bluuebunny/crossref_metadata_2025 huggingface dataset:
A simple and rapid approach for the numerical simulation of non-linear elements and examples of its application
Authors: Loo W , Tuleasca L
Published: September 2019

In earthquake design philosophy non-linear inelastic damage is concentrated at predetermined locations in a structure, with the aim being to keep structural members critical for collapse avoidance, elastic. Non-linear elements can include the beam column joints in steel and reinforced concrete moment resisting frames, the nail connections of timber sheathing-to-framing shear walls, and the hold-down connectors of shear walls. To numerically model the seismic behaviour of these structures, it is critical to be able to quickly and simply model their respective hysteretic behaviours. It is particularly important to identify the parameters that will allow for the accurate replication of the degrading and pinching qualities of the force-displacement relationships. The authors summarise the use of a proprietary multi-linear plastic link, available in most finite element packages, in order to achieve this. A step-by-step process to model the links, from previous research, is described. This process considers the initial elastic stiffness, the force-displacement curve up to ultimate-strength, the post ultimate-strength degrading stiffness, and the reversing stiffness. The procedure can be adopted for both linear and rotational cyclic excitation. The modelled individual elements are subjected to a series of displacement-controlled time-history schedules and validated against the results from experimental tests. These elements, representing non-linear behaviour, are in turn implemented in various numerical models of shear walls. The authors apply cyclic loading to a model wall, and then for a separately designed wall apply seismic ground accelerations associated with the 2011 Canterbury earthquakes in New Zealand, and the results are presented. While the examples provided in this paper involve timber shear walls, the numerical modelling method will be equally useful for a variety of structures of different material types and configuration.
Study of the interface behaviour between fictile tubules bricks and mortar: numerical and experimental analysis
Authors: Scuro C , Tiberti S , Porzio S , Olivito R S , Milani G
Published: September 2019

This paper presents an investigation on the interaction between hollow clay bricks (caroselli) and mortar, aiming at obtaining frictional properties needed for a full description of the composite masonry material derived from these two constituents. A series of three-point bending tests is carried out on prism-shaped specimens representing typical arrangements of caroselli within mortar. Since no building code or guideline exists regulating this kind of tests, the specimens are built respecting the 1÷4 ratio between the transversal dimension and the length of the prism requested for mortar specimens subjected to three-point bending tests. The frictional properties of the interaction between the two constitutive materials are then derived through a series of back analyses concerning four different hypotheses on the actual degree of transmission of tangential stresses between caroselli and mortar. The numerical analyses are performed with the commercial finite element software ABAQUS. The obtained results sustain the experimental findings.
Interlaminar damage numerical modelling based on delamination growth of multi-layered composites
Authors: Hudișteanu I , Țăranu N , Isopescu D N , Munteanu V , Neculai O , Ungureanu D
Published: September 2019

A growing interest is nowadays directed towards the numerical modelling and monitoring of the interlaminar damage evolution of composite laminates, but also to the numerical mathematical models and techniques for simulation of the interface delamination. Modelling and investigation of the mechanical behaviour and fracture modes of the multi-layered composites is a complex issue, since other important parameters, such as fibre orientation angles, stacking sequences and configuration of the composite laminates are added to the anisotropic character of the composite materials. Different failure modes may occur on multi-layered composites, while the delamination type fracture may lead to a considerable decrease of the load carrying capacity of the composite structures. Interlaminar stresses, which occur in composite laminates as an effect of the presence of the free edges, have a major influence on the delamination onset and the delamination growth. The paper summarizes the numerical methods and the approaches considered in the simulation of the delamination growth of composite laminates. The obtained results are figured in terms of the opening displacement at the interface crack tip and stress distributions on the plies of the multi-layered composites.
Stability Analysis of a Scaled-Down Cold-Formed Steel Structure
Authors: Țăranu G , Bunea G , Olteanu-Donțov I , Venghiac V M , Ovidiu Toma I
Published: September 2019

The use of cold-formed steel CFS in building design has increased in the last period due to the numerous advantages it brings. However, there are relatively few research works on the behaviour of these types of structures to different loadings, especially compared to the hot-rolled steel structures. Unlike the hot-rolled steel elements, the CFS elements are prone to buckling failure. This paper investigates the stability of a scaled-down CFS structure considering the Eurocode EC and the American International Building Code IBC. First a comparison is done between the two codes in what concerns the stability analysis based on the theoretical aspects. Then, the results from the finite element program are presented, for both EC and IBC, and compared.
Numerical modelling of RC floor slabs
Authors: Mikula J , Szolomicki J
Published: September 2019

