转子加套修复的理论与实践

介绍了气压机转子磨损后的两次修复和处理过程,同时对故障原因和修复方案进行了必要的分析和计算,并说明了最终修复成功的意义.     

Influence of an additional elastic stress on dry wear behaviour in reciprocating tests

This paper is concerned with an experimental investigation to assess the influence of the additional elastic bulk stress state, as imposed by an external load, on dry reciprocating wear. Results obtained from dry reciprocating wear tests on an Al7175 alloy, in contact with a 34CrNiMo6 steel pin, are presented. It is shown that the additional elastic bulk stress has a substantial influence on the wear behaviour of the materials used in this study. It is, therefore, pertinent to take it into consideration in wear assessment. A physical model, based on micro and macro surface roughness, capable of interpreting the experimental obtained results has been developed. The model proposed is a modification of the Archard's model for the prediction of wear volume, in order to take into account elastic bulk stresses imposed by external loading.     

基于虚拟正交试验的压气机叶轮轴-毂径向微动特性研究(英文)

采用Pro/E建立压气机叶轮轴-毂三维模型,利用ANSYS软件采用子结构结合网格随移技术的分析方法,建立其有限元模型;采用虚拟正交试验方法对压气机叶轮轴-毂进行仿真,得出过盈量、摩擦系数、转速对最大单位摩擦功和平均摩擦功影响显著性次序及影响规律,从而得到最优组合。     

轴流压缩机的防喘振控制

通过对轴流压缩机喘振现象和防喘振控制方法的分析,设计了一种基于变增益系数和变积分系数结合的PID调节喘振的方案。该方法有效地克服了变增益系数法系统易扰动和变积分系数法的易滞后缺点,从而提高了轴流压缩机的安全和经济性能。     

变频调速技术在瓦斯装置中的应用

在介绍瓦斯装置活塞式压缩机工作流程基础上,详细分析了目前控制方案中存在的缺点,并提出了变频调速节能改造控制方案,阐述了压缩机变频调速改造过程中应注意的问题。现场运行情况表明,变频调速节能改造是成功的,节能效果明显,降低了故障率,减少了操作员的劳动强度。     

管道压缩机的负荷分配控制

以国内首个国产化气压站为研究对象,通过设计,组态的过程分析到系统中的负荷分配方案为各机组的喘振控制器的偏差Dev相等。这一控制算法可以将不同厂家、不同大小和新旧不一的机组稳定控制在负荷平衡的状态下,使得网络效率最大化（节能）,避免了不必要的回流。     

降低往复式压缩机振动与噪声的设计

在总体结构不变的情况下，分析了往复式压缩机活塞直径大小和曲轴偏心量的配合造成的不平衡力变化对压缩机振动与噪声的影响，并通过试验结果进行了验证。结果表明：选择较小的活塞直径配较大的曲轴偏心量是比较优秀的设计方案。     

移动式空压机车架的有限元析分析及结构改进

车架作为移动式空压机的主要承载部件,其结构强度对空压机使用性能有很大的影响。在某移动式空压机车架结构设计时,最关心的问题之一是车架被吊起时的结构强度是否满足要求。按企业标准,应用有限元分析手段,对移动式空压机车架建立有限元模型,并在起吊工况下对其进行结构强度分析。结合应力应变电测试验,将有限元分析数据与电测试验数据进行对比,找出车架结构的薄弱环节,并加以改进。力图找到一个能有效节约移动式空压机车架开发设计成本的方法和手段。     

迷宫往复式压缩机曲轴扭振分析研究

迷宫密封往复压缩机是一种新型压缩机,以其压缩和输送洁净气体,广泛的应用于国民经济的各部门。曲轴是往复式压缩机的主要运动部件,其结构参数在很大程度上决定并影响了压缩机的可靠性及工作寿命。以6M50型往复压缩机为分析对象,利用三维建模软件Pro/E对其进行轴系建模,随后将其导入ANSYS中,建立相应的约束,并施加载荷,然后对其进行静力分析、模态分析。结果表明,该分析技术可以全面系统地分析轴系各项动力特性,可以直观准确地获得轴系不同部位、不同时刻的应力分布,为大型往复压缩机轴系设计提供可靠的理论依据。     

Nonlinear model predictive control for efficient and robust airpath management in fuel cell vehicles

The fuel cell airpath multivariable control problem of optimally coordinating the electric compressor motor and the back-pressure valve to achieve efficient and safe conditions, for both steady state and transient operation, has not been completely addressed in the literature. This paper proposes a nonlinear model predictive control strategy, implemented via the Garrett Motion proprietary NMPC toolbox, to regulate the oxygen stoichiometry and the cathode pressure of an automotive fuel cell airpath system, while avoiding compressor surge and air starvation. The controller set-points are optimized, using the nonlinear model, to achieve the maximum system power as a function of the operating stack condition. The effectiveness and robustness of the proposed control strategy have been validated by means of a simulated World harmonized Light-duty vehicles Test Cycle (WLTC), under both state feedback and model parameters uncertainties.