For the inverse problem of electromagnetic tomography (EMT), the pathological and ill posed problems of the sensitivity matrix are discussed. A new electromagnetic tomography image reconstruction algorithm is proposed for this situation. Firstly, the principal component analysis (PCA) is used to red...

The research on the flow fluid in the annulus of coaxial rotating conical cylinders originates from the classical Taylor Couette flow in the annulus of two coaxial rotating conical cylinders. This paper uses flow visualization experiments and PIV to display and quantify the internal flow field in th...

Aimed at the problem of unclear description of the conduction relationship of complex equipment risks, a risk conduction uncertain random multi-transfer parameter graph evaluation and review technique (UR-MTPGERT) model is constructed. First, based on the opportunity theory, the moment function of u...

Electro-hydrostatic actuator (EHA), one of the key subsystems in the more electric aircraft, can reduce the size and weight of airborne equipment because of its highly compact design. However, the heat dissipation is weakened simultaneously, which can easily lead to an extremely rapid temperature in...

Two-bed onboard oxygen generation system is facing the problem of large pressure fluctuation of output gas and high oxygen concentration at low altitude during the practical application process. In order to solve these problems, three-bed onboard oxygen generation system needs to be developed. Accor...

As a typical safety critical system, spacecraft is generally a complex system, which could produce a large amount of test data during the comprehensive testing process.When querying these test data, the existing B/S data query technology obtains data from the database server for each query, which gr...

Based on the mean impact value (MIV) which is an impact factor weight analysis method, the weights of fifteen impact factors on corrosion rate of four types of carbon steels (Q235, Ste355, St12, and Q450) were evaluated. The impact factors were corrosion duration, temperature, humidity, sunshine hou...

A method of aeroelastic optimization design with consideration of panel stiffness matching was developed for the composite wing of large aircraft. The optimization was performed based on the sensitivity algorithm, and the objective was to minimize the structural mass subject to the constraints of pa...

The ranging accuracy of time of arrival (TOA) based indoor positioning system is significantly affected by multipath and non-line-of-sight (NLOS) of wireless channel in indoor environment. And these effects result in large measurement error and positioning error. In this paper, the optimization of d...

The cables connecting avionics equipment are important coupling path for electromagnetic interference. When modeling a cable, the terminal common-mode impedance of the cable is a crucial input parameter. Because the quantity of cables in avionics system is very large, it is beneficial for quickly mo...

Through analyzing unmanned combat aerial vechicle (UCAV) advantage probability and task joint threat and defining task time, the task allocation model for UCAVs with multi-constraint dynamic task allocation is built up, which takes target value damage, UCAV attrition and task expending time as the p...

The existing elastomeric damper models commonly introduce dynamic amplitude parameter for applying to wide amplitude situation. It is inconvenient to time domain analysis of helicopter rotor-fuselage coupled dynamic stability on account of the dynamic amplitude changing in time domain. Aimed at this...

The uncertainty of dynamic characteristic parameters of pressure sensors is an important index to characterize its dynamic measurement performance. A method is proposed to evaluate the uncertainty of the sensor's dynamic characteristic parameters. Firstly, a shock tube dynamic calibration system is ...

To allow small data center to work under the office environment to reduce the operating cost, an integrated design of noise reduction and refrigeration is proposed by combining the vapor compression refrigeration system with the server.Based on the verified simulation method of two key component, ax...

In consideration of the low diagnosis accuracy for avionics functional module fault, a new offline localized clustering multi-kernel extreme learning machine (LCMKELM) diagnosis model is proposed in this paper by combining the capabilities of multi-resolution interpretation and local feature self-ad...

In order to investigate the influence of deformation of gas film in gas-dynamic hemispherical bearings on the output of three-floated gyroscopes in the platform initial navigation system subject to 3-DOF specific forces, a mathematical model is established to calculate the static error by solving Re...

The transformable wheel is an effective way to enhance the wheeled mobile robots' obstacle navigation ability in harsh terrain. However, traditional single-structure transformable wheels can only adapt to specific environment and unable to simultaneously satisfy the environments with varieties of ha...

Aimed at the aluminum alloy welding effect on corrosion sensitivity, we have applied loading on the 5A06 aluminum alloy with the welds in different directions (vertical, cross) and studied the effects of stress loading on the corrosion behavior of the alloy in 3.5%NaCl solution at 50℃ and the electr...

The atomic magnetometer and Raman cooling need to lock the frequency of the laser on the detuning of several gigahertz away from the resonance. The laser frequency stabilization technique in Faraday rotation spectroscopy can stabilize the laser frequency on the large detuning away from the resonance...

A symmetric non-equally spaced protocol named adjustable-parameter dynamical decoupling (APDD) was proposed to individually map ¹³C nuclear spin in diamond. The principles of the APDD sequence are in detail numerically calculated and simulation analyzed. The ¹³C nuclear spin addressing accuracy of A...

In order to verify the effectiveness of the formation control algorithms of UAV swarm in the actual environment, a distributed UAV swarm formation control demonstration and verification system consisting of UAV platform, two sets of ground station and data link was built under outdoor conditions. Th...

Acceleration overlord during short-distance takeoff might affect the operation performance of pilot. To avoid potential risks, a pilot-cockpit multi-rigid-body model was established to simulate the man-machine dynamic response under chest-to-back (Gx) acceleration loads. Firstly, using 3D CAD softwa...

Based on the structural design of the Lorentz force magnetic bearing (LFMB), a kind of torquer's non-circular error compensation method is put forward to enhance the sensitivity accuracy of magnetically suspended control sensitive gyroscope (MSCSG) to gyro carrier attitude. First, for a new type MSC...

To solve the problem of 3D reconstruction in textureless environment like railway, the confidence coefficient is proposed to combine TOF and stereo vision system effectively. Through the joint calibration, the coordinate relationship between TOF and stereo vision systems is established. Then by proj...

Solid-gelled propellant gas generator is a new and special gas generator, and is the core component of the variable-depth missile ejection system. In order to study the temperature distribution of storage space of solid-gelled propellant gas generator, the source term method, the dynamic mesh method...

Lightweight materials such as high-strength steel, aluminum alloy or magnesium alloy applied as substitutions of plain steel to manufacture of bearing structures on vehicle have been an obvious tendency. Using industrial aluminum alloy as material, a new light bus frame was designed in this paper, a...