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Fluid-solid Interaction Model for Hydraulic Reciprocating O-ring Seals

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Chinese Journal of Mechanical Engineering 2013年第1期26卷 85-94页

作者： liao chuanjun HUANG Weifeng WANG Yuming SUO Shuangfu LIU Ying State Key Laboratory of Tribology Tsinghua University

Elastohydrodynamic lubrication characteristics of hydraulic reciprocating seals have significant effects on sealing and tribology performances of hydraulic actuators, especially in high parameter hydraulic systems. Only elastic deformations of hydraulic reciprocating seals were discussed, and hydrodynamic effects were neglected in many studies. The physical process of the fluid-solid interaction effect did not be clearly presented in the existing fluid-solid interaction models for hydraulic reciprocating O-ring seals, and few of these models had been simultaneously validated through experiments. By exploring the physical process of the fluid-solid interaction effect of the hydraulic reciprocating O-ring seal, a numerical fluid-solid interaction model consisting of fluid lubrication, contact mechanics, asperity contact and elastic deformation analyses is constructed with an iterative procedure. With the SRV friction and wear tester, the experiments are performed to investigate the elastohydrodynamic lubrication characteristics of the O-ring seal. The regularity of the friction coefficient varying with the speed of reciprocating motion is obtained in the mixed lubrication condition. The experimental result is used to validate the fluid-solid interaction model. Based on the model, The elastohydrodynamic lubrication characteristics of the hydraulic reciprocating O-ring seal are presented respectively in the dry friction, mixed lubrication and full film lubrication conditions, including of the contact pressure, film thickness, friction coefficient, liquid film pressure and viscous shear stress in the sealing zone. The proposed numerical fluid-solid interaction model can be effectively used to analyze the operation characteristics of the hydraulic reciprocating O-ring seal, and can also be widely used to study other hydraulic reciprocating seals.

关键词： reciprocating O-ring seal elastohydrodynamic lubrication finite-element method fluid-solid interaction mixed lubrication,SRV friction and wear tester

Thermal Fluid-Solid Interaction Model and Experimental Validation for Hydrostatic Mechanical Face Seals

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 949-957页

作者： HUANG Weifeng liao chuanjun LIU Xiangfeng SUO Shuangfu LIU Ying WANG Yuming State Key Laboratory of Tribology Tsinghua University Beijing Institute of Astronautical Systems Engineering

Hydrostatic mechanical face seals for reactor coolant pumps are very important for the safety and reliability of pressurized-water reactor power *** accurate models on the operating mechanism of the seals are needed to help improve their *** thermal fluid–solid interaction（TFSI）mechanism of the hydrostatic seal is investigated in this *** models of the flow field and seal assembly are *** on the mechanism for the continuity condition of the physical quantities at the fluid–solid interface,an on-line numerical TFSI model for the hydrostatic mechanical seal is proposed using an iterative coupling *** mesh technology is adopted to adapt to the changing boundary *** were performed on a test rig using a full-size test seal to obtain the leakage rate as a function of the differential *** effectiveness and accuracy of the TFSI model were verified by comparing the simulation results and experimental *** the TFSI model,the behavior of the seal is presented,including mechanical and thermal deformation,and the temperature *** influences of the rotating speed and differential pressure of the sealing device on the temperature field,which occur widely in the actual use of the seal,are *** research proposes an on-line and assembly-based TFSI model for hydrostatic mechanical face seals,and the model is validated by full-sized experiments.

关键词： mechanical face seal hydrostatic thermal fluid–solid interaction experiment

Fluid-solid strong-interaction model of mechanical seals in reactor coolant pumps

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Science China(Technological Sciences) 2011年第9期54卷 2339-2348页

作者： liao chuanjun HUANG WeiFeng SUO ShuangFu LIU XiangFeng WANG YuMing State Key Laboratory of Tribology Tsinghua University Beijing 100049 China

The studies on the mechanisms and performances of the mechanical seals in reactor coolant pumps are very important for the safe operations of the pressurized water reactor power *** on the hydrostatic mechanical seal in reactor coolant pumps,an analytical fluid-solid strong-interaction model is proposed in this *** to the design features and operational principles of the seal,an analytical method to calculate the mechanical deformation of the seal assembly is developed based on the ring deformation theory.A strong-interaction algorithm combining the analysis of the mechanical deformation of the seal assembly and flow field between the seal faceplates is utilized,in which the three kinds of equations including the fluid domain,solid domain and coupling action are constituted in the same equations set and all the variables are solved *** the analytical fluid-solid strong-interaction model used for the seal is ***,the model is verified by the experimental *** on the model,the design parameters of the seal are *** different conditions of the general case and fixed seal leakage rate are discussed respectively,and the regularities that the seal behaviors are affected by the parameters of the holding screws on the clamp rings and seal faceplates are *** research results can provide a theoretical basis for performance analysis,design and assemblage of the *** to the numerical methods,the proposed model has the unique advantages of high efficiency,convenience and easy application of constraints.

