bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis on Ubiquitous Power Internet of Things Based on Environmental Protection
Authors: Jin Huawei , Liu Xianjun , Liu Weiwei , Xu Jing , Li Weiping , Zhang Hao , Zhou Jie , Zhou Yuheng
Published: August 2019

With the comprehensive acceleration of the construction of ubiquitous power Internet of Things by power companies, the construction of power Internet of Things can improve the depth and breadth of information monitoring in all aspects of the power system, monitor and control the operating parameters of important equipment in all aspects, and improve the power system. The monitoring, analysis and prevention capabilities; sensors are the most critical link to the in-depth mastery of information in all aspects of the power of the Internet of Things. As one of the important components of the country, the power company plays a fundamental role in supporting the development of the entire national economy. As power companies continue to develop, they also bring a series of environmental problems. The use of sensor monitoring terminals has become a key issue restricting the development of power Internet of Things. How to build an environment-friendly environment based on environmental protection. The power Internet of Things can improve the safe operation level of the power grid and achieve good economic and social benefits.
Comparison on CHP Thermo-electric Decoupling Technologies with Heat Pump and Low Pressure Renovation
Authors: Zhang Li , Zhijun E , Hu Qingbo , Guan Sensen , Du Yan , Fang Jiuwen , Wang Kun , Yang Bangyu , Li Zhenbin , Zhang Yu
Published: August 2019

Thermo-electric decoupling is an effective way to improve the adoption capacity of renewable power of power grids. Therefore, theoretical analysis models are established in this study to evaluate the decoupling performance of CHP with absorption heat pump, compression heat pump and low-pressure turbine renovation. Results show that absorption heat pump, compression heat pump and low pressure cylinder can all expand the feasible operation area and reduce the minimum electricity load rate of the reference CHP plant. When the heat load is 250 MW, The minimal electricity load rate of unit decreases by 12.98%, 56.47% and 36.34% with absorption heat pump, compression heat pump and low-pressure turbine renovation, respectively. The maximal heat-to-electricity ratio of unit is also increased by integration with heat pump and low-pressure renovation. Besides, the compression heat pump has the best decoupling performance among these three decoupling technologies under the same max heating power.
Analysis on 500 Kv Transmission Tower Influence Factors Based on Optimum Slope
Authors: Chen Hao , Fang Qing , Zhang Chuanyi , Liu Tianci
Published: August 2019

In the design of 500 kV heavy ice area transmission tower, reasonable selection of tower slope can effectively reduce the cost of the project. Taking the type of 53ZBC33 tower, which is in a 20mm ice area 500 kV transmission line, as an example, a comprehensive calculation of 8 different slopes, which range from 0.09 to 0.16, in 60m, 54m, 48m and 42m body-high transmission towers is carried out. A total of 32 models are established. The construction of the tower is based on steel consumption cost, foundation cost and compensation for the occupied land of the tower foundation. From the price comparison analysis, the optimal gradient of transmission tower varies slightly when the body-high of the tower is different, but the overall optimal slope fluctuates in the range of 0.10 to 0.13. In the design project, the optimal slope of the tower can be quickly calculated by the range of 0.10-0.13.
Study on Principle Design and Hydrodynamic Performance of Swing River Kinetic Energy Generation Device with Parameters
Authors: Bo Pang
Published: August 2019

From the perspective of energy security, the development of renewable energy can solve the shortage of energy resources. From the perspective of environmental protection, the development and utilization of renewable energy can improve the deteriorating ecological environment in China. The equipment of river kinetic energy generation is different from that of conventional large and medium-sized high dam hydropower stations because of the different energy conversion modes. Due to the great differences in river conditions, the development of wave energy in China can not directly apply the successful experience of foreign countries. The mathematical model of motion simulation is based on the simulation of mechanism system. It can truly reflect the motion performance and energy utilization of a given mechanism to a certain extent. In this paper, the mathematical model of the motion simulation of the tank test model is established by analyzing the motion of the blade hydrodynamics and the pendulum energy conversion device. The device capture power obtained by experiments is compared with the device capture power obtained by the frequency domain numerical model, which verifies the rationality of the experimental arrangement and the reliability of the experimental data.
Characteristics of melanic epipedon based on biosequence in the physiography of Marapi - Singgalang, West Sumatra
Authors: Hermon Dedi , Ganefri  , Putra Aprizon , Oktorie Olivia
Published: August 2019

