bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Lost-foam casting Technology in Grate of Hot blast stove and Solution of Defects
Authors: Chen Yanjie 
Published: November 2020

Abstract
Lost-foam casting Technology has been applied in Manufacturing the grate of hot blast stove. According to the requirements of structure and tolerance dimension, the lost-foam unit of grate is prepared with expandable polystyrene resin beads. RTCr2 is used as the material of grate, which is poured at 1360-1380°C by Top post system. And the negative pressure range is 0.04-0.05MPa. The results show that the surface of the casting is relatively complete, and the internal structure of the casting is dense. Through inspection, the quality performance, structure dimension and manufacturing precision of casting products can meet the requirements well. But there are also some disadvantages, such as inner hole sticking sand, surface sand hole, shrinkage cavity, air hole, sand inclusion, slag inclusion, mechanical processing edge breaking. Then some corresponding effective repair methods are used to solve the defects, which guarantee the quality of the products. Some lost-foam casting data and control measures have been accumulated, which are beneficial to continuously improve the lost-foam casting process and master the key casting technologies such as lost-foam casting and hot metal casting.
Research on the Effect of Stiffness Ratio Between Frame and Core Tube on Seismic Response of Super High-rise Building Under Frequent Earthquake
Authors: Yanhua Gao , Zhili Sui , Fenghong Zhang , Shuaijun Chen 
Published: November 2020

Abstract
The stiffness ratio of frame to core tube has an important influence on the seismic behavior of frame-core tube hybrid structure which is a high-rise building structure system widely used in the world. In this paper, nine models of concrete-filled steel tubular frame-concrete core tube super-high-rise hybrid structures with different stiffness ratios are established by using finite element method, and the effect of stiffness ratio on inter-story displacement angle, top displacement and base shear force of super high-rise buildings under frequent earthquakes is studied. The results show that, with the increase of stiffness ratio, the inter-story displacement angle, the top displacement and the base shear force change complicatedly, the maximum base shear force increase, and the maximum inter-story displacement angle and the maximum top displacement first increase then peak, and that the strengthening layer with outrigger obviously improves the deficiency of lateral stiffness caused by height. This study provides a reference for reasonable determination of stiffness ratio and optimization of structural seismic design.
Optimum Design of Central Console Structure for an All-Terrain Vehicle Based on Topography Optimization
Authors: Chen Yajuan , Gu Li , Li Xianglin 
Published: November 2020

Abstract
The mechanical properties of plastics are obtained through material tests. The strength characteristics of the plastic middle console structure of a terrain vehicle under the vibration loads on the pavement are simulated by using the finite element analysis theory. On this basis, the morphology optimization technology is used to improve the structure. Meanwhile, the model is redesigned and verified according to the optimization results, which solves the problem of insufficient strength of the original structure. It provides an effective reference for the design of plastic structural parts of similar vehicles.
Research on MES-oriented Reducer Process Planning System
Authors: Zhang Jun , Zhang Zhihao , Zhang Xiangru 
Published: November 2020

Abstract
In the railway locomotive reducer manufacturing industry, due to the characteristics of multi variety and small batch, the efficiency of process planning is low, the cycle is long, and the production link is seriously disconnected. To solve this problem, an integrated process planning system based on Manufacturing Execution System (MES) was proposed, this system used decision-making models of process based on typical process library to make process planning more efficient. At last, ASP.NET platform and C# programming language were used to complete the development of the system.
Research on Location of Charging Station of Electric Vehicle Based on Improved TLBO
Authors: Wang Xin , Wang Jianjian , Huang Shunping , Lv Xiaotian 
Published: November 2020

Abstract
With the rapid development and popularization of electric vehicles, people pay more and more attention to the construction and planning of charging stations for electric vehicles. In this paper, an improved Teaching-Learning-Based optimization algorithm is proposed in the problem of charging station for electric vehicles. From the user’s perspective, the objective of optimization is to minimize distance and driving cost. Simulation experiment is carried out for planning an area. The results show that ITLBO can solve this problem with the good stability and fast convergence speed.
Study on real-time detection method for electron beam selective melting process
Authors: Wang Jiaming , Yin Bohua , Liu Junbiao , Wang Pengfei , Sun Botong , Han Li 
Published: November 2020

Abstract
In order to solve the problem of lack of effective and real-time monitoring evaluation method for electron beam selective melting (EBSM) processing, a technique of acquiring real-time secondary electron (SE) imaging through layer-by-layer scanning is presented, which could monitor the defects of components. Basic design scheme, including the Electron beam scanning system, signal processing and imaging system, is introduced in this paper. Capability of generating digital image and choosing different monitoring area for the real-time monitoring system has been verified by series of experiments. Results suggest that the maximum resolution of the prototype has reached 0.3mm.
Study on trajectory optimization algorithm of industrial robot in joint space
Authors: Luyang SHEN , Yichao PENG 
Published: November 2020