The aim of the paper is to conduct a comparative analysis of four calculation models of reinforced concrete floor slabs, that differ in geometry and the way of supporting. The investigation focuses primarily on the analysis of deflections of cracked reinforced concrete slabs, while monitoring the degree of determined reinforcement and the width of crack opening. The used programs were analyzed in terms of their capabilities, necessary in the work of a modern construction engineer, such as modeling of concrete rheology, determining the real reinforcement, finite element mesh variation, taking into account changes in stiffness of the cracked section, etc. The computational methods used in the software were also taken into account, including the possibility of performing non-linear analysis (mainly in the case of material non-linearity), updating the stiffness matrix (inelastic method) or considering possible stiffening of the concrete under tension. Each model was calculated taking into account the influence of shrinkage and without analyzing it, that required additional analysis of the ways of modeling rheology of concrete with use of computer programs.
Study of natural gas pipeline behaviour
Authors: Radermacher L , Mateescu T
Published: September 2019

In order to prevent incidents due to uncontrolled gas leakage and explosion/fires were devastating look at the factors that determine the safety in operation of gas networks made of polyethylene. Sustainability and safety in operation, lines of distribution networks and installations for use in natural gas represents a complex issue with implications for economic, social and environmental. Underground natural gas pipes are subjected to a series of prompts both static and dynamic which could lead to. damage. The complexity of the problems stemming from the diversity of stress factors acting on the related pipelines supply natural gas.

In this context, the authors analyse the behaviour of pipelines under the effect of the stresses to which they are subject by using finite element modelling.
Thermal comfort assessment for different heating system using CFD-modelling inside of an orthodox church
Authors: Ciocan V , Țurcanu E F , Verdeș M , Luciu R S , Bălan M C , Hudișteanu S V , Burlacu A
Published: September 2019

Thermal comfort is a general term that describes the sensation of warm or cold for the occupant, defining the state of mind of humans that expresses satisfaction. Because 90% of our time is spend inside the buildings is essential to achieve a good thermal comfort. In this paper we present two different heating system that are used in more than 90% of the church in our country. The article test two different heating system in order to evaluate the thermal comfort of the occupants and if the climate meet the requirements for the churches where the paints and the artworks must be kept in good condition for future generation.
Improved strategy for optimal control of Civil Engineering structures
Authors: Păuleț-Crăiniceanu F , Luca S G , Pastia C , Florea V
Published: September 2019

Inside the Industrial Revolution 4.0, the concepts as Smart Cities and Smart Society are important parts in protection of humans against natural disasters, as strong earthquakes. Older or newer protection strategies of Civil Engineering structures (bridges, buildings) must be updated with elements of the actual technological revolution as sensors, drones, robots, nanotechnologies, AI, big data, cloud computing and so on. This paper is focused on a optimal structural active control of buildings started by many researchers during the last decades. Now, the target is to improve an optimal strategy developed by authors by proposing a more efficient use of computation. The success of this strategy leads to a faster response of computers that direct the control devices. This provides the ground for a larger range of control devices based on a larger number of sensors and, therefore, a better energy use together with a more precise anti-seismic structural protection
Enhancing Civil Engineering teaching through 3D Computer Aided Design
Authors: Gonçalves J , Santos B
Published: September 2019

3D interpretation of 2D drawing is not easy for most of the Civil Engineering first-year students. Some do it naturally but most need to be trained to master this skill. In this paper, the implemented teaching methodologies aiming to facilitate the acquisition of three-dimensional project visualization skills are presented. These methodologies were developed during the last two years targeting first-year Civil Engineering students at the University of Beira Interior (Portugal). After a first contact with 2D project representation through manual drawing, students progressively elaborate computer-aided design (CAD) project starting with simple 2D drawings and culminating with a 3D project of a pre-existing building. Students are also motivated to improve their 3D graphic representation skills through a classroom contest where the winning project is printed in 3D. The training in 2D and 3D graphic representation is complemented during the second year with several in situ surveys and computer-aided drawing of topographic data. This approach proved to be very interesting for competence acquisition, qualifying students for a better 3D representation and interpretation. Students also found this methodology to be motivating.
Experimental research on behavior of axially circular CFRP steel tubular confined recycled aggregate concrete long columns
Authors: Zhang G W , Wang Z L , Liu D W
Published: September 2019

In order to reveal the mechanical properties of CFRP recycled aggregate concrete long columns under axial compression load, we designed 7 experimental members for the test. The specimens parameters are recycled coarse aggregate replacement percentage, slenderness ratio and layers of CFRP jackets. According to the test, the failure process and patterns were obtained, and the curve of load-displacement were measured. The influence of recycled coarse aggregate replacement ratio, slenderness ratio, layers of CFRP on the bearing performance of CFRP circular steel tubular confined recycled aggregate concrete long columns were analysed.
Research progress on bolting connection of prefabricated concrete shear wall
Authors: Xiao Tongliang , Sheng Jiacheng , Chen Yan , Chen Biyong
Published: September 2019