This research aim to express descriptively melanic epipedon based on biosequence middle bevel physiography of Marapi-Singgalang mount representing Upper watershed area from Batang Anai watershed. The sample determined by Stratified Random Sampling at each biosequence. From result of research obtained by difference of melanic epipedon of Marapi mount characteristic with melanic epipedon of Singgalang mount characteristic, so that for the farm in the middle bevel of Singgalang need the existence of land conservation action, passing reboisasi program, utilize to improve again land that function as buffer zone in Batang Anai watershed.
Science and technology for the Alert Group Disaster “Tumik Singgalang” East Malalak Nagari, Malalak District, Agam Regency, West Sumatra
Authors: Ansosry  , Barlian Eri , Syah Nurhasan , Razak Abdul
Published: August 2019

In the implementation of devotion in Jorong Saskand obtained a commitment on the part of districts, villages and ellipse as a service area. The commitment is obtained based on some identification problems faced by people who are important to be solved collectively. Society needs an explanation in terms of the academic science related to the potential danger to human settlements that are prone to landslides. The survey was conducted using a test to determine the type of layer geoelectric lithology / rock. Based on the results of the interpretation of electrical resistivity tomography. Wenner configuration showed layers of clay and pumice tuff at this track. Scientific analysis is translated in simple language to convey to the public. The solution to the problems facing society is the improvement of information systems at the community level while considering the potential and local wisdom. Public understanding of scientific terms that are directly involved in the technical processes related to geological conditions in disaster areas and this becomes the basis for an early warning system to collect and effective mitigation mechanisms to do. Improvement of early warning information system for landslides that involve elements that exist in society. To strengthen the information system related to early warning, then the required agreement among participants so that generated Mechanism of Landslide Mitigation Participative Approach. This method is outlined in the form of Standard Operating Procedures (SOP) early warning system for landslides Jorong Saskand, East Malalak, Agam Regency.
Implementation strategy character building of care and environmental culture in school
Authors: Teguh Prihartono Agus , Azhar Aulia , Danhas Yunhendri , Rusdinal  , Syah Nurhasan
Published: August 2019

Adiwiyata program has been launched in schools. The character building in schools, especially the caring and cultured environment is deemed necessary to be studied, because considering the broad and long-term impact on environmental conditions between generations. To this day, related to the environmental attitudes and culture. The point is to form caring and cultured characters for school citizens through the education system implemented in the education level unit. Therefore, it needs to be measured to what extent the implementation is running and how the improvement strategy is going forward. The number of schools that become the Adiwiyata School, in Padang Town are reaching 243, out of 646 totality of schools. To increase the number of adiwiyata schools in the Padang Town to the future, an improvement strategy is needed based on current conditions. The current condition in question is all the strengths, weaknesses and opportunities and threats that exist. This research is classified as qualitative research. The aim is to increase participation of school into Adiwiyata Program in Padang Town. The method used tin this research is SWOT analysis (strengths weaks threats opportunities). The results of the research, the strategy direction is obtained in the form of growth with the main strategy in the form of SO Strategy (Strenghts - Opportunities), namely “utilizing the power to seize the opportunities that exist”, or “increasing the opportunities for existing strengths”. The derivatives of this main strategy are 10 (ten) priority strategies.
Progress in polystyrene microspheres
Authors: Piaopiao Wang , Zihui Meng
Published: August 2019

The preparation methods of polystyrene (PS) microspheres were reviewed, and the effects of monomer, dispersant, initiator, reaction medium and temperature on the particle size and size distribution of PS microspheres were discussed. Finally, the application prospect of polystyrene microspheres was prospected.
Research Progress of High Temperature Filter Materials in Bag-hose Precipitation
Authors: Xiangai Zhang , Yuwen LIU , Wei JI
Published: August 2019

Bag-hose precipitation for its efficient, reliable, low energy consumption and simple maintenance has been widely recognized in various industries. The application of bag-hose precipitation in more than twenty fields presents rapid development trend, such as electric power, cement, steel, non-ferrous metals, machinery, chemical industry and municipal. The research status of bag-hose precipitation technology is reviewed. The application situation and developing trend in the electric power, cement, waste incineration and steel are summarized. The developing direction of high temperature filter materials in bag-hose precipitation is anticipated.
Electronic distribution and elastic properties of zinc-blende AlN and GaN
Authors: Wang Huanyou , Jin Gui , Tan Qiaolai
Published: August 2019

