以某型汽轮给水泵组轴系为研究对象,提出轴承对外传递力的计算方法.对比分析不同轴承支撑方案下轴系的振动特性及轴承对外传递力的特性,进行机组轴系支撑方案论证研究.结果表明:在汽轮机单侧和双侧支撑方案下,机组轴系均可在额定工况转速范围内安全可靠地运行;在额定转速下,采用单侧支撑方案的机组,其各轴承外传力大于采用双侧支撑方案的机组,但在3 000 r/min以下的低速工况时,2种方案下的机组轴承外传力基本一致,且单侧支撑下中间轴承的外传力更小.该结论对于该类型汽轮给水泵组的结构设计具有一定参考价值.

利用有限元分析软件ANSYS Workbench对某空压机用增速齿轮箱进行模态分析,将计算得到的固有频率与箱体主要激振频率进行比较,使得箱体避开共振区,从而达到减振降噪的效果,为后续该类箱体的研究与改进提供参考依据.

针对某NGW型减速器行星轮支撑轴承在传递功率扩容后比压偏大的问题,通过调整该支撑轴承的结构尺寸,有效降低了该轴承比压.同时借助轴承分析软件以及有限元分析软件,对该轴承的油膜压力及厚度分布的合理性进行了复核计算.最后通过实物运行试验,验证了该行星轮支撑轴承功率扩容设计的合理性,为该类行星轮支撑结构的设计提供一定的参考.

针对某NGW型高速行星齿轮箱振动偏大的问题,通过对其振动频率进行测试分析,认为其啮合频率及倍频是振动偏大的主要因素,进而根据相位调谐理论对齿轮基本参数进行重新调整.对比调整前后齿轮箱的振动数据发现,调整后该型齿轮箱的振动加速度大幅降低,其振动偏大的问题得以有效解决.

For the serious scuffing failure during the process of the delivery test of the high speed crown gear coupling used in a NGW type epicyclical gearbox,the oil mass distribution and oil supply method of coupling in the gearbox are analyzed with three-dimensional CFD software,and the cause of scuffing failure is found out and the shortcomings of the design of original oil supply system is explicated.Finally,the reliable solutions for subsequent failure treatment and some reference for the design of similar couplings are provided.

This study focuses on the fault of the rotor axial displacement in a steam turbine. Through theoretical analysis, three main causes which lead to the fault are deduced. Based on the analysis, the elastic support plate using material PCrNi3Mo is designed and made, and the support construction using two pins is changed into reinforcing plate. The experimental results show that steam turbines using the new thrust bearing are well operated without obvious axial displacement. The construction of main thrusting bearing elastic support plate is modified and numerically calculated using finite element method, which shows that the modified support plate has a smaller deflection while under the same load.

Contraposing the poor vibration performance of certain planetary reducer in test-bed, this paper gets the vibration velocity spectrum of the reducer through spectrum test. It is found that the vibration frequency of the reducer equals the quadruple of that of the drive motor. The nature frequencies of test-bed main parts and their brackets are calculated according to the frequency components. The frequency of the reducer and its bracket is then found out to overlap the quadruple of the drive motor frequency. Based on the test and calculation results, the old gear box is replaced by a new gear box with different parameters, which finally solves the severe vibration problem of the planetary gear reducer.

Aiming at a certain NGW planetary reducer with high power and high speed,the method of convergence mass is adopted to simplify the parts of reducer as convergence mass,the connection of each part,parts and rack is simplified to elastic part,and the total system is simplified to a spring-mass system.In the modeling process,the mass center of gear and planet carrier component vibration displacement along lateral orientation and longitudinal orientation is considered,and the retortion-lateral vibration coupling model is built.Through solving dynamic differential equations,the each order inherence frequency and corresponding each resonance speed which representing the system dynamics characteristic is obtained.According to the design rotating speed,the rationality of reducer each structure parameter is verified.

In order to manufacture the certain NGW planetary reducer with high-power and high speed,it uses the method of convergence mass to predigest rotary parts and the coupings between parts,and finally gets a spring-mass system.In this process,it takes the vibrancy displacement of parts along planar orientation and rotational orientation into accout,finds the retortion-planar couping model,and finally gets the reducer' dynamic load coefficient via solving differential eguation.Based on the design rotating speed,it validates the rationality of structure and parameters.

The ability of noise of traditional parallel reducing gear driving is limited.In order to reduce the noise from gear driving,the type of gear it must be changed.So the planetary gear driving is brought forward.A high-power and high speed planetary gear box is designed and used through design and analysis.Thanks to that,the noise of the gear driving is dramatically reduced.This article introduced the use backward of the planetary gear box and it's design main point of uniformity load.The correction of design method and the feasibility of its structure design were corrected ulteriorly through the effect of noise reduce of planetary gear box.