bluuebunny/crossref_metadata_2025_split huggingface dataset:
Performance Seismic Design of the Retrofit of a University Library using Non-Conventional Methods
Authors: Chavez B , Matias C , Huaco G 
Published: February 2020

Abstract
This research proposes a structural retrofit of a reinforced concrete building older than 50 years. The structural system is dual using frames and walls, having an area of 1980 m2 and 4 levels with a total height of 15.50 m. There are three unconventional methods to retrofit this infrastructure. The first is to install steel jackets with bolt anchors. The second methodology is through the use of jackets and anchors of Carbon Fiber Reinforced Polymers (CFRP). The third alternative is through reinforcement of walls with 2 diagonal struts made with CFRP sheets as struts, also installing CFRP anchors at each end of both struts to ensure that these sheets work up to their high levels of tension. These anchors together with the diagonal plates contribute to give ductility to the wall and in turn resist the effects of sliding at the base, a fault that is very common in rigid structures such as walls. Each unconventional reinforcement methodology used in this research is validated using laboratory tests results of reinforced columns and walls retrofitted with every of the three innovative methods. Nonlinear static analysis - Pushover of each alternative was performed and compared with the demand for the 1974 earthquake in Lima, scaling 3 seismic records to a PGA of 0.45g, which is the acceleration of design in Lima. It is shown that these proposals are effective in providing levels of shear base and displacement capacity in the inelastic design. For the 0.40mx0.80m columns, the results show that both reinforcements increase ductility by more than 10%; on the other hand, the proposal of reinforcement in the walls of 40cm thick, produced even better results increasing ductility by 100% and shear base by 100%.
Thermal Simulation and Sonoporation Experiment Based on a Focused Ultrasonic System
Authors: Liu Zihong , You Hui , Zhang Ping , Lin Ronghui , Chang Yongjia 
Published: February 2020

Abstract
This paper aims at analyzing ultrasonic thermal effect and sonoporation based on a focused ultrasonic experiment system. The numerical analysis, about cavitaion conditions and ultrasonic thermal effect using the coupling model of pressure acoustic and bioheat transfer, were given, in which the temperature rise trend is identical to the conclusion in the literature [2]. According to the simulation analysis of ultrasonic thermal effect, temperature rise is approximately 18.5K near the focal spot with Ultrasonic radiation for 60s, which had little effect on 293T cell viability. In the acoustic chemical experiment, 293T cell viability is about 85% at 60s of the ultrasound irradiation, which was observed by 200× fluorescence microscope. The cell states of survival and abnormal was observed and analyzed in the sonoporation experiment at 60s of ultrasonic time.
Use of Geopolymers in the Treatment of Water Contaminated by Industrial Waste
Authors: Bernaudo I , Tagarelli A , Elliani R , Candamano S , Macario A , De Luca P 
Published: February 2020

Abstract
The present research aimed to study the use of geopolymers in the removal of heavy metals in water contaminated by an industrial waste. The geopolymer was synthesized and characterized beforehand in the laboratory while the industrial waste is the so-called zinc ferrite that comes from a zinc processing industry in southern Italy. It is known that this waste contains within it a variety of elements that over time can be released if in contact with water. The study was carried out preparing different aqueous systems containing predetermined quantities of zinc ferrite and geopolymer. The systems were stirred for different reaction times and at room temperature. Subsequently, after the established time the systems were filtered and the resulting solution was analyzed by a mass spectrometer (ICP-Ms). The variation in the concentration of various elements (such as Fe, Zn, Pb, Mn, Ca, Mg, Na and K) was followed as a function of contact times. The obtained data allowed to evaluate the effectiveness of geopolymers in the removal of metals released by zinc ferrite in water. In particular, the geopolymers, in the systems studied, have shown particular propensity in the abatement of iron and zinc which has reached 100%, followed by an abatement of about 95% for Mn and Pb after a 1.5-hour contact time.
Theoretical Analysis of Supersonic Low Reynolds Number Flow Control Technique Based on Flow Mixing
Authors: Dachuan Xu , Zebin Ren , Zhiqiang Chen , Haifeng Wang , Longde Guo 
Published: February 2020

