5DK-20e柴油发电机组成套设计

介绍了5DK-20e柴油发电机组成套设计过程。重点介绍了公共底座、滑油系统、燃油系统、混流式冷却水系统、启动马达系统、进排气系统、增压器叶轮清洗系统的设计及验证。台架试验及实船试验结果表明:该型发电机组技术指标达到了技术规格书要求。目前已投入批量生产。     

DL1100GF1型柴油发电机组的设计开发

介绍了柴油机“有差调节”调速器、有功功率调节、机组的无功功率调节、公共底座、发电机组隔振、柴油机起动等方面的设计研制成果。     

无公共底座柴油发电机组整体吊装技术

从仿真计算及实施工艺两方面对无公共底座柴油发电机组整体吊装技术进行设计和研究,并结合项目进行验证。结果表明：该吊装技术可以大大缩短安装周期,确保安装质量,具有很强的可操作性。     

某中速柴油机底座刚度对整机模态影响分析

某型中速柴油机在试车台测试时振动偏大,初步判定系柴油机底座刚度不足引起.对柴油机底座进行改进设计,在此基础上对不同方案的底座进行刚度计算和模态分析,然后对不同底座方案整机进行模态计算,得到底座刚度与整机振动模态间的关系.同时分析了采用不同垫板对整机模态的影响,为柴油机底座的选型设计提供参考.     

瞬变负荷蓄能发电机组设计

针对蓄能发电机组设计中诸如多段轴系回转精度、公共底座振动、机组起动等设计难点问题,通过参照常规设计并利用先进的仿真分析结合试验经验的手段,对蓄能机组进行了优化设计。实际应用表明:所设计的蓄能机组运行可靠,性能良好,可满足瞬变负荷用电需求。     

兆瓦级风力发电机组的稳定性分析

建立了风轮转子/塔架系统的运动方程,并通过对该方程进行解耦分析得到了机组的振动模态.在对兆瓦级风力发电机组的振动模态计算、分析的基础上,给出了系统固有频率的最低点;系统工作转速与系统固有频率的交汇点;塔架的半径、壁厚与系统固有频率的关系.以上研究对我国自主设计兆瓦级风力发电机组提供了一定的理论依据.     

异步风力发电系统的特征根灵敏度分析

文章以异步风力发电机组的动态模型为基础,在Matlab/Simulink中进行仿真和量测,得到相关稳态运行数据。通过参与因子的计算,分析了不同振荡模态与系统的动态过程之间的对应关系,通过特征根灵敏度的计算,得到了不同系统物理参数对相应振荡模态的影响,得到的分析结果与参与因子的分析结果是一致的,这些分析结果对进一步提高并网的异步风力发电机组的动态稳定性具有一定的参考价值。     

风力发电机组状态监测系统设计与应用

风力发电机组状态监测系统的设计可以有效降低机组的检修维护费用,保障机组的安全稳定运行。对风力发电机组状态监测和故障诊断技术进行了深入的研究,设计了风力发电机组状态监测系统,并详细介绍了系统的结构与功能。通过系统在大型风力发电场的成功应用,验证了其对风力发电机组状态监测与诊断的有效性。     

600MW汽轮发电机组转子系统建模与动力学特性分析

采用Solidworks软件对国产某600MW汽轮发电机组转子系统进行三维实体建模。运用Algor有限元软件对该机组各转子及轴系进行了动力特性分析。结果表明:该机组轴系的各阶模态频率值有按照各单转子各阶模态频率值由小到大顺序排列、各阶模态振型相对应的分布趋势;该机组的各转子及轴系的固有频率均满足远离工作频率的要求。为大型汽轮发电机组转子系统的三维实体建模及其动力特性有限元分析提供了一定的参考,研究结果为该机组的运行提供了理论依据。     

考虑电机激励的某型热气机发电机组振动响应计算

针对某型热气机发电机组建立了电机和热气机发电机组的有限元模型,用模态分析进行试验验证,进而得到了缩减模型.进行了同时考虑径向电磁力与机械载荷的电机多体动力学计算,及有无考虑电机激励的热气机发电机组振动响应计算;对比分析了热气机发电机机组振动加速度的计算值与实测值,试验验证了计算模型的正确性.研究成果可为发电机组电磁力的...     