Dry connection of prefabricated concrete shear wall has gradually become a hot research direction in China, and among those various of dry connections, bolted joints attract scholars’ attentions with its unique advantages. This paper introduces the classifications of bolted joints of prefabricated concrete shear wall structures. Then it summarizes the latest developments of such joints in foreign countries, and the current research status in China. At the same time, this paper will give a comprehensive evaluation from the perspective of safety and cost. Finally, some suggestions are put forward for the problems still to be solved in this direction in the future.
Variations of Enzymatic Activity and Main Quality Components During the Fermentation Process of Acanthopanax senticosus Tea
Authors: Wu K W , Xu Q Y , Zhu L J , Yang L N , Ma T
Published: September 2019

Acanthopanax senticosus fresh leaf was used as the experimental material to produce tea, Eurotium cristatum was used to ferment the Acanthopanax sentieosus tea. The variations of main quality components and enzymatic activity were examined during the fermentation process. The results showed that tea polyphenols, amino acid, and soluble sugar were decreased from 16.36%, 4.33%, 1.96% to 5.42%, 1.34%, 0.88%. The theabrownin was increased from 14.0% to 16.61%, but theaflavins and thearubigins were increased and then decreased during the fermentation process of Acanthopanax sentieosus tea. In addition, cellulase, pectinase and protease had been there as the endogenous enzyme before generating microorganisms, while polyphenol oxidase were exogenous enzymes. The main quality components and enzymatic activity were changed obviously as the time was prolonged. The quality of Acanthopanax sentieosus tea was improved effectively, which provided theoretical basis for the production and application of fermented-tea of Acanthopanax senticosus.
Microwave activation of coal gangue for Al compound
Authors: Lan Xijie , Liu Shuhong , Jing Yuan
Published: September 2019

The coal gangue was activated by microwave. From the results of XRD and 27AlMAS NMR, we can speculate the reactions occurred and new species were generated during the microwave activation process. Effects on power grades of microwave oven, kinds of additives, time of microwave activation, temperatures of water bath and ratio of coal gangue to additives were investigated. Much higher extraction percent of Al (>50) has been obtained with KOH as additive, ratio of coal gangue to additive is 1:2, power of microwave oven is 595W and time of microwave activation is 20 min.
Recipe Optimization to Produce Functional Anti-Motion Sickness Compressed Biscuits
Authors: Luo Lei-Lei , Wu Jun , Cao Li-Li , Zhai Cheng-Gong , Wu Xue-Feng , Luo Min
Published: September 2019

Anti-motion sickness, especially the seasickness, as one of the most common seen symptoms in long-term journey, can affect the normal work and life of crew members seriously. The purpose of this study is to investigate the anti-seasickness, anti-fatigue and functional constipation improving effects of anti-motion sickness biscuits in mouse model. Behavioral experiments together with biochemical indicators of mice were investigated under different doses of compressed biscuits. Results of the study indicate that mice fed with compressed biscuits containing medium and high doses of the anti-motion sickness ingredient can significantly improve the learning, memory and swimming ability compared to the control group. Furthermore, glycogen, LA and LDH levels of the mice can be increased with decreased BUN and Passe levels under the treatment of anti-motion sickness compressed biscuits. The results suggest that the compressed biscuits have anti-seasickness and anti-fatigue effects. In addition, the impact of pear residue in the compressed biscuits on the functional constipation of mice was also discussed in this paper.
Fabrication and characterization of novel polyacrylate films with hindered phenol structures and fluorine groups
Authors: Lou Jingjie , Zhang Yingqiang , Zhao Peng , Xu Wei , Fan Sida , Wang Xinyu
Published: September 2019

A series of novel fluorinated-damping polyacrylate (OFDA) emulsions based on a series of novel hindered phenol fluorinated acrylates (OFIP-AO 1010-HEA) were prepared successfully. The structure of OFIP-AO 1010-HEA was characterized by fourier transform infrared spectroscopy (FTIR). The influence of OFIP-AO 1010-HEA on different properties of the OFDA films was investigated by using dynamic mechanical analysis (DMA) and the measurement of contact angle. The results showed that the OFDA6 film owns 0.75 in tan δpeak and its loss factors ≥ 0.3 was spanning widely from -80 °C to 200 °C. So the OFDA6 film had the best damping properties. While OFDA4 had the best in the contact angle of water and the lowest surface free energy.
The Effect of Calcium Leaching on the Chloride Diffusivity of Hydrated Tricalcium Silicate Pastes
Authors: Tao Guanghui , Liu Lin , Qin Gang , Xu Xiaquan
Published: September 2019

Calcium leaching of cement-based materials induces detrimental effects on diffusion properties related to long-term durability. This paper investigates the effect of calcium leaching on the chloride diffusivity of hydrated tricalcium silicate (C3S) pastes. Different concentrations of ammonium nitrate solutions were used to accelerate the calcium leaching of C3S pastes. The degree of alternation of C3S pastes was characterized by Ca/Si. The chloride diffusivity of the leached C3S pastes was obtained by the steady-state electro-migration test. Results show that the chloride diffusivity of the leached C3S pastes increases with the increasing degree of alteration. Compared with the sound C3S pastes, the diffusivity of the leached C3S pastes is increased 1.8-3.6 times depending on the degree of alteration.
Preparation and Properties of Needle-punched Woven Quartz Fiber Reinforced SiO2 Ceramic Matrix Composites
Authors: Su Tong , Luan Qiang , Wei Qihong , Wang Hongsheng , Liu Xiaojun , Shi Jiang , Gao Wenqiu , Shao Changtao , Wang Yuhong
Published: September 2019

