Abstract:Mistuned blisk assemblies are of important influence on vibration design,reliability and integrity of aircraft engine.Advances in mistuned blisk research are presented in this paper.Some hot topics such as modeling,localization,mistuning optimization with sensitivity,nonlinearity,mistuning identification and flutter etc are reviewed in detail.The development of latest research methods and achievements are summarized.The important emerging directions,for example,the influence of coriolis force on mistuning a...

Abstract:The design of civil airliner is mainly to the shape design of the airliner in cruise state,so jig shape should be obtained by the correcting method of aeroelasticity,to ensure the aerodynamic performance of the airliner when it is flying in cruise.In this paper,a static aeroelasticity analysis method is developed by the coupling solving hybrid grid-based N-S equation and structural flexible matrix method.Based on the linear structural reversibility and considering the mass distribution,engine thrust and wei...

Abstract:With the advancement of aircraft and aeroengine performances,active controls in boundary layer separation play an important role and become irreplaceable.Through its small-scale and partial energy injection,especially control of near critical point,flow structures could be greatly manipulated.The accurately phase control in complex dynamic system has been received more and more research interests in recent years.Synthetic jet actuator,plasma technology and electromagnetic force are introduced in detail in t...

Abstract:Genetic algorithm,which is a mature aptitude algorithm,has been widely applied to airfoil design.In this paper,the standard genetic algorithm is improved by encoding genetic operators and initialization,So that the DNA encoding includes more information;the Latin hypercube sampling distribution of the initialization population is more reasonable;insertion,deletion and inversion operators increase the diversity of the population to accelerate convergence;infection operator gets rid of stagnation or premature...

Abstract:In order to meet the design requirement and aim of civil jet,a computing framework optimization of civil jet conceptual design is developed.Based on the empirical methods of the individual disciplines including geometry,propulsion,mass,aerodynamics,performance,control and cost,the computer codes for each discipline are developed.The global analysis code for civil jet conceptual design is obtained by integration of the codes for each discipline,and an integral conceptual design analytical model is presented....

Abstract:Starting from the governing equations of rigid body dynamics,the virtual acceleration principle and virtual force principle of rigid body dynamics are derived in this paper by using variational integral method.Then the two principles of rigid body dynamics are derived again from the virtual acceleration principle and virtual force principle of system of particles using the infinitesimal element method and a comparison of the two ways of derivation is made.The derivations in this paper are performed from the...

Abstract:The response surface method and method of lattice are combined for low-speed airfoil drag-reducing design,and the principles of response surface method and method of lattice are introduced in this paper.The advantages and disadvantages of the method are described.Flow field around airfoil are analyzed using the Navier-Stokes equations numerical simulation in which finite volume discretization is done and five-step RUNGE-KUTTA time stepping is carried out.The lift and drag are calculated by integrating of th...

Abstract:Amount of advanced composite materials(ACM) used in the aircraft structure has become one of the advanced signs of aerospace structures design.ACM excellent overall performance suffices for future aircraft needs.In this article,the applications of ACM on aerospace structure along the development process is summarized,combining with the future aircraft development trend,the possible new challenge or new opportunities of the application of ACM to future aircraft are forecasted.

Abstract:The finite element model of flexible airframe is created firstly,its mode coincide with leuven modal test system(GVT) test.Then the buffer force is analyzed and program is compiled to calculate the relevant curve.On the LMS simulation platform a single landing gear drop is simulated by using this curve.Based on the single landing gear drop simulation,which coincides with the drop test,the whole aircraft drop test simulation is done including rigid airframe and flexible airframe.Through the comparison of the...

Abstract:This paper deals with the load transfer and fastener load distribution of the multiple-bolted joints by means of the experimental study and finite element analysis.The specimens are the composites to titanium double lap joints with a column of three bolts.The fastener load distribution and the its alteration with external loading are determined in the experiments by the strain gauge measurement.Then the three-dimensional finite element model consisting of multiple contact interfaces is established.The effec...

Abstract:Design on lightweight of main connecting component is a very crucial factor in aircraft structure design.The path of force transfer of aircraft bulkhead is studied,the concept of structural load-carrying factor is introduced,and its path of force transfer is quantified to get the best path of force transfer.Compared with the traditional structural size optimization design method,the proposed optimization method only needs to consider the structural shape and load,without thinking the size of structural deta...