600MW直接空冷汽轮机落地轴承箱刚性分析

采用有限元分析软件MSC．Nastran对空冷600MW汽轮机落地轴承箱计算模型进行有限元分析,计算轴承座的刚度,分析轴承座的刚性,确保机组运行的安全。     

Experimental identification of modal parameters of an industrial 2‐MW wind turbine

This contribution presents modal testing of a 2‐MW wind turbine on a 100‐m tubular tower with a 93‐m rotor developed by W2E Wind to Energy GmbH. This research is part of the DYNAWIND project of the University of Rostock and W2E. Beside classical modal analysis schemes, this contribution mainly focusses on the application of operational modal analysis techniques to a wind turbine. Specific problems are addressed, and hints for modal testing on wind turbines are given. Furthermore, an effective measurement setup is proposed for identification of the modal parameters of a wind turbine. The measurement campaign is divided in two parts. First, a measurement campaign using 8 sensor positions on a rotor blade was done while the rotor is lying on ground. Second, a detailed measurement campaign was done on the entire wind turbine with the rotor locked in Y position using 61 sensor positions on the tower, the mainframe, the gearbox, the generator, and the low‐voltage unit. While the rotor blade was tested by classical and operational modal analysis techniques, the entire wind turbine was tested by operational modal analysis techniques only. The mode shapes and eigenfrequencies of the wind turbine identified within the measurement campaigns are within the expected range of the design values of the wind turbine. But in contrast, the damping ratios differ strongly from those given in guidelines and literature. Furthermore, a strong influence of aerodynamic damping compared to structural damping is observed for the first tower mode even for a parked wind turbine.     

微型燃气轮机向心透平的设计和研究

在研究微型燃气轮机向心透平结构特点和工作原理的基础上,建立了向心透平设计计算的数学模型.利用计算机辅助设计技术完成向心透平的热力计算和通流部分的结构设计,应用参数化设计思想和三维建模技术实现其变参数时的快速实体建模,应用有限元分析方法进行叶轮的结构分析和优化,基于虚拟操作平台实现其装配顺序规划、碰撞检测和装配仿真.     

Measuring the Torsional Modal Frequencies of a 900 MW Turbogenerator

Transient torques exerted on the rotors of turbine generators can produce high stresses. This paper describes an investigation into the torsional properties of the shaft of a 1500 rpm steam turbine generator rated 900 MW and includes 1. prediction, by theoretical model of the shaft and rotor structure, of its undamped natural vibrations and natural modes; 2. determination, by measurements and subsequent modal analysis, of the complex natural vibrations (free and damped) and natural modes. For the measurements the rotor was torqued by shock torques applied by the turning gear, as well as by harmonic sinusoidal torques of variable frequency applied by a shaker. Vibrations were measured by accelerometers on the shaft and on some selected turbine blades. Two modal analysis computer programs were used to process the signals. The results obtained by theoretical predictions and by measured modal analysis verify that the theoretical characterization of the rotor structure is indeed valid for calculating the values of the natural frequencies. However, the damping factors measured by the two modal programs differ significantly.     

Application of the ensemble empirical mode decomposition and Hilbert transform to pedestal looseness study of direct-drive wind turbine