The density-functional theory (DFT) and density-functional perturbation theory (DFPT) are employed to study the electronic distributions and elastic properties of zinc-blende AlN and GaN. The linear charge density distributions along the [111] direction and charge density distribution of (001) planes for zinc-blende AlN and GaN are calculated. The total state of density and partial state of density of AlN and GaN are also calculated. Based on the optimized lattice parameters, the elastic constants and the internal strain parameters of zinc-blende AlN and GaN are calculated. The elastic tensors and compliance tensors are used to calculate Young’s modulus of (101) planes.
Intelligent optimization design of specimen on sheet materials for Split Hopkinson Tensile Bar tests
Authors: Wang Qinghua , Xu Feng , Xing Liangliang , Huang Dedong , Wu Bin
Published: August 2019

The Split Hopkinson Tensile Bar (SHTB) is one of the most widely used methods to study the high strain rate behavior of materials. For these experiments usually dogbone-shaped sheet specimens are used. However, there’s no agreement on the exact dimensions. In the present study, mechanism of the influence of specimen responses on accuracy of SHTB experiments was investigated with finite element program ABAQUS (Explicit). Indicators which can evaluate the measurement accuracy of specimens are proposed based on this. Orthogonal test is designed to establish the sample database for back-propagation (BP) neural network, which is adopted to fit the non-linear mapping from structure parameters to accuracy indicators of specimen. Optimal design of structure for sheet specimen is obtained with Genetic Algorithm (GA) according to the fitness of individual determined by trained and qualified BP neural network. At last, numerical simulations are adopted to verify the validity of the optimal structure for sheet specimen. The result of this study can provide recommendations for specimen design and data reliability analysis in Split Hopkinson Tensile experiments.
Study on Electrochemical and electrical discharge compound Micro-machining for Silicon
Authors: Chen Hui , Shi Lei
Published: August 2019

Silicon material is a widely used substrate in micro-electromechanical systems, and its micro-fabrication technology has always been a research hotspot. The main microfabrication methods of silicon material are chemical etching, electrochemical machining (ECM) and electrical discharge machining (EDM). The electrochemical and electrical discharge compound machining technology is a kind of machining method for non-conductive materials. In this paper, the compound machining technology was studied and applied to the microfabrication of silicon material. The machining principle of silicon material in hydrochloric acid solution was studied, and the influence of silicon material type and voltage on the machining was analyzed. It is found that n-type silicon can be machined, while p-type silicon can hardly be machined. With this technology, micro three-dimensional structures can be fabricated on silicon material.
Techniques used to improve the tribological performance of the piston ring-cylinder liner contact
Authors: Elagouz Ahmed , Ahmed Ali Mohamed Kamal , Xianjun Hou , Abdelkareem Mohamed A. A.
Published: August 2019

The mechanical assemblies in automotive engines are usually lubricated by a combination of oil and solid lubrication films. Consequently, the significant current challenges for developing the tribological behavior of vehicle engines need the lubricants that conform to different operating conditions by providing mechanisms for reducing friction and wear. This article summarily reviews the techniques used to improve the tribological performance for piston ring-cylinder liner contact and evaluates their effectiveness to provide the most assuring approaches to reduce friction and wear. The objective was to explore the areas where there are openings for further research contributions to achieving an improvement in the piston ring-cylinder contact in automotive engines.
Effect of Dispersion of Nano-inorganic Particles on the Properties of Polymer Nanocomposites
Authors: Liu Ting , Zhong Jihui
Published: August 2019

Nanocomposites refer to materials with at least one one-dimensional dimension within 100nm of the dispersed phase of the composite. Nanomaterials have a large phase interface area, which have many new physical and chemical properties that macroscopic objects do not have. The research on dispersing nano-particles in polymer to improve the properties of polymer materials was introduced in this paper, and the influencing factors of dispersing effect of nano-particles in polymer were studied from the aspects of surface treatment agent and mechanical processing technology and so on.
Study on 3D printing process of continuous carbon fiber reinforced shape memory polymer composites
Authors: Shen Xinxin , Jia Baoxian , Zhao Hanxing , Yang Xing , Liu Zhengxian
Published: August 2019

In this paper, shape memory polymer (SMP) and continuous carbon fibers (CCF) were utilized as raw materials to manufacture composites by means of 3D printing based on FDM. Various process parameters were systematically studied by the orthogonal experiment to find out the optimal process combination where interfaces and mechanical properties of printed composites specimens were treated as research objectives. The influence of each factor on the performance of the specimen was discussed. The results indicated that the mechanical properties were preferable when the printing temperature was 200°C, the printing speed was 4.5mm/s, the scanning pitch was 1.1 mm, and the ply stacking sequence was 0°. Furthermore, the fiber content had little effect on the shape memory performance of the polymer matrix. The rapid manufacture of shape memory carbon fiber composites has potential use in the field of aerospace.
Study on Charging Performance of Solar Panels Auxiliary Batteries for Hainan Electric Bus
Authors: Bai Youjun , Zheng Yan , Liu Shihao
Published: August 2019

