共查询到20条相似文献,搜索用时 46 毫秒
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离心压缩机作为速度型压缩机,其工作原理为通过叶轮的高速旋转,使气体的动能和压力得到提升,并经过扩压器使气体减速升压,从而获得满足使用需求的气体压力。由于其具有适用介质多、调节范围广、结构紧凑、检修周期短、易损件少等优点,因此被广泛用于我国的电力、冶金、石油化工以及天然气输送等领域中。随着近些年节能减排等环保理念的推广,提升压缩机自身的性能也成为大家关注的重点问题。 相似文献
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某发动机离心叶轮叶片的排气边多处出现裂纹,通过理化检验和定量分析对裂纹产生原因进行了分析,并估算了叶片的裂纹扩展寿命及其占总寿命的百分比。结果表明:该裂纹为高低周复合疲劳裂纹,叶片在异常振动等大应力作用下产生了疲劳开裂。 相似文献
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针对离心压缩机在复杂运行工况下的失谐与裂纹问题,研究裂纹与失谐对叶轮结构振动响应和振动局部化的影响规律。首先,采用三维有限元模型建立具有复杂几何形状的叶轮结构的定量分析模型,并通过在裂纹界面上定义接触的形式模拟裂纹的呼吸效应。其次,通过采用混合界面模态综合法对系统自由度进行缩减,以解决了采用三维有限元模型分析非线性系统动态响应时所存在的计算量大和收敛困难的问题。最终,采用Monte Carlo方法对含裂纹的失谐叶轮结构进行统计分析,研究随机失谐和裂纹故障对叶轮结构振动局部化的影响规律。结果表明裂纹和失谐都会对结构的振动响应产生显著的影响,并会导致振动能量的集中和振动局部化现象。 相似文献
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大尺寸航空发动机叶片的高效型面检测方法 总被引:1,自引:0,他引:1
介绍了一种基于三坐标测量机的高效型面检测方法。在传统叶片型面测量方法基础上,优化了传统扫描路径,提出了分区域、曲率自适应变速扫描方法,有效地解决了大尺寸叶片传统测量方法中频繁更换测针的问题。研究了一种过度扫描策略,通过高级编程对采集数据进行滤波,并采用数学拼接的方法得到完整叶型封闭曲线,用来分析叶片的几何参数。提出的大尺寸叶片检测方法在保证检测精度的同时,提高约40%的检测效率,并完善了传统检测方法叶型曲线不完整的问题。 相似文献
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某发动机压气机四级转子叶片榫头断裂分析 总被引:1,自引:0,他引:1
对某发动机经80h试车后四级压气机35~#转子叶片榫头折断故障做了分析。经金相与扫描电镜观察和模拟试验,使故障再现。分析认为,是加工配合过盈、局部接触应力过大出现微振磨损所致,并提出改进措施。 相似文献
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Theoretical and experimental investigations confirm that the theory of beams can be used, within its applicability range, for express-analysis of the frequency spectrum of turbomachine blades. A detailed analysis of the displacement and stress fields in the vibration of blades requires using three-dimensional models. 相似文献
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以嵌入式计算机系统为核心,结合数字模拟复合滤波技术和频率合成技术,构建新型智能化振动检查仪.系统硬件由信号发生电路、信号处理电路、计算机显示控制三部分组成,软件采用在DOS环境下内嵌汇编语言设计,全图形界面.系统采用模块化设计,简化了设备结构,具有技术先进、性能优越、操作简便等优点. 相似文献
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Turbine blades are the most critical components in any power plant. Failure in even one rogue blade out of hundreds of blades fixed on the rotor leads to colossal damage to the machine. Statistics have shown that low-pressure turbine blades in steam power plants are generally more susceptible to failure compared to high- or intermediate-pressure blades. The mechanism of failures is different in each case and is generally very complex. As a result, a large number of blade failures are not fully understood. Two primary forces acting on the blades are the steady centrifugal force due to rotation and the fluctuating steam bending force. In view of no direct access to monitor the health of the blades through vibration or other means, indirect method using non-contacting probes have been attempted and some are in use in special cases. Largely these methods are expensive and intrusive in nature. They involve placing of sensors in the narrow space inside the turbine casing, routing special signal cables with sealing arrangement and involves difficulties in analyzing shot duration signals from each rotating blades. Unless a diagnostic technique is made simple to implement and whose reliability is proven, power plants will not find it attractive to invest on upgrade for safe operation of the machine. This article is about an innovative method of detecting the presence of blade vibration in operating turbine through vibration signal analysis and prevention through process control. The method is based on vibration analysis of the turbine casing. The casing vibration includes signals associated with the blades of different stages called as blade passing frequency (BPF). When the rotating blades vibrate, the analysis of changes in the BPF is a novel way of diagnosing blade vibrations. Signals captured from operating plants have been analyzed and blade vibrations have been detected and verified with Campbell diagram. Laboratory experiments were carried out on a rotating fan to demonstrate robustness of the diagnostics tool for turbine blades. 相似文献