机组检修后启动振动超标.通过对机组启动、加励磁、升负荷过程振动频谱的监测分析,判断引起振动异常的原因包括原始的弯曲和加励磁后的临时热弯曲.二者相互关联,共同引起机组在升速和带负荷过程中振动幅值的大幅爬升.根据诊断结果确定处理方案,先将发电机转子铣直后重新进行现场平衡,最终将转子的振动控制在合格范围内,彻底解决了振动异常问题.通过对弯曲发电机转子的振动特性分析和处理,分析了转子弯曲情况下的平衡响应变化及热弯曲情况变化等.  相似文献   

5.
金超武  杨雄  周瑾  熊顶超 《轴承》2022,(3):29-35+40
针对小型无轴承永磁薄片电动机的设计要求,基于理论计算与有限元仿真设计定、转子,并以转矩和悬浮力为目标设计电动机转矩绕组与悬浮绕组,以转子旋转坐标系为基础设计转子悬浮力直接控制策略。建立仿真模型对转子起浮及电动机升速过程进行仿真,仿真分析表明电动机起浮响应速度快,运行稳定。并搭建试验台进行验证,试验结果表明转子静浮时振动不超过±5μm,转速达到2 000 r/min时振动不超过±40μm,实现了电动机的稳定悬浮及旋转。  相似文献   

6.
张根珠  王延 《风机技术》2010,(3):60-63,72
对HA9-7型离心压缩机振动监测和频谱分析结果表明,电机转子力不平衡及联轴器轴心对中不良是引起机组电机振动超标及齿形联轴器齿面异常磨损的主要原因。采取电机转子动平衡试验技术检定及提高机组安装找正精度等措施,消除了故障,保证了机组可靠稳定的正常运行。  相似文献   

7.
某46MW机组在修后启动过程中,发电机转子振动严重超标,威胁到机组的安全稳定运行。通过现场振动数据采集分析,准确研判出引起发电机转子振动异常的原因为装配振动探头的Z型支架存在共振及发电机转子存在质量不平衡。通过对Z型支架进行加固和对发电机转子进行高速动平衡,消除了发电机振动异常故障,机组振动达到了优秀水平,为类似振动故障的处理提供参考。  相似文献   

8.
文章就某水电站发电电动机组在发电运行过程中,发生转子接地保护动作导致停机失败的故障案例,分析了转子绕组绝缘下降的主要因素和作用机理,并给出了相对应的处理措施与对策建议.本文可为发电机转子绕组绝缘缺陷的处理和检修维护方面提供借鉴和参考.  相似文献   

9.
通过对水泵机组动态特性测试分析,结合故障诊断分析,获知设备冷却水泵在正常工作条件下因不平衡载荷引起的转子振动情况。一方面结合模态测试与有限元仿真的方法,找出安装边界条件对水泵机组转子系统的振动影响,并进行部分结构的改进;另一方面采用有限单元法,计算转子在不平衡激励条件下的瞬态响应,分析转子振动的位移频谱和关键位置的支承力响应频谱,获得关键位置的振动位移、作用力的幅值以及频率信息。分析结果将用于设备冷却水泵整机的振动噪声分析,并研制出新型的复合阻尼转子系统。  相似文献   

10.
汽轮发电机组状态监测用振动传感器的选择与安装   总被引:1,自引:0,他引:1  
汽轮发电机组振动征兆蕴含着机组丰富的状态信息,它在很大程度上反映了机组的健康状况,这是因为任何其它方面(如压力、温度、转子不平衡、轴弯曲以及转轴摩擦、松动等)的变化或故障的发生,均会反映在转轴及轴承的振动征兆中.由于转轴及轴承上的振动信息易于获取,分析的手段也较完善,故目前国内外监测诊断系统大多以监测振动信号为主.机组振动信号的获取是由振动传感器来完成的,振动传感器的选择及安装正确与否,直接影响到监测诊断结果的正确性.  相似文献   

