Considering that traditional strap-down inertial/celestial integrated navigation system (SINS/CNS) cannot accurately estimate the accelerometer bias, which can cause the divergence of navigation errors, a strap-down inertial/celestial integrated navigation method based on the stellar refraction (SIN...

For the problem of particles degeneration and lack of diversity in standard interacting multiple model particle filter (IMMPF) algorithm, a novel algorithm is presented, which is referred to as interacting multiple model particle filter optimization resampling (IMMPFOR) algorithm using linear optimi...

Aimed at the low design precision and larger gap with actual load profile in missile life extension test, a missile vibration spectrum design based on inverse pseudo-excitation method was put forward. First, four-degree-of-freedom vibration model of missile-suspension system was established, and the...

The performance degradation of airborne fuel pump is nonlinear and multi-stage with stationary-accelerated-stationary degradation pattern. The existing degradation models are unsuitable for the modeling of this degradation problem in life cycle, so the signal output from the pressure sensor attached...

To improve the effect of 3D visualization for electromagnetic environment, this paper proposes a grid projecting algorithm that makes fusion of ray-casting volume rendering with isosurface rendering for electromagnetic environment. The isosurface is transformed into a layer of grid and then the grid...

The transfer of a spacecraft between coplanar orbits under continuous constant thrust with minimum fuel consumption was investigated. A control equation of the optimal trajectory, which the steering angle must satisfy, was derived by using maximum principle. Combining the control equation with dynam...

The heat release rate of single lithium-ion battery measured by the commonly used experimental method is not able to reflect the heat losses caused by the domino effect and the intermittent changes during the transfer process of a large number of lithium-ion batteries within the air transport packag...

Aimed at the situations of the spreading and moving dynamics behavior of the droplet that plays an important role in industrial production and microfluidic chips, an elastic planar model based on the theory of ultrasonic travelling wave was proposed. The droplet on the elastic glass surface was driv...

Vanadium (V) is identified as a promising candidate of the structural materials in fusion reactors. Experimental results have demonstrated that the impurity oxygen (O) has great influence on the structure and mechanical properties of V. Employing a first-principles method based on the density functi...

To implement multi-parametric sensitivity analysis and multi-parametric classification of air-breathing hypersonic vehicle and reduce the complexity of design, parameterized shape generation of air-breathing hypersonic is performed. First, the orthogonal design of experiment is used to generate the ...

Fatigue crack propagation behavior in typical corrosion environments is the precondition of damage tolerance design for metallic structures in aircraft; therefore, in order to determine corrosion fatigue crack propagation behavior, fatigue tests were performed on three categories of aluminum alloys ...

Missile countermeasure optimization problem for fighter aircraft was studied. The missile countermeasure optimization was modeled as a sequential decision-making problem under uncertainty, and a Markov decision process (MDP) based approach was proposed. First, the engagement process was divided into...

For repair optimization of system with periodic inspection, we need to not only consider the system reliability information, but also make full use of the inspection data and optimize the inspection period. A multi-state parallel repairable system was taken as the research object, and the system ins...

Aimed at the outstanding issue of angular velocity extraction from useless information, which is caused by gradient hot phase of traditional interference grating gyro, a multiple weak links fan shaped superfluid interference grating gyro structure without gradient hot phase was proposed, and the acc...

For the combustor based on full-height swept strut coupled with cavity, the experiments were conducted under clean air conditions and the inlet air was preheated by storage heater. Liquid kerosene was used as fuel and was injected by stages from the wall and strut. The effect of equivalence ratio of...

Complex equipment development project characters of high risk and many research units result in risk transmission in the development process. To solve the risk source identification problem, a risk source identification method was proposed based on association rule (AR) and decision making trial and...

In order to improve the safety of low altitude flight for the helicopter with tail rotor, an alternative anti-torque device has been proposed by using the flow control technology of the cross flow fan. Wind tunnel tests show that the device has the characteristics of lateral force. At the same time,...

Signal detection is the key technology for the high precision of laser Doppler velocimetry (LDV) system. In order to achieve the accurate detection of the weak Doppler signal in LDV, we carried out a band-stop filtering toward the Doppler signal on the ground of the statistical characteristics of th...

Faster-than-Nyquist (FTN) signaling is a transmission method with high bit density and inevitable inter-symbol interference. Based on soft output Viterbi algorithm (SOVA), a low complexity receiver for FTN was introduced. The number of comparison in the backtracking process was adjusted by the resul...

The working condition of reinforced concrete (RC) structures in coastal chloride environment combined load effects and environmental effects and there would be a different degree of damage due to load effects in normal conditions. In order to simulated that working condition in laboratory, different...

Aimed at the analysis of comprehensive combat effectiveness for cooperative guidance & control of missile autonomous formation, the conception of cooperative guidance & control level (CGCL) for missile autonomous formation was introduced, an analytical model of comprehensive combat effective...

The stability and controllability characteristics of flying wings are much different from those of conventional airplanes. This difference is prevalent in crosswind take-off and landing. To ensure flight safety in these circumstances, this paper conducts calculation and analysis of trim and response...

A two-phase optimization method for layup design of composite frame for satellite antenna is introduced to improve the structural dynamics performance of the composite frame. Phase Ⅰ focused on generating a new ply layout by optimizing the ply orientation angle and stacking sequences, while the numb...

Paraffin actuators have attracted a great deal of attention in the field of aerospace non-pyrotechnic actuators. The current aerospace paraffin actuator usually employs an elastic squeeze boot to push the actuator rod to move, which causes the disadvantages of large friction force and small force ou...

In applications of computer aided design and reverse engineering, for the data of point clouds without any topology information, we propose an effective smoothing and enhancing algorithm for point clouds based on empirical mode decomposition (EMD). First, the input signal of EMD is computed via the ...

Compared with traditional "rigid" robots, soft robots inspired by biology have been of particular interest to the robotic communities due to their inherent compliance and safety. However, the actuation and control of the soft actuators for such soft robotics are still lacking of theoretical investig...