The needle-punched woven silica fiber reinforced SiO2 ceramic matrix composites were prepared by liquid phase infiltration-in-situ solidification molding process. The prepared composites have high density and good uniformity, and the mechanical properties of the composites at room temperature. Microstructure, interfacial properties and dielectric properties at room temperature were investigated, and the strengthening and toughening mechanism of acupuncture-woven quartz fiber reinforced SiO2 ceramic matrix composites was discussed. The mechanical properties at room temperature show that the tensile strength, flexural strength, compressive strength and interlaminar shear strength of the composites reach 35.6MPa, 79.0MPa, 122.0MPa, 11.9MPa, respectively. Scanning electron microscopy (SEM) and energy spectrum of the fractures of the samples (EDS) observation and analysis showed that there was no interfacial reaction between the matrix and the fiber, and the interface was suitable. The main factors that improve the mechanical properties of composite materials at room temperature are crack steering, expansion barriers, and fiber pull-out. The dielectric properties of the composite at room temperature do not change or change much under different X, Ka, and Ku conditions. As the bulk density increases, the dielectric constant of the composite increases gradually, and the loss tangent is always maintained at 10-3 orders of magnitude.
Synthesis and Application of Hydrogenated Cardanol Polyoxyethylene Ether
Authors: Chen Feng , Chen Pengfei , Jiang Wenhe
Published: September 2019

Unsaturated cashew phenol polyoxyethylene ether (UCPE-11, UCPE-13) was synthesized from cashew phenol by ethylene oxide addition reaction, and then hydrogenation was catalyzed at room temperature and pressure to produce saturated cashew phenol polyoxyethylene ether nonionic surfactants (CPE-11, CPE-13). The effects of catalyst dosage and reaction time on catalytic hydrogenation reaction were investigated. The optimum conditions for catalytic hydrogenation reaction were determined as follows: Al-Ni alloy was selected as catalyst at 25 °C, the dosage of which was 18% and 27.8% of the mass of unsaturated cashew phenol polyoxyethylene ether, respectively, and the reaction time was 11 h and 12 h. The structure of the product was characterized by IR and 1H NMR. The synthetic product was used in AC aluminium cleaner. The results show that the product has excellent decontamination performance. The surface of the washed aluminum parts is clean and has a metallic luster, and the washing effect is good.
Preparation of dense ZIF-67 layer wrapping PPy nanotubes via assistance with triethylamine
Authors: Liu Xiu-Feng , Li Yong-Jian , Li Han-Sheng , Wu Qin
Published: September 2019

The high dispersity and conductivity of materials are of great significance in the field of energy conversion and storage. In this work, a highly dispersed ZIF-67 anchored onto polypyrrole nanotubes precursor with good crystalline is prepared via self-assembly through coordination between cobalt cation and 2-methylimidazole assisted with deprotonating agent of triethylamine. The as-synthesized precursor displays a dense coating layer wrapping high aspect ratio polypyrrole nanotubes as clearly observed by scanning electron microscope. This work provides a rational route in construction of hierarchical composites with high conductivity and outstanding catalytic property applied in electrocatalysis and energy storage device.
Effect of joint characteristics on surrounding rock stability and stress mechanism of bolt under blasting excavation
Authors: Liu Xue-Zeng , Lai Hao-Ran , Sang Yun-Long , Zhu Wen-Xuan
Published: September 2019

Joint characteristics of rock mass are the key factors of tunnel surrounding rock failure. This paper relies on the two-lane mountain tunnel project and takes the IV class surrounding rock as the research object. By means of on-site investigation, numerical simulation and on-site monitoring, the effects of different joint development characteristics under blasting vibration on tunnel surrounding rock deformation, instability mode and force mechanism of rock bolts are studied. It is found that the instability mode of tunnel is obviously affected by the larger joint dip angles. When the dip angle of one group of consecutive joints is kept unchanged and the dip angle of another group of joints is changed, the vault settlement decreases first and then increases with the increase of joint dip angles. The influence of horizontal joint spacing on surrounding rock deformation and vault settlement is much greater than that of vertical joint. Under the most disadvantageous working conditions of the two sets of consecutive joints, the effective range of the axial force of rock bolts depends on joint dip angles and has little correlation with joint spacing. The axial force of rock bolts decreases with the increase of horizontal joint spacing, while the influence of vertical joint spacing on bolt is less.
Application Research of Liquid Viscous Damper in Controllable Structure
Authors: Zheng Wei
Published: September 2019