Under the background of building free trade pilot area in Hainan Province to promote clean energy vehicles in an all-round way, this paper explores adding solar panel auxiliary batteries to electric buses with subtropical climate characteristics. Based on the solar energy resources of Haikou City, the experimental vehicles and parameters are selected, and the average daily power generation of solar panels is studied. The endurance mileage can be increased under full load air conditioning conditions. The results show that the installation of solar panels for battery auxiliary charging in electric buses has certain energy-saving and environmental benefits, but combined with the current operation of Hainan electric buses, the promotion and use of electric buses has no prospects for development.
Effect of Laser Processing Parameters on Surface Texture of Ti6Al4V Alloy
Authors: Xi Xiaoying , Pan Yongzhi , Wang Pengcheng , Fu Xiuli
Published: August 2019

Surface micro-machining was performed on Ti6Al4V alloy sample by nanosecond laser. The micro-morphology, the depth of texture and the chemical composition of melt deposits were analyzed through different techniques including Ultra-Depth Microscopy, SEM and EDS. The single factor method was applied to investigate the influence of different laser parameters on the depth of texture and micro-morphology. The result showed that the depth of texture increased first and decreased with the increase of average power (11-20.9W), the texture depth decreases sharply when the scanning speed increased from 10mm/s to 40mm/s, and the repetition frequency had little effect on the depth of texture. It was possible to select an optimum combination of laser processing parameters that obtain different depths of texture without decreasing the surface quality of texture.
Effect of controlled rolling and cooling process on microstructure and properties of X65 pipeline steel
Authors: Zhang Hai , Li Shaopo , Hao Ning , Li Zhangjun
Published: August 2019

Effect of rolling and cooling process on microstructure and properties of X65 pipeline steel was studied by means of tensile test at room temperature, oscilloscopic impact test and metallographic microscope. And the impact fracture process of samples with different microstructures was analyzed by oscillographic impact curve. The results indicate that controlled cooling process has important influence on the microstructure of the sample. The strength and toughness of sample with acicular ferrite microstructure are better than this with ferrite and pearlite microstructure. The crack initiation energy of the acicular ferrite microstructure is similar to that of ferrite and pearlite microstructure. However the crack propagation energy of the acicular ferrite microstructure is different from that of ferrite and pearlite microstructure.
1.99 micron Tm:YAP acousto-optical Q-switch laser
Authors: Wen Ya , Zhang Hongliang , Zhang Lin , Li Shuo , Wu Chunting , Jin Guangyong
Published: August 2019

Report the acousto-optical Q-switched operation of double ended pump big energy Tm:YAP laser.Tm:YAP crystal was a-cut, the dimensionas were 3mm×3mm×15mm and doped was 3at%. The laser diode center wavelength of 795nm. When the pump power was 79.2W, the repeat frequency was 1 kHz, a 1.99 μm wavelength laser output of up to 16.36 mJ was obtained, the narrowest pulse width of 38.04 ns, the peak power of 430.07 kW. The slope efficiency was 29.42%, light and light conversion efficiency was 20.66%. When the Q-switched average power was 15W, the beam quality factor of M2 was estimated of 3.19 in x-direction and 3.29 in y-direction
Research on the Comparisons between Sabah Cycle and Diesel Cycle of Common Rail Injection Diesel Engine
Authors: Liu Feng
Published: August 2019

Pressure constant pre-expansion ratio has directly influenced on the highest temperature of Diesel cycle. The common rail injection system also has directly influenced on the highest temperature and pre-expansion ratio, thereby it also affects the technical indices, such as thermal efficiency and average valid pressure. Taking National VI emission standard diesel from Weicai Company as an instance, the highest temperature and other technical indices of Sabah cycle with a common rail injection system and Diesel cycle without a common rail injection system were compared.
Motion Simulator System for Rendezvous and Docking Based on RTX
Authors: Liu Hao , Gong Dezhu , Fu Tongling , He Huadong , Li Bo
Published: August 2019

Motion simulator system for rendezvous and docking needs high precision and high real-time capacity. The main structure, crucial indexes and control system structure are introduced at first. Software demand is also analyzed, software is modular designed, makes use of fine interface of Windows, use real-time processing ability of RTX and high precision of control algorithm. The experimental results show that the motion simulator system for rendezvous and docking based on RTX have the high precision and dynamic real-time capacity, which can satisfies the demand of application.
Establishment and verification of longitudinal aerodynamic model of tandem wing aircraft
Authors: Wang Ziyi , Xiong Jing , Cheng Xiaoxue , Li Jie
Published: August 2019

