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Patent
Commercial Aircraft Corporation Of China Ltd, Shanghai Aircraft Design, Research Institute and Shanghai Aircraft Manufacturing Co. | Date: 2017-02-15

The present disclosure provides an aircraft wing assembly, comprising: an aircraft wing having a wing box; a winglet disposed at a wing tip of the aircraft wing, the winglet being connected to the aircraft wing through the wing box; a connection comprises a joint rib for assembling with the wing box and a central joint for assembling with the winglet, wherein the joint rib has a first shearing pins hole and a second shearing pins hole, for being pressed into corresponding first and second shearing pins to form an interference fit, respectively; the central joint has a first bushing hole and a second bushing hole, for being pressed into corresponding first and second bushings to form an interference fit; a positional relationship between the first shearing pins hole and the second shearing pins hole is identical to a positional relationship between the first bushing hole and the second bushing hole, such that when the winglet assembled with the central joint moves towards the wing box assembled with the joint rib, and when the first and second shearing pins are inserted into the first bushing hole and the second bushing hole on the center joint, respectively, small clearance fit is achieved between the first and second shearing pins and between the first and second bushings, respectively.


News Article | May 5, 2017
Site: news.yahoo.com

China's home-grown C919 passenger jet took off on its maiden test flight on Friday, a key milestone in the country's drive to compete with US and European aircraft makers (AFP Photo/Andy Wong) Shanghai (AFP) - The first large made-in-China passenger plane successfully completed its maiden test flight Friday, marking a key milestone on the country's ambitious journey to compete with the world's leading aircraft makers. The narrow-body C919 jet -- white with green and blue stripes -- disappeared into the clouds after taking off from Pudong international airport in the commercial hub Shanghai as a crowd of thousands cheered, including top officials. It successfully landed some 80 minutes later and the five-member crew was handed flowers, with captain Cai Jun describing the flight as "very satisfactory." Built by state-owned aerospace manufacturer Commercial Aircraft Corporation of China (COMAC), the plane represents nearly a decade of effort in a government-mandated drive to reduce dependence on European consortium Airbus and US aerospace giant Boeing. "China's big commercial jet project made a huge breakthrough. It is a major milestone of China’s aviation market," China's State Council said in a statement. State media said the plane flew at an altitude of around 3,000 metres (9,800 feet), some 7,000 metres lower than a regular trip, and at a speed of more than 300 kilometres (186 miles) per hour. While delayed since last year, the flight is the latest sign of China's growing ambition and technical skill, coming one week after the country launched its first domestically made aircraft carrier and docked a cargo spacecraft with an orbiting space lab. China has dreamt of building its own civil aircraft since the 1970s, when it began work on the narrow-body Y-10, which was eventually deemed unviable and never entered service. President Xi Jinping himself has endorsed the new project. His call to arms is emblazoned on the wall of the jet's production facility: "Accelerate the construction of the world's top aviation company and continue to make new contributions to develop a strong aviation industry." China is a massive battleground for Boeing and Airbus, with the country's travel market expected to surpass the United States by 2024, according to the International Air Transport Association. Airbus and Boeing estimate that Chinese airlines will need between 6,000-6,800 aircraft at a total price of around $1 trillion. Both companies congratulated COMAC on the flight. The twin-engine C919, whose name sounds like the Chinese word for "everlasting", can seat 168 passengers in an arrangement similar to other narrow-body jets: three white-velvet upholstered seats line each side of its central aisle. It has a range of 5,555 kilometres (3,444 miles) and has received 570 orders, almost all from domestic airlines. COMAC made two planes for the test flight and it expects to produce four more by 2019, said Bao Pengli, deputy head of Shanghai Aircraft Manufacturing Co., COMAC's production arm. The Shanghai-based firm aims to become one of the world's leading civil aircraft manufacturer in the next three years, seeking to have the C919 and its ARJ21, a smaller 90-seat regional jet, both certified to fly internationally. But it will be sometime before the C919 is ready to compete with the top-selling products of the world's aviation giants, said Bao. "The biggest challenge is that the whole manufacturing experience still needs improvement because this is the first time China is making a primary route plane," Bao said. The C919 will need to pass more tests to obtain Chinese airworthiness certification and COMAC hopes to get the green light from US and European regulators. The ARJ21 plane, which entered service in 2016, several years late, is currently restricted to flying domestic routes as it still lacks the US Federal Aviation Administration (FAA) certification. Another challenge for the C919 is earning consumers' trust, said Shukor Yusof, an analyst with Malaysia-based aviation consultancy Endau Analytics. "It will take some time for customers around the world to be comfortable buying Chinese airplanes," he said, adding, "it's not going to happen in the next 10 years." "It's going to be incredibly tough not because it's not a good product. But because you need to get comfort and credibility to the product among potential clients, potential customers."