The fault signal problems of wind turbine are non-linear and non-stationary, thus it is difficult to obtain the obvious fault features. In this study, a time-frequency method based on EEMD (ensemble empirical mode decomposition) and Hilbert transform is presented to investigate the bearing pedestal looseness fault of direct-drive wind turbine. The real vibration signals are analyzed using IMFs (intrinsic mode functions) extracted by ensemble empirical mode decomposition and Hilbert spectrum in the proposed method. The experimental results indicate that the proposed method is effective to extract the fault features of bearing pedestal looseness of wind turbine. And the results also demonstrate that fault features of front bearing pedestal looseness are different from rear bearing pedestal looseness with the same looseness gap. The fluctuation of rotational frequency increases with the occurrence of front bearing pedestal looseness fault, especially the half rotational frequency and high-frequency components, and the shaft orbit is complex. Besides, we found that when the rear bearing pedestal is loosen, the fluctuation of rotational frequency also increases, and the half rotational frequency component can be found. But for the high-frequency components, it is not obvious, and the shaft orbit is an approximate ellipse. Although the fault features of front and rear bearing pedestal looseness are obvious, the powers generated by wind turbine generator only change slightly.     

Performance of a mixed gas–steam cycle power plant obtained upgrading an aero-derivative gas turbine

The performance that can be achieved in a power plant obtained upgrading a typical aero-derivative gas turbine is analysed. The methodology is based on the off-design analysis of the gas generator (compressor and high pressure turbine) in the upgraded plant configuration and is applied to the design of a power plant based on the recuperative water injected cycle. The gas generator operating region and its boundary have been evaluated for the upgraded plant configuration; an optimization procedure has been established in order to show the maximum efficiency and power output that can be achieved.     

燃气轮机驱动压缩机组负荷控制参数波动问题研究

西气东输工程燃气轮机驱动压缩机组控制系统负荷控制功能不完善,造成机组在压力自动控制模式下,燃机、压缩机的转速和排气温度等重要参数在运行过程中极不稳定,并呈现周期性振动特性,对燃机重要部件造成严重的低周疲劳损伤。本文对机组的控制方式进行了研究,分析了机组功率、转速、排气温度波动的机理,通过合理调整控制器参数解决了机组关键参数波动的问题,显著改善了机组的运行稳定性和可靠性,对于提高机组的使用寿命、降低热部件的疲劳损耗具有主要作用。所做工作对机组控制系统的设计和调整具有参考价值。     

一种基于燃气轮机实时模型的硬件在回路平台集成与验证

为了研究基于燃气轮机模型的先进控制算法和故障诊断技术,需要建立准确性和实时性更好的燃气轮机实时模型.采用基于模型的设计方法,在Simulink中建立燃气轮机分段线性化实时模型,通过代码生成技术和封装技术,将模型集成在南京航空航天大学航空发动机/燃气轮机全数字仿真平台和硬件在回路平台.在硬件在回路仿真试验中,燃气轮机实时...     

Genetic algorithm to optimize the design of main combustor and gas generator in liquid rocket engines

A genetic algorithm was used to develop optimal design methods for the regenerative cooled combustor and fuel-rich gas generator of a liquid rocket engine. For the combustor design, a chemical equilibrium analysis was applied, and the profile was calculated using Rao＇s method. One-dimensional heat transfer was assumed along the profile, and cooling channels were designed. For the gas-generator design, non-equilibrium properties were de- rived from a counterflow analysis, and a vaporization model for the fuel droplet was adopted to calculate resi- dence time. Finally, a genetic algorithm was adopted to optimize the designs. The combustor and gas generator were optimally designed for 30-tonf, 75-tonf, and 150-tonf engines. The optimized combustors demonstrated su- perior design characteristics when compared with previous non-optimized results. Wall temperatures at the nozzle throat were optimized to satisfy the requirement of 800 K, and specific impulses were maximized. In addition, the target turbine power and a burned-gas temperature of 1000 K were obtained from the optimized gas-generator design.     

燃气轮发电机变频启动特点和保护配置分析

结合西门子燃机和三菱燃机的典型配置,介绍了燃气轮发电机静态变频启动(SFC)装置的结构、工作原理和保护配置。基于燃气轮发电机SFC的步骤,分析了SFC的特点以及对发电机保护的影响。通过理解和分析低频过流保护、SFC装置直流接地保护的设计思想,提出了减少燃气轮发电机SFC过程中,防止发电机差动保护、频率保护和逆功率保护误动的措施,实际运行表明这些技术措施是可行的。