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RISS 인기검색어
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- 저자 : Songjing Li (검색결과 2 건)
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Design and Thermodynamic Research on Microfluidic-Atmospheric Water Generator
Tianhang Yang,Beibei Wang,Songjing Li 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
A portable microfluidic device, composed by an absorbing and heating module, an energy module and a condensing module, was presented for generating fresh water from outdoor air. Based on the working principle of general atmospheric water generator, an attempt mathematic model was designed and established. The functional structure in the condensing module was microfluidic channel, which had compact size and good thermal conductivities. The dynamic characteristics of thermal-fluid coupled fields during phase changing processes (evaporation and condensation) were simulated respectively. COMSOL Multiphysics was used to study the heating-evaporation process and ANSYS ICEM CFD was used to simulate the condensation process. Vary characteristics of fluid field, temperature field and volume fraction distribution while water being generated were observed and then analyzed. Based on the findings of the analysis, a modified device was designed and fabricated. Simplified soft etching process was chosen to manufacture the micro channel in the condensing module. Several test experiments were recorded by thermal infrared imager to detect the temperature distribution during water generating process. The test results agreed well with the former simulation results, both of which would provide significant referential experience for commercial microfluidic-atmospheric water generator design in the future.
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Distributed parameters modeling for the dynamic stiffness of a spring tube in servo valves
Xinbei Lv,Bijan Krishna Saha,You Wu,Songjing Li 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.3
The stability and dynamic performance of a flapper-nozzle servo valve depend on several factors, such as the motion of the armature component and the deformation of the spring tube. As the only connection between the armature component and the fixed end, the spring tube plays a decisive role in the dynamic response of the entire system. Aiming at predicting the vibration characteristics of the servo valves to combine them with the control algorithm, an innovative dynamic stiffness based on a distributed parameter model (DPM) is proposed that can reflect the dynamic deformation of the spring tube and a suitable discrete method is applied according to the working condition of the spring tube. With the motion equation derived by DPM, which includes the impact of inertia, damping, and stiffness force, the mathematical model of the spring tube dynamic stiffness is established. Subsequently, a suitable program for this model is confirmed that guarantees the simulation accuracy while controlling the time consumption. Ultimately, the transient response of the spring tube is also evaluated by a finite element method (FEM). The agreement between the simulation results of the two methods shows that dynamic stiffness based on DPM is suitable for predicting the transient response of the spring tube.
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