11.
This work is devoted to the evaluation of the influence of the curve shape of the ineradicable initial deflection of a two-span rotor with the residual imbalance on the transition vibration amplitudes at low critical speeds under the rundown. The model corresponds to a high-pressure rotor–combined mid-low-pressure rotor (HPR–MLPR) system of a turbine unit. It is assumed that rotors are connected by a rigid coupling and installed on anisotropic elastic damper supports. It is supposed that the resulting deflection (bend) of this system is formed as a result of the fact that a high-pressure rotor acquires the initial deflection during the operation or because of abnormal launch conditions, the curve shape of which for a load-free rotor is known. The influence of the mutual arrangement of the residual imbalances of rotors and the imbalances caused by the resulting deflection of shafting in a system on the amplitudes of its transition vibration under the rundown of a turbine unit has been studied for two shapes of the initial rotor deflection curve that have the highest and lowest values of the shape parameter. The values of the initial rotor bending deflection and the residual imbalance of both rotors have been set equal to the maximum acceptable values for the operation of a turbine unit. Amplitude calculations have been performed for rotors of a K-300-23.5 Leningrad Mechanical plant (LMZ) turbine.  相似文献   

12.
为了有效抑制由砂轮质量不平衡及外部干扰引起的永磁型电主轴转子系统砂轮端的多频率成分振动,在无轴承永磁电机径向磁悬浮力产生原理的基础上,提出了一种基于最小方差快捷分块(FBLMS)的自适应滤波的永磁型双绕组电主轴柔性转子系统砂轮端多频率成分振动的主动控制方案。首先研究了双绕组永磁型电主轴结构及工作原理和径向控制力的模型,借助有限元法建立了永磁型电主轴柔性转子系统的动力学模型,分析了控制电流的不同成分对永磁体涡流损耗及电机定子铁损的影响,设计了永磁型电主轴柔性转子系统砂轮端多频率成分振动的主动控制系统,结果表明,提出的永磁型电主轴柔性转子系统砂轮端多频率成分振动控制方案具有明显的控制效果。  相似文献   

13.
Vibration test and analysis results of running buckets are presented. A design modification is made on the 9th stage wheel dovetail of a high-intermediate pressure (HIP) turbine rotor for a 500 MW fossil power plant that necessitates the use of new long-shank buckets for the row. A bucket vibration test is necessary to verify whether the new 9-th stage buckets have adequate frequency margin from a nozzle passing frequency when running at speed. A finite element analysis (FEA) has been performed using commercial S/W to approximately estimate the difference between the modified and the normal bucket natural frequencies at various rotational speeds. After a row of the new buckets has been assembled on the HIP rotor for the vibration tests using dynamic balancing facilities, deceleration tests have been conducted. The test results are compared with the FEA and our empirical formulas, and show that the modified design meets the frequency-margin requirements.  相似文献   

14.
Rotor vibration characteristics are first analyzed,which are that the rotor vibration of fundamental frequency will increase due to rotor winding inter-turn short circuit fault,air-gap dynamic eccentricity fault,or imbalance fault,and the vibration of the second frequency will increase when the air-gap static eccentricity fault occurs.Next,the characteristics of the stator winding parallel branches circulating current are analyzed,which are that the second harmonics circulating current will increase when the rotor winding inter-turn short circuit fault occurs,and the fundamental circulating current will increase when the air-gap eccentricity fault occurs,neither being strongly affected by the imbalance fault.Considering the differences of the rotor vibration and circulating current characteristics caused by different rotor faults,a method of generator vibration fault diagnosis,based on rotor vibration and circulating current characteristics,is developed.Finally,the rotor vibration and circulating current of a type SDF-9 generator is measured in the laboratory to verify the theoretical analysis presented above.  相似文献   

