A5100404133- Combustion and Detonation Processes
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Piezoelectric Actuators and Control
- Risk and Safety Analysis
- Space Satellite Systems and Control
- Iterative Learning Control Systems
- Adaptive optics and wavefront sensing
- Industrial Technology and Control Systems
- Optical Systems and Laser Technology
- Energetic Materials and Combustion
- Advanced Sensor and Control Systems
- Advanced Algorithms and Applications
- Advanced MEMS and NEMS Technologies
- Adaptive Control of Nonlinear Systems
- Inertial Sensor and Navigation
- Magnetic Bearings and Levitation Dynamics
- Environmental Changes in China
- Aeroelasticity and Vibration Control
- Advanced Measurement and Metrology Techniques
- Force Microscopy Techniques and Applications
- Remote Sensing and Land Use
- Atomic and Subatomic Physics Research
- Robotic Mechanisms and Dynamics
- Evolutionary Game Theory and Cooperation
Northwestern Polytechnical University
2011-2024
Tsinghua University
2024
Conference Board
2021
China Electric Power Research Institute
2017
North China Electric Power University
2017
China Jiliang University
2017
Shenyang University of Technology
2016
Duke University
2014
Hebei University of Technology
2009
Nanyang Technological University
2006
Cluster unmanned aerial vehicles (UAVs) are widely demanded. To achieve high rate and large capacity communication with cluster UAVs, one of the key but still challenge task is to perform multitarget acquisition, pointing, tracking (APT) under complex airborne environment. solve this problem, paper gives composite axis APT system for laser UAVs. The consists a gimbal mirror piezoelectric fast steering mirrors (FSMs), which can independent synchronous control multiple optical axes. cascade...
Accurate modeling and identification of piezoelectric actuators are increasingly demanded for intelligent micro-nano manufacturing to improve the accuracy positioning scanning. In this article, one coupled fractional-order creep hysteresis model is established using only five parameters. Then, properties investigated under sinusoidal step inputs. The approaches thus proposed by leveraging special characteristics model. Simulation experimental studies carried out validate effectiveness...
HgCdTe avalanche photodiodes (APDs) exhibit unique gain stability, making them advantageous for weak signal detection. However, research on neutral impurities (NIs) scattering in remains limited, and the non-parabolic electron dynamics pose significant error current device scale models. These limitations hinder theoretical industrial development of APD. Here, we designed Si-substrate devices CdZnTe-substrate with high low NI density, respectively, to clarify role NIs. Combining...
This article proposes an XYZ flexure parallel mechanism (FPM) with large displacement and decoupled kinematic structure. The motion range of the large-displacement FPM using notch hinges is more than 1mm achieved by assembling typical prismatic joints a new joint proposed in this article. Moreover, stage has small cross-axis error parasitic rotation. An exact nonlinear modeling method for type presented. Using method, stiffness dynamics are studied. Comparison between pseudo-rigid-body...
A synchronous control of relative attitude and position is required in separated ultra-quiet spacecraft, such as drag-free, disturbance-free, distributed spacecraft. Thus, a twistor-based sliding mode investigated this paper to solve the problem among spacecraft modules. The design stability proof are implemented using Modified Rodrigues Parameter (MRP). To evaluate effectiveness proposed method, presents case study flying considering mass uncertainty external disturbances. In addition,...
Large aperture space technology is critical for next-step astrophysics missions with high resolution requirement. The distributed telescope has been proven as an appealing solution to break the technical limitation in obtaining large apertures. However, stringent interference imaging condition puts forward extremely control accuracy requirement on which still a challenge task and need be further studied. This paper thus presents one payload formation by synthesizing non-contact...
The parallel permanent magnetic suspension system using flux-path control is composed of a servo motor, radially magnetized disk magnet, and pair magnetizers. Establishing an accurate mathematical model difficult owing to the system's special structure nonlinear characteristics. To ac quire model, autoregressive exogenous (ARX) identification method applied system. First, input output data are acquired from experiment. Then, ARX established utilizing method. Lastly, relevant simulations...
The mixture fraction/probability density function (PDF) model and eddy break up (EBU) were used to simulate the combustion in a 200MW foursquare tangential circle boiler, calculating flue gas velocity field, temperature field product concentration distribution furnace. calculated results showed that: filed of PDF is consistent with EBU model, but obtained by slightly larger than model.
In order to shorten the deflagration-to-detonation transition (DDT) distance of pulse detonation combustion chamber, an experimental study effect pneumatic atomization injector modification on particle size amd gas-liquid two-phase U-bend (U-PDC) chamber was carried out. Gasoline and air were used as fuel oxidizer, tested characteristics U-PDC obtained using before after modification. The results show that range modifica?tion is 111.6~152.9 ?m, 76.4~107.2 than significantly reduced. can...
Quasi-steady state and transient performance analyses of a pulse detonation turbine engine (PDTE) are conducted based on an unsteady finite-time model. In quasi-steady analysis, the compressor operation status over cycle time is studied. The thrust, specific fuel consumption, thermal efficiency compared under four different frequencies. power extraction method introduced to design control strategy for analysis. Last, effect flight conditions PDTE acceleration investigated. results show that...
Abstract To reduce the fuel consumption rate of pulse detonation combustor (PDC), an experimental study was carried out to influence injector aperture on atomization particle size pneumatic and its combustion characteristics PDC. The test used gasoline\air as oxidant, tested obtained research results show that under three apertures decreases with increase mixed air volume increases flow rate. effect is better when 1.4 mm, range 71.8–119.8 μm. PDC using different injectors can achieve stable...