“气体润滑与干气密封”专辑序言

冯 凯

(湖南大学 机械与运载工程学院, 湖南 长沙, 410082)

气体轴承与干气密封由于采用气体来实现完全非接触悬浮和密封，所以具有损耗低、效率高和寿命长等特点，能够满足装备超高速、超精密、高效率和长寿命等极端性能需求，已成为精密制造、能源动力和航空航天等领域高端装备转型升级的引领性技术.随着气浮装备服役环境复杂程度的不断提高，对气浮部件的承载能力、稳定性和适应性等方面提出了更高的要求.气体轴承与干气密封技术涉及润滑与密封机理、结构优化、部件材料、高性能制造、性能检测以及系统集成等多个领域.近年来，在国家重点研发计划等项目的牵引和气浮装备产业化浪潮的推动下，国内气浮技术在基础研究和产业化应用等方面都取得了不少的进展.各位专家和学者从极端工况下气浮部件的润滑机理与性能分析、面向性能需求的气浮部件结构优化设计方法、气浮部件与系统的耦合分析与集成设计以及气浮部件与系统的性能检测与评价等多个层次进行了大量的工作，取得了大量的重要成果.

《摩擦学学报》推出了“气体润滑与干气密封”专辑，旨在反映近期我国高校、科研院所以及企业在气浮部件领域的最新研究进展.专辑内包含13篇最新研究论文包括：接触式机械密封混合润滑状态摩擦演化规律研究；基于流体动压原理的密封槽型优化方法；多斜孔节流气浮支承的微振动特性研究；实现振动解耦的摩擦学行为模拟试验台设计方法；分片式可变间隙径向滑动轴承混合润滑研究；基于端面振动测量的机械密封摩擦学行为试验研究；小孔节流空气静压止推轴承平面跨缝试验研究；柔性箔片气膜密封实际表面状态下的声发射信号特征；新型自冲击密封的泄漏特性与封严机理初探；表面形貌对浮动式箔片气膜密封性能的影响分析；用于微重力试验的气磁混合悬吊单元研制；悬臂止推箔片轴承三维流-固-热耦合数值分析；随机工况主动式动压型干气密封调控力智能预测及其算法性能对比研究.本专辑收集了国内高水平研究团队在气体润滑与干气密封方面的研究成果，包括润滑机理、建模分析、结构设计、系统集成、性能测试以及工程应用等，希望通过这期专辑论文的整理和发表，能够吸引更多的专家学者致力于气浮技术的研究，提升我国气体润滑与干气密封领域的研究和应用水平，促进我国气体润滑与干气密封产业的蓬勃发展.

在本专辑出版之际，谨向对本专辑给予支持的西安交通大学、天津大学、北京化工大学、中国计量大学、昆明理工大学和江苏海洋大学等单位表示诚挚的谢意！也衷心感谢相关审稿专家及《摩擦学学报》编辑部为本专辑的策划出版所做的大量工作.

Preface to Special Issue “Gas Lubrication and Dry Gas Sealing”

FENG Kai
(College of Mechanical and Vehicle Engineering,Hunan University, Hunan Changsha 410082,China)

Gas bearings and dry gas seals have the characteristics of low loss, high efficiency, and long service life due to the use of gas to achieve completely non-contact suspension and sealing.They can meet the extreme performance requirements of equipment, such as ultra high speed, ultra precision, high efficiency and long service life.They have become leading technologies for the transformation and upgrading of high-end equipment in precision manufacturing,energy power and aerospace.With the increasing complexity of the service environment of air flotation equipment,higher requirements have been put forward for the load-bearing capacity, stability and adaptability of air flotation components.Gas bearings and dry gas sealing technology involve multiple fields such as lubrication and sealing mechanisms, structural optimization, component materials, high-performance manufacturing, performance testing and system integration.In recent years, driven by national key research and development plans and the wave of industrialization of air flotation equipment, domestic air flotation technology has made significant progress in basic research and industrial applications.Experts and scholars have conducted extensive work on the lubrication mechanism and performance analysis of air suspension components under extreme operating conditions, performance oriented structural optimization design methods for air suspension components, coupling analysis and integration design of air suspension components and systems, as well as performance testing and evaluation of air suspension components and systems, and have achieved significant results.

Tribology releases an issue titled "Gas Lubrication and Dry Gas Sealing", aiming to reflect the latest research progress in the field of air bearing components in universities, research institutes and enterprises of China.The album contains 13 latest research papers, including frictional evolution of contact mechanical seals with hybrid lubrication;optimization method of seal groove shape based on hydrodynamic pressure principle; micro-vibration characteristics of aerostatic bearing with multiple inclined orifice restrictor; design method of tribological behavior simulation experiment device for vibration decoupling; mixed lubrication of multi-pad journal bearing with variable clearance; experimental research on tribological behavior of mechanical seal based on face vibration measurement; experimental study on plane cross joint of air static thrust bearing with small orifice throttling; variation of surface roughness on acoustic emission signal characteristics of compliant foil gas sea; initially search on leakage characteristics and sealing mechanism of a new type self-impact seal; impact analysis of surface morphology on floating foil film sealing performance;development of an air-magnetic hybrid suspension unit for microgravity testing; 3D thermal-elasto-hydrodynamic numerical analysis of multi-leaf gas foil thrust bearing; intelligent prediction of control force of active hydrodynamic pressure dry gas seal under random conditions and comparative study of its algorithm performance.This issue collects the research achievements of high-level domestic research teams in gas lubrication and dry gas seals, including lubrication mechanisms, modeling analysis, structural design, system integration, performance testing and engineering applications.It is hoped that through the organization and publication of this issue, more experts and scholars can be attracted to the research of air flotation technology.The research and application level in the field of gas lubrication and dry gas seals in China can be improved, promoting the vigorous development of China's gas lubrication and dry gas sealing industry.

On the occasion of the publication of this issue, I would like to express my sincere thanks to Xi 'an Jiaotong University, Tianjin University, Beijing University of Chemical Technology, China Jiliang University, Kunming University of Science and Technology and Jiangsu Ocean University for their support.I would also like to express my sincere thanks to the relevant reviewers and the editorial department of the Tribology for their great efforts in the planning and publication of this issue.