Abstract
The thickness of boundary layer increases rapidly in supersonic low Reynolds number flows. As a result, there will be shock wave-boundary layer interference. The disturbances of downstream can spread upstream through in boundary layer because the flow in boundary layer is subsonic, which may decrease flow field uniformity and stability. The pressure of this type of flow is always very low. For the sake of flow continuity, the increase of flow pressure is necessary. A kind of supersonic low Reynolds number flow control technique was proposed. The high pressure supersonic flow jet-ted from plates which located in the flow channel blew away boundary layer, cut off the disturbances spread from downstream to upstream, and eliminated the shock wave-boundary layer interference. The pressure of primary flow was also increased by mixing with the high pressure jetting flow. The calculation model of this flow control technique was established. A group of standard inputs were selected to calculate the parameters of flow and the preliminary law of flow was also obtained.
Rapid Aerodynamic Calculation Method for Hypersonic Gliding Vehicle
Authors: Zhang Bin , Feng Zhiwei , Xu Boting , Yang Tao , Peng Wuyu 
Published: February 2020

Abstract
The accuracy and efficiency are always conflict in the process of aerodynamic shape design, especially for hypersonic gliding vehicle (HGV). In this work, a rapid aerodynamic calculation method for hypersonic gliding vehicle is conducted, including shape parametric modelling, automatic mesh generation and rapid computational fluid dynamics (CFD) method. In details, the aerodynamic shapes of HGV are modelled by multi-section solids, which parameterized by class function/shape function transformation (CST) method and exponential function. Then, the computational meshes are generated automatically in two steps: one is generating surface mesh by Delaunay method, and another is generating volume mesh by adaptive Cartesian method. In order to minor the computational cost, the hypersonic aerodynamic are analysed by combining the Euler equation and the viscosity force. We have tested the accuracy and efficiency of this rapid aerodynamic calculation method in two flight states for a typical HGV. Compared with Navier Stokes (NS) equations, the results shown the errors of axial aerodynamic force are all less than 6%, but time costs are reduced in hundreds of times.
Study on LabVIEW-based Aviation BLDCM Control System
Authors: Zhang Linhai , Yao Yeming , Xu Lilin 
Published: February 2020

Abstract
with the increasing market demand and rapid development of aircraft technology, more electric concept has become an important trend for the future development of aircraft. Therefore, motors are widely applied in the aviation field increasingly. This paper mainly introduces the hardware environment and LabVIEW implementation process in the development of aviation high speed and high voltage BLDCM control system based on NI hardware and software platform. The test shows the control system is able to realize effective control over aviation BLDCM. This system is highly flexible and can lay a foundation for the algorithms used in subsequent related research efforts.
Experimental Analysis on Combined Vibration and Acoustics Test of a Satellite
Authors: Tingfei Yan , Haiyang Gao , Shuhong Xiang 
Published: February 2020

Abstract
Random vibration tests and acoustics tests are typical environmental testing approaches for verifying the dynamic environmental adaptability of a satellite, which should be selectively carried out on the ground before launch. Existing test criteria suggests that large spacecraft should be excited in a reverberation chamber, while a shaker should be used for a small spacecraft. With the development of experimental technique of environment simulation, the combined vibration and acoustics (vibro-acoustic) test are increasingly investigated for reproducing a more realistic environment and avoiding an over test or an under test. However, few studies have been published on coupling effect of combined vibration and acoustic test of a full scale prototype satellite. This paper discusses the equivalence between random vibration and acoustics excitation for satellite ground testing. The experiment results have shown advantages of the combined test in reproducing flight environment. And the coupling effect and distributions of high frequency response attenuation during the combined vertical vibro-acoustic test is observed and analyzed in detail.
Comparative Research on Early Warning Determination Methods of Spacecraft Collision
Authors: Hongqiang Sun , Zhanyue Zhang , Ewen Hu 
Published: February 2020