The controllable structure assembling the additional liquid viscous damper shows good structural characteristics through theoretical analysis and the comparison with model test. Liquid viscous dampers can significantly change the basic dynamic characteristics of the structure and exhibit certain regularity. According to the research, the ability of the structure assembling damper to adjust itself is greater than the effect of same structure adding weight, which indicates that the liquid viscous damper plays a prominent role in controlling the structural response.
The Development of Manufacturing Technology of CVD Diamond Thick Film Tools
Authors: Shi Haohao , Chen Feng , Zhou Yidan
Published: September 2019

The key manufacturing technology of CVD diamond thick film tools is introduced, including thick film preparation, cutting, welding and edge polishing. The problems existing in manufacturing of CVD diamond thick film tools are analysed. The development trends of manufacturing technology of CVD diamond thick film tools are discussed.
Modeling, Simulation and Experimental study on Giant Magnetostrictive Pump-Hydraulic System
Authors: Zhao Yapeng , Zhang Xuyao , Lu Quanguo
Published: September 2019

In recent years, there have been growing attention for hydraulic actuators with smart materials. In this paper, a new type of giant magnetostrictive pump structure was designed and the experimental framework of giant magnetostrictive pump-hydraulic drive system was proposed. The dynamic model of giant magnetostrictive pump-hydraulic drive system was constructed. Thus, the output speed of output cylinder in this system under different preload was simulated and experimental study was carried out under the same conditions. The experimental results verified efficiency of the dynamic model to a large extent.
The Technology Research on Cutting Test of 4GXJ-I Tapping Knife for Rubber Tree
Authors: Huang Chang , Wang Lingling , Cao Jianhua , Zheng Yong , Wu Sihao
Published: September 2019

As the market continues slumps and an aging rubber-cutting contingent, rubber-cutting labor shortage has become one of the bottlenecks restricting the development of caoutchouc industry. The mechanical and intelligent cutting method becomes the development direction in rubber-cutting industy. This study choses type 4GXJ-1 of portable cordless brushless tapping knife to take rubber-cutting experiment in accordance with appropriate rubber-cutting procedures. The results show that the bark cutting technology can research millimeter in precision control, and the rubber-cutting average time can achieve the projected objective. The results have been validated by the test, and it can provide the references for the other similar design. The type 4GXJ-1 of portable cordless brushless tapping knife is practical and worthy of wide application.
Iterated Local Search Algorithm for single and double runway aircraft scheduling problems in Terminal Area
Authors: Xu Hongyun , OuYang Quan
Published: September 2019

We present an Iterated Local Search (ILS) algorithm for solving the single and double runway aircraft scheduling problems in terminal area. The main ideas and implementation methods of each step are described in detail. Applying the ILS algorithm to solve the instance used in the literature and compare the results of ILS with those of previous 4 algorithms. For the single runway problem, the ILS can find the previous best known result. For the double runway problem, the ILS can find a result better than the previous best known result.
Crawling Gait Planning and Simulation Analysis of Closed-chain Walking Leg Robot
Authors: Wang Yongming , Wei Qiang , Ma Tengfei
Published: September 2019

This paper presents a new type of closed-chain walking leg mechanism, which can swing through a crank-rocker mechanism, and a crank-slider mechanism to achieve leg extension. On this basis, a quadruped robot is constructed, the crawling gait planning is carried out, and the leg swinging time sequence of the robot crawling is given. Based on ADAMS simulation software, the virtual prototype model of quadruped robot is established, and the relative simulation parameters are set up to simulate the robot motion. The displacement curve and velocity curve of the body centroid and foot end of the quadruped robot are obtained. The simulation results show that the quadruped robot can walk stably in the crawling gait.
Study of the property of High Viscosity Asphalt Used in Permeable Friction Course
Authors: Zhu Siyue , Qin Xiantao
Published: September 2019

In order to evaluate the property of self-modified high viscosity asphalt (SHVA), we use GC SBS modified asphalt (GC)and TPS high viscosity asphalt (TPS) as control group. The rolling thin film oven test (RTFOT) and pressure aging vessel (PAV) were adopted to evaluate the aging property of high viscosity asphalts. And the storage stability of SHVA was measured. The results show that after RTFOT, the ductility, zero shear viscosity, viscosity toughness and toughness of SHVA are better than those of GC and TPS. The Zero shear viscosity of SHVA can still reach 19638Pa·s after PAV. Therefore, the anti-aging performance of SHVA is better than GC and TPS. After heat storage for 72h, the softening point difference of SHVA is 2.3 °C which can meet the storage stability requirement.
Metal-doped carbon aerogel from sodium alginate for supercapacitor
Authors: Zhai Zuozhao , Ren Bin , Xu Yuelong , Liu Zhenfa
Published: September 2019

In this paper, different metal-doped carbon aerogels are prepared by one-step carbonization with sodium alginate as raw material. It was known by SEM and TEM that the metal was uniformly dispersed into the carbon aerogels. Cr-doped carbon aerogel has a rich pore structure with a specific surface area of up to 497.4 m2 g-1. The prepared samples were used in the field of supercapacitors, and the test results showed that the Cr-doped carbon aerogel has the highest specific capacitance (312.5 F g-1).This study not only develops new directions for the utilization of marine biomass resources, but also provides a simple method for preparing metal-doped carbon material.
Research on Moment of Inertia Measurement Method
Authors: Wang Yafei
Published: September 2019

