Mao Y.-L.,Beihang University |
Kang R.,Beihang University |
Ma L.,Beihang University |
Xu Z.-H.,Avic Aerospace Polytechnology Establishment
Advanced Materials Research | Year: 2010
The theory of system multi-state is used in the time-based maintenance strategy, the determine process of product state for component-level and system-level is known. The maintenance model for multi-state system which is based on statistical data and risk loss considered is constructed. The investigation index for availability of maintenance strategy is analyzed and then the simulation is used to determine the maintenance strategy. © (2010) Trans Tech Publications.
Zhang Z.,Beihang University |
Kang R.,Beihang University |
Liu R.,Beihang University |
Xu Z.,Avic Aerospace Polytechnology Establishment
Advanced Materials Research | Year: 2010
Based on maintenance support activity, support-activity centered computation model of utilization of non-repairable spares is set up by analyzing their support process; A mathematical model for two-contact closure queuing network was established by the Markov queuing analysis method based on analyzing the operation of a station-spares-warehouse system for support process, and a calculation model of utilization of repairable spares is given; In the end, the model is also used in a numerical study. It is an effective infrastructure theory support for equipment logistics support development department to analysis the spares allocation. © (2010) Trans Tech Publications.
Su D.,AVIC Aerospace polytechnology Establishment |
Feng C.,AVIC Aerospace polytechnology Establishment |
Gong Q.,AVIC Aerospace polytechnology Establishment |
Li Y.,AVIC Aerospace polytechnology Establishment
Proceedings of 2015 the 1st International Conference on Reliability Systems Engineering, ICRSE 2015 | Year: 2015
With the increase of military and civil aircraft system complexity, the shortage of traditional safety analysis technology goes distinctly, while the Model-based Safety Analysis technology attaches more and more importance. Therefore, this paper presents the background, basic concept and research and application situation of Model-based Safety Analysis technology, identifies the benefit of it. This paper also presents a framework of taking Model-based Safety Analysis into airplane safety assessment process, and a case study of performing MBSA in powerplant system is given to shown the effect of MBSA. Finally, this paper analyses the shortage and challenge of Model-based Safety Analysis considering its application in aircraft safety assessment process. © 2015 IEEE.
Wang D.,Tsinghua University |
Wang D.,Airborne |
Wan M.,Zhenjiang Watercraft College |
Pan H.,AVIC Aerospace polytechnology Establishment
Advanced Materials Research | Year: 2012
The time delay between the changed quantity of the injected fuel and the detection of the resulting change of the air-fuel ratio determines the dynamic nature of the closed-loop control for air-fuel ratio, and the response delay of oxygen sensor itself is a main effect factor. The response characteristics of switching zirconia oxygen sensor will change and even deteriorate with the increasing service time of oxygen sensor. In this paper, the response characteristics of switching zirconia oxygen sensor and the impact of response slowing on air-fuel ratio and emissions are studied through engine bench test, the impact of response delay of switching zirconia oxygen sensor on air-fuel ratio control is analysed, and a new controller of air-fuel ratio based on discrete PI controller is proposed. © (2012) Trans Tech Publications, Switzerland.
Huang C.,Avic Aerospace Polytechnology Establishment |
Zeng Z.,Avic Aerospace Polytechnology Establishment |
Liu D.,Avic Aerospace Polytechnology Establishment |
Li F.,Avic Aerospace Polytechnology Establishment
Proceedings of IEEE 2012 Prognostics and System Health Management Conference, PHM-2012 | Year: 2012
Traditionally, the only method to capture, describe and program test requirements in signal-oriented way is using ATLAS (Abbreviated Test Language for All System) language. The IEEE 1641 (Signal and Test Definition) STD Standard provides a new way to define test requirements independently of the language and test station platform. With this approach, instrument-independent test descriptions is no longer simply represented by a special formatted test language, but any languages which build on a framework for component libraries of signal descriptions. This paper studies specific method to implement ATS(Automatic Test System) based on IEEE 1641 STD, including the signal library creation, STD test statements mapping to the methods and attributes of BSCs(Basic Signal Component) and TSF(Test Signal Framework) signals, signal objects creation for particular TPL statements, signal-oriented test descriptions conversion to instrument setting etc. © 2012 IEEE.
