Editor in chief：朱立光
International standard number：ISSN 1008-1542
Unified domestic issue：CN 13-1225/TS
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2017, 38(1):1-6. DOI: 10.7535/hbkd.2017yx01001
Abstract:During the high-power laser welding process, plasmas are induced by the evaporation of metal under laser radiation, which can affect the coupling of laser energy and the workpiece, and ultimately impact on the reliability of laser welding quality and process directly. The research of laser-induced plasma is a focus in high-power deep penetration welding field, which provides a promising research area for realizing the automation of welding process quality inspection. In recent years, the research of laser welding process dynamic monitoring technology based on plasma characteristics is mainly in two aspects, namely the research of plasma signal detection and the research of laser welding process modeling. The laser-induced plasma in the laser welding is introduced, and the related research of laser welding process dynamic monitoring technology based on plasma characteristics at home and abroad is analyzed. The current problems in the field are summarized, and the future development trend is put forward.
2017, 38(1):7-12. DOI: 10.7535/hbkd.2017yx01002
Abstract:In order to solve the problem of narrow groove wall fusion, improving the weld formation, the welding test of different oscillation width and frequency is carried out by adopting the narrow high-speed swing MAG welding torch. On the basis of measuring the macro metallographic to determine the weld cross section size, the curve fitting of the variation trend of the weld section size with the swing width and the swing frequency is carried out. The effect of the high speed swing arc narrow groove welding MAG parameters on weld formation is studied. The results show that increasing the swing width or frequency can reduce the weld penetration and increase lateral wall penetration; when the swinging width makes side spacing greater than -0.5 mm and less than 1 mm, good weld forming will be gained; when the oscillation frequency increases to more than 5 Hz, weld finger penetration can be eliminated, but when it is above 9 Hz, increasing the swing frequency cannot cause obvious change of the dimension of weld. The effects of these oscillating parameters on weld formation can provide guidance for the selection of welding parameters.
2017, 38(1):13-18. DOI: 10.7535/hbkd.2017yx01003
Abstract:In order to verify the accuracy and reliability of the function and control strategy of the pneumatic electronic parking brake(EPB) system, a test platform of the pneumatic EPB system is designed. The working principle of the air pressure type EPB test platform is introduced, the composition of the platform is confirmed, including air press storage module, braking module, man-machine interaction module, signal imitation module, data collection module, and fault diagnosis module, and the function of rapid charging and discharging of the pneumatic EPB system is carried out. The results show that, compared with manual control valve, the air pressure EPB braking process is more sensitive, and the test platform can meet the test requirements of the pneumatic electronic brake system.
2017, 38(1):19-25. DOI: 10.7535/hbkd.2016yx06006
Abstract:In order to improve the efficiency of urban logistics distribution center location selection, and to overcome the shortcomings of the traditional method based on human aided calculation, the online map is used to obtain the path distance information. Considering the practical construction and operation situation of the logistics distribution center, the cost related impact factors are determined and the location optimization frame is described. Then the mathematical formulation is proposed for minimizing the total cost, and the genetic algorithm based on integer code is designed to solve the problem under consideration. The corresponding system is implemented by C# language. The system is tested based on the practical data, and the computational results demonstrate that the proposed system can automatically obtain the distance information between various nodes and perform the location optimization. Finally the optimal feasible location scheme is delivered by the proposed system.
2017, 38(1):26-31. DOI: 10.7535/hbkd.2017yx01005
Abstract:Optical waveguide devices are widely used in many fields and have good development prospects. But surface roughness of waveguide device induces a passive effect on the light transmission loss and the Q value of ring cavity, which restricts the development and applications of optical waveguide devices. Currently, the common used surface and side wall smoothing methods for waveguide devices are the thermal oxidation method, laser beam method, and hydrogen annealing method, and the surface hydrogen annealing method has better smoothing effect. However, the mechanism of hydrogen annealing method is still not clear so far, thus the experimental parameters cannot be further optimized to obtain optimal experimental result. Based on the review of the contents mentioned above, the hydrogen annealing mechanism is primarily studied through the simulation analysis by Materials Studio, which provides theoretical foundation and guidance for smoothing of waveguide device by hydrogen annealing technology.