This paper clarified the contribution of front wing and rear wing to the longitudinal aerodynamic derivative by analyzing the characteristics of tandem wing aircraft. By combining the structure and aerodynamic simulation data of the aircraft, the aerodynamic derivative can be directly solved through simplification of force without introducing the tail capacity Vh, and the longitudinal short-period (control) transfer function of the tandem wing aircraft can be obtained by substituting the aerodynamic model which is composed by aerodynamic derivative into the short period motion equation. This transfer function can be used to build the control system in Simulink. When the input signal is the same, the short-period response of the system has high goodness of fit with the value measured in flight test. Therefore, the longitudinal aerodynamic model of the aircraft is well verified, and it can be used for the design of the aircraft controller and its aerodynamic shape. The modeling method and the verification method are applicable to fixed-wing aircraft including tandem wing aircraft.
Dynamic characteristics of high-speed railway vehicle with axle box bearing faults
Authors: Xinna Ma , Jingwei Liu , Wenrui Shi
Published: August 2019

Based on the motion characteristics of axle box bearings and taking high-speed railway vehicles as the research object, a vertical dynamic model of 17-DOF car body-bogie-axle box bearings-wheel set is proposed. Aiming at the surface fault of axle box bearing, the New-Mark fast numerical integration method is used to simulate and analyze. The dynamic characteristics of railway vehicle under early failure of axle box bearing on inner ring and outer ring raceway surface are studied. The vibration characteristics of axle box bearings under different fault degrees and different vehicle speeds (axle box bearing speed) are analyzed. The changes of vehicle dynamic performance and vibration characteristics under fault evolution are discussed. The analysis results show that the vibration of car body and bogie is little affected by the early fault of axle box bearing; with the deepening of the fault degree, the vertical vibration acceleration and displacement of axle box bearing are increasing; with the increase of vehicle speed, the motion state of axle box bearing undergoes a change from periodic motion, quasi-periodic motion to chaotic motion. Finally, the dynamic simulation results of axle box bearing fault evolution in high-speed vehicle system are validated on the experimental platform. The research work has certain reference value for vehicle condition tracking and monitoring.
Improved Droop Control Strategy with Fast Equalization for SOC Based on Power Balance in Energy Storage System
Authors: Zhang Heng , Sun Shiyu , Feng Gaohui , Shi Bingqing
Published: August 2019

In parallel operation of energy storage units, the droop control based on voltage and current tends to neglect the difference of SOC in energy storage unit, which leads to the withdrawal of some energy storage units from the system due to overcharge or overdischarge, thus causing the voltage fluctuation of DC micro-grid bus. To solve this problem, an improved droop control strategy with fast equalization for SOC is proposed. With the SOC of energy storage batteries, the acceleration factor can be calculated in real time, so as to improve the speed of SOC equalization and power distribution. Finally, the validity of the control strategy is verified by simulation results with MATLAB/Simulink.
Research on Process Parameters Optimization of Fine Blanking for Intermediate Washer of Clutch Based on Orthogonal Test
Authors: Mu Rui , Wang Xiaoli , Wang Caihong
Published: August 2019

Intermediate washer of automobile clutch is taken as research object, blanking clearance, radius of corner of punch, blanking speed, blank holder force, counter force and tooth angle of blank holder are selected as influencing factors, length of shear zone is chosen as evaluation index. Orthogonal test with six factors and three levels is established, and Deform-2D is used to simulate fine blanking process of intermediate washer at different combinations of process parameters. Blanking clearance has a significant influence on length of shear zone by variance analysis. The influence sequence of fine blanking process parameters on length of shear zone is blanking clearance, counter force, radius of corner of punch, blank holder force, blanking speed and tooth angle of blank holder. In addition, the optimal combination of process parameters of fine blanking for intermediate washer are as follows: blanking clearance is 8%t, radius of corner of punch is R0.09 mm, blanking speed is 15 mm•s−1, tooth angle of blank holder is 45°, blank holder force is 450 kN and counter force is 150 kN. The simulation value and experimental value of length of shear zone for optimized scheme are 3.945 mm and 3.438 mm respectively, the relative error between simulation value and experimental value is 12.9%. Therefore, it provides an important reference for the actual production of enterprise.
Analysis of Shear Lag Effect in Twin-cell Box Girders
Authors: Luo Min , Lin Peng-zhen , Sun Li-xiang
Published: August 2019

