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Junlei Sun,Heping Wang,Zhou Zhou,Shan Lei 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.3
Aerodynamic numerical simulation of low Reynolds number long-endurance Diamond Joined-Wing configuration unmanned aerial vehicle was performed. First, low Reynolds number aerodynamic characteristics of a typical wing are numerically simulated by solving the Reynolds averaged Navier–Stokes (RANS) equations based on the structural grid technology and the k–kL–ω transition model. To prove the accuracy of this method, experimental data and numerical simulation results were compared. Second, the performance of low Reynolds number Diamond Joined-Wing configuration UAV (unmanned aerial vehicle) aerodynamic characteristics and control surfaces was studied by numerical simulation and theoretical analysis. The analysis of the interference between the Frt-wing (front wing) and the Aft-wing (after wing) of the Diamond Joined-Wing configuration UAV and the reason for the change in the pitching moment in the lateral-directional motion is carried out. The results show that the Diamond Joined-Wing configuration UAV has a typical low Reynolds number surface flow characteristics, Frt-wing and Aft-wing flow interference are relatively minor at a small angle of attack, which has a high basic aerodynamic performance in addition to good stall characteristics, with longitudinal and lateral-directional static stability. The performance of control surfaces and flaps is higher to meet the design requirements. Finally, the accuracy of the numerical simulation results was verified by vehicle aerodynamic testing.
Deformation Behavior of the Mg–Zn–Ca–Ce Alloy Sheets Subjected to Uniaxial and Biaxial Tensile Tests
Guangang Wang,Guangsheng Huang,Ke Liu,Junlei Zhang,Bin Jiang,Aitao Tang,Fusheng Pan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
The uniaxial tensile test and Erichsen test are performed on the different deformation behavior under different stress states. The materials used in this paper had obvious anisotropy in the rolling plane because of the bimodal textures along the transversedirection. However, the Mg alloy with the weakest texture distribution did not get the better plasticity and formability,which was related to the enhanced grain boundary cohesion by more Zn addition. The rate of dislocations storage was independentof load direction for a given Mg alloy, even if Mg alloy has large in-plane anisotropy at lower stress levels. Therewas something different from the work hardening behavior in stage III between the ZXE0500 alloy and ZXE1500 alloy inthree load directions because of the dynamic recovery. Tension twin is easier to be activated on ZXE1500 alloy rather thanZXE0500 alloy. Because the crack edge of samples used for the Erichsen test went through non-equal biaxial tensile stress,and the strain in the radial direction was much larger than that of the circumferential direction, so the texture evolution wassimilar to the uniaxial tensile stress.
An Amplitude-Adaption High-Frequency Signal Injection Method for SynRMs at Zero-Low Speed
Chen Junlei,Chen Qiushuo,Fan Ying,Wang Yueqi 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
In this article, an amplitude-adaption high-frequency signal injection (A-HFSI) method is proposed for synchronous reluctance motor (SynRM) sensorless control at zero-low speed to reduce the position estimation error and high-frequency (HF) current magnitude at load condition. Firstly, the conventional high-frequency signal injection (HFSI) scheme is presented. Following this, the infl uences of cross-saturation inductance on position estimation and the nonlinear characteristics on the high-frequency induced current are examined. Subsequently, an A-HFSI method is introduced, utilizing an enhanced position observation and amplitude-adaptation approach. This method eff ectively eradicates estimation errors and maintains a consistent HF current magnitude across varying load conditions. Experimental validation of the A-HFSI method is conducted on a 1.5-kW SynRM test bench.
Hu, Qingliu,Chang, Junlei,Tao, Litao,Yan, Guoliang,Xie, Mingchao,Wang, Zhao Korean Society for Biochemistry and Molecular Biol 2005 Journal of biochemistry and molecular biology Vol.38 No.6
Apoptosis and necrosis are distinguished by modality primarily. Here we show an apoptosis occurred instantly, induced by $300\;{\mu}M$ W-7 ((N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide hydrochloride), inhibitor of calmodulin), which demonstrated necrotic modality. As early as 30 min after W-7 addition, apoptotic (sub-diploid) peak could be detected by fluorescence-activated cell sorter (FACS), “DNA ladders” began to emerge also at this time point, activity of caspase-3 elevated obviously within this period. Absence of mitochondrial membrane potential (MMP) reduction and cytochrome c, AIF (apoptosis inducing factor) release, verified that this rapid apoptosis did not proceed through mitochondria pathway. Activation of caspase-12 and changes of other endoplasmic reticulum (ER) located proteins ascertained that ER pathway mediated this necrosis-like apoptosis. Our findings suggest that it is not credible to judge apoptosis by modality. Elucidation of ER pathway is helpful to comprehend the pathology of diseases associated with ER stress, and may offer a new approach to the therapy of cancer and neurodegenerative diseases.
System Control Methods for Energy Efficiency Improvement of Parallel Pump Systems: A Review
Chenchen Hua,Maosen Xu,Jiegang Mou,Junlei Wang,Peijian Zhou,Xuelong Yang 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.4
With the consistent pursuit of global countries for the goal of carbon neutrality, the urgency of energy saving and emission reduction is self-evident. Considering the critical proportion of pump consumption in the total energy consumption, improving its energy efficiency is significant to energy saving and emission reduction. Recently, many researches have aimed to improve parallel pump systems' energy efficiency. Due to the inflexibility of the existing parallel pump systems structure and the difficulty of equipment modification, the research methods mainly focus on improving the system control methods to enhance the system performance further. This paper introduces the latest research progress in modeling and control methods for parallel pump systems, firstly analyzing the energy consumption of existing parallel pump systems and proposing the possibility of energy saving in parallel pump systems. Then the system modeling and control methods are discussed in detail, comparing the traditional control methods with the emerging control optimization methods and discussing the parallel pump systems structure and monitoring. This review is expected to provide insights for future research on improving the performance of parallel pump systems.