A method for measuring the moment of inertia has been proposed. The dynamic model of stator current and load moment of inertia during the motor’s frequency speed control has been built. Research show that load moment of inertia and the max of stator current are submitting linear relationship, which means that moment of inertia can been calculated after the stator current during the motor’s frequency speed control has been measured. Finally, the linear relationship between the moment of inertia and the stator current has been proved with a series of experiment, therefore, the feasibility of the method has been validated. The method has a better repeatability while the repeatability error is 3%.However, by recalculating the experiment data with the math model, the result indicate that the maximum error is 39%.The main factors of the error are math model building error and the instrument uncertainty. In order to improve the precision of the moment of inertia measurement, research should be taken to build a more exact math model.
Simulation method of milling vibration based on cutting force segmentation model and Simulink
Authors: Li Hua , Du Weijie , Han Jianxin
Published: September 2019

Modeling and Simulation of vibration of cutting process is the main way to control milling chatter. In this paper, an integral model of cutting force for milling process with helical cutter considering the sectional characteristics of cutting force is established. Based on the model, the dynamic analysis module of thin-walled milling process including the judgment module, signal module and definite integration module is built by using Simulink of MATLAB, which. The module can realize fast simulation in different cutting parameters and tool geometry conditions. This research can provide important reference for simulation analysis of cutting process.
The threshold determination methods of water body information extraction using GF-1 satellite image
Authors: Ji R P , Yu W Y , Feng R , Wu J W , Zhang Y S
Published: September 2019

The GF-1 satellite is the first satellite of China High-resolution Earth Observation System (referred to short as CHEOS) with the advantages of high spatial resolution, high temporal resolution and 4 multi-spectral channels, which can quickly extract inland water body information. At present, the methods of water body information extraction by remote sensing mainly include single-band threshold method, spectral relation method, normalized difference vegetation index (NDVI) method, normalized difference water body index (NDWI) method and shade water body index (SWI) method. The results of water body information extraction will vary with different methods; especially, the thresholds determination of each method is an important factor in the accuracy of water body information extraction. In this paper, the water body information of Qinghai Lake, Hongze Lake, and Hulun Lake were extracted by NDWI index, and the optimal thresholds of water body information extraction were determined by using Jeffries-Matusita (J-M) distance method and density slice method was in the range of -0.061~0.093. Finally, the accuracy of the extraction results was analyzed, and the overall accuracy is more than 88%.
Application and Analysis of water ring vacuum pumps reform Based on Characteristic Curve
Authors: Feng Qiang Sheng , Chen Li Feng , Wang Xiao Huan , Le Yuan Nan , Zheng Jie
Published: September 2019

The operating efficiency of a vacuum pump is closely related to the characteristic curve and affected by the sealing water temperature of the vacuum pump. Tests have been put on the vacuum pump based on the analysis of the characteristic curve, and the circulating water system is reformed to control the temperature of the sealing water. The energy consumption of the equipment decreases, the operation stability improves, and the cost of the equipment is reduced. Furthermore, the benefits brought by the adjustment are verified through data analysis.
Engineering prevention and treatment of salt soil diseases caused by pulping on low-grade highways in xinjiang
Authors: Zheng Yu-Xin , Li Chun-Yan
Published: September 2019

The frost boiling disease caused by saline soil is a common disease of grade three and four highways at present. In this paper, the mechanism of frost boiling highway disease in saline soil is analyzed. And through simplified calculation combined with engineering experience, the concrete measures for preventing and curing the disease are put forward. Finally, through engineering practice verification, the expected results have been achieved.
The study on concession pricing mechanism of traditional village conservation projects based on PPP mode
Authors: Fang Jun , Chen Fei , Gong Jingyuan
Published: September 2019

Even though the introduction of PPP mode to the traditional village protection programs can make the private capital living and ease the government’s fiscal pressure, the direct contradiction between the interests of traditional village is an important factor influencing the successful implementation of the projects. The research on concession pricing mechanism of traditional village projects based on PPP mode aims to deal with the design of reasonable incentive mechanism and the establishment of the government compensation system, and coordinate the relationship among multiple stakeholders in PPP mode to ensure the smooth development of traditional village protection programs. Based on the above analysis, a model of traditional village protection PPP mode by the Multi-objective Planning could be built and according to the interests of participating subjects, the constraint conditions and priority ranking could be set. In the end of this paper, the solution of the franchising price interval was calculated by empirical analysis.
Research on the construction of village classification evaluation index system under the background of rural revitalization
Authors: Chen Haiting , Wang Zhiyuan
Published: September 2019