For the twin-cell box girder, considering the difference of the shear lag between each cantilever plate, the shear lag warping displacement function of each wing of the box girder is defined. Based on the basis of the variation principle, the governing differential equations for considering the shear lag effect of twin-cell box girder are established. For a typical simply supported beam of twin-cell box girder, according to the three dimensional numerical methods used for plate and shell and the analytical solution method in this paper, the shear lag distribution law of uniform load and concentrated force has been studied. The results show that the shear lag warping displacement model proposed in this paper can reflect the difference of shear lag between each cantilever plate. The analytical solution is in good agreement with the finite element numerical solution. The shear lag effect at the top and bottom of the web site of the twin-cell box girder is different from that of the edge web site. In this paper, the stress at the top and bottom of the middle web is smaller than that at the side web.
High spatial efficiency single-particle trapping array based on a microfluidic device
Authors: Duan Yu , Zhang Weiguan , Peng Zhengchun
Published: August 2019

High-throughput single cell trapping is critical for cell biology research. In this paper, a microfluidic device with micro-cup array is designed to achieve high-throughput single-particle trapping. Microspheres were aspired in the micro-cup array and immobilized in site by hydrodynamic force generated by the flow. Design of micro-cup is optimized based on “least flow resistance path” principle showing that higher volume flow ratio leads to better capturing efficiency. The result showed 100% capturing efficiency with flow ratio of 1.744. Also, by placing the micro-cup structure side-by-side in the channel, high-throughput of the microfluidic device is realized. 35 microspheres can be captured in the trapping area of 160×510 μm2 which is a promising tool for high-throughput single cell analysis.
Study on Thermal Performance of Silicon Oil Clutch for a Cooling Fan
Authors: Zhai Shufeng , Yao Qian
Published: August 2019

In this paper, a silicone oil fan clutch is taken as the research object. The finite element model of the clutch is established in the form of hexahedral mesh by using HyperMesh software. The thermal field and flow field are coupled in the model and simulated. The temperature distribution of the front and rear ends of the clutch is simulated and analyzed. The relationship between the number of radiating ribs and the temperature distribution of the front and rear ends of the clutch is analyzed. The temperature distribution of the front and rear ends of the clutch is tested by the silicone oil fan clutch performance test rig. The experimental results are consistent with the simulation results, and which shows that the finite element model is feasible. The influence of the number of radiating ribs and the internal structure of the clutch on the heat dissipation performance of the silicone oil fan clutch is calculated and studied. The results have important guiding significance for improving the silicone oil fan clutch and shortening the development cycle of the clutch.
2-D Scanning LiDAR with MEMS Mirror and STM32
Authors: Yangyang Wu , Qian Ke-Yuan
Published: August 2019

In this paper, the 2-D scanning rangefinding LiDAR based on MEMS mirror and STM32 is proposed, in terms of time-of-flight(TOF) measurement, employing a APD as photodetector in order to steer nanosecond pulsed beam. The aim, centimeter-level measurement accuracy with low power consumption and a scanning angle of $+/-30^\circ$, were achieved using application-specific integrated circuits, optical system, TDC-GP21 chip and MEMS mirror. Compared to the traditional system, the volume of this model is much smaller. The basic function of the scanning system of receiver optics is already checked experimentally.
The Accumulative Component Kurtosis in the SVD Based Denoising of the Fault Diagnosis for Rolling Element Bearing of Generator
Authors: Li Xiaoquan , He Jiangjiang , Cheng Yuemeng , Zhao Yuwei
Published: August 2019

Rolling bearings are important load-bearing components that are prone to failure, so it is necessary to reveal their failure mechanisms. As the singular value mainly reflect the energy of the decomposed singular components (SCs), the singular value decomposition (SVD) de-noising tend to preserve the significant-energy SCs and ignoring the neglected one, thus weaken singular has the ability to detect the incipient fault of the mechanical systems. In this paper, accumulative component kurtosis based SVD reconstitution scheme is proposed for mechanical signal denoising to detect the incipient fault of the generator systems. With the kurtosis index, the decomposed SCs can be evaluated and sorted not only according to their energy but also the contribution to the de-noising effect. In this way, the sensitive SCs could be taken into calculation effectively. The advantages of the ACK-SVD over traditional approaches are verified by both simulated signals and real vibration data from the rolling element bearing rig. The results proved the incipient fault feature even with heavy background noise could be extracted successfully.
Vibration control of two-degree-of-freedom exponentially damped oscillators
Authors: Xiu Guozhong , Bao Shi , Zhao Wenfei , Yuan Jian
Published: August 2019