关键词：强相互作用模型机械密封件冷却剂泵反应堆设计特点变形理论密封组件安全操作

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汉画像砖本体构建及其应用

图书馆论坛 2024年第6期44卷 88-98页

作者：索传军廖婧佩中国人民大学信息资源管理学院

汉画像砖具有丰富的中华文化基因。文章基于图像学三层次分析理论,以四川汉画像砖为例,分析并定义汉画像砖的核心概念、类、属性及约束条件等,使用Protégé完成对汉画像砖领域本体的构建和实例化展示,基于应用结果对汉画像砖本体进行... 详细信息

汉画像砖具有丰富的中华文化基因。文章基于图像学三层次分析理论,以四川汉画像砖为例,分析并定义汉画像砖的核心概念、类、属性及约束条件等,使用Protégé完成对汉画像砖领域本体的构建和实例化展示,基于应用结果对汉画像砖本体进行检验和评估。

关键词：汉画像砖本体图像学知识组织

Applications of Wigner high-order spectra in feature extraction of acoustic emission signals

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Engineering Sciences 2009年第3期7卷 59-65页

作者： Xiao Siwen liao chuanjun Li Xuejun Key Lab of Health Maintenance for Mechanical Equipment of Hunan Province Hunan Science and Technology University Xiangtan Hunan 411201 China Department of Precision Instruments Tsinghua University Beijing 100084 China

The characteristics of typical AE signals initiated by mechanical component damages are analyzed. Based on the extracting principle of acoustic emission(AE) signals from damaged components,the paper introduces Wigner high-order spectra to the field of feature extraction and fault diagnosis of AE signals. Some main performances of Wigner binary spectra,Wigner triple spectra and Wigner-Ville distribution (WVD) are discussed,including of time-frequency resolution,energy accumulation,reduction of crossing items and noise elimination. Wigner triple spectra is employed to the fault diagnosis of rolling bearings with AE techniques. The fault features reading from experimental data analysis are clear,accurate and intuitionistic. The validity and accuracy of Wigner high-order spectra methods proposed agree quite well with simulation results. Simulation and research results indicate that wigner high-order spectra is quite useful for condition monitoring and fault diagnosis in conjunction with AE technique,and has very important research and application values in feature extraction and faults diagnosis based on AE signals due to mechanical component damages.

关键词：声发射信号提取原理维格纳高阶谱应用声发射(AE)信号声发射技术故障诊断

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高速气流中的主动横向射流特征数值模拟

兵器装备工程学报 2023年第7期44卷 156-162页

作者：代威周萍廖传军王柏森北京宇航系统工程研究所北京100076 北京航空航天大学航空发动机研究院航空发动机气动热力国家级重点实验室北京100083

从横向射流应用角度出发,采用数值仿真方法,对极稀薄环境高速条件下横向射流特征进行研究,探究不同射流的压力、温度、速度、角度和主流速度、环境压力等变量对射流特征的影响规律,为射流在姿态控制作用力中的应用提供重要参考。仿真结... 详细信息

从横向射流应用角度出发,采用数值仿真方法,对极稀薄环境高速条件下横向射流特征进行研究,探究不同射流的压力、温度、速度、角度和主流速度、环境压力等变量对射流特征的影响规律,为射流在姿态控制作用力中的应用提供重要参考。仿真结果表明,射流和主流的动压比升高,射流的穿透深度明显增大,对主流流场径向上影响更远,射流掺混所产生的温度场变化比压力场变化更加明显,耦合面温度升高并前移;环境压力的降低使主流形成的旋涡尺寸减小,旋涡中心也向前移动;射流角度的改变主要对射流与主流耦合的位置及耦合位置附近旋涡分布产生影响,在有角度条件下,流场中旋涡更复杂,旋涡数量更多、旋涡相互作用更显著。射流压力和温度对于动压比的提高很明显,压力和温度的升高可明显提高射流反作用力,通过灵活调节压力和温度可实现不同反作用力。而不同主流环境与射流角度对于反作用力的影响基本可忽略。

