Abstract: To calculate the integral sub-stiffened panel buckling load in the preliminary design stage quickly, a simplifying approximate calculation method based on some reasonable assumptions was proposed. The perfect rectangular sub-stiffened panel simply supported on four sizes was used as investigation ob...
Abstract: Software-based LZMA (Lempel Ziv Markov-chain algorithm) nondestructive compression algorithm is very slow and consumes too much CPU (central processing unit) resources during the data compression process, as a result it can not meet the requirements of real-time systems. On the basis of the improved...
Abstract: Automatic detection and extraction of the building area is an important aspect of unmanned aerial vehicle (UAV) image processing. Based on the detailed analysis of UAV imaging characteristics and the maximum stable extremal regions (MSER) algorithm, a building area extraction algorithm of UAV image ...
Abstract: In order to solve the current problems (expensive testing cost and low efficiency of test case generation) in mutation test for Simulink models, a mutation testing process and an optimized set of mutation operators were proposed for Simulink models based on program mutation according to the current ...
Abstract: According to the application requirements of aircraft automatic assembly and the principle of metamorphic mechanism, a double eccentric source metamorphic mechanism was presented. On the basis, a autonomous mobile drilling mechanism with metamorphic function was designed, and the switching of changi...
Abstract: Wear of swash plate-slipper moving pair (slipper pair) of hydraulic axial piston pump results in increasing leakage, declining efficiency, and finally shorting the lifetime. An accelerated lifetime test method was presented based on the elasto hydrodynamic lubrication (EHL) wear model. As the most i...
Abstract: The accuracy pose of robot base frame with respect to the world frame needs to be calibrated under the task of multi-arm cooperation, identification of kinematics parameter and off-line program of robot. An accurately calibration method of robot base frame using quaternion form was proposed and appl...
Abstract: Tong detection algorithm is a common used signal detection algorithm. But the overall conclusions about statistical performance and parameter setting of Tong detection algorithm are absent. Aiming at these problems, statistical and recursive analysis methods were used to carry on theoretical analysi...
Abstract: The multi-user characteristic is a key factor for interactive tabletops. Some emerging collaborative patterns emerge during the process of multiple users gathering around interactive table and collaborating face to face. The interface which shows the emerging collaborative pattern is a design paradi...
Abstract: Aircraft load spectrum measured data visual simulation is an important means to identify maneuver and to verify the validity of measured data in flight testing. A data storage method based on logical data channels was put forward to solve the structural differentiation problem of different data sour...
Abstract: The conventional limiting process is mostly based on one-dimensional structure, which cannot keep monotonic features of quantities under conditions of multi-dimensional discontinuities, leading to non-physical oscillations. In order to overcome the structure defects of the conventional methods, mult...
Abstract: A new numerical turbulence simulation method to enhance the credibility of simulation of carrier airwake free-air turbulence components has been presented. At first, the turbulence sequence of each direction was presented as the Euler forward different format with correction factors. Meanwhile, asso...
Abstract: Optimization analysis based on response surface is used in finite element (FE) model updating in recent years. Printed circuit board (PCB) model updating process based on response surface was presented. First six modal frequencies of PCB were calculated using ANSYS and correlated with modal test res...
Abstract: To minimize the effects of artificially chosen variables on optimization results, simultaneous topology and shape optimization (STSO) method was proposed for structural optimization of aero-engine disk at the conceptual design phase. This method was based on solid isotropic material with penalizatio...
Abstract: With the development of the hardware performance of projectors and techniques on computer graphics, projections are used on more common surfaces so as to provide vivid and shocking visual effects. A new method that employed multi-projector system and interactive flat devices to modify the appearance...
Abstract: Take-up roll (TUR) is a key component in amorphous ribbon automatic production line. Take-up rate of TUR determines the ribbon quality and production rate. Because the line speed of amorphous ribbon in the ribbon process is fast and the amorphous ribbon suffers from different resistance, TUR should ...
Abstract: In view of the recent situation that several defects of traditional laser marking code on tool appear such as marking inefficiency, marking quality instability and the harm to workers, a self-adaptive laser marking technology was put forward. The conveyor and V-block of specific structure were desig...
Abstract: According to mechanical resonance problem in flight simulation servo system (turntable system), the principles of resonance suppression about traditional notch filter and second-order low-pass filter were analyzed. Afterwards the two-second resonance suppression digital filter was proposed. The two-...
Abstract: In order to solve the problems that the existing high squint missile-borne synthetic aperture radar (SAR) algorithm can not deal with too high squint angle, and that the calculated amount of traditional back-projection (BP) imaging algorithm is too large, as well as that the current fast BP algorith...
Abstract: The effects of various regulation strategies on the transit fare and frequency in public transit system with information provisionwas studied. Besides two extreme strategies, namely monopoly optimum and social optimum, the rate-of-return strategy and quantity control strategy were also investigated ...
Abstract: Box-like dynamic structures are proceeding at the direction of maximization and flexibility. Vibration transmission characteristics of geared shaft-bearing-housing were studied by finite element method under different excitation conditions for two-stage reducer. Gearbox was used as a flexible substr...
Abstract: An approach of perigee altitude control using aerodynamic force was provided to deal with the decline of perigee during the orbital transfer process of aerobraking. The atmospheric flight control law considering the bank angle as control variable was investigated, and the computer simulation which r...
Abstract: Post-buckling damage of thin plate under compressive load in plan was studied, and the fatigue life of plate was predicted by taking the coupling effect of buckling and fatigue damage into account. Firstly, the finite element model was established, and the critical buckling load and buckling mode we...
Abstract: For the strong nonlinear and variable parameters properties of high bypass ratio turbofan engine, an adaptive PID control method based on optimized extreme learning machine (ELM) was proposed to predict the engine's parameters. To improve the prediction accuracy and the real-time property of ELM, an...
Abstract: Focus on the problem that the actual service life of brake disks is always shorter than the calculated data underground test, made use of the friction coefficient curves and took the actual statistic using boundary of carbon brake disk to fit a friction coefficient curve of unsteady discontinuous br...
Abstract: In view of the fact that aero-engines have complicated structure and multiple failure modes, traditional methods are difficult to meet the requirements. A forecasting method for aero-engine failure risk based on Monte Carlo simulation is presented, which is used to evaluate the possibility of failur...
Abstract: To assess the reliability life of a fleet, the scatter of the load spectrum must be considered. In this paper, 56 individual load spectra are compiled based on the acceleration-exceedance curves corresponding to a fleet of Fokker F27. With the application of the SWT formula and linear accumulative d...
Abstract: The computational cost of the tracking algorithm based on the sparse representation is so much large, at the same time, the target apparence changes on account of a variety of reasons,which makes the object tracking process complicated and time consuming. A joint model is reasonably proposed by comb...
Founded: 1956 (
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Sponsor: Ministry of Industry and Information Technology of the People's Republic of China
Sponsored by: Beijing University of Aeronautics and Astronautics