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| 1 | Friction Characteristics of Mechanical Seals with Laser-textured Seal Faces显示文摘Heat generated by friction between faces of mechanica l seals is a major factor that causes deterioration of the seals and shortens th eir service life. Excessive temperature rise can greatly alter the seal geometry and vaporize the sealing fluid, resulting in friction of boundary lubrication. These effects on face seals usually lead to excessive leakage and ultimately ren der the seal inoperable. In order to maintain the reliability of seals, high fri ction and unwanted wear must be avoided. Using the laser-texturing process to produce regular micro-surface structures is a fast and convenient technique compared to some more conventional etching or erosion technique currently used by the seal industry for various grooved face seals. Indeed, by using a pulse laser, better control is obtained on the geometr y, size and pore ratio of seal rings made of metallic or ceramic materials. In t his study, seal rings are made of silicon carbide and carbon. Mating faces of th e rings are polished and only silicon carbide rings are laser-textured. The las er texturing can be controlled to produce spherical pores at selected diameters, depths and pore ratio. The textured rings are then super-polished to remove th e bulges formed on the pores rims. After this process the average pore diameter, pore depth and pore ratio reach the predetermined parameter. Some untextured ri ngs are also treated to the same surface roughness and served as a reference for comparison of the textured rings. A special test rig is used to simulate a mech anical seal system and to measure the effect of the laser texturing on friction and seal performance. Tests are performed at various rotational speeds and vario us axial loads. Compared with the conventional mechanical seals, temperature rise, friction torq ue and friction coefficient of mechanical seals with laser-textured seal faces are much lower. These preliminary results show the potential of improving fricti on performance and increasing seal life with laser-textured seal faces. | YU Xin-qi 1,2, HE Song 1, CAI Ren-ling 1 (1. Research Institute of Pressure Vessel and Process Equi pment, East China University of Science and Technology, Shanghai 200237, China 2. College of Mechanical Science and Engineering, Hebei University of Science an d Technology, Shijiazhuang 050018, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 9 |
| 2 | Development of Temperature-Humidity Independent Control Air-Conditioning Unit for Residential Buildings显示文摘Cooling panels are increasingly used in domestic residential buildings.To provide medium temperature cold water for the cooling panel,and dehumidify the indoor air simultaneously,a new kind of temperature-humidity independent control air-conditioning unit was developed for single residential house by utilizing multi-variable technology.First,the supply air temperature was studied to determine the proper supply air flow rate for the humidity control.Then,the energy consumption of different temperature-humidity independent control systems was studied.The analysis indicates that unity evaporating temperature can be used to handle the moisture load and sensible heat load in two evaporators.So the unit scheme was put forward.Two evaporators were used to produce medium temperature water and dry air separately,and electric expansion valves were used to control the refrigerant distribution between the two evaporators.Then,experimental work was carried out to investigate the influence of compressor frequency,refrigerant distribution on the dehumidification capacity,energy efficiency and refrigeration capacity.In the end,the paper concludes that both compressor frequency and refrigerant distribution can control the dehumidification capacity,but the former influences the EER more than the latter,while the latter influences the refrigeration capacity more than the former.We can find a proper running point at certain sensible and latent cooling load by adjusting both compressor frequency and electric expansion valve.The energy consumption of this kind of unit was estimated and compared with present room air conditioners,which shows that it can save about 41% cooling energy consumption. | HAN Xing1,ZHANG Xu1,LIU Jin-tao2,GAO Si-yun2,KANG Yue2(1.Institute of HVAC & Gas,College of Mechanical Engineering,Tongji University,Shanghai 200092,China 2.Hisense R&D Center,Qingdao,266000,China) | 2009 | 湖南大学学报(自然科学版)2009，36，S1： | 3 |
| 3 | illness behavior and the sick role显示文摘 | Mechanic D Volkart E Stress | | 0，，1： | 1 |
| 4 | The Challenge of Canon-Part 3显示文摘 | D&M Nikkei'Mechanical | 2003 | D&M Nikkei Mechanical2003，，： | 1 |
| 5 | Charaterization of novel eircovims DNAs associated with wasting Syn- dromes in pigs显示文摘 | Mechan B M McNeilly F Ted D | 1998 | J Gen Viral1998，79，： | 1 |
| 6 | Adolescent health and illness behavior:review of the literature and new hypothesis for study of stress显示文摘 | Mechanic D | 1983 | J Hum stress1983，9，2： | 1 |
| 7 | Softening of nanocrystalline metals at very small grain sizes 显示文摘 | Mechanical Prog Mater small-sized size effect Schiotz J Di Tolla F D Jacobsen K W | 1998 | Nature1998，391，： | 1 |
| 8 | Adolescent health and illness behavior: review of the literature and new hypothesis for study of stress显示文摘 | Mechanic D | 1983 | J Humstress1983，9，： | 1 |
| 9 | The changing elderly population and future health care needs 显示文摘 | Mechanic D | 1999 | J Urban Health1999，76，1： | 1 |
| 10 | clinical isolates from the UK显示文摘 | Doumith M Ellington M J Livermore D M et aL Molecular mechanisms disrupting porin expression in ertapenem-resistant Klebsiella and Enterobacter spp | 2009 | JAntimicrob Chemother2009，63，4： | 1 |
| 11 | Cognitive slowing in Parkinson's disease resolves after practice 显示文摘 | Press DZ Mechanic DJ Tarsy D | 2002 | J Neurol Neurosurg Psychiatry2002，73，5： | 1 |
| 12 | Perceived need and help -seeking in adults with mood, anxiety, or substance use disorders显示文摘 | Mojtabai R Olfson M Mechanic D | 2002 | Arch Gen Psychiatry2002，59，1： | 1 |
| 13 | The influence of the bchaviour of welded joints contai- ning cracks in the weld metal显示文摘 | Rodrigues D M Menczes L F HAZ softening on the mechanical Loureiro A | 2004 | Engineering Fracture Mechan- ics2004，71，1314： | 1 |
| 14 | Sources of Power of Lower Participants in Complex Organizations显示文摘 | Mechanic D | 1962 | Administrative Science Quarterly1962，7，3： | 1 |
| 15 | Changing medical organization and the erosion of trus 显示文摘 | Mechanic D | 1996 | The Milbank Quarterly1996，74，： | 1 |
| 16 | The sources of power for lower participants in complex organizations 显示文摘 | Mechanic D | 1962 | Administrative Science Quarterly1962，，7： | 1 |
| 17 | Adolesceni health and Hness behavior:review of the literature and a new hypothesis for the study of stress显示文摘 | Mechanic D | 1983 | J Hum Stress1983，9，2： | 1 |
| 18 | Message and privacy protection in the context of vehicular Ad Hoc networks显示文摘 | WU H T YEIN A D authentication mechanism and HAIEH W S | 2015 | Mathematical Problems in Engineering2015，501，12： | 1 |
| 19 | Superependymal neuronal network in the primate brain显示文摘 | Scott D E Krobisch-dudley G Paull Wk The ventricular system in neuroendocrine mechanisms | 1998 | Submicrosc Cytol Pathol1998，30，1： | 1 |
| 20 | Predicting medication noncompliance after hospital discharge among pa- tients with schizophrenia显示文摘 | Olfson M Mechanic D Hansell S | 2000 | Psychiatr Serv2000，51，2： | 1 |
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