关键词：稀薄环境横向射流动压比涡系射流特征

超临界态二氧化碳流体热力学性质的分子动力学模拟

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低温工程 2022年第4期 70-75页

作者：刘丽丽代威杨智廖传军西安航天神舟建筑设计院有限公司北京分公司北京100040 北京宇航系统工程研究所北京100076 广东工业大学材料与能源学院广州510006

采用恒温恒压(NPT)系综分子动力学模拟方法,模拟预测了超临界态区间内(温度600—900 K,压力30—100 MPa)CO_(2)流体的热力学特性(密度和比定压热容),同时对比研究了4种典型的半经验型力场的预测性能。结果表明:4种力场在超临界态热力区... 详细信息

采用恒温恒压(NPT)系综分子动力学模拟方法,模拟预测了超临界态区间内(温度600—900 K,压力30—100 MPa)CO_(2)流体的热力学特性(密度和比定压热容),同时对比研究了4种典型的半经验型力场的预测性能。结果表明:4种力场在超临界态热力区间内对CO_(2)流体的密度和比定压热容特性均具有较好的预测精度,其中密度的预测偏差在3%以内,而比定压热容的预测偏差在1%以内。相比单点粗粒化SAFT-γ力场,具有更多参数自由度的全原子力场对超临界区间内流体热物性的预测并不具有显著优势,这表明其力场参数对于超临界态物性的预测而言并非最优解。EPM2和Zhang力场对CO_(2)流体密度和比定压热容的预测偏差均随温度的升高而减小,表明此两种力场可用于更高温度工况下热力学特性的模拟预测。

关键词：分子动力学模拟超临界态密度比定压热容

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适于声发射信号故障特征提取的小波函数

机械工程学报 2008年第3期44卷 177-181页

作者：李学军廖传军褚福磊湖南科技大学机械设备健康维护湖南省重点实验室湘潭411201 清华大学精密仪器与机械学系北京100084

小波分析具有很强的弱信号检测能力,适于提取声发射信号的故障特征,但是在目前声发射信号的小波分析中,所普遍采用的小波函数诊断效果欠佳,亟需改进和优化。在分析典型机械故障声发射信号特征的基础上,根据损伤型声发射信号故障特征的... 详细信息

小波分析具有很强的弱信号检测能力,适于提取声发射信号的故障特征,但是在目前声发射信号的小波分析中,所普遍采用的小波函数诊断效果欠佳,亟需改进和优化。在分析典型机械故障声发射信号特征的基础上,根据损伤型声发射信号故障特征的提取原理,通过连续小波基函数的构造方法,设计了一种适于声发射信号故障特征提取的小波基函数。将该函数与普遍使用的Daubechies小波同时用于声发射检测的滚动轴承损伤类型及部件的识别,结果表明前者的诊断效果更加清晰、准确、可靠。理论分析和试验研究均证明了所构造小波函数的科学性和有效性。

关键词：小波函数小波变换声发射故障诊断特征提取滚动轴承

纳米颗粒对超临界二氧化碳流体传热特性的影响

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兵器装备工程学报 2023年第5期44卷 142-149页

作者：代威刘丽丽杨智廖传军陆浩然北京宇航系统工程研究所北京100076 西安航天神舟建筑设计院有限公司北京分公司北京100040 广东工业大学材料与能源学院广州510006

针对超临界二氧化碳纳米流体,采用数值模拟方法研究了纳米颗粒体积分数、壁面热流密度对其在水平管内传热特性的影响。结果表明:当给定入口质量流量,纳米颗粒的掺杂会增大流体密度,入口流速因此而减小,不利于传热;但纳米颗粒的掺杂使得... 详细信息

针对超临界二氧化碳纳米流体,采用数值模拟方法研究了纳米颗粒体积分数、壁面热流密度对其在水平管内传热特性的影响。结果表明:当给定入口质量流量,纳米颗粒的掺杂会增大流体密度,入口流速因此而减小,不利于传热;但纳米颗粒的掺杂使得纳米流体热导率显著增大,这有助于提升壁面热流向体相空间的传输速率。因此纳米粒子体积分数越大,其体相流体温度在沿程方向上升温速率也越快。当壁面热流密度q=30 kW·m^(-2)时,纳米流体在沿程方向上均具有传热强化效果;在更高热流密度时,纳米流体仅在流动充分发展初期具有强化传热效果,在换热管末端其传热效果随体积分数增加显著恶化。

关键词：纳米颗粒超临界二氧化碳数值模拟传热特性温度分布