According to the multi-supported structure feature of high-speed flexible rotor and with the demand of rotor dynamic design, the influence of the bearing looseness on the rotor dynamic was analyzed. The nonlinear vibration response characteristics of the high-speed flexible rotor system were obtaine...

To solve power-matching problem during takeoff stage of folding wing flying car, the basic dynamic control strategy was studied.The dual-mode driving characteristics during takeoff stage were analyzed through theoretical calculation, and the concept of the optimal switching time was proposed.Based o...

The acquisition of the satellite signals is the key step of baseband signal processing in the receiver. The speed of the acquisition has a serious effect on the time to first fix (TTFF).According to the parallel code phase search (PCPS) method based on fast Fourier transform (FFT), the sparse Fourie...

Meteorological factors are significant to aviation flight. To investigate the fuel efficiency in aviation flight, base of aircraft data (BADA) model was combined with meteorological factors, and the aircraft fuel consumption correction model was built. Taking the example of one inbound flight approa...

In order to make receiver autonomous integrity monitoring (RAIM) technique be applied to approach with vertical guidance (APV) flight phase in civil aviation navigation, the BDS/GPS combined navigation RAIM algorithm is studied. An algorithm based on the optimal weighted average solution of BDS/GPS ...

Launch mode of the stratospheric airship is the prerequisite factor to safely reach the target altitude. In this paper, a dynamics model for the launch process of stratospheric airship is firstly established, and the analytical solution method is put forward, and the quantitative analysis is carried...

A joint optimization algorithm was proposed for radar target detection and tracking with Rao-Blackwellized Monte Carlo data association. Rao-Blackwellization made the separation of single target tracking and data association, where the data association was solved by the sequential Monte Carlo method...

The mechanism of the upstream blade row affecting the flutter characteristics of the rotor blade is studied, using the self-developed unsteady fluid-solid coupling numerical simulation program. The influence coefficient method is used to analyze the effect of axial spacing on the aeroelastic stabili...

The spinning missiles are subjected to external disturbances and uncertainties during flight, and there are the aerodynamic cross-linking, inertial cross-linking and control cross-linking. To realize stable flight, it is necessary to design decoupling controller. Therefore, a decoupling control meth...

As an emerging simulation technology in the field of system modeling & simulation, equipment parallel simulation has become research emphasis. In the field of equipment maintenance support, the outstanding problem of equipment remaining useful life(RUL) prediction is analyzed, i.e., the stable m...

This paper proposes a control strategy which combines adaptive sliding mode control (ASMC) with input shaping technology for the solar array drive system (SADS) to improve the angular position control performance and suppress the flexible vibration. To improve the angular position control performanc...

Winding machine is the core equipment for filament winding with the features of high production efficiency and stable product quality. To meet the requirements of customized and small batch production, the modular design method (MDM) is proposed to expand the function of winding machine. The system ...

An averaged orbital dynamics model for a natural satellite aerobraking was established and an Titan explorer was simulated to study the notable planet's third-body gravitational perturbation during the process. Firstly, non-singular Milankovitch elements were introduced to represent the orbital moti...

The rule of mass diffusion of CO₂ in jet fuel is an important consideration in the research of the aircraft fuel tank inerting system. A pressure-decay test apparatus was constructed to measure the diffusion coefficient of carbon dioxide in RP-3 jet fuel by monitoring the pressure variation at const...

Effectively forecasting the failure data in the usage stage is essential to reasonably make reliability plans and carry out reliability maintaining activities. Beginning with the historical failure data of complex system, a long short-term memory (LSTM) based recurrent neural network for failure tim...

In order to break through limitatiions in actual testing, the extension method of frequency range of a transverse electromagnetic (TEM) cell is studied. Using the theory of electromagnetic field and microwave technology, the influence of adding slots to the cell on the higher order modes is analyzed...

With the increasing complexity of microprocessor architecture, the design space is growing exponentially and the software simulation technology is extremely time-consuming. Design space exploration becomes one major challenge when processors are designed. The paper proposed an efficient design space...

In view of the complicated multiple fault diagnosis problems and difficulties in the realization of multiple fault direct processing algorithm, on the basis of testability D matrix and single fault algorithm, a novel multiple fault diagnosis and maintenance strategy based on translating into single ...

The collision probability of space object is an important information for judging whether a collision occurs in the space debris collision warning, and is important for the maneuvering avoidance of the spacecraft. Based on the Laplace transformation and the definition of the power series, the collis...

The ability of data transmission and processing is an important factor in the construction of the moon-based platform. How to transmit the observation data to the earth station efficiently and accurately is a critical step to carry out the further researches. Through the joint simulation of STK and ...

In order to discuss the defects of flower pollination algorithm (FPA) in solving multimodal optimization problems, the optimal disadvantages of flower pollination algorithm in multimodal function optimization were qualitatively analyzed by defining population diversity and difference index. And then...

This paper focuses on the cooperative control problem in formation reconfiguration of multiple flight vehicles, and the method of integral sliding mode control (ISMC) based on switching communication topology is investigated. The multiple flight vehicle system is modeled involving the connecting of ...

It is universally acknowledged that SMC based on simplified patterns extracts less triangles than the standard MC. Because only in-cube decimation was exploited, SMC is not able to take full advantage of local features of isosurfaces. Based on this observation, a new method named OSMC is presented i...

First-principles calculations based on density functional theory are used to study the segregation of metallic and nonmetallic elements as well as their interactions on the grain boundary (GB) of nickel. Two typical GBs are constructed:close-packed GB and quite open GB. According to the solution ene...

In this paper, we reported the synthesis of high purity V₂AlC by pressureless sintering with V, Al and C mixed powders. The reaction paths were studied and discussed according to the phase transformation at different sintering temperatures. Besides, the effect of sintering aid NaF on singtering proc...

In order to improve the friction and wear properties of Zn, Cr₂AlC ceramic particle reinforced Zn matrix composites were prepared by hot pressing method. The effects of Cr₂AlC content on the metallographic structure, Vickers-hardness, relative density and tribological properties of the Zn-based comp...

Immune response is one of the critical factors to limit implantable biomaterials' application. In this study, two kinds of collagen membranes for bone regeneration were evaluated in terms of immunological response in vivo, which is hoped to lay foundations for clinical trials. At day 14 following su...

Aimed at the subjectivity of the selection of target weights, multi-objective reliability design optimization approach based on competition game is proposed. In this approach, every design objective is treated as the corresponding game player, and the random design variable set is decomposed into mu...