News Article | May 5, 2017
In what could be the most significant development in global commercial aviation since the prototype of the first Airbus airliner (the A300) made its maiden flight in late 1972, the Commercial Aircraft Corporation of China’s (Comac’s) C919 single-aisle airliner made its first flight, from Shanghai Pudong International Airport, at 14.00 local time on Friday. The new aircraft is powered by two CFM International Leap-1C engines. The flight lasted one hour and 19 minutes, with the aircraft touching down at 15.19 local time. As planned, it kept its undercarriage down for the entire flight. The five-strong flight test crew were charged with checking 15 parameters during the flight, and, after the flight, Comac reported that all these tests had been successfully carried out. Chinese State television reported, before the flight, that the aircraft would not exceed an altitude of 3 000 m and not fly faster than 300 km/h. The company plans a 4 200 flight test campaign, using six aircraft. The C919 is currently scheduled to enter commercial service in 2020 with launch customer China Eastern Airlines. So far, Comac has received orders for 570 of the new airliners from 23 customers, most of them from Chinese airlines and leasing companies. The C919 will be able to carry up to 168 passengers. It will have a range of between 4 075 km and 5 555 km. Chinese media report that a C919 will cost some $50-million, said to be less than half the price of an Airbus A320 or a Boeing 737. Comac has applied for Type Certification for the C919 from both the Civil Aviation Administration of China and the European Aviation Safety Agency. The latter step confirms the company’s intention to market the aircraft internationally. The C919 is, indeed, designed and intended to compete with the Airbus A320 family and the Boeing 737 family. China hopes, in the course of time, to convert the current international airliner duopoly of Airbus and Boeing into a triumvirate, by making Comac a major manufacturer as well. The C919 project was launched in 2008. Originally, it had been hoped that it would make its maiden flight in 2014, but this was postponed to late 2015 and then postponed again. The aircraft was publicly unveiled in November 2015. It was finally moved to the company’s Flight Test Centre in December. In March, the Xinhua News Agency reported that its was technically ready for its first flight. However, the C919 is not the first Chinese-assembled modern commercial jetliner to take to the skies. That honour belonged to an Airbus A320, assembled at the group’s Tianjin Final Assembly Line (FAL). The Tianjin FAL is a joint venture between Airbus, the China Aviation Industry Corporation and the Tianjin Free Trade Zone. (Tianjin lies on the coast of north-east China.) Boeing has signed an agreement with, perhaps ironically, Comac, to set up an Aircraft Completion Centre for the 737, in the city of Zhoushan, south of Shanghai. This centre will not assemble the airliners, however; it will fit out new aircraft assembled and flown in from the US with cabin interiors and paint them in the customer-airlines liveries. Chinese companies also supply components and parts to both Boeing and Airbus.
News Article | November 23, 2016
ISO management system was straining on 19th November 2016 welcomed trainees from domestic cities to Yuanyang Conference Hotel in Shandong, China. The goal of ISO management system training is to lead the conversation in the new specified aerospace industry. “The aerospace industry has new opportunities for ISO Management System Standards,” Zhang Juan, Partner of AVIC Beijing Certificate Center Co.Ltd. Shandong Brunch said. “We used to serve clients in education, manufacture, and petrol; currently more specialize in aerospace like unmanned aerial vehicles.” An unmanned aerial vehicle (UAV) is an aircraft that carries no human pilot or passengers. UAVs — sometimes called “drones” — can be wholly or partly autonomous but are more often controlled remotely by a human pilot. ISO management system standards provide a model to follow when setting up and operating a management system. Like all ISO standards, they are the result of international, expert consensus and therefore offer the benefit of global management experience and good practice. The training sessions educate trainees to understand better about the unmanned aerial vehicle and be more aware of the ISO management system standards. About Beijing Certificate Center Co.Ltd. Shandong Brunch The Aviation Industry Corporation of China (AVIC) was founded on November 6th, 2008 through the restructuring and consolidation of the China Aviation Industry Corporation (AVIC) and the China Aviation Industry Corporation Ⅱ (AVIC Ⅱ). We are centered on aviation and provide complete services to customers in many sectors - from research and development to operation, manufacturing and financing. Our business units cover defense, transport aircraft, helicopters, avionics and systems, general aviation, research and development, flight testing, trade and logistics, assets management, finance services, engineering and construction, automobiles and more. We have over 100 subsidiaries, nearly 27 listed companies, and more than 450,000 employees. In 2016, AVIC ranked 143th among the newly published Fortune Top 500 Enterprises.
