Aimed at the influence of the soft field effect on the inverse electrical capacitance tomography (ECT) problem and to solve the problems that the traditional iterative algorithm used to reconstruct images has numerous iteration times, and that the imaging speed is slow, for the first time, biconjuga...

Aiming at the unstable heat transfer of mini-channel parallel tubes in boiling heat transfer process, the thermodynamic characteristics of mini-channel parallel tubes during dryout were studied. Firstly, by observing the transition of the flow pattern before and after the dryout in the parallel mini...

In this study, the erosion-corrosion of 304 stainless steel was investigated by liquid-solid two-phase jet impingement experiment, combined with the electrochemical measurement. The influence factors of different impact angles (45°, 60°, 90°), erosion time and fluid properties (with or without chlor...

Under the limiation of ship space, it is the key of ship design to improve the comprehensive performance of propeller. Cavitation is the main noise source of water-jet propulsion pump, so it is an important design parameter of water-jet propulsion pump. In order to reduce the noise of the ship and i...

To broaden the available bandwidth of micro probe transducer system and improve the measurement accuracy of high-frequency pressure signal, it is important to study the frequency response characteristic and analyze the application scope and prediction accuracy of the mathematic models for different ...

In order to investigate the behavior and mechanism of spherical plastic particles attaching to the bubble surface, observations were made in a model system in which spherical plastic particles were dropped onto a stationary air bubble formed in water within a glass cell. Their interaction was record...

Two-phase flow exists widely in industrial field. Accurate measurement of the process parameters, such as flow velocity, is of great significance for quantifying flow rate and optimizing production process and equipment. A combination of one-side two-chip continuous wave ultrasonic Doppler (CWUD) se...

To solve the problem of uneven temperature distribution in the ground simulation experiment of space environment by space optical remote sensor, the modular design is used to optimize the cabin plate structure frock of a certain space optical remote sensor, and the cabin plates are divided according...

The light field Micro-PIV deconvolutes the light field image by Lucy-Richardson (L-R) algorithm to obtain the three-dimensional coordinate information of the tracer particle. The accurate point spread function (PSF) is the premise of the L-R algorithm to complete the reconstruction, and the existing...

Aimed at the flow property in the start-up process of fuel slinger, three-dimensional numerical simulation was used to study the flow property of the inner and outer two-phase flow field of fuel slinger. Combined with the experimental results of high-speed photography and theory, comprehensive analy...

In order to reveal the influence of bubble size and surface hydrophobicity on the flotation process of plastics, high-speed photography was used to observe the collision and adhesion behavior of rising bubbles and plastic plates in pure water medium. According to the change of bubble velocity, it is...

The monitoring of solid particles in the aero-engine gas path and exhaust emissions improves the ability of fault identification and early warning of related equipment. Three different types of electrostatic sensors are used in this study to measure the mass flow of solid particles in square gas-sol...

Aimed at the Faraday wave formed by 35 kHz ultrasonic excitation on thin liquid film, the formation mechanism of Faraday wave was explored by experiments and finite element simulation. The two-phase flow calculation model under ultrasonic excitation was established. The finite element simulation of ...

Ultrasonic vibration assisted machining provides effective manufacturing solutions for difficult-to-machine materials such as alloy materials, brittle materials and composite materials, which is widely used in aerospace, defense, electronics and other high-technology fields. The complex structure, h...

Issues of high cutting force, high cutting temperature and bad machining quality in the case of conventional titanium alloy drilling are widespread. Thus a study of ultrasonic vibration drilling process characteristics of titanium alloy was carried out. Firstly, the characteristics of both interrupt...

A high-speed ultrasonic elliptical vibration milling method is proposed for poor processing quality and low processing efficiency in milling of thin-walled titanium alloy parts in aerospace. Firstly, high-speed ultrasonic elliptic vibration milling combines high-speed ultrasonic vibration cutting co...

To solve the delamination, tearing and fiber losing of carbon fiber reinforced plastic (CFRP) hole induced by large cutting force and torque during conventional drilling (CD), the rotary ultrasonic-assisted drilling (RUAD) technology is introduced. Firstly, based on the analysis of the types and for...

Ultrasonic vibration assisted plastic forming has become an important research direction of plastic forming in recent years. In order to meet the installation requirements of ultrasonic equipments and workpiece, a 10 kN ultrasonic-assisted plastic forming press machine was designed and developed in ...

Aimed at the problem of poor durability of the domestic ultrasonic horn, a new type of compound horn is designed to meet the amplitude and make the horn have a small working stress.The new composite horn parameter equation is established by the wave equation, and the parameters such as magnification...

In order to improve the magnetic circuit environment and minimize the heating of the giant magnetostrictive ultrasonic transducer, the magnetic path gap was taken as the research object, and the relationships between the magnetic path gap and the magnetic field strength of the giant magnetostrictive...

There are two key issues in applying simulated annealing algorithm to solve the problem of ensemble clustering. One is how to use basic partition information in annealing process to obtain better result, and the other is how to accelerate the algorithm convergence. In this paper, the rapid simulated...

Star spots obtained by the star sensor on the imaging plane will be seriously blurred under large angular velocity, which affects the performance of the star sensor. In order to fully understand the star spot motion blur trajectory and quantitatively evaluate the influence of the star spot motion bl...

To improve the accuracy of determining truss geometric stability and the practicability of truss topology optimization results, several ways of determining truss geometric stability were compared, and the validity of three schemes for guaranteeing truss geometric stability of topology optimization r...

Aimed at the problem that there are false targets among targets being tracked, a target recognition model based on risk theory, Bayesian theory and evidence theory is established firstly. Secondly, the situation of target recognition when the target is being tracked is analyzed, and a risk function ...

In order to study the effect of deposition of pollutants on film cooling of gas turbine blades, the experiments were carried out by injecting molten paraffin wax into a small wind tunnel to simulate the pollutants in a real turbine. The blades were approximately replaced by flat plates. The experime...