Vibration control of two-degree-of-freedom (2DOF) exponentially damped oscillators is considered. Firstly, the equations of motion for 2DOF exponentially damped oscillators are established by using the nonviscous damping models that depend on the past history of motion. Secondly, the equations of motion for 2DOF exponentially damped oscillators are transformed into state equations with six dimensions by using a set of internal variables. Thirdly, Sliding control design is proposed. Furthermore, this control method can also be used in the multi-degree-of-freedom (MDOF) exponentially damped oscillators. Finally, numerical simulations are provided to illustrate the above control designs.
Classification of Ischemic Stroke Lesions Based on Cascaded Branch Compression Neural Network
Authors: Jiang Fengbing
Published: August 2019

Automatic differentiation of disease images with machine vision technology is of great significance for medical diagnosis. This paper proposes a deep neural network architecture to achieve the classification of ischemic stroke lesions. The proposed architecture uses a cascading approach. The image obtained by down-sampling each image and the original image are respectively input into two convolutional neural networks of different depths and are associated with each other through a cascade structure to solve the defect that the single network cannot balance the local features and the global features. In addition, the use of smaller images obtained after downsampling can effectively improve the operational efficiency of deep networks. The experimental results show that the proposed algorithm can balance the accuracy and timeliness well.
A Deep One-class Model for Network Anomaly Detection
Authors: Dai Songlin , Yan Jubin , Wang Xiaoming , Zhang Lin
Published: August 2019

For traditional network anomaly detection system, the detection performance is related to the selected features and training dataset. But traditional methods adopt handcraft feature selection, which requires heavy human labour and relies on the experts’ knowledge and experience. Besides, the collected dataset for training is not balanced, which makes the prediction of the trained model tends to be biased to the majority class. In this paper, a one-class network anomaly detection model based on the stacked autoencoders was proposed. We use the stacked autoencoders to select the prominent features from the raw collected data, then apply the one-class classification algorithm support vector data description to train a classifier to identify the network traffic into normal data and anomalous data. The experimental results demonstrate the promising results of our approach for network anomaly detection.
Abrupt motion tracking of Ochotona curzoniae via improved motion model based on particle filter
Authors: Chen HaiYan , Zeng YuHui , Chen Gangqi
Published: August 2019

The movement of Ochotona curzoniae is random, unpredictable, and often accompany by abrupt motion, Ochotona curzoniae has protective coloration, and possesses the characteristic of having low contrast with its typical background. Particle filter algorithm has been widely used to solve tracking problems, they can solve nonlinear and non-Gaussian problems. The motion model of the particle filter tracking algorithm ignores the acceleration factor, the observation values of position could not represent the future position. Due to this problem, this paper introduces acceleration variance of the “current” statistical model to motion model. In addition, this study fuse color feature with gradient feature as an observation model to overcome interference factors like a complex background, and low contrast. The experimental results show that the improved motion model and observation model has a better performance for abrupt motion, and could accurately track Ochotona curzoniae.
Optimization Design of the Wire Repair Tool for the Maintenance Robot with Charged Used in Substation
Authors: Dong Xu , Fu MengChao , Li Jianxiang , Li Jian , Zhao Yabo
Published: August 2019

With the continuous development of the society, the development of the power grid is faced with the demand for high power supply reliability and high power quality, and there are fewer and fewer opportunities for power outage maintenance on important and critical lines. The damage of the wires in the overhead lines of the substation will affect the efficiency of the transmission. In this paper, the optimization design is carried out on the basis of the wire repair tool. The optimized tool adopts the structural design of the wire repair tool with insulating material to ensure the insulation performance. In this paper, the optimization design of the repair patch, clamping arms, transmission mechanism with worm gears and worm shaft, and wire gathering device is carried out. The structure, the motor drive system and control principle of the tool are also improved. The wire repair tool has been optimized for miniaturization, light weight, and intelligence
Application of Labview machine vision in bearing size measurement
Authors: Huang Shuai , Shi Liping
Published: August 2019

Bearing is widely used in mechanical equipment, and its manufacturing accuracy has a very important impact on the normal operation of mechanical equipment. This paper mainly introduces the Labview software as the development platform to build a set of size measurement system of bearing parts based on machine vision. The hardware consists of CCD camera, light source and ball bearing. Using Labview and its visual tools, the program of bearing size measurement is developed. The results show that the method is stable and practical, and can meet the requirements of industrial testing. The accuracy is about 0.2mm.
The design of medical micro atomization device based on piezoelectric actuators
Authors: Zhou Haimin , Shi Liping , Tan Jiliang , Huang Shuai
Published: August 2019

In this paper, there is much demand for more advanced inhaled drug treatment on respiratory diseases treatment, so we design and manufacture a kind of medical micro atomization device based on piezoelectric actuators. In the experiment, the first measuring method we used is the diameter of the fog particles compare with quartz round bead in 1 micron. The second measuring method is weighing bibulous desiccant. The experimental results show that the fog particles produced by micro atomization device is 3 ∼ 4 microns in diameter, and fog particles rate is 0.07 ∼ 0.08 g/min. These data basically meets medical micro atomization device design requirements for the diameter and flow rate of fog particles on respiratory diseases treatment.
Design of Integrated Impeller Processing Fixture and Force Analysis of Key Parts
Authors: Liao Longxing , Gao Peili , Meng Xiangdong , Meng Zhaohang , Xie Wenxiang , Zhang Zhenyu
Published: August 2019

This paper designs a box-type fixture based on SolidWorks software so as to provide a special fixture for stable and fast positioning of integrated impeller processing. It uses mechanics to analyze the force of the central axis, and the Simulation module to conduct stress and strain calculation. Example verifies the feasibility of the design. The design analysis provides a theoretical basis for the integrated impeller processing industry and is practical for its reference value.
Design and Simulation of a Compliant Mechanism Based on Crossed Curved Beam
Authors: Lin Sheng , Wang Xinning
Published: August 2019

A compliant mechanism based on the crossed curved beam is proposed. The working principle of the mechanism is induced. The finite element method is utilized to analyse the statics and dynamics of the compliant mechanism. Results show that the compliant element of the crossed curved beam has higher bearing capacity. The six-order natural frequencies and vibration types of the compliant mechanism are obtained. The vibration types are in accordance with the degrees of freedom.
The Application Module Design of Three Application Scenes of Intelligent Exhibition
Authors: Zhang Jiankang , Fan Jiaxuan , Ni Xiaowei
Published: August 2019

Intelligent venue, intelligent exhibition and intelligent conventions are three application scenarios of intelligent exhibition. The application module design of intelligent venue includes a basic business module, personalized experience module, system integration module, and people flow value module. The application module design of intelligent exhibition includes builder management system, exhibition customer relationship management system, exhibitor management platform, audience registration management, the system to match business opportunities, exhibition data analysis, etc. The application module design of intelligent conventions includes VIP database, reception service, convention service module, etc. Chinese exhibition enterprises should further explore and practice three application scenarios of intelligent MICE to meet the development needs of new forms of exhibitions.
Reading Aviation Wire Text in Natural Images under Assembly Workshop via Deeplearning
Authors: Li Shufei , Zheng Lianyu , Wang Yiwei , Zhang Renjie
Published: August 2019

Reading aviation wire text is an important step for aircraft wire assembly and also a challenging problem. Aviation wire text reading means to detect and recognize the serial number printed on the surface of aviation wires or aircraft cables. The main challenges of this task lie on small sizes, low contrast and background noise in images. In this paper, we propose a new method for aviation wire text detection and recognition via deep neural networks. The detection network utilizes text border features to roughly locate text regions in images. Then the coordinates of bounding boxes of texts are regressed by pixel-level predicted offsets in adjacent regions. The recognition network is capable to recognize the text regions with diverse lengths after padding strategies. In addition, a dataset of aviation wires captured by machine vision camera in the assembly workshop is developed. A flexible method to generate synthetic images of text whose characters are arranged in styles of both head-to-tail and left-to-right is presented. On aviation wire datasets, the proposed method for text detection and recognition achieves comparable performance and significantly outperforms previous approaches.
Design of ZVS DC/DC converter based on DSP2812 phase-shifted full bridge
Authors: Qi Hui , Liu Kaifeng
Published: August 2019

The phase-shifted full-bridge DC/DC converter is a very important component of power electronics and is suitable for medium and large power output applications based on switching power supplies. Aiming at the implementation of soft-switching and the problem of power loss, this paper firstly describes the structure and working mode of DC/DC converter, then analyzes the calculation and selection process of resonant inductance and capacitance parameters in the converter, and finally adopts the traditional PI control to achieve stable control of the output voltage. The simulation and experimental results fully prove the feasibility and rationality of the design and parameter selection of this scheme.
Design on Program-Controlled Initiation System of the SCB explosive devices Based on