Abstract
Aiming at the problem that the trajectory deviation of six-degree-of-freedom industrial robot is large, a robot model is established by Denavit-Hartenberg parameter method, and forward kinematics and inverse kinematics are analysed. Simulation is conducted on the Robotics Toolbox industrial robot model in MATLAB, and cubic polynomial interpolation and cubic polynomial interpolation are used to plan the terminal motion trajectory of the industrial robot in joint space. The results show that the error of the terminal motion trajectory is smaller in the fifth order polynomial interpolation.
A Structure-variable Bayesian Network Model for Vehicle Threat Assessment
Authors: Du Yue , Liu Qianru , Cen Ming 
Published: November 2020

Abstract
In driving assistant system and automated driving system, accurate and real-time threat assessment is necessary to improve the safety. Besides moving targets, the influence factors of safety also include environment and driver. To evaluate the threat level of host vehicle, a modified Bayesian network (BN) model is proposed in this paper. In addition to objects’ state and environment condition, the driver’s subjective factor is also considered to structure a more adequate model and assess a more accurate threat level, including physical factor and psychological factor. Because of the rate of change of various factors is different greatly, the structure-variable Bayesian network (VBN) model is proposed to increase the computational efficiency. Finally, simulation is designed to verify the availability of two kinds of network models, and it verifies that the VBN is better in computational efficiency than static BN.
Influence of motion characteristics of dual stealth aircraft on monopulse radar performance
Authors: Bao Lei , Wang Chun-yang , Tao-dong  , Bai Juan , Wei Sheng-Jun , Tan Ming , Liu Ming-jie 
Published: November 2020

Abstract
In view of the difficulties to effectively evaluate the influence of penetration of dual stealth aircraft formation on monopulse radar angle tracking error under different flight speeds, the dynamic track model of the dual stealth aircraft under different navigation speeds is established for the first time, and the acquisition method of the dynamic Radar cross section of the dual stealth aircraft formation under different navigation speeds is proposed; the dynamic signal-to-noise ratio of the dual stealth aircraft under different navigation speeds is used as a reference and the model of single pulse radar angle tracking error is established. This paper analyzes the influence of the formation motion characteristics of dual stealth aircraft on the angle tracking error performance of monopulse radar. It is the first time to conclude that the acceleration of the navigation speed of dual stealth aircraft will increase the angle tracking error of monopulse radar when there is no interference.
Damage recognition based on Generalized Genetic Algorithm
Authors: Zhang Huaxin 
Published: November 2020

Abstract
A new optimization approach to solving problems concerning structural damage identification with finite element model is introduced. In this approach, the generalized genetic algorithm is applied to damage recognition with its advantage of directed evolution and two-phase transformation. To employ the method, objective function is constructed by the residual of modal frequency and incomplete modal mode. Meanwhile the recombination and mutation operators are also improved with sparsity constrain. The results show that modified generalized genetic algorithm performs better in convergence speed and accuracy than traditional optimization approach in damage identification.
Research on Centrifugal Mechanism Based on Microfluidic Chip
Authors: Lulu Zhou , Yuan Ding , Haitao Ma 
Published: November 2020

Abstract
In order to improve the accuracy and safety of blood test, the research of centrifugal mechanism in automatic blood group analysis system is proposed. According to the theoretical research of centrifugal microfluidic, the structure of microfluidic chip is designed; According to the requirements of blood centrifugation, the appropriate motor is selected, and the three-dimensional model of the centrifugal mechanism is established by using Solid Works software, and the structure of the centrifuge is determined; The success rate and average time were calculated by centrifugation test of microfluidic chip on automatic blood group analysis system. The rationality and validity of the centrifugal structure were verified.
Simulation and Design of the ZW Type Liquefied Petroleum Gas Compressor Crankshaft
Authors: Fan Hengliang , Li Dasheng 
Published: November 2020

Abstract
The crankshaft is the key parts of piston compressor,the fatigue strength of the crankshaft of compressor for the accurate analysis can greatly enhance the operation reliability of the compressor. Taking ZW-0.8/10-16 air-cooled vertical two-cylinder single-acting liquefied petroleum gas compressor as an example, the Solidworks software has been utilized to carry out the three-dimensional model of the crankshaft firstly,and then the risk point of fatigue failure of the crankshaft may be found by the compressor crankshaft finite element analysis. The optimization model by ANSYS software has been established, and the optimized crankshaft strength are verified at last. The results show that the finite element method can be more accurately for crankshaft fatigue analysis, and thus it provides certain theoretical basis for the design and improvement of the crankshaft.
Numerical simulation of wind pressure distribution outside cooling tower and coefficient analysis of the regression curve
Authors: Sun Xiao-yong , Yuan Zi-hou , Yuan Yi-chen , Hu Xin-rong 
Published: November 2020

