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Zhongmin Liu,Liangzhu Cheng,Xin Zhai 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
We studied the transient driving power of an oil pump for 1.6 L PFI engine in a passenger car under the new European driving cycle (NEDC) and worldwide harmonized lightduty test cycle (WLTC), and analyze the influence of control strategies on the energy-saving potential of the oil pump. To measure the dynamic matching conditions between the oil pump supplements and the engine lubrication requirements, a test system of the engine lubrication performance in passenger cars was built using the hardware-in-the loop (HiL) method. Subsequently, a set of acceleration and deceleration test cycles was designed to represent the harsh lubrication conditions in the standard driving cycles, so as to facilitate analysis of the reasons for driving energy loss of oil pump under transient conditions. Further, three kinds of control strategies of oil pumps used in engine design were analyzed and a comparison was given on their effects on the driving energy consumption and lubrication safety under NEDC and WLTC. The test results indicate that the hydraulic energy losses caused by the pressure relief valve opening and lubricant flow hysteresis were the main reasons for the driving energy increments in the oil pump under transient conditions. In addition, the variable lubrication flow control strategies were effective in reducing the pressure relief valve opening duration and hydraulic energy losses, yet had minimal influence on the hydraulic energy losses caused by lubricant flow hysteresis. Compared with the constant one, 2-stage variable control strategy reduced the overall driving energy by 42.7 % and 46 % in NEDC and WLTC, respectively, while the corresponding hydraulic energy output fulfilled the requirements of engine lubrication. By the 2-stage oil pump, the total fuel consumption of vehicle in WLTC was reduced by 1.93 % and 0.94 % at 25 °C and 100 °C, respectively.
Temperature dependent luminescence of Dy3þ doped BaYF5 nanoparticles for optical thermometry
Zhongmin Cao,Shaoshuai Zhou,Guicheng Jiang,Yonghu Chen,Changkui Duan,Min Yin 한국물리학회 2014 Current Applied Physics Vol.14 No.8
Dy3þ doped BaYF5 nanoparticles with tetragonal structure were synthesized by hydrothermal method and solvothermal method. The structural and the luminescent properties of the samples were characterized by X-ray diffraction pattern, TEM and photoluminescence spectra. Emission of Dy3þ originated from 4I15/2 located at 450 nm and 4F9/2 located at 478 nm, 573 nm and 660 nm were observed under excitation of 355 nm laser. Behavior of fluorescence intensity ratio with temperature increasing from room temperature to approximately 800 K was investigated. And the optimum temperature range for thermometry is obtained to be 550e800 K according to its sensitivity-temperature relation, indicating the potential application of BaYF5:Dy3þ as a luminescent temperature sensor.
A Self-adaptive Time Slot Allocation Algorithm Based Low Value of SINR in TD-LTE System
Yao Zhongmin,Lu Yanyang,Liu Wei,Si Hongyan 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.6
In time division duplex Long Term Evolution (TD-LTE) system, the protocol provides 7 different time slot configurations. Only one fixed time slot deployed in mobile network. This paper proposed a dynamic time slot allocation algorithm, the system according to the user equipment (UE) detected the environmental signal to interference and noise ratio (SINR) to dynamically decide the time slot configuration, especially the UE in the situation of relatively bad wireless environment and the lower SINR value, can adopt the polling algorithm, obtained the dynamic time slot configuration. This method is simple in calculation, can reduce redundant computational burden in the system. The result of simulation demonstrated that the algorithm has significant effect in improving the networking throughput、 increasing the system spectrum utilization rate.
An efficient high-order warping theory for laminated plates
Deng, Zhongmin,Huang, Chuanyue Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.5
The theory with hierarchical warping functions had been used to analyze composite thin-walled structure, laminated beam and had good results. In the present paper, a series of hierarchical warping functions are developed to analyze the cylindrical bending problems of composite lamina. These warping functions which refine through-the-thickness variation of displacements were composed of basic and corrective functions by taking into account of anisotropic, material discontinues, and transverse shear and normal strain. Then the hierarchical finite element method was used to form a numerical algorithm. The distribution of the displacements, in-plane stresses, transverse shear stresses and transverse normal stress for composite laminate were analyzed with the present model. The results show that the present model has precise mechanical response compared with the first deformation transverse theory and the corrective order affects the accuracy of result.
Yanan Li,Zhongmin Liu,Yaru Li,Yongchuan Wu,Jitao Chen,Yanjun Liu,Ping Na 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.5
The Bi2S3-TiO2-RGO composites were synthesized by a facile one-step hydrothermal method and applied for the photocatalytic degradation of Rhodamine B (Rh B) under the visible light. The Bi2S3-TiO2-RGO composites were characterized by transmission electron microscopy, X-ray diffraction, Raman and Fourier transform infrared spectrometer. The results indicated that the Bi2S3-TiO2-RGO composites were successfully prepared, and Ti-O-C and S-C bonds were existing among Bi2S3, TiO2 as well as RGO. Furthermore, the photocatalytic ability of Bi2S3-TiO2-RGO composites was excellent under visible light due to its responding to the whole visible light region, low recombination rate of photogenerated electron–hole pairs and relatively negative conduction band. Rh B photocatalytic degradation rate was 99.5% after 50 min and still could reach 98.4% after five cycles. Finally, a formation mechanism as well as a photocatalytic mechanism of Bi2S3-TiO2-RGO composites were proposed based on the experimental results.
3-D Deformation Behavior Simulation of Cable Stitch Based on Particle System in Weft Knitted Fabrics
Sha Sha,Lei Luo,Zhongmin Deng,Dapeng Yuan,Bin Li,Xuewei Jiang,Hui Tao,Qufu Wei 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
The static simulation of weft knitting can be efficiently realized by graphics simulation techniques, but there still remains a challenge for mechanical models. The lack of practical mechanical models significantly limit the realistic deformation behaviors of complex cable stitches, which lead to a great different between the simulation effect and the actual fabric. In order to obtain the deformation behavior and volumetric performance of cable stitch, loop models were built based on an improved particle system in this work. Compared with plain weft knitted, the offset value of bonding points of cable stitches were measured. By analyzing the relationship between the deformation of loops and the displacement of the particles, the deformation behavior of cable stitch was simulated. Velocity-Verlet integration was introduced to simulate cable stitches and the stable results were obtained. The results show that these models and algorithm displayed the accurate deformation behavior of cable stitches, as demonstrated by qualitative comparisons to measure the deformations of actual samples.