Abstract
With the development of space science, more and more spacecraft have entered into the space, and the operating environment of spacecraft in space has become more complex. Various signs show that the future space field will face congestion, collision and other safety problems, so the collision warning in space is becoming more and more important. It is the primary guarantee for the spacecraft to carry out its mission in space in the future to obtain the early warning information and complete the avoidance within the early time to ensure the environmental safety. In this paper, based on the perspective of collision warning and determination methods, two kinds of warning and determination methods are introduced, including BOX region method and probability method. In addition, by comparing the warning efficiency of these two methods, the results show that, under the same constraint, the probability method is more accurate and saves more space resources than the BOX region method. Considering that the spacecraft is limited in fuel and other resources when working in orbit, it is more scientific to adopt to avoid unnecessary maneuver and waste of resources.
Application and Research of Air Cushion Transportation in Flexible Assembly for Spacecraft
Authors: Yahong Zhu , Chengli Zhang , Shuai Xing , Xiaohuan Li 
Published: February 2020

Abstract
With the development of spacecraft, the problem of flexible transfer between large weight and large size spacecraft stations needs to be solved urgently. Air-cushion transporter is a special transporting platform for heavy load. It can effectively solve the transfer problem of large spacecraft. This paper introduces a parallel air-cushion vehicle for large cargo transportation. In this way, there may be a certain height difference on the road surface where the air cushion vehicle moves, which will affect the transfer. The air volume adjustment of the air cushion vehicle is introduced to ensure the smooth transportation method. Through test, it summarizes the key indicators of air-cushion transporting, which can provide reference for the research of large spacecraft transporting methods.
Simulation of Space Flexible webs on Capture Process Based on Nonlinear Finite Element Method
Authors: Xu Boting , Yang Yueneng , Zhang Bin , Yan Ye 
Published: February 2020

Abstract
Aiming at the problem of the space flexible webs collision during the space capture process, the general method of collision detection was given based on the nonlinear finite element method, and the collision dynamic model of the space flexible webs and target was established. In order to verify the versatility of the space flexible webs structure in different capture scenarios, the target capture position and attitude were changed respectively, and different capture scenarios were established to simulate and analyze the working conditions by using the finite element software. The results showed that the target position and attitude during the collision impact process is the key of the results of the flexible webs capture mission, which can provide some reference for the structural design and on-orbit task planning of the space flexible webs system.
Accuracy Control of Big-scale Space 3D Measurement System in Aircraft Digital Assembly
Authors: Cheng Yan , Xu Yuan-heng , Huang Xue-liang , Wang Lei 
Published: February 2020

Abstract
Large scale space measurement technology is one of the key technologies of aircraft assembly. The accuracy of measurement system affects the efficiency and quality of aircraft assembly directly. However, the accuracy of the measurement system depends on the process of constructing the measurement system. Therefore, this paper explores three principles of constructing high-precision large-scale space measurement system, through a large number of experiments and simulations.
Research on the Construction Technology of Knowledge Graph in Aviation
Authors: Wang Xue , Yang Xizhong , Fu Jiapan , Qiu Xuyi 
Published: February 2020

Abstract
In order to alleviate the overload of airspace information under the network environment and integrate the scattered and useful airspace information, the technical architecture of knowledge graph in the aviation field is proposed. This paper describes the technical architecture of aviation knowledge graph construction, including knowledge extraction, knowledge fusion, knowledge processing, knowledge update and other key technologies and applications. Finally, an instance of knowledge graph for air combat is constructed. The knowledge graph discovers the hidden relationship between task and maneuver through resource sharing and information mining, which can be used for mission optimization and maneuver prediction to assist air combat decision-making.
Analysis of the Influence of On-Board Temperature and Pressure Control System on Inert Gas Generating Performance of Hollow Fiber Membrane
Authors: Zhang Jing-yang , Luo Bi-tai , Hu Wen-chao , Shen Ping 
Published: February 2020