Abstract
In order to provide accurate wind load for the cooling tower design, numerical simulation of external wind pressure of a 155-meter high cooling tower is carried out in this paper. The results are in good agreement with the field data. It shows that the numerical simulation method is feasible. The numerical simulation data are also analyzed by regression, an expression consistent with the load specification form is obtained, and the mechanical significance of expression coefficient is also analyzed.
Kinetics of the reaction of SiO2 and MnO reduced by C in molten copper with carbon saturated
Authors: Huang Honghong , Chen Jianbin , Pan Wenbo , Zhao Minghui 
Published: November 2020

Abstract
In order to study the effect of matrix metal species on the kinetics of the reaction of Si02 and MnO reduced by C in molten copper with carbon saturated, the experiment, in which a preliminary slag with the composition of 38%CaO-38%SiO2-20%Al2O3-2%MnO-2%MgO that was placed in a graphite crucible and reacted with pure metallic copper at 1450°C under the atmosphere of pure CO, was carried out. The kinetics of both the reactions of Si02 and MnO in molten slag reduced by C in molten copper with carbon-saturated (2[C]sat.in Cu + (SiO2) = 2CO(g) + [Si]in Cu and [C]sat.in Cu + (MnO) = CO(g) + [Mn]in Cu) have been studied by studying the changes of the concentration of Si and Mn in molten copper with carbon-saturated, and the reaction order and reaction rate constant of the two reactions have been obtained. The results show that: (1) The reaction of SiO2 reduced by C is 0.5th order reaction while it is -0.5th order reaction for MnO; (2) The reaction rate constant of the reduction of SiO2 reduced by C in molten copper with carbon-saturated is 7.50×l0−6 mass%0.5·s−1, while that of MnO reduced by C in molten copper with carbon-saturated is 5.52x10−6 mass%1.5·s−1; (3) In this study, the reactions of SiO2 and MnO reduced by C in molten copper with carbon-saturated is a slow reaction and the time for the reaction equilibrium is more than 22 hours.
Analysis of oil pump vibration in long distance oil transportation system
Authors: Lin Wubin , Shi Baohu , Li Weiming , Li Zhihai , Yu Wei 
Published: November 2020

Abstract
The dynamic forces of mechanical and hydraulics may cause vibrations and noises of centrifugal pumps. To prevent the pumps from the vibrations and noises, we investigate the relationship between the oil properties/flowrate and vibration levels. The time-domain analysis and spectral characteristic analysis are used to analyze pump vibration data, it is found that the vibration level is more sensitive for the lightweight oil, the vibration becomes more severe when a specific adjacent pumps run together. Several modification suggestions are provided to the pumping station for preventing pump failure.
Renewable, Sustainable and Natural Materials on Food Packaging: Primary Data for Robotically Detect Packaging Shape in Logistics
Authors: Chaichana Thanapong 
Published: November 2020

Abstract
In the past decades, plastic packaging was a key material to preserve, protect, store, and transport food products. It was shown in food logistics from the manufacturers to consumers. The cost of making plastics is cheap. It was determined by the energy input that used to process them. Ingredients used to create plastics are very inexpensive. Furthermore, food packaging is a container. If it made from plastic material, it was also durable and last long over the shelf life of foods. Due to the sustainability concerns, using plastic packaging will cause the environment issues. Recovering the environment will help the earth to remain supporting life. This research aims to summarise the findings of smart packaging using different types of materials consisted of renewable, sustainable, and natural materials. A state-of-the-art food packaging geometry is explained. The data trends of intelligent food packaging were found to associate with sustainable development goals
Sediment material potential of Bone River as a prevention of silting and flood of Bone River estuary, Gorontalo
Authors: Napu S S S , Salama T H , Manyoe I N , Usman F C A , Samir I , Badaru A W W , Sugianti K 
Published: November 2020

AbstractBone River Estuary acts as a connecting lane between the three rivers (Bolango River, Bone River, and Tamalate River) with Tomini Bay. There is a port activity of goods located right on the river estuary, which is potentially disrupted due to the silting and can cause flood. This situation will undoubtedly disrupt port transportation routes and affect the economic condition of Gorontalo. The aim of this research is to identify the potential of sediment utilization at the downstream of the Bone River as an effort to prevent siltation at the estuary of river Bone, Gorontalo and to prevent flood. The method used in this research is field observation which includes observation of the morphological condition of research location and sampling. Samples will then be processed by means of sieving, separation, and classification of Sphericity sediment material by referring to zoning classification and Sneed and Folk classification. The result of histogram data showed that the sediment material was dominated by coarse sand size and grain size distribution dominated by coarse sand with size of phi is 0, on sediment data showed generally very leptokurtic with skewed skill or highly skewed.
Liquefaction Resistance of Sand Improved with Enzymatically Induced Calcite Precipitation based on Laboratory Investigation
Authors: Simatupang Minson 
Published: November 2020