2017, 38(1):32-38. DOI: 10.7535/hbkd.2017yx01006
Abstract:To establish a method for the related substance determination of formononetin, HPLC is performed on the column of Agilent HC-C18 （250 mm × 4.6 mm，5 μm） with the mobile phase A of acetonitrile and mobile phase B of potassium dihydrogen phosphate solution at the flow rate of 0.8 mL/min. According to gradient elute, the sample size is 10 μL, the detection wavelength is 250 nm, and the column temperature is 30 ℃. The result shows that the main drug and related substances could be well separated and detected effectively, different impurities can be detected effectively, and there is a good linear relationship between the mass concentration of formononetin and impurity A, B, C, D, E, F and G and peak area in the range of 0.060~4.004 μg/mL(r=0.999 8), 0.056~3.756 μg/mL(r=0.999 3), 0.039~3.902 μg/mL(r=0.999 6), 0.060~4.026 μg/mL(r=0.999 5), 0.058~3.878 μg/mL(r=0.999 3), 0.058~3.869 μg/mL(r=0.999 5), 0.060~3.977 μg/mL(r=0.999 5) and 0.040~3.952 μg/mL(r=0.999 4), respectively. The RSD of instrument precision, intermediate precision and stability test is no more than 2.0%, and the average recovery of impurities is in the range of 98.49%~101.76% with the RSD in the range of 0.37%~1.37%(n=9). The method is simple, reliable and accurate, and can be used to detect related substance in sodium formononetin-3'-sulfonate.
2017, 38(1):39-45. DOI: 10.7535/hbkd.2017yx01007
Abstract:The detection method of characteristic chromatogram of Pyrrosia leaf Formula granules by HPLC-DAD is established. The analysis is performed on a InertsilR ODS-2 C18 column(4.6 mm×250 mm,5 μm) with a gradient mobile phase of methanol-0.5% formic acid at a flow rate of 1.0 mL/min. The detection wavelength is 265 nm, the column temperature is 30 ℃, and the injection is 10 μL. The Similarity Evaluation System for Chromatographic Fingerprint of TCM (Version 2012A) is used for the 10 batches of Pyrrosia leaf formula granules quality assessment, and cluster analysis is obtained based on characteristic peaks in detected samples. Two peaks are confirmed by comparison with the chromatograms of the standard substances. Nine characteristic peaks are found through multipoint revise and the similarity evaluation system. Similarities of 10 batches of Pyrrosia leaf formula granules are all more than 0.85 and the analyzed samples are geographically classified into three classes. The method has good characteristics and specificity of accuracy, reliability, and repeatability, and can be used for the quality control of Pyrrosia leaf formula granules.
2017, 38(1):46-51. DOI: 10.7535/hbkd.2017yx01008
Abstract:Functionalized ionic liquids are receiving increasing attention in the field of flue gas desulfurization due to its unique physical and chemical properties. Research progress on the field of SO2 removal by ionic liquids (ILs) including guanidinium-based, amines-based and ether-based ILs is summarized. Industrial application of polymerization ILs and loaded ILs to desulfurization is reviewed. Relevant suggestions on industrial application of ionic liquids based on fundamental research are put forward. The first thing is to develop functional ionic liquid for desulfurization，and thus investigate and propose its desulfurization mechanism and model; the second is to carry out the research work on immobilized ionic liquid, and explore its recycling properties, thus prolonging its service life.
2017, 38(1):52-58. DOI: 10.7535/hbkd.2017yx01009
Abstract:The problem of longitudinal safety interval of aircraft during parallel air route flight is discussed in order to solve the problem of flight safety and improve the accuracy of the collision risk. The traditional EVENT model is improved by using elliptic cylinder as the collision template. The performance and application field of broadcast automatic monitoring (ADS-B) are introduced, and based on the improved EVENT model, a method for calculating the parameters through using ADS-B monitoring technology is put forward. Taking E500 aircraft as a model example, the minimum safety distance is calculated. The results are in line with the international civil aviation organization's flight safety index, which provides an effective method for the study of risk classification based on ADS-B technology.
2017, 38(1):59-65. DOI: 10.7535/hbkd.2017yx01010
Abstract:Six rotor eppo drones's load change itself in the job process will reduce the aircraft flight control performance and make the resistance to environmental disturbance being poor. In order to improve the six rotor eppo unmanned aerial vehicle (UAV) control performance, the UAV in the process of spraying pesticide is analyzed and the model is constructed, then the eppo UAV time-varying dynamics mathematical model is deduced, and a fuzzy adaptive PID control algorithm is proposed. Fuzzy adaptive PID algorithm has good adaptability and the parameter setting is simple, which improves the system dynamic response and steady state performance, realizing the stability of the six rotor eppo UAV flight. With measured parameters of each sensor input in to the fuzzy adaptive PID algorithm, the corresponding control quality is obtained, and the stable operation of aircraft is realized. Through using Matlab to simulate the flight system and combining the practical experiments, it shows that the dynamic performance and stability of the system is improved effetively.
2017, 38(1):80-86. DOI: 10.7535/hbkd.2017yx01013
Abstract:In order to study the optimal extraction process of crude polysaccharides from Pleurotus eryngii, with fresh fruiting of Pleurotus eryngii as raw material, the influence of extraction time, solid-liquid ratio, and temperature, etc. on the extraction efficiency is analyzed using the hot water extraction method. Box-behnken design(BBD) is used for response surface analysis, and the optimal condition is as follows: extraction temperature of 47 ℃, extraction time of 4.9 h and solid-liquid ratio of 1∶19 (g/mL). Among the factors，the heating temperature has the greatest influence on the extraction rate, then the material liquid ratio, and at last the extraction time. Under this condition, the extraction rate of crude polysaccharide from Pleurotus eryngii reaches the maximum of 5.66% which is close to the actual verification value. Therefore, the optimization of the extraction condition of crude polysaccharides from Pleurotus eryngii by using response surface method is reasonable and feasible, and it provides a theoretical basis for the industrial application of crude polysaccharide extraction from Pleurotus eryngii using hot water.