Liu Z.Q.,Shanghai JiaoTong University | Liu Z.Q.,Jiangsu University of Science and Technology | Xu J.,Shanghai JiaoTong University | Han S.,Shanghai Aircraft Manufacturing Company Ltd | Chen M.,Shanghai JiaoTong University
International Journal of Precision Engineering and Manufacturing | Year: 2013

This paper presents a new flexible method referring to coupling response surface methodology (CRSM) to acquire optimum cutting parameters in machining of difficult-to-cut titanium alloy under minimum quantity lubrication (MQL) condition. Cutting speed, feed rate and depth of cut are designed as three factors by using the Taguchi method, which are also subject to several constraints including processing efficiency, cutting force and surface quality. In addition, turning experiments of titanium alloy were performed in order to set up the model based on Taguchi experimental design and multiple regression method. ANOVA was carried out to prove the adequacy of the developed mathematical model and the influences of cutting parameters on constraints were also observed. The results indicated that the feed rate was the dominant factor affecting surface roughness and cutting forces, which were minimized when the feed rate and depth of cut were set to the lowest level, while cutting speed was set to the highest level. Moreover, the predicted values obtained by CRSM were in good agreement with the experimental values, which indicated that CRSM was an effective method to determine optimum cutting conditions for machining process under MQL condition. © 2013 Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg.


Liu Z.,Shanghai JiaoTong University | Liu Z.,Jiangsu University of Science and Technology | An Q.,Shanghai JiaoTong University | Xu J.,Shanghai JiaoTong University | And 2 more authors.
Wear | Year: 2013

Dry machining and minimum quantity lubrication (MQL) machining which are two types of green manufacturing processes have vast potentials for machining of titanium alloys. Tool coating is one key factor to realize high speed machining and green manufacturing. However, the tool coatings used presently in machining of titanium alloys cannot meet with the requirement of high speed machining and green manufacturing processes. The nanocomposite coatings can be alternativly applied in high-speed machining of α+β phase titanium alloy Ti-6Al-4V. In this research, the wear rate, wear pattern and wear mechanism of two kinds of nanocomposite coatings, (nc-AlTiN)/(a-Si3N4) and (nc-AlCrN)/(a-Si3N4), in dry and MQL conditions were investigated. Results showed that (1) MQL condition, which has cooling and lubricating effects, was found to have more significant influence in improving the tool life as compared to dry condition. Furthermore, the (nc-AlTiN)/(a-Si3N4) coated tool was confirmed to be more suitable for machining of titanium alloy than (nc-AlCrN)/(a-Si3N4) coated tool under MQL condition, which emphasizes the significance of matching between cutting fluids and coating materials. (2) The slower wear rate of (nc-AlTiN)/(a-Si3N4) coated tool in MQL condition was obtained than that of the (nc-AlCrN)/(a-Si3N4) coated tool. As a result, MQL condition can greatly prolong the tool life of (nc-AlTiN)/(a-Si3N4) coated tool while has minor influence on improving the tool life of (nc-AlCrN)/(a-Si3N4) coated tool. (3) Adhesive wear was observed to be the main wear type. The MQL technique not only has cooling and lubricating effects on nanocomposite coated tool, but also helps to form powerful protective layer. In addition, in MQL condition, the (nc-AlTiN)/(a-Si3N4) coated tool only suffered adhesive wear while the (nc-AlCrN)/(a-Si3N4) coated tool suffered adhesive, diffusion and oxidation wear. In contrast, when turning tests were performed under dry cutting condition, adhesive wear and oxidation wear might be the main wear types for the two coated carbide tools. © 2013 Elsevier B.V.


Patent
Commercial Aircraft Corporation Of China Ltd and Shanghai Aircraft Manufacturing Co. | Date: 2013-12-04

An apparatus for testing the gas permeability on the lateral direction of a resin matrix composite material layer, comprising: a mold (1), a loading apparatus (2), a temperature control apparatus (3), a vacuuming apparatus (6), and a flow detecting element (4). The mold (1) is constituted by at least a cavity and a covering plate sealing the cavity. Sealing elements are accommodated within the cavity. A test specimen is laid flat between the sealing elements and is sealed airtight by the sealing elements except for two ends of the test specimen on the lateral direction of the resin matrix composite material layer. An air inlet and an air outlet respectively are arranged on the mold (1) and correspond to the two ends of the test specimen not being sealed airtight, wherein the inlet is connected to the flow detecting element (4) and the outlet is connected to the vacuuming apparatus (6). By providing a force for air to move in a vacuumed cavity along the lateral direction of the pre-impregnated resin matrix composite material layer, the apparatus allows for testing of the air permeability of the pre-impregnated material along the lateral direction of the resin matrix composite material layer. Testing of air permeability of pre-impregnated material in solidification technique is allowed via adjustments of pressure and temperature.


