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111.
This article proposes a precise and ecofriendly micromachining technology for aerospace application called electrochemical machining in pure water (PW-ECM). On the basis of the principles of water dissociation, a series of test setups and tests are devised and performed under different conditions. These tests explain the need for technological conditions realizing PW-ECM, and further explore the technological principles. The results from the tests demonstrate a successful removal of electrolytic slime by means of ultrasonic vibration of the workpiece. To ensure the stability and reliability of PW-ECM process, a new combined machining method of PW-ECM assisted with ultrasonic vibration (PW-ECM/USV) is devised. Trilateral and square cavities and holes as well as a group of English alphabets are worked out on a stainless steel plate. It is confirmed that PW-ECM will be probably an efficient new aviation precision machining method. 相似文献
112.
运用气垫支承技术进行重物运输是一种新型的物料搬运方法,它具有摩擦力小,机动灵活的优点,尤其适用于大型,精密装置的搬运,气垫支承技术的关键部件是柔性气垫单元,它在工作中的受力,变形是比较复杂的,本文采用联立求解雷诺方程和弹性元件变形方程的方法,对柔性气垫单元的受力,压力分布,变形及应力进行了计算,计算结果与实测数据基本一致,最后,讨论了结构参数对气垫性能的影响,可以作为气垫单元结构设计的参考。 相似文献
113.
《中国航空学报》2016,(2):411-423
This article examines the suitability of fabricating artificial, dragonfly-like, wing frames from materials that are commonly used in unmanned aircraft(balsa wood, black graphite carbon fiber and red prepreg fiberglass). Wing frames made with Type 321 stainless steel are also examined for comparison. The purpose of these wings is for future use in biomimetic micro aerial vehicles(BMAV). BMAV are a new class of unmanned micro-sized aerial vehicles that mimic flying biological organisms(like flying insects). Insects, such as dragonflies, possess corrugated and complex vein structures that are difficult to mimic. Simplified dragonfly-like wing frames were fabricated from these materials and then a nano-composite film was adhered to them, which mimics the membrane of an actual dragonfly. Finite element analysis simulations were also performed and compared to experimental results. The results showed good agreement(less than 10% difference for all cases).Analysis of these results shows that stainless steel is a poor choice for this wing configuration, primarily because of the aggressive oxidation observed. Steel, as well as balsa wood, also lacks flexibility. In comparison, black graphite carbon fiber and red prepreg fiberglass offer some structural advantages, making them more suitable for consideration in future BMAV applications. 相似文献
114.
冯川 《长沙航空职业技术学院学报》2011,11(4):59-64
提出了一种基于51单片机平台开发的某型主力运输机放大和整流组件试验器设计方案。通过硬件设计和软件设计,并经过调试验证,结果表明该试验器能完成对放大和整流组件的所有性能的测试,有方便、快捷等特点,提高了设备的检测效率。 相似文献
115.
116.
Mohammad Javad Kalaee Yuto Katoh 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2014
For a particular angle of incidence wave, it is possible for a slow Z-mode wave incident on an inhomogeneous plasma slab to be converted into an LO mode wave. But for another wave normal angle of the incident wave, it has been considered impossible, since an evanescence region exists between two mode branches. In this case we expect that the mode conversion takes place through the tunneling effect. We investigate the effect of the spatial scale of the density gradient on the mode conversion efficiency in an inhomogeneous plasma where the mode conversion can occur only by the tunneling effect. We use the computer simulation solving Maxwell’s equations and the motion of a cold electron fluid. By considering the steepness of the density gradient, the simulation results show the efficient mode conversion could be expected even in the case that the mismatch of the refractive indexes prevents the close coupling of plasma waves. Also, we show for these cases the beaming angle does not correspond to Jones’ formula. This effect leads to the angles larger and smaller than the angle estimated by the formula. This type of mode conversion process becomes important in a case where the different plasmas form a discontinuity at their contact boundary. 相似文献
117.
In order to improve the deposition rate and microstructure of pyrocarbon, nickel was introduced by electroplating on carbon fibers and used as a catalyst during the deposition of pyrocarbon at 1000 C using methane as a precursor gas. The distribution of nickel catalyst and the microstructure of pyrocarbon were characterized by scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray diffraction(XRD), and Raman micro-spectrometry. Results show that nano-sized nickel particles could be well distributed on carbon fibers and the pyrocarbon deposited catalytically had a smaller d002 value and a higher graphitization degree compared with that without catalyst. In addition, the deposition rate of pyrocarbon in each hour was measured.The deposition rate of pyrocarbon in the first hour was more than 10 times when carbon cloth substrates were doped with nickel catalysts as compared to the pure carbon cloths. The pyrocarbon gained by rapid deposition may include two parts, which are generation directly on the nickel catalyst and formation with the carbon nanofibers as crystal nucleus. 相似文献
118.
通过冻融和化学侵蚀试验,研究了NW-056A机场道面除冰液对道面水混混凝土耐久性的影响以及在道面除冰液环境下两种新型混凝土保护剂的防护效果。结果表明:①混凝土在道面除冰液中冻融后表面无明显剥落现象,相对动弹模损失率比在水中小很多,道面除冰液延缓了混凝土的冻融破坏:②混凝土在道面除冰液常温浸泡下表面无剥蚀现象,但强度比在水中降低很多,因此存在化学腐蚀.且主要表现为对混凝土内部结构的缓慢损伤;(④两种新型混凝土保护剂均对预防混凝土的冻融破坏以及除冰液环境下的腐蚀破坏起到一定作用,涂刷混凝土保护剂是提高混凝土道面耐久性的有效方法。 相似文献
119.
120.
FINITE DIFFERENCE MODEL FOR SIMULATION OF DENSIFYING CARBON-CARBON COMPOSITES BY CHEMICAL VAPOR INFILTRATIONP ROCESSES 总被引:1,自引:0,他引:1
NomenclaturesA0—coeficientoftheArheniusequationC(n)—hydrocarbonconcentrationinunit(n)(mol/cm3)C0—hydrocarbonconcentrationatex... 相似文献