2017, 38(1):87-93. DOI: 10.7535/hbkd.2017yx01014
Abstract:In order to improve the photocatalytic properties of P25, using urea, thiourea and methionine as modifiers, the modified catalysts N-P25, S-P25 and N,S-P25 with visible light catalytic activity are prepared by grinding-calcination method, respectively. The properties of modified photocatalysts are characterized by scanning electron microscopy (SEM) and UV-Vis absorption spectroscopy, and the degradation property of acid red B in visible light by the modified photocatalysts is investigated. The results show that the wavelength ranges of light response of the N-P25, S-P25 and N,S-P25 modified photocatalysts expands, intensive absorption appears in both ultraviolet and visible light regions; the N,S-P25 prepared under the condition of calcination temperature of 700 ℃ and calcination time of 20 h has the highest catalytic activity on the degradation of acid red B, and the degradation reaction of acid red B in visible light conforms to the apparent first order reaction kinetics. The study proves that the modified P25 catalyst can improve the photocatalytic degradation of acid red B under visible light conditions, and enriches the research ideas of photocatalytic degradation of dye wastewater in visible light.
2017, 38(1):73-79. DOI: 10.7535/hbkd.2017yx01012
Abstract:In order to explore the propagation law of the impact elastic wave on the platform, the experimental platform is built by using the specific isotropic materials and anisotropic materials. The glass cloth epoxy laminated plate is used for anisotropic material, and an organic glass plate is used for isotropic material. The PVDF sensors adhered on the specific materials are utilized to collect data, and the elastic wave propagation law of different thick plates and laminated plates under impact conditions is analyzed. The Experimental results show that in anisotropic material, transverse wave propagation speed along the fiber arrangement direction is the fastest, while longitudinal wave propagation speed is the slowest. The longitudinal wave propagation speed in anisotropic laminates is much slower than that in the laminated thick plates. In the test channel arranged along a particular angle away from the central region of the material, transverse wave propagation speed is larger. Based on the experimental results, this paper proposes a material combination mode which is advantageous to elastic wave propagation and diffusion in shock-isolating materials. It is proposed to design a composite material with high acoustic velocity by adding regularly arranged fibrous materials. The overall design of the barrier material is a layered structure and a certain number of 90°zigzag structure.
2017, 38(1):66-72. DOI: 10.7535/hbkd.2017yx01011
Abstract:In order to explore a new method for testing the fabric abrasion resistance, a homemade abrasion tester is designed and manufactured. The principle, structure and test method of the homemade abrasion tester are introduced. The crease points on fabrics are rubbed using the abrasion tester under certain air pressure and the abrasion of fabrics is reflected on real time through the change of gas flow. The change of gas flow is converted into equivalent aperture by Bernoulli equation and the equivalent aperture is used to evaluate the abrasion resistance of the crease point on fabric. Three measuring parameters of friction velocity, gas pressure and fabric thickness influencing on the abrasion resistance of crease point on down fabrics are tested by orthogonal experiment. The influence of the three elements on the abrasion resistance is analyzed. The results show that the homemade abrasion tester can represent the abrasion resistance of crease point under certain conditions. The gas pressure and fabric thickness have significant influence on the abrasion resistance, but the influence of friction velocity is not significant. Above all, the gas pressure has the most high influence. The research result prevides reference for improving the abrasion resistance of crease points on down fabrics.
2017, 38(1):94-100. DOI: 10.7535/hbkd.2017yx01015
Abstract:In order to solve the problem of having excessive organics, total phosphorus(TP) and other pollutants in secondary effluent from municipal wastewater treatment plant, Fenton oxidation-coagulation unit is adopted to treat the wastewater. The treatment efficiency of the treatment process is discussed through the orthogonal experiments and the single factor experiments. It shows that the removal efficiency of COD, colority and TP are 97.5%, 96.7% and 99.2% respectively under the optimal reaction conditions that the Fenton oxidation reaction time is 40 min, initial pH value is 6.0, the dosage of FeSO4·7H2O and H2O2 are 600 mg/L and 850 mg/L respectively，the coagulation reacting pH value is 8.0 and the dosage of APAM is 3.0 mg/L. The water quality can meet the first A level discharge standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918—2002).The process, as the advanced treatment technology of wastewater, can be widely used in the advanced treatment of refractory pollutants in the municipal wastewater treatment plant.