Patent
Commercial Aircraft Corporation Of China Ltd and Shanghai Aircraft Manufacturing Co. | Date: 2013-12-04

The present invention discloses a testing apparatus for testing air permeability on thickness direction of a plastic matrix, comprising: a mold at least comprising a cavity and a cover plate, a loading device, a temperature control device, a vacuum suction device, and a flow detection element, wherein the cover plate has a receiving through hole in which an upper permeable sheet and a lower permeable sheet are received, the loading device being adapted to press the upper permeable sheet, a test sample to be tested being laid flatly between the upper permeable sheet and the lower permeable sheet; an air inlet and an air outlet being arranged on the cavity in an up-down direction of the cavity corresponding to the upper permeable sheet and the lower permeable sheet, respectively. The air inlet is communicated with the flow detection element and the air outlet is communicated with the vacuum suction device. The present invention can be applied to achieve accurate test of air permeability of the prepreg plastic matrix in the thickness direction under different pressure and temperature conditions.


Patent
Shanghai Aircraft Manufacturing Co. and Commercial Aircraft Corporation Of China | Date: 2011-12-31

An apparatus for testing the air permeability in the thickness direction of a resin matrix composite material layer includes a mold having a cavity and a covering plate, a loading apparatus, a temperature controlling apparatus, a vacuuming apparatus, and a flow detecting element. An air inlet is connected to the flow detecting element, and an air outlet is connected to the vacuuming apparatus. The covering plate has a through-hole with upper and lower ventilation pieces. The loading apparatus addresses the upper ventilation piece. A test specimen is laid flat between the ventilation pieces. Employment of the present invention allows for accurate testing of air permeability of pre-impregnated material in the thickness direction of the resin matrix composite material layer under different pressure and temperature conditions.


Patent
Shanghai Aircraft Manufacturing Co Ltd and Commercial Aircraft Corporation Of China Ltd | Date: 2011-12-31

An apparatus for testing the gas permeability on the inward facing direction of a pre-impregnated resin matrix composite material layer includes a mold, a loading apparatus, a temperature control apparatus, a vacuuming apparatus, and a flow detecting element. A test specimen is laid flat inside the mold between airtight sealing elements that leave exposed two ends of the test specimen on the inward facing direction of the layer. An air inlet and an air outlet respectively are arranged on the mold and correspond to the two exposed ends of the test specimen. The inlet is connected to the flow detecting element, and the outlet is connected to the vacuuming apparatus. Air is forced to move in a vacuumed cavity along the inward facing direction of the layer. Testing of air permeability of pre-impregnated material in solidification technique is allowed via adjustments of pressure and temperature.


Liu F.,University of Chinese Academy of Sciences | Zhang Z.,University of Chinese Academy of Sciences | Wei Y.,Shanghai Aircraft Manufacturing Co. | Zhang Q.,University of Chinese Academy of Sciences | And 2 more authors.
Optics Express | Year: 2014

We demonstrate the photophoretic trapping of more than several hundreds of absorbing particles by tapered-ring optical traps diffracted from a circular aperture. The experiments with different laser powers show the influence of air flow acting on particles. Three kinds of particles with different densities (about 1-7 g/cm3) and different shapes (spherical, nonspherical) can be trapped. The non-spherical particles (toner particles) disperse in optical field, while the spherical particles (ink droplets and iron particles) arrange as a straight line. More importantly, in the experiments of two counter-propagating tapered-ring beams, the agglomeration of particles is achieved and can help research the dynamics of aerosols. ©2014 Optical Society of America.


Sun X.,Shanghai Aircraft Manufacturing Co. | Shehab E.,Cranfield University | Mehnen J.,Cranfield University
International Journal of Advanced Manufacturing Technology | Year: 2013

This paper presents a knowledge model of the laser beam welding (LBW) in the aircraft industry, which is developed through the utilisation of integration definition for function modelling and concept mapping. The developed knowledge model has been captured in the form of rules and recommendations, which is commonly used as guidelines in this field, and represented with unified modelling language. The LBW component development comprises four key stages, namely, structure design, process planning, fixture fabrication and component fabrication. This has been achieved through the adoption of a three-phase qualitative research methodology: data collection and analysis, knowledge model development and validation. The captured knowledge in the form of rules and recommendations has developed an understanding of the LBW in the aircraft industry and improved the structure design and process planning from joint type selection, structure dimension definition and process parameter optimisation, etc. A prototype handbook has been developed based on skin-stringer connection of aircraft fuselage to guide designers and engineers directly in developing laser beam-welded fuselage panels. The procedure of knowledge modelling for the LBW as well as the methods and tools adopted can be applied to other processes. The developed knowledge model has been validated through a case study. © 2012 Springer-Verlag London Limited.

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