A5101552523- Magnetic Bearings and Levitation Dynamics
- Tribology and Lubrication Engineering
- Electric Motor Design and Analysis
- Combustion and flame dynamics
- Fluid dynamics and aerodynamics studies
- Computational Fluid Dynamics and Aerodynamics
- Combustion and Detonation Processes
- Magnetic and Electromagnetic Effects
- International Law and Human Rights
- Metal and Thin Film Mechanics
- Spacecraft and Cryogenic Technologies
- European and International Law Studies
- Vibration and Dynamic Analysis
- Inertial Sensor and Navigation
- Composite Structure Analysis and Optimization
- International Law and Aviation
- Acoustic Wave Phenomena Research
Northwestern Polytechnical University
2024
Beihang University
2018-2022
China Aerodynamics Research and Development Center
2022
Ningbo University of Technology
2020-2022
University of Nottingham Ningbo China
2019
Yong In University
1986
The magnetic levitation reaction flywheel (MLRW) is a novel actuator of spacecraft attitude control because its significant advantages, including lack friction and active suppression vibration. However, in vacuum environment, the poor heat dissipation conditions make it more sensitive to various losses rises temperature. Therefore, increasing temperature key issue for components used space. In this study, three kinds heat-generating areas MLRW, namely, passive bearing (PMB), (AMB) brushless...
This paper describes two-dimensional numerical simulations of pulsed injection to a hydrogen-fueled air-breathing ramjet using the Reynolds-averaged Navier–Stokes method. We analyze effects sinusoidal on start-up ignition time, range, combustion efficiency, and flow field evolution compare performance with that steady injection. The results show shortens time optimizes equivalence ratio hydrogen. Pulsed also improves efficiency hydrogen, increasing thrust engine by 7.79% compared under same...
Temperature rise subjected to the copper losses and iron is an important issue for a magnetically suspended turbomolecular pump (MSTMP). In this study, loss estimation, thermal analysis, temperature measurement of large‐scale MSTMP are investigated. The core two radial magnetic bearings, thrust bearing, brushless direct current motor (BLDCM) predicted by analytical models. Based on values, heat generation rates in different parts calculated, then field prototype analysed 3D finite‐element...
Temperature rise caused by losses is an important problem to be solved urgently in spacecraft applications. In order analyze the effect of temperature rise, a magnetically suspended control moment gyroscope (MSCMG) with rated speed 15000 r/min and maximum angular momentum 200 N•m•s analyzed calculated using three-dimensional finite element model (FEM). Then, thermal-structure coupling simulation thermal network analysis are carried out. The positions stress obtained. Moreover, internal heat...
Modal analysis is an important part of magnetic suspended high-speed motor design. In this paper, a rotor-dynamic proposed for turbomolecular pump rotor assembly supported by bearings using the transfer matrix method. First, simplified equivalent model. Then, model established and coefficients are introduced to reflect influence different relations. Next, optimized. Finite element method modal test conducted verify accuracy Finally, stiffness brought into optimized search relationship...
In this paper, an iron loss prediction model of magnetic bearing considering temperature influence is proposed. A ring specimen test under different frequencies, flux densities and temperatures used to measure steel laminations. Then, with variable coefficients for calculation the bearing. Flux part are obtained by using FEM. Finally, accuracy proposed validated on a prototype molecular pump supported
In this paper, an analytical model and optimization including magnetic flux leakage(MFL) for integrated radial/thrust bearing(IRTMB) without thrust disk is proposed. Firstly, method based on equivalent circuit IRTMB structure built. Secondly, the leakage coefficients conducted using sequential quadratic programming method, a set of variables are suggested. Finally, distribution initial optimized compared.
The magnetically suspended control moment gyros (MSCMGs) supported by the magnetic bearings (MBs) have advantages of high accuracy and long life. high-speed disc-shaped rotor (HSDSR) is core component MSCMG. mass, strength stiffness HSDSR directly affect overall performance system. In this paper, multidisciplinary optimization design studied, optimal scheme obtained. weight minimized mechanical improved. It has practical significance in spacecraft attitude