In order to improve the accuracy for ultrasonic characterization of the uniformity of SiCp/Al composites, the imaging methods based on ultrasonic attenuation and velocity for the distribution uniformity of SiCp particles were studied. SiCp/Al specimens with different volume fractions of SiCp were pr...

Because the conventional vacuum booster brake systems cannot be applied to electric vehicles directly, an integrated electro-hydraulic brake (IEHB) system, which consists of a hollow brushless DC motor, a ball screw assembly, a 3-chamber master cylinder, a pedal cylinder and a pedal stroke simulator...

In the frame of isogeometric analysis (IGA), non-uniform rational B-spline (NURBS) serves as both the description of geometries in computer aided design (CAD) and the shape function in finite element analysis (FEA). The common problems of gap and overlapping in NURBS models increase the difficulty o...

Face gear transmission has outstanding advantages, and has broad application prospects in the field of aviation. In order to improve the machining efficiency of face gear, the spherical gear hob and hobbing of face gear based on spherical gear hob were studied. The forming process of gear shaping wa...

To enhance the anti-jamming capability of cyberspace data-link (CDL) in the complex electromagnetic environment, we explore the problem of the image interference caused by IQ channel imbalance in simultaneous transmit and receive based cognitive anti-jamming (SCAJ) system. The interference sensing o...

The transonic aileron efficiency is a hotspot and difficulty in the field of static aeroelastic analysis. The computational fluid dynamics (CFD)/computational structural dynamics (CSD) interaction method can supply high-accuracy resolutions, but it still has problems of mesh deformation robustness a...

The wind turbine systems with trailing-edge flaps have broad prospects in application of large-scale wind turbine system. In the smart wind turbines with variable trailing-edge flaps, the aerodynamic characteristics of the blades can be regulated by using the trailing-edge flaps, and then the purpos...

Two-switch cascade converter is the most appropriate solution for efficient high-power applications among the existing converter topologies. However, the cascade structure and the nonlinear dc gain of Boost circuit are more likely to cause severe oscillations if the criterion for the selection of th...

Aimed at solving the problem of big error between the measured data and the calculated results of traditional adjacent interference model, the model of signal-to-noise ratio and the model of nonlinear response at receiver radio frequency front end are combined. Considering the noise generated by fre...

The end effector's position & attitude trajectory planning of a free-floating space robot (FFSR) with constant zero-disturbance to the base attitude was investigated. For a kinematically non-redundant three-degree-of-freedom FFSR, a state transformation between the position & attitude of the...

For the problem of bearing-only maneuvering target tracking under the unknown-but-bounded noises, this paper proposes an ellipsoidal outer-bounding set-membership estimation (EOB-SME) algorithm. The EOB-SME algorithm has a prediction-correction structure in time update and observation update, which ...

This paper is concerned with the cooperative control problem of multiple flight vehicles, and an event-based control policy is investigated. The multiple flight vehicle system is modeled involving directed graph and relative position in the formation. By designing a general trigger function, the sta...

Aimed at the problem of multiple maneuvering targets tracking in low signal-to-clutter ratio backgrounds, a central difference Kalman cardinalized probability hypothesis density filter based on maximum likelihood (ML) background parameter estimation (BE-CDKF-CPHD) is proposed. The ML method is used ...

The problem of fault detection and fault tolerant control in finite frequency domain for networked control system with random time delay is investigated in this article. Considering the fault in finite frequency domain, the fault detection filter with prescribed performance is proposed. In order to ...

This paper focuses on the cue ball controlling problem for a billiard robot. A neural network (NN) controller is designed, and the trained robot is able to stroke the cue ball moving to the target point after colliding with objective ball and cushions. Since the problem is non-linear and non-smooth,...

Composite cylindrical shells are already commonly used in structural engineering, and their buckling is of vital importance in the design of such structures. The linear eigenvalue problem can be used as an initial analysis method due to the huge discrepancies observed between test results and theore...

In the environment of stratosphere, the quasi-stationary characteristics of high altitude platform station (HAPS) seriously affect handover performance of the communication system. In the scenes of platform disturbance and mobility of terminal, the handover algorithm based on fixed thresholds is eas...

With universal deflection, the high-speed rotor of new magnetically suspended control & sensitive gyroscope (MSCSG) can output high-accuracy and high-bandwidth deflection control torque, which can inhibit periodic vibration of the space-based platform. MSCSG is fully actively controlled in 5 deg...

Due to the large consumption and poor repeatability of global navigation satellite system-reflection (GNSS-R) airborne experiment, it is needed to develop GNSS-R signal simulator. But there is no corresponding signal model. In this paper, a modeling method for airborne GNSS ocean reflection signal, ...

For multi-tone interference in orthogonal frequency division multiplexing (OFDM) system, one scheme is proposed, which first increases frequency domain resolution of multi-tone interference identification, and then performs parameter estimation, reconstruction and elimination on several single-tone ...

In complex electromagnetic and natural environment, the reliability of unmanned aerial vehicle (UAV) data link is under serious threat. To solve the problem of channel selection and power control to ensure UAV communication quality, a new channel selection and power control method in combination wit...

On account of the unmanned aerial vehicle (UAV) reconnaissance images under the hazy weather conditions, considering the characteristics of UAV itself, this paper proposes a novel method for dehazing UAV reconnaissance images based on image enhancement. Through automatic white balance and contrast e...

The renewal model of one-unit repairable system with three states (up, minor repair, repair) is put forward on the basis of the renewal model with three states (up, delay-repair, repair). The steady availability is improved in the new model. The renewal equation in the model is transformed into the ...

The performance of a double-faced gas film seal system used in counter-rotating intershafts was analyzed. The system's two-degree-of-freedom force balance equation was established. The thickness and force of the film were calculated with finite element method. The seal system's dynamic response to s...

From geometric air combat to energy air combat, till angle air combat theory, the process of air combat is analyzed more from the fighter performance point of view, the effect of the operational pilot in decision-making is neglected. This paper analyzes the variation characteristics of observation d...

Sample allocation method of stratified sampling based on failure rate that is widely utilized in testability verification test considers only one single factor, which may lead to inaccurate assessment. Sample allocation method based on multiple factors is difficult to be used in engineering due to i...

The trajectory deviation analysis of relative motion in closed-loop control system was conducted with the concept of relative reachable domain (RRD), which is a geometric description for the collection of all the possible relative positions. Given that the state error of spacecraft is subjected to a...