Xiang H.-H.,China Aviation Industry Corporation |
Ren M.-L.,China Aviation Industry Corporation |
Ma H.-W.,Beihang University |
He X.,Beihang University
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2011
To reveal the physical mechanism controlling the influence of a blade profile probe on the aerodynamic performance of a transonic compressor, studied in detail was the variation law of the performance characteristics and the inner flow field of a compressor at its design speed before and after a probe is installed by using a 3-D numerical simulation method and through establishing a calculation model for a 1.5-stage compressor with a multi-point-real-entity probe. The research results show that after a probe is locally installed on a stator blade between stages, the flow rate of the compressor at the lower choke point decreases by 0.1%, the maximal efficiency drops by 0.4% and the flow rate at the stall point increases by 0.15%. A change of the attack angle of the stator blade caused by a change of the working point of the compressor constitutes an important factor influencing the area of the flow going around the probe at both sides of the blade surface and a relatively high correlation degree exists between the probe-going-around flow influencing extent and the aerodynamic load of the stator blade. A large area probe-around-going flow will exacerbate the radial migration and separation of the boundary layer at the root on the back of the blade at the downstreams of the rotor constitutues the root cause of the aerodynamic stall of the compressor at an earlier time.
Zhao S.,Tianjin University |
Zheng J.,Tianjin University |
Shi B.,Tianjin University |
He L.,China Aviation Industry Corporation |
Liu Z.,Tianjin University
Journal of Materials Science: Materials in Electronics | Year: 2016
In this paper, La0.8K0.2MnO3 powder was synthesized by sol–gel method. The phase structure, morphology of the composite have been characterized by X-ray diffraction, field emission scanning electron microscope. Testing of the microwave absorption was carried out by using the network analyzer Agilent HP-8722ES at room temperature. The results show that the La0.8K0.2MnO3 powder has excellent absorbing property. The maximum reflection loss is −33.51 dB at about 12.22 GHz with a thickness of only 1.25 mm. Moreover, the bandwidth with the reflection loss above 10 dB reaches about 2.1 GHz. © 2016 Springer Science+Business Media New York
Jiang F.,Tianjin University |
Zheng J.,Tianjin University |
Liang L.,China Aviation Industry Corporation |
Zhang M.,Tianjin University |
Wang Y.,Tianjin University
Journal of Materials Science: Materials in Electronics | Year: 2015
We synthetize La0.1Ca0.9MnO3 particles with porous microsphere shape through co-precipitation method. The crystal structure and morphology were characterized by XRD and SEM respectively. The particles are orthorhombic calcium lanthanum manganese oxide with porous microsphere shape which is less talked. The test of microwave absorption was carried out by using the network analyzer Agilent HP-8722ES. The microwave absorbing peak is 31 dB at 11.5 GHz and the effective absorbing bandwidth above 10 dB reaches 1.9 GHz in the 11.1–13 GHz. The microwave absorption can be attributed to both the dielectric loss and the magnetic loss, but the former is greater than the latter. © 2015, Springer Science+Business Media New York.
Zheng J.,Tianjin University |
Song X.,Tianjin University |
Liu X.,China Aviation Industry Corporation |
Chen W.,Tianjin University |
And 2 more authors.
Materials Letters | Year: 2012
We present a facile method to synthetize CoFe 2O 4/ZnO nanoparticles with hexagonal shape through high temperature hydrolysis of chelated zinc diethylene glycol alkoxide complexes in alkaline Diethylene Glycol solution in the presence of CoFe 2O 4 nanoparticles. X-ray diffraction data show that the obtained nanoparticles are composed of CoFe 2O 4 and ZnO. The hexagonal particle morphology of the resulting nanoparticles was analyzed using transmission electron microscopy, indicating that the shape of the nanoparticles is hexagonal with a mean diameter below 100 nm. Electromagnetic parameters in GHz frequency range was measured by a network analyzer, which reveals that magnetic and dielectric properties are combined due to both the interfacial polarization process and multiresonance in the as-prepared hexagonal CoFe 2O 4/ZnO nanoparticles. © 2011 Elsevier B.V. All rights reserved.
