To study the electromagnetic scattering characteristics of a V-shaped deformation quadrotor, calculation approach is presented to determine dynamic radar cross section (RCS). The rotation single/multi-rotor, opening support arm and fuselage are dynamically simulated. Physical optics physical theory diffraction used calculate target RCS. results show that when undeformed, presence strong sources such as arms, rotor towers, hubs allows for an instantaneous peak 13.08 dBm 2 under given forward...

The study of the development cost general aviation aircraft is limited by small samples with many cost-driven factors. This paper investigates a parametric modeling method for prediction aircraft. proposed technique depends on some principal components, acquired utilizing P value analysis and gray correlation analysis. According to these corresponding linear regression BP neural network models are established respectively. feasibility accuracy verified comparing results model fitting...

The major objective of this paper is to build a cost prediction model for general aviation aircraft using artificial neural network (ANN) and principle component analysis (PCA) methods. A total number 22 samples collected from the literature are utilized train test model. In PCA, eigenvalues PC1 PC2 6.987 1.529, respectively, indicating that they have strongest interpretation original variable information retained as influencing variables ANN pure multiple linear regression (MLR), stepwise...

The wing aerodynamic shape optimization is a typical high-dimensional problem with numerous independent design variables. Researching methods to reduce the dimensionality of from perspective characteristics necessary. One traditional aerodynamic-based approach decouples wing’s camber and thickness according thin airfoil theory, but it has limitations due unclear application scope effectiveness. This paper proposes an improved that determines values certain variables based on data-driven...

A reasonable penetration route planning method is the key technology which can help UAV to enhance successful probability of mission. The existing not describe detecting characteristic radar and network exactly. According these limitations, this paper proposed a new for by improving APF (Artificial Potential Field) robot path planning. As took both characteristics anti-stealth principle into account, thread environment model built up got from are more reasonable. two examples in also show...

Obtaining accurate development cost estimation results of general aviation aircraft is crucial for companies to adopt the best strategy in process. To address this problem, paper proposes a combination three commonly used single prediction methods. The optimal weight values methods are determined by utilizing shortest ideal point method. Ten datasets collected from literature utilized fitting and testing combined method, coefficients individual calculated as 0.6859, 0.0035 0.3106,...

Unmanned aerial helicopters (UAHs) have been widely used recently for reconnaissance operations and other risky missions. Meanwhile, the threats to UAHs becoming more serious, mainly from radar flights. It is essential a UAH select safe flight path, as well proper flying attitudes, evade detection operations, stealth abilities of can be helpful this. In this paper, stealth–distance dynamic weight Deep Q-Network (SDDW-DQN) algorithm proposed path planning in UAH. Additionally, applied reward...

Purpose The purpose of this paper is to develop a flexible design-oriented development cost method for commercial aviation aircraft based on small sample and poor information. Design/methodology/approach To predict the accurately, methodology collected data actual technical, then prediction relationships derived from an exhaustive statistical filtered regression analysis are incorporated. A series equations with high coefficient yielded after driving factors fixed. Next, several sets...

With the development of aviation military and civilian aircraft, oxygen supply equipment also has higher technical improvements system innovations. In order to simulate work accurately test volume flow under high altitude condition, detection method damping is adopted detect equipment. The gas density correction not needed during testing process. range setting, damper tube structure other aspects are described, principle, identification/calibration methods were studied verified been applied for new

Purpose General aviation aircraft has a wide range of applications, and effective cost management is one the hot spots in research general manufacturers. The purpose this paper to build flexible engineering method predict maintenance aircraft. Design/methodology/approach To establish reasonable prediction model, it necessary analyze influencing factors extract main components cost. divided by method, estimation model each component established. Then, obtained. results show that relative...