Abstract:In resent years,integrally stiffened panel has already been a new research direction in aircraft structure design.For a typical integral panel of aircraft,the parameters model of the panel with cracks is established.Three dimensional crack growth trajectories in the skin pad and the stiffener are then simulated.Changes of the stress intensity factor in the skin,the pad and the stiffener,as cracks grow,are analyzed by use of finite element method.The conclusions drawn in this paper can be used for damage tol...

Abstract:CAT Ⅲ自动着陆在恶劣天气进场着陆时具有较高的安全性和可靠性,对此类运行机载设备的研究具有重要的意义。本文首先从基本概念及原理出发介绍了进场着陆等级的划分、故障—性能下降和故障—工作两类自动着陆系统以及完成自动着陆的机载自动飞行系统及设备,然后指出决断高度DH和跑道视程RVR对CAT Ⅲ自动着陆机载设备的限制,最后介绍了机载自动着陆系统精度、性能、完好性及有效性四方面的适航性要求,只有通过了适航验证的飞机才可以运行CAT Ⅲ自动着陆。

Abstract:Although using integrated electrical-mechanical control system(IEMCS)makes design work harder,it is worthy because it can be easier to reduce the quantity of equipments,share data,and reduce the quantity and weight of wires based on IEMCS.Because of these advantages,IEMCS is the trend of the future.IEMCS is widely used in B787 and A380 project,involving hydraulic,fuel,landing gear,water/waste system,etc.The system based on IEMCS has lots of changes in system architecture and user experience compared with on...

Abstract:The flow field between two rotors under the rotating-speed difference in the counter-rotating compressor will affect the compressor performance.In this paper,some rotating-speed differences are measured and tested on a dual-stage axial counter-rotating compressor by using the particle image velocimetry(PIV) technique to describe the rotor-rotor interaction of flow field structure.The results of analysis show that the unsteady flow fields under the different rotating-speed differences and phases are varied e...

Abstract:In this paper,the combustion wave is produced by a pulse gun in the liquid rocket engine combustion chamber;the pulsating pressure and mechanism vibration of the chamber are recorded by the experimental data record and analysis system;and the damping ratio of pulsating pressure is obtained.The damping ratio is compared with parameter of congener engine.The experimental result indicates that the combustion process of the engine chamber is stable for pulsate disturbing.

Abstract:At first the characteristics of controller area network(CAN) bus are described,and contrastive analysis with the 1553B bus,which has been used most maturely,is given in this paper.In the aviation domain,especially in the airborne electromechanical system,the partial use of CAN bus is of feasibility.Then it is pointed out that CAN bus should be improved on the reliability and real-time for the on-board requirements.Finally,combining with CANaerospace and ARINC825,some key points for improving on CAN bus appl...

Abstract:To deal with the problem of arrival scheduling and sequencing(ASS) is the main way to keep air traffic unobstructed and reduce flights delay.According to the characteristics of ASS problem,an object function with total delay is developed,an improved genetic algorithm based on Grefenstette coding and receding horizon control strategy is proposed,then the scheduling model with genetic algorithm is simulated in this paper.The results of the simulation show that compared with first come first serve(FCFS) algori...

Abstract:The shortcoming of both expert's risk measurement method,which is artificial and subjective,and artificial neural network method with pure subjectivity are overcome in this paper.Combined with the advantages of both expert's risk measurement method and artificial neural network method,using Microsoft Visual C++ neural network based on BP algorithm procedures,through a large number of successful risk assessment cases of training data which estimated by experts,the aviation model project risk prediction model...

Abstract:自20世纪60年代以来,美国、俄罗斯等发达国家开始研究等离子体的性能.近年来,以美国为首的西方国家在航空等离子体动力学与技术的研究取得了突破性的进展,国内相关研究也取得了一些进展和自主创新.本文主要介绍了空军工程大学等离子体动力学重点实验室的等离子体流动控制技术研究成果,主要包括改善飞行器气动性能和推进效能、等离子体冲击波与强流离子注表面强化、磁流体动力、等离子体点火助燃等技术,并指出了未来发展中需要解决的重大问题.