Abstract
Based on the typical on-board membrane separation system for fuel inerting, the mathematical models of temperature and pressure control subsystem and hollow fiber membrane were built with the coupled iterative numerical solution methods. While the temperature and pressure were controlled, the design area, nitrogen production effect of hollow fiber membranes were analyzed and compared with the situation of no temperature and pressure control in the full flight envelope by numerical simulation. Moreover, the root causes for those changes were found out. It shows that the method used in temperature and pressure control can increase the bleed air pressure and enhance the stability of temperature and pressure effectively. Compared with the situation of no temperature and pressure control, the temperature and pressure control method are able to decrease the demanded area of membrane by 42.3%∼51.7%. And there is no need to adjust the membrane area for condition of low nitrogen production efficiency. But it also decreases the highest nitrogen production efficiency by 9.4% and increase the minimum oxygen concentration by 0.65%. The rate of flow has the most significant effect on nitrogen production. These phenomena are caused by the effects of the rate of flow, pressure, temperature and membrane area.
Application of Kalman Filter in Satellite Propellant Remaining Prediction Technology
Authors: Yin Wenjuan , Cao Zhiwei , Wang Mengjie 
Published: February 2020

Abstract
The prediction of the propellant remaining is related to the use efficiency of the propellant, it is of great significance for the estimation of the remaining life of the spacecraft. The gauging uncertainty of the commonly used propellant remaining prediction method is high, and the single gauging method can not meet the higher requirements of long life satellites on-orbit management. In order to further improve the accuracy of the spacecraft propellant remaining prediction, combined with the characteristics of the existing propellant remaining estimation method, a real-time estimation method of propellant remaining is proposed. The algorithm combines two gauging methods to further improve the reliability of propellant consumption estimation. The practical application shows that the algorithm can effectively reduce the disadvantages of the BK method and the PVT method, and provide a more reasonable estimation of the real-time propellant remaining.
Characterization and Uncertainty Analysis of the Interlaminar Inelastic Properties of Unidirectional Fibre-reinforced Composites
Authors: He Tiren , Liu Liu , Xu Jifeng 
Published: February 2020

Abstract
The compression failure mode has been achieved through changing the SBS (Short Beam Shear) experiment parameters, and the nonlinear constitutive relationship along thickness direction for the typical specimens loaded in 1-3 principal material plane has been computed iterative by FEMU with the reconstruction strain field and the numerical simulated stress data of FEM model. The uncertainly of the constitutive parameters is induced by the measurement system noise in the DIC technique and the approximation error in the displacements and strains smoothing algorithm. The covariance matrix of the extracted material constitutive parameters has been given explicitly. Three material constitutive parameters were identified from a customized short-shear experiment simultaneously using an estimated optimal reconstruction mesh size as an illustration. Sensitivity of measurement noise and reconstruction parameter on extracted material properties has been investigated. The effects of region of interest (ROI) and DIC image number on uncertainties of extracted material properties have been addressed. It is suggested that there exist an appropriate ROI and the number of images, from which reliable material parameters can be identified, but much more data used in identification process always lead to smaller standard deviation and COV. It is observed that the material constants used to characterize the interlaminar stress-strain behavior show strong robustness to the measurement noise. Another key finding is that the reconstruction parameter in the global finite-element based approximation approach is critical for reliable material properties identification. Its value has to stay close to optimum for guaranteeing reliable identification of material properties.
Design and Experimental Research of Rope Missle
Authors: Wu Haoting , Zhao Lei , Wu Pingjun , Xiao Feng , Guo Yongxiu , Jiang Ming , Geng Junlei , Yang Lei 
Published: February 2020

