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- 저자 : Chen Xiaoquan (검색결과 5 건)
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Tensile performances of single-lap countersunk composite joints with metallic bushing
Xiaoquan Cheng,Xiaoyuan Du,Kun Chen,Maosheng Shu,Xiaodong Liu,Gang Chen 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.3
Tensile tests were carried out on the single-lap countersunk composite joints with metallic bushing, and the load-displacement curves, strains and damage morphologies around the bolt hole were measured. A 3D progressive damage finite element model (FEM) was established in ABAQUS/Standard and verified by experimental results. Based on the validated model, tensile performances of the joints were investigated, including damage mechanism analysis of the laminate and the effect discussion of bushing thickness, tightening torque, interference fit size and etc. The results show that metallic bushing can improve ultimate bearing load of the joints. The stress distribution and initial damages caused by assembly around the laminate hole are little affected by bushing thickness. Appropriate tightening torque and interference fit size can improve tensile performances of the joint.
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Chen Xiaoquan,Du Peng,Tian Rui,Li Zhuoyao,Lian Hongkun,Zhuang Kun,Wang Sipeng 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
The space reactor is the primary energy supply for future space vehicles and space stations. The radiator is one of the essential parts of a space reactor. Therefore, the research on radiators can improve the heat dissipation power, reduce the quality of radiators, and make the space reactor smaller. Based on MOOSE multi-physics numerical calculation platform, a simulation program for the combination of heat pipe and fin at the end of heat pipe radiator is developed. It is verified that the calculation result of this program is accurate and the calculation speed is fast. Analyze the heat transfer characteristics of the combination with heat pipe and fin, and obtain its internal temperature field. Based on the calculation results, the influence of structural parameters on the heat dissipation power is analyzed. The results show that when the fin width is 0.25 m, fin thickness is 0.002 m, condensing section length is 0.5425 m and heat pipe radius is 0.014 m, the power-mass ratio is the highest. When the temperature is 700Ke900K, the heat dissipation power increases 41.12% for every 100K increase in the operating temperature. Smaller fin width and thinner fin thickness can improve the power-mass ratio and reduce the radiator quality.
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Design and Implementation of Vibration Isolation System for Mobile Doppler Wind LIDAR
Xiaoquan Song,Chao Chen,Bingyi Liu,Jinbao Xia,Samo Stanič 한국광학회 2013 Current Optics and Photonics Vol.17 No.1
The operation of a Doppler wind LIDAR in a mobile environment is very sensitive to shocks and vibrations, which can cause critical failures such as misalignment of the optical path and damage to optical components. To be able to stabilize the LIDAR and to perform wind field measurements in motion, a shock absorption and vibration isolation system was designed and implemented. The performance of the vehicle-mounted Doppler wind LIDAR was tested in motion, first in a circular test route with a diameter of about 30 m and later in regular expressway traffic. The vibration isolation efficiency of the system was found to be higher than 82% in the main vibration area and shock dynamic deflection was smaller than maximal deflection of the isolator. The stability of the laser locking frequency in the same mobile environment before and after the vibration isolation system installation was also found to be greatly improved. The reliability of the vibration isolation system was confirmed by good results of the analysis of the LIDAR data, in particular the plane position indicator of the line of sight velocity and the wind profile.
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Pengfei Chen,Xiaoquan Dai,Pingxing Xing,Xinyue Zhao,Qingle Zhang,Shifeng Ge,Jianxiao Si,Leihong Zhao,Yiming He 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Novel SnSe/g-C3N4 photocatalysts were one-step synthesized via a microwave heating assisted process in35 min with SnSe and melamine as precursors. The as-synthesized SnSe/g-C3N4 worked very well in H2evolution via photocatalysis. Under simulated sunlight, the best SnSe/g-C3N4 sample displayed a H2-production velocity of 1064 mmol g 1 h 1, which is 1.8 folds faster than that of neat g-C3N4. Similarpromotion effect was also observed under visible light. To reveal the nature behind the highphotoactivity, a thorough investigation was performed. XRD and XPS experiments proved the binaryconstitution of the composite. DRS experiment demonstrated that the addition of SnSe improved thephotoabsorption performance. N2-adsorption analysis showed that the SnSe/g-C3N4 photocatalystpresented similar surface area as g-C3N4. TEM experiments showed that some bulk SnSe werespontaneously decomposed to nanoparticles andfinely dispersed in g-C3N4 during the microwaveheating process. These SnSe nanoparticles were believed to be the active phase and constructed aheterojunction structure with g-C3N4, resulting in the enhanced charge separation. This conclusion wasconsidered as the key factor leading to the high H2-evolution performance and was further confirmed bythe PL, EIS, and PC experiments. The present work provides a feasible and rapid method for theconstruction of g-C3N4 based photocatalysts.
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Nitrate control strategies in an activated sludge wastewater treatment process
Wenhao Shen,Erpan Tao,Xiaoquan Chen,Dawei Liu,류홍빈 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.3
We studied nitrate control strategies in an activated sludge wastewater treatment process (WWTP) basedon the activated sludge model. Two control strategies, back propagation for proportional-integral-derivative (BP-PID)and adaptive-network based fuzzy inference systems (ANFIS), are applied in the WWTP. The simulation results showthat the simple local constant setpoint control has poor control effects on the nitrate concentration control. However,the ANFIS (4*1) controller, which considers not only the local constant setpoint control of the nitrate concentration,but also three important indices in the effluent--ammonia concentration, total suspended sludge concentration and totalnitrogen concentration--demonstrates good control performance. The results also prove that ANFIS (4*1) controllerhas better control performance than that of the controllers PI, BP-PID and ANFIS (2*1), and that the ANFIS (4*1)controller is effective in improving the effluent quality and maintaining the stability of the effluent quality.
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