Abstract
Liquefaction possibility assessment of soil in field is a prominent aspect on geotechnical engineering practice. Varieties of evaluations have been developed including penetration-based methods and shear wave velocity methods over the years since Seed & Idriss (1971) introduced the simplified method based on SPT data. With the focus on natural soil, those methods have been well evolved and have become the most frequent techniques used for evaluating liquefaction possibility of soil in situ. However, the capability of those empirical relations for evaluating liquefaction possibility of ground improved with EICP approach needs authentication. This research presents the capability of the available liquefaction evaluation charts for evaluating liquefaction possibility of ground improved with EICP approach. Investigations were conducted using cyclic triaxial apparatus integrated with bender element to evaluate liquefaction resistance, RL
, of EICP-improved sand as a liquefaction countermeasure. Parameters used were confining pressures, degrees of saturation during curing, calcite contents, and particles size of the sand. The test results were compared with the field performance charts of natural soils introduced by investigators. The results show that slight amount of the precipitated calcite can improve notably the maximum shear modulus of soils directly associating to Vs
improvement. The correlation between corrected resistance to liquefaction CRR (cyclic resistance ratio) and adjusted shear wave velocity Vs1
of EICP-improved sands, CRR-Vs1
correlation, tends to represent different tendency with that of unimproved sands. It appears that available liquefaction prediction curves are not capable for evaluating liquefaction possibility of EICP-improved ground.
Optimization of Steel Trapezoidal Box-Girders Using Genetic Algorithm
Authors: Mohammed Abbas H. 
Published: November 2020

Abstract
The goal of the structural design is to select sizes of member with an optimum proportion of the overall structural geometry in order to achieve the lowest initial cost design. Traditional steel box-girders, generally made of two plate flanges, two webs and a number of internal diaphragms, were used in many different fields, such as the structural, architectonical and bridge engineering industries. This study aims to establish a three-dimensional finite element model to minimize the total volume of a steel trapezoidal box-girders. The finite element ANSYS program package was used to determine the optimum total volume of the steel trapezoidal box- girder. ANSYS program has been coupled to MATLAB software. The genetic algorithm method of optimization is considered. In this analysis, the objective function is the total volume minimization. The design variables are the top flange width, bottom flange width, top flange thickness, bottom flange thickness, web height and web thickness. The constraints in this study include normal stress, shear stress and the displacement. The results of optimization for box-girder show a reduction in the total volume of a steel trapezoidal box-girder of about 38%.
Structure parameter effects of PCF on dispersion for singlemode regime based on V-parameter
Authors: Naife Riyadh Mwad , Kadhim Maha Khalid , Al-Zubaedi W. H. 
Published: November 2020

Abstract
In this paper, the dispersion of photonic crystal fiber (PCF) with five rings hexagonal geometry have investigated by varying different parameters. Many researchers had used small size of fiber ( small pitch distance) to ensure the single mode operation but decreasing the pitch distance leads to increasing the dispersion. It is important to get suitable pitch distance so that it is not large to avoid the multimode operation and not small to avoid high dispersion. In this work, this condition has obtained depended on V-parameter. We have estimated the V-parameter by using the step-index fiber approximation. The Pitch distance which has been obtained is 5 um with low dispersion and low V-parameter ≤ 2.405 (single mode operation). In addition, to get more low dispersion and V-parameter, a doping with two different value of Ge ( 4.1% and 7%) has been applied in core.
Structural behaviour of concrete beams reinforced with polyethylene terephthalate (PET) bottles wastes bars
Authors: Falih Raad S. , Dawood Abbas O. , Al-Khazraji Hayder 
Published: November 2020

Abstract
This paper examines the effect of using PET bottle waste as a reinforcement bar in concrete beams. Waste of PET bottles has been cut by a special tool to long strips with width of 6 mm and thickness of 0.5 mm and lengths ranging between 6000 mm for small bottles and 11000 for large bottles. Then, straps areused in the formation of PET bars in three different forms, two braids are formed and twisted bundles form.Each PET bar consists of 36 straps. PET bars are arranged in the same location of rebar as an alternative to the steel bars in the tensile area. Also, it are pre-tightened before casting with a special tool is designedfor this purpose in order to give it a straight texture and reduce the expected elongation. Five concrete beams with dimensions (150*200*1400)mm are used in this study.Two of themare controlledbeams with and witout tension steel reinforcement.The other three beams are reinforced withthree different forms of PET bottle waste bars. The achieved results are encouraged and unprecedented as the models containing rods achieved a maximum failure load of up to 25% of the failure load for specimens containing reinforcing steel bars.This technique enhancesits ability to be used as reinforcing bars in secondary structural members.