15.
采用对转涡轮设计能提高航空涡轮发动机性能,其中无导叶方案是发展趋势之一。在无导叶对转涡轮中,低压转子叶片受到较大的高压转子出口气流激励。基于ANSYS/CFX软件,采用流固耦合数值分析方法对低压涡轮转子叶片进行了分析,得到了高压涡轮转子叶片尾流作用下的低压涡轮转子叶片振动的应力和变形变化规律。叶片温度对振动应力和位移的平均值、幅值和周期的影响较大,叶片材料密度对振动周期产生明显的影响,高低压转叶轴向间距的选择应兼顾涡轮效率等因素。  相似文献   

16.
转子对高压涡轮叶尖间隙变化规律的影响   总被引:2,自引:0,他引:2  
基于涡轮叶尖间隙主动控制的需要,初步分析了涡轮叶尖间隙的变化机理,建立了机匣、叶片和转子的简化模型。在此基础上,分别仿真计算转速变化和发动机起动过程瞬态温度下转子的径向变化,讨论了转子在飞行器机动飞行情况下的振动幅值对叶尖间隙的影响。结果表明,转子振动幅值和径向位移对叶尖间隙变化有重要作用。  相似文献   

17.
A novel exciter for applying a dynamic torsional force to a rotating structure is presented in this paper. It has been developed at IPP in order to perform vibration tests with shaft assemblies of large flywheel generators (synchronous machines). The electromagnetic exciter (shaker) needs no fixture to the rotating shaft because the torque is applied by means of the stator winding of an electrical machine. Therefore, the exciter can most easily be applied in cases where a three-phase electrical machine (a motor or generator) is part of the shaft assembly. The oscillating power for the shaker is generated in a separate current-controlled DC circuit with an inductor acting as a buffer storage of magnetic energy. An AC component with adjustable frequency is superimposed on the inductor current in order to generate pulsating torques acting on the rotating shaft with the desired waveform and frequency. Since this torsional exciter does not require an external power source, can easily be installed (without contact to the rotating structure) and provides dynamic torsional forces which are sufficient for multi-megawatt applications, it is best suited for on-site tests of large rotating machinery.  相似文献   

18.
Based on the mathematical model of a single-span turbine rotor featuring initial bending and residual imbalance, an estimate is made for the vibration amplitudes at the control points of the rotor span at speeds near the lowest critical values on the rundown. Two versions of rotor mounting on anisotropic foil bearings are considered, which simulate bench tests and interaction with the rest of the shafting during operation of the turbine, and two imbalance versions, one with the imbalance concentrated at one point and the other with the imbalance distributed along the rotor span. We present an example of calculations of vibration amplitudes at the lowest critical frequencies during rundown of the high-pressure rotor of a Model K-300-23.5 steam turbine. The rotor here is assumed to have the largest permissible initial deflection and residual imbalance values based on the limits imposed on these values in the operation of turbo units [1]. The results are analyzed.  相似文献   

19.
A Francis turbine which is one of the reaction water turbine types is mainly used in the multipurpose dam. The purpose of this research is to explain the vibration characteristics due to the various causes generated in Francis-turbines generator system. The hydrodynamic force was determined to use the fluid dynamics analysis considering the exciting force that is transmitted to the shaft from the runner part. Besides, in the generator parts electromagnetic forces can have a severe influence on the rotor dynamics in some situations. Because, the hydro turbine-generator system supported by various types of bearing, mechanical vibration analysis is also necessary. Based on a real small-scale Francis-turbine generators parameter, several analysis were performed the stability at the operating speed of the rotor such as natural frequency analysis and forced response analysis. Through this analysis, aside from the mechanical factor, electromagnetic and hydrodynamic factors have also been found to affect vibration.  相似文献   

20.
王俊 《装备制造技术》2014,(4):259-260,263
汽轮发电机是电力生产的重要设备。针对自行发电的大型工厂所使用的30MW同步式汽轮发电机,详细分析了发电机振动、发电机定子和转子故障、发电机发不出电压或电压不稳定等常见故障及其原因,并探讨了其维护检修的方法。  相似文献   

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