Hou C.,AVIC Aerospace Polytechnology Establishment |
Wang Q.,AVIC Aerospace Polytechnology Establishment |
Ren Z.,AVIC Aerospace Polytechnology Establishment
ICRMS'2011 - Safety First, Reliability Primary: Proceedings of 2011 9th International Conference on Reliability, Maintainability and Safety | Year: 2011
Today, more and more software-intensive equipments are used in weapons, and their reliability is gradually being looked closely. For these equipments, software and hardware are coupling; their reliability can't be verified separately. Design testing profile is an important work to reliability verification. Hardware test profile design method is mature relatively. Software test profile design and test case generation method is developing. Although several operation profile construction methods have been proposed, they are not fit for hardware & software (SW&HW) co-testing. This paper combines testing profile of hardware, with utilized information of mission profile and environment profile, divides operation profile into three layers and model by diverse UML diagrams. This method considers both input parameters complexity and real-time requirements. It can be used in operation profile design and test case generation of SW&HW reliability co-testing. © 2011 IEEE.
Zhao F.,Beijing University of Posts and Telecommunications |
Luo H.-Y.,CAS Institute of Computing Technology |
Lin Q.,Avic Aerospace Polytechnology Establishment |
Ma Y.,Beijing University of Posts and Telecommunications
Tongxin Xuebao/Journal on Communications | Year: 2010
To position indoor objects accurately and robustly, a novel node localization based on kernel function and Markov chains was presented, which employs Bayesian filter framework and radio fingerprinting technology. It uses kernel function to construct likelihood function to take full advantage of the similarity between observation and several training samples, which avoids the error brought by employing a priori determined distribution model. Furthermore, the proposed algorithm uses Markov chains to improve the localization accuracy and shorten the positioning time. It limits the search space of the matching grids with object's previous state and the environment layout, and refuses the object's impossible position jump during the moving process. Experiments confirm that the proposed localization outperforms the algorithm with Gaussian distribution model.
Zheng Z.-T.,Beihang University |
You Y.-L.,Beihang University |
Liu X.-L.,Aerospace Research Institute of Materials And Processing Technology |
Zhang Z.,Beihang University |
Lu H.-T.,AVIC Aerospace Polytechnology Establishment
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2013
Based on the macroscopical propagation site area and microscopic fatigue striations of the fatigue fracture of titanium alloy joint with electron beam welding, fatigue stress and initial fatigue quality (IFQ) was estimated, respectively. The results show that the area of propagation zone can well estimate the stress at the same fracture toughness. And the relative error can be confined less than 10%. The microscopic characteristic of fatigue crack propagation at the second stage if fatigue striation. The IFQ estimated through Paris formula presents a normal distribution and the results have important engineering significance for the assessment of electron beam welded titanium alloy structure.
Zhao N.,Beihang University |
Zhao N.,China Shipbuilding Information Center |
Zhao T.-D.,Beihang University |
Feng C.,AVIC Aerospace Polytechnology Establishment
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2014
The key point of dynamic reconfiguration system safety mechanism analysis is the system complex characteristics. The characteristics are reflected in the dynamic change of the functional subject. This change leads to difficulty in obtaining the dynamic reconfiguration system safety mechanism which is the system failure state evolution process leading the system to hazard. This paper first analyzes the multi-state-space problem caused by functional subject changing of the dynamic reconfiguration system. Then a hazard guided multi-failure analysis method is proposed based on the problem above. This method could help analyze the system safety mechanism, and obtain the development process of system failure state. At last, a study on a dynamic reconfiguration avionic system is conducted to illustrate this system safety mechanism analysis method.
Liu X.,Avic Aerospace Polytechnology Establishment |
Tang X.,Shanghai Aircraft Design and Research Institute |
Su D.,Avic Aerospace Polytechnology Establishment
WIT Transactions on Engineering Sciences | Year: 2014
To improve the normalization, conformity, and efficiency of system safety analysis and assessment for complicated aircraft system, analysis or assessment techniques based on formal model was needed. Studies were started from standards to identify the overall process and requirements of system safety. Technologies such as model-based system engineering, model-based development, model-based safety analysis, and finite state machine were also involved. After investigating and summarizing the characteristics of Chinese aircraft development, procedure and means of safety analysis and assessment for complicated aircraft system based on formal model were proposed in this paper. These procedure and means could provide significant improvements for Chinese aircraft development, and this paper accomplished an engineering case for a landing gear system to describe and justify their application. © 2014 WIT Press.