Abstract
The UAV (unmanned aerial vehicle) unfolding guide rope is the construction process adopted in the tension stringing of overhead power transmission line. At present, due to the limit of UAV control precision, the function of threading the guide rope into the paying-off sheave groove directly cannot be realized, and we can only unfold the guide rope of UAV to the cross arm of iron tower, and then, make the operation personnel at height transfer the guide rope into the steel wire groove of paying-off sheave. Therefore, the construction efficiency of this process is relatively, and there is operation at height, with a certain safety risk. In this project, it is planned to develop a launching device carried by UAV, and this device uses the compressed carbon dioxide (CO2) which is relatively safe as power source, which realizes the instantaneous release of compressed air through electromechanical servo control, and then generate the power which promotes the “rope missle” to fly. The tail of “rope missle” is connected with guide rope, and when it flies forward, the traction guide rope will move forward synchronously. After the “rope missle” threads into the sheave, the compressed air will be released completely, and then, the “rope missle” will transfer into the motion of a free falling body, thus further driving the falling of guide rope, so as to realize the function of “rope missle” tracts the guide rope to realize threading into the paying-off sheave.
Investigation on Application of Closed Cavity Inductively Coupled Plasma in Inlet Stealth
Authors: Xinmin Han , Wenyuan Zhang , Xiaolong Wei , Haojun Xu , Junlin Chen 
Published: February 2020

Abstract
The design of inlet into S-shaped is a stealth method with limited effect. The ICP generated in closed quartz chamber is an effective solution to improve the stealth effect. In this paper, an inductively coupled plasma (ICP) generator with the size of 30cm×30cm×2cm which could be conformal with S-shaped inlet was designed, the discharge experiment was carried out to study the discharge configuration of air ICP and the distribution of the electron density in the core area of ICP under 100Pa and different discharge power was diagnosed with microwave interference method. On this basis, the three-dimensional electromagnetic model of inlet and the plasma generator were established and the finite-difference time-domain method was used to calculate the broad-band scattering parameter of the inlet with and without the ICP generator. The variation of radar cross section area (RCS) with the azimuth angle, electromagnetic wave frequency and discharge power of ICP was studied. The result indicated that the ICP generator could effectively improve the stealth effect of S-shaped inlet in the head direction.
The Numerical Simulation of Temperature Field in Friction Stir Welding of 7075 Aluminium Alloy
Authors: Ma F J , Fu D Y , Liu Y , Yang D P , Zhang S F , Sha Z H 
Published: February 2020

Abstract
Considering friction heat generation between rotating tool and workpiece and plastic deformation heat generation of material, a numerical simulation model of friction stir welding of 7075 aluminium alloy sheet was established. In this study, the temperature field of the welding process was analysed, and the effects of different stirring speeds and welding speeds on the temperature field were compared. The results show that the high temperature region is located below the shoulder and diffuses outward in a ring shape. After the welding is completed, the workpiece center temperature is high and the ambient temperature is low. The stirring speed of the tool has a large effect on the peak temperature during the welding process. The effect of the welding speed on the peak temperature is less than the stirring speed. The comparison shows that the welding temperature is about 478°C at a stirring speed of 800r/min and a welding speed of 120mm/min, which is a suitable welding parameter.
Study of Different Micro Milling Blades on Milling Titanium Alloy TC4
Authors: Zou ZiChuan , Zhao XianFeng , He Lin , Jiang XueTing 
Published: February 2020

Abstract
With the development of micro-miniature, micro-milling technology has been widely used. Due to the difference in workpiece materials and processing technology, the selection of the edge structure of the micro-milling cutter during processing is particularly important. This paper analyzes the influence of micro-milling of titanium alloy TC4 on cutting force, cutting heat and tool stress distribution for micro-milling cutters with a diameter of 0.1mm based on Definite-3D, ANSYS and other finite element simulation software.The results show that the spiral-edge micro-milling cutter can effectively reduce the cutting force and cutting heat compared with the straight-blade micro-milling cutter. Considering the rigidity, strength, cutting performance and practicability of the tool, the traditional double-edged spiral-edge micro-milling is still the best choice. The research results of this paper can provide a theoretical basis for the design of micro-milling tools.