In order to enhance the effect of fluid flow and heat transfer in the porous square cavity, the non-orthogonal multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) is used to simulate the natural convective heat transfer in the porous square cavity with internal heat source. The effects of ...

The rapid maneuver ability is widely required for spacecraft aiming the on-orbit servicing tasks. The integrated orbit, attitude and manipulator control was designed for the space multi-body system, which is composed of the satellite base and manipulator. First, the dynamic model of the multi-body s...

The precursor of Zn-Mn oxides were synthesized by a facile hydrothermal method and subsequently calcined at different temperature of 400℃, 500℃, 600℃ and 700℃ in air in order to synthesis the hierarchical porous ZnMn₂O₄ microspheres assembled by a lot of nanosheets. The ZnMn₂O₄ microspheres synthesi...

To build an effective airport surface visual surveillance system, a moving object speed measurement method based on long-term feature point tracking and analysis is proposed. First, the surveillance camera is calibrated using geographic features on the airport surface. Then, the feature points in mo...

The lack of the prior image data in the space exploration tasks makes it difficult to quantitatively test and evaluate the situation awareness and navigation algorithms based on the optical images. Accordingly, in this paper, we present an algorithm for generating the synthetic space object optical ...

A new solution algorithm for the design of Moon-to-Earth transfer orbit which leaves from the Moon parking orbit with direct atmospheric reentry and single impulse is presented in this paper. The algorithm is divided into two steps, designing the initial solution and searching the exact solution. Fi...

Small actuators are chosen due to the limitation of model aircraft's weight, space and design cost, most of which are lack of frequency response characteristics that need to be tested. Considering the influence of inertial loads and aerodynamic loads of rudder, an platform for testing frequency resp...

To actualize the design requirement of a wire-driven parallel robot applied as the model support in wind tunnel tests, the influence of wire damping on the dynamic characteristics of the wire-driven parallel robot was studied by combining experimental and theoretical modeling methods. Firstly, in or...

Time-varying formation control problems for unmanned aerial vehicles (UAV) swarm with directed interaction topology and communication delay are investigated. The UAV swarm is modeled as second-order discrete-time system on the formation control level and a distributed formation control protocol is d...

Circuit failure is inevitable during operation and fault-tolerant design can significantly reduce the risk of failure. The traditional fault-tolerant method of circuit system is to analyze and improve the system mainly based on the designer's experience and cognition. However, it is usually difficul...

In order to realize the fault magnitude estimation and information reconstruction of aero-engine sensor and actuator in fault condition and to accommodate the influence of fault on engine performance, based on the fault detection and fault isolation algorithms, a reconstruction algorithm based on a ...

An electric dynamic loading system is designed for the load simulation of electro-mechanical actuator used in UAV front wheel steering control system, which can simulate the complex alternating load. In order to overcome the problem of control time delay and extraneous torque in electric dynamic loa...

As an important part of the overlapping grid technology, the implicit grid assembly has no explicit "hole-cutting" process, and it is only necessary to classify cells by comparing their qualities while searching for donor cells. By improving the traditional implicit assembly process, a more efficien...

Similarity is the basic requirements of all kinds of wind tunnel tests including icing wind tunnel tests. To systematically study the similarity problem of icing wind tunnel test, the in-flight icing problem is analyzed and summed up, and then the variables involved are summarized, including both th...

The ballistic missile forms a target group in its mid-flight, and the narrowband radar cannot separate the ballistic target from the distance because of its narrow bandwidth. In order to enable narrowband radar to separate ballistic targets, the micro-motion characteristics of ballistic targets were...

Tactile reproduction technology on touch screens enhances the sense of reality and richness of users' interaction experience. In the process of tactile reproduction, masking effect changes tactile perception characteristics (both absolute threshold and differential threshold), and influences the acc...

In order to solve the problem that the coupling between indexes is not considered an the objective weighting method cannot reflect the true importance of indexes relative to evaluation objects from a logical perspective when calculating the weight of indexes in air combat threat assessment, a maximu...

During the use of mechanical and electrical products, there are degradation failures and shock failures caused by the environment. It is often considered that self-degeneration and impact failure are independent of each other, or there is an incomplete phenomenon of the correlation, that is, the imp...

It is easy to generate burr on the edge of holes when industrial robot drills the aluminum alloy stacked component. The assembly accuracy and efficiency of aircraft are severely affected. Aimed at the problem of robotic low stiffness, a model is developed to compute the burr height of holes produced...

To solve the problem of sensitivity analysis of aviation insecure events under uncertain conditions, this paper proposes the aviation safety index and its sensitivity measurement based on the Bow-tie model. Taking the tire burst accident as an example, we calculate the aviation safety index, the glo...

In this paper, a ranging system of LiDAR based on automatic gain control (AGC) circuit and constant fraction discriminator (CFD) circuit is designed for the problem that pulsed time of flight LiDAR ranging precision is limited by the walking error and time jitter error caused by dynamic range change...

The settings of the sensor array in electromagnetic tomography (EMT) determine the number of induced voltages, which have an important influence on reconstructed image quality. To study the effect of the settings of coils on the quality of reconstructed images, the number and the position of the sen...

Focusing on the flight test difficulty of fuel cell unmanned aerial vehicle (UAV) power system and aimed at improving the design and development level of power system, this paper designs and builds a hardware-in-the-loop (HIL) simulation platform of fuel cell UAV power system, on which the power sys...

In order to solve the problem of lacking the research on the deformation and end contact force of soft robotics, a soft gripper is taken as the research object, and the research on the deformation and end contact force of fiber-reinforced soft gripper is carried out. Firstly, a soft pneumatic grippe...