The Rural Revitalization Strategic Plan (2018-2022) clearly divides the villages into agglomeration and upgrading villages, characteristic protection villages, evacuation and relocation villages and suburban fusion villages. However, the current classification of villages is subjective and lacks scientific and rational quantitative evaluation. This paper attempts to construct the villages classification evaluation index system from six aspects, namely transportation location, population scale, land resources, economic development status, infrastructure and historical context by using AHP. Through an empirical research of 12 villages in Mayangshan township, Longhui county, it was found that there were 2 agglomeration and upgrading villages, 4 characteristic protection villages and 6 evacuation and relocation villages in Matangshan township. In the background of rural revitalization, the construction of village classification evaluation index system to scientifically determine the type of village is a useful exploration for improving the theory and practice of rural planning, which can provide reference for village layout planning.
Research on the factors affecting the choice of private capital in PPP projects of urban underground comprehensive pipe gallery
Authors: Gong Jingyuan
Published: September 2019

In the practice of PPP projects, many projects failed due to the inability of private capital to meet the objectives of construction and operation. Therefore, choosing the right private capital is the prerequisite for the success of the PPP project. This paper takes the urban underground comprehensive pipe gallery PPP project as the research object, and proposes five factors that affect the choice of private capital. Through the structural equation model (SEM), the structural model of the influencing factors of private capital selection is constructed, and the influence of each variable on private capital choice and the interaction between variables are analysed. According to the calculation results of the model, corresponding suggestions are put forward, which aims to save time and effort in the process of purchasing social capital, so as to achieve a win-win situation for both government and private capital.
Combination of the Chinese and Tibetan Architectural Languages——a Case Study of three Halls of Wusutuzhao in Inner Mongolia
Authors: Tuo Ya , Zhou Bo , Shang Dawei
Published: September 2019

In order to study the architectural style of Mongolian lamaist temple combining the han and Tibetan styles, this paper analyzes three main halls of the temple built in different periods in the same village.Secondly, the process of deformation and combination of spatial prototype is decomposed through illustration. The following conclusions are drawn: 1. The temple architecture of lamaism in Inner Mongolia flexibly utilizes the architectural vocabulary of the two language families on the premise of satisfying the architectural function and accurately expressing the religious connotation; 2.2. The two architectural languages use different spatial dominant principles to express similar spatial connotations and reflect the basic cognition of buddhist cosmology;3. With the improvement of the craftsman’s ability to master the two languages, the ways of integration of the two languages are always changing, and the manifestations of the palace are diversified.
Three-dimensional centrifuge modelling of the effects of tunnelling on vertical behaviour of pile group
Authors: Chen S. M. , Lu H. , Jiang H. J. , Peng S. Y. , Wong K. S.
Published: September 2019

In densely built urban cities, tunnels are likely to be constructed adjacent to existing deep foundations. Tunnelling activity inevitably induces soil stress changes and soil movements in the ground, which may affect nearby existing pile foundation. Although a number of studies have been carried out by various researchers to investigate tunnelling effects on piles, the three-dimensional effects of tunnelling on pile group have not been well-investigated and understood. In this paper, a three-dimensional centrifuge test was carried out to investigate the effects of tunnel construction on a pile group in dry sand. The diameter of each pile was designed as 0.8m (in prototype) and the diameter (D) of the simulated tunnel is 6.08m. Tunnel advancement was modelled in-flight by controlling a volume loss of 1.3%. The tunnelling process was divided into four stages to model the three-dimensional tunnelling effects. The closest distance between the tunnel and the pile group was 1.5m at the pile toe. Measured settlement of pile group, as well as axial force distribution of piles in the pile group are reported and discussed.
Damage location diagnosis of urban rail transit bridge based on vehicle-induced vibration responses
Authors: Liu Hao , Zuo Dongliang , Zhang Kun
Published: September 2019

For the urban rail transit bridges, vehicle load has obvious repeatability and regularity, and the vibration amplitude of the bridges under the vehicle action is much larger than that during the period of not being open to traffic, which is more conducive to the appearance of structural damage. This paper attempts to use vehicle-induced vibration responses to diagnose damages for urban rail transit bridges. Firstly, the vehicle-rail-bridge coupling finite element model was established based on the engineering background of a typical urban rail transit bridge. Then, through dynamic time history analysis, the vibration responses of bridge and vehicle before and after damage were obtained. Finally, the sensitivity to damage of acceleration responses from measuring points on both bridge and vehicle was compared, and a damage diagnosis method based on the difference of acceleration responses from different measuring points of bridge and vehicle structure was proposed. The results show that the difference of acceleration response between the measured points of bridge, wheelset and bogie before and after damage can be used to locate damage, and the vehicle-induced vibration data as a medium can provide a new way for rapid diagnosis of damage location for urban rail transit bridges.
Analysis of influence of adjacent side length of deep foundation pit on pit angle effect
Authors: Gao Xing , Wang Weiyu
Published: September 2019

