In order to study the boundary layer transition phenomenon and the flow characteristics of flow around circular cylinder at high Reynolds number, the experimental results and the results that are obtained by using the Transition SST model and the SST k-ω model were firstly analyzed at typical Reynol...

Radiative participant flue gas has important influence on the infrared surface temperature measurement of flue gas covering surface. According to the characteristic of the sample temperature distribution measured by an infrared CCD camera, a simplified one-dimensional model of infrared surface tempe...

The simplified model of transmitter RF circuit was established. Using this model and the nonlinear polynomial model, we studied the relationship of transmitter intermodulation (IM) level between the insertion loss of RF filter, the power and the frequency offset of interference signal. According to ...

In order to study the influence of plasma on the combustion characteristic of multicomponent fuel gas in the ramjet chamber, a multicomponent fuel gas supply system and a diffusion combustion experimental model based on the ramjet, which can exclude the mixing effect of intake air on the fuel gas, a...

In order to study the loading characteristics of different forms of ducted propellers, this paper analyzes the hydrodynamic performance of accelerating duct and decelerating duct and their influences on propellers by using computational fluid dynamics (CFD) method. The computation domain is divided ...

Gas holdup, bubble velocity and bubble chord length in gas-liquid bubble column reactor were measured by using optical probe and conductive probe. It was shown that optical probe has rapid and marked step response to bubbles. When the probe signal data are converted into square wave, the ratio of th...

An MBD model knowledge representation and management method based on ontology technique is proposed to meet the reuse requirement of MBD history model data designed in the product full three-dimensional digitalization development, and retrival test is done considering geometric and non-geometric inf...

With the development of key technologies about more/all electric aircraft, electro-hydrostatic actuator (EHA) is widely applied in aircraft actuation system. Dual-redundancy electro-hydrostatic actuator (DREHA) is easy to realize effortless redundancy design, and improve the reliability of its use i...

To enable the "Jade Rabbit" rover to plan fast in a dynamic work environment on the lunar surface, an activity planning model called temporal planning with dynamic duration and dynamic effect (TP^DD&DE) was developed based on the automated planning technology of artificial intelligence. This mode...

For overset grid, reasonable interpolation between grids is one of the bases to ensure correct calculation of flow fields. In this paper, a new interpolation method for hybrid overset grid is presented, which focuses on the elimination of interpolation error coming from the grids mismatch at the int...

Traditional high-voltage power supply of electron beam welding machine has complicated circuit and huge volume. For improving the property of electron beam welding machine, a novel 60 kV/100 mA high-voltage power supply is developed in this paper. First, the three-phase electric is rectified to 540 ...

According to the requirements of airworthiness standards for lateral-directional static stability of civil aircraft, an assessment method is proposed based on the pilot-aircraft closed-loop mathematical simulation and calculation. Quantitative assessment criteria are set up considering the requireme...

Detailed sizes of threads in the satin weave composite fastener have reached the meso scale. It is not accurate to simulate the real failure mode if the uniform material is applied to the thread in the process of numerical simulation. For this problem, the finite element model of the fastener thread...

A condition-based change and maintenance decision method based on opportunistic policy was proposed for multi-state system with economic correlation and performance correlation among components. Markov model was utilized to characterize the degradation process of components and the universal generat...

Carbon/epoxy (C/E) composites are widely used in manufacture of aircraft structural components because of its excellent properties. It is easy to delaminate and tear when processing C/E composites, and the high cutting temperature is the main cause of defects. As a new hole-machining method, helical...

As the main information channel via that human cognitive environment, visual information plays an extremely important role in the space teleoperation mission. Aimed at the future station robotics teleoperation mission, twenty four subjects were recruited to finish the simulation task, so as to inves...

Against the problem that strong vibration has effect on the performance of hydraulic pipe during the working process of tunnel boring machine, the transverse vibration mathematical model of the clamped-clamped hydraulic pipe under the foundation vibration was built; The methods of Galerkin and equiv...

As computing power increases in recent years, data-driven modeling method receives much attention. Modeling methods to analyze quantitative behavior of systems with single mode have been researched much. However, most systems have multiple modes which own different continuous behavior and are influe...

Quantitative analysis of liquid film temperature, thickness and mass fraction is extremely crucial to the relevant industrial processes, and these parameters are mutually coupled in the study of the mechanism for heat transfer. Temperature, thickness and mass fraction of liquid film, however, can on...

In order to investigate the flame stabilization, combustion state and flame propagation characteristics of scramjet, based on a dual-struts supersonic combustor with staged injections, experiments with continuously adjusted equivalence ratio were conducted. Experiments with combustor inlet Mach numb...

Based on capacitively coupled contactless conductivity detection (C⁴D) technology, a new contactless conductivity sensor with radial structure is designed and developed. Series resonance principle is used to overcome the unfavourable influence of the coupling capacitances by introducing an inductor....

To solve the problems such as high intensity of transmitted light, stray light interference and small scattering angle in the traditional low-angle light scattering techniques, a novel near field scattering (NFS) was adopted to derive the traditional low-angle scattering intensity. A particle size m...

For the installing structure and optimization of electrodes and ultrasonic transducers in the dual-modality electrical resistance tomography (ERT) and ultrasound transmission tomography (UTT), sensors on the same section of pipeline are proposed to measure the same object at the same time. With nume...

In order to study the wake oscillation characteristics of vortex flowmeter, the ensemble empirical mode decomposition (EEMD)-Hilbert spectral method was employed to analyze the wall differential pressure signal of vortex flowmeter using air as the medium, whose volumetric flow rate is in the range 1...

With the development of ultra-low emission reduction in coal-fired power plant, the requirement of monitoring technologies is becoming more and more rigid. A detector probe based on differential optics absorption spectroscopy (DOAS) and multi-wavelength extinction method is presented, which can be u...

For the NP-hard characteristic of job shop scheduling problem (JSP) and big valley property of its solution space, this paper proposes a hybrid algorithm based multiagent genetic algorithm (MAGA) and adaptive simulated annealing algorithm (ASA) to obtain the minimal makespan schedule. First, each ch...