Xu X.,China Aviation Industry Corporation |
Zhou J.-H.,China Aviation Industry Corporation |
Zhang Y.-D.,China Aviation Industry Corporation |
Sun Y.,Engine Co.
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2016
With a split-shaft gas turbine generator unit serving as the prototype, the dynamic characteristics of the gas turbine were analyzed by using the multi-loop feedback PI control and compressor inter-stage air bleeding technology under the condition of the unit being forced to shed its load. In the meantime, according to the volume and inertia method, a nonlinear mathematic model for gas turbines was established and then in accordance with the model thus established, a model for simulating the dynamic performance of a gas turbine was built by making use of a Matlab/simulink platform. The test and simulation results show that the above-mentioned split-shaft gas turbine has an ability to suddenly reject 80% of its rated load. Among them, when the load of the gas turbine is 20%, its control quality is relatively ideal. The simulation model can correctly reflect the dynamic characteristics of the gas turbine under the condition of the gas turbine subjected to a big disturbance, thus meeting the precision and real-time requirements for dynamic simulation. © 2016, Harbin Research Institute. All right reserved.
Liu J.,China Aviation Industry Corporation |
Ye D.,Zhejiang University |
Zhang L.,China Aviation Industry Corporation |
Xiao L.,Zhejiang University
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2012
The aircraft, engine and other key load bearing structures are often subjected to variable-amplitude fatigue loading in the course of their services. Direct measurement and analysis of the residual stress field near a crack tip caused by plastic deformation due to overload is of great value for a better understanding of fatigue crack growth behavior under variable-amplitude loading, and thus for the improvement and development of a fatigue life prediction model. Based on the microscale depth-sensing indentation (DSI) residual stress measurement technique, this paper studies the practical testing of the residual stress field near a fatigue crack tip, obtaines the distribution of residual stress field near it in fatigue crack propagation process for a middle-crack tensile specimen of an aluminum alloy under constant amplitude and single peak overload. Also, it analyzes the residual stress distribution near the crack tip using the elastic-plastic finite element method under the same fatigue loads. Mutual authentication indicates that the results obtained by the two different ways agree well with each other.
Dong A.-Q.,Nanjing University of Aeronautics and Astronautics |
Fang X.-D.,Nanjing University of Aeronautics and Astronautics |
Huang Y.-K.,China Aviation Industry Corporation
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2016
With respect to the calculation of the pool boiling critical heat flux density, a great many of correlation formulae were proposed. In the design of engineering projects, it is necessary to be aware of the adaptability of these correlation formulae and to analyze the currently-available calculation methods in the study of a new calculation model. The test data and the number of the correlation formulae involved in the evaluation and analysis of the currently available formulae are limited, leading to a great difference between the evaluation results. A total of 468 groups of data were collected from 27 literatures and used to compare the accuracy and applicable range of the commonly-used 20 critical heat flux density calculation formulae and the formulae in comparatively good agreement with the test data were sifted out. It has been found that El-Genk-Guo formula, which is the best of all, has an average absolute error of 26.2%. To this end, it is necessary to find out a more accurate formula. Moreover, the factors influencing the accuracy of the formulae were analyzed, thus offering reference for proper design of relevant equipment items. © 2016, Editorial Department of "Journal of Engineering for Thermal Energy and Power". All right reserved.
Sun S.-L.,Northwestern Polytechnical University |
Chen R.,China Aviation Industry Co. |
Sun L.,Northwestern Polytechnical University |
Yan J.,Northwestern Polytechnical University
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2011
Firstly, three different infrared simulate thinking was analyzed, and through the comparing, a promote method based on Vega Prime (VP) engine was purposed. Then, according to the synthesizing of experience data and thermodynamic balance model, the tank radiation field with both internal thermal source and no internal thermal source was given. Meanwhile, the simulation methods of key modules were accomplished. At the end, the result of experimentation of three different thinking shows that each of their infrared tank target images carved representative signification. The characteristic of three thinking were achieved through the comparing with the real infrared images. These outcomes show an authentic depiction of the experimentation, which has taken on an application value as well.