As a three-dimensional system with length, width and depth, the foundation pit is bound to have a pit angle effect. At present, the study of the foundation pit angle effect focuses on the influence of the “deep” of the foundation pit, while ignoring the analysis of the “wide”. In this paper, the relationship between the length of the adjacent edge of the foundation pit and the foundation pit angle effect is analyzed by using the flac3d finite difference software. It is found that the ratio of the adjacent length to the depth does not change the functional relationship between the influence coefficient of the foundation pit angle effect and the ratio of the foundation pit angle distance to the foundation pit edge length. When the ratio of the length of the adjacent side to the depth of the foundation pit is less than or equal to 7, the influence coefficient of the foundation pit angle effect increases linearly with the ratio of the length of the adjacent side to the depth of the foundation pit. When the ratio of the length of the adjacent side to the depth of the foundation pit is more than 7, the influence coefficient of the foundation pit angle effect is a fixed constant. Finally, the rationality of the research results is verified by engineering examples.
Heat Analysis of Assembled Steel-truss Concrete Hollow Floor
Authors: Ju Hao-Xue , Zhang Yue , Xing Xu-Dong
Published: September 2019

The numerical analysis software ABAQUS has been used to study the temperature field of an assembled steel-truss concrete hollow floor in this paper to simulate the assembled steel-truss concrete hollow floor under thermal coupling under the ISO-834 standard heating curve. The distribution principle of temperature field for different sections in the floor system has been obtained to provide a reference for the study of the mechanical properties of assembled steel-truss concrete hollow floor.
Interpretation of the coseismic surface deformation of Wenchuan earthquake based on the theory of disclination and dislocation
Authors: Duan Hu-Rong , Yan Quan-Chao , Wu Shao-Yu , Kang Ming-Zhe
Published: September 2019

A combination model of disclination-dislocation which can describe the three-dimensional translational and rotational motion of the fault is given. We used the combined model and the dislocation model to calculate the coseismic horizontal displacement of 102 points of Wenchuan earthquake respectively. The result indicates that the horizontal displacements calculated by the two models are generally in agreement with the GPS observations both in magnitude and direction, but there are some differences in some points. When the magnitudes of horizontal displacements by the two models are close to each other, we calculate their direction residuals by taking the direction of the GPS observations as the true value. It is found that the directions residuals calculated by the two models are concentrated between [-20°, 20°], and the number of points accounts for 84.3% of the total in this interval. In the interval where the direction residuals is smaller, the percentage of the number of the points calculated by the combined model is greater than that calculated by the dislocation model, indicating that the combined model can better explain the surface deformation observation.
Dual-beam laser welding and seam accurately tracking control for 3D T-joint
Authors: Gong Shihua , Wang Ziyue , Ma Xiuquan , Yang Jianzhong , Wang Pingjiang
Published: September 2019

The processing methods and quality of T-joint directly affect the performance of stiffened panels. In this paper, firstly, a ten-six axis dual-beam laser welding system is constituted to research the T-joint welding process. Then, the ten-six axis controller in laser welding system is designed to achieve the accurate controlling for position and attitude of welding head during 3D welding of T-joint. In addition, the real-time measurement on both sides of T-joint is adopted to enable deformation compensation and precise tracking for welding seam. Finally, the T-joint welding tests are carried out and the results show that the welding seam errors are within allowable range. Consequently, the dual-beam laser welding and seam tracking control technology presented in this study can meet the processing requirements for T-joint.
Laser Cutting Machine Tool Monitoring and Assistance System Based on Internet of Things and Cloud Service
Authors: Bu Xiang-Li , Li Guan , Li Xiao-Ping , Li Pan
Published: September 2019

With the development of computer technology and the increasing application of Internet of Things technology, traditional monitoring and assistance system for laser cutting machine tools can no longer meet the needs of Intelligent Manufacturing in modern enterprises. We proposed a remote monitoring and assistance system based on Internet of Things and cloud services for the laser cutting machine tools. STM32 chip is selected for field data acquisition and ESP32 chip is selected for the WIFI gateway. Cloud monitoring system is implemented IoT on platform and Elastic Computer Service. Monitoring and interaction software is developed in mobile phones and local PC. Laboratory tests show that the system is feasible for the improvement of production and maintenance efficiency of laser cutting machine and provide a low-cost remote diagnosis and maintenance system for laser processing enterprises and laser cutting machine tool manufacturers.
New Intelligent Logistics Mode Based on Intelligent Express Box
Authors: He Hui , Wang Ai-Lin , Xiao Peng-Yang , Zhao Shu-Lin , Liao Si-Rui
Published: September 2019

The Internet of things is the product of the information waving in the new era. It rapid development has been widely used in daily life. This paper introduces an automated, digital intelligent logistics model. It introduces intelligent equipment in the entire logistics chain, and utilizes big data analysis and integrated warehouse system management mode to reduce personnel costs to improve link efficiency resource scheduling. Under the invisible push of the market, whether the intelligent logistics can be popularized comprehensively has become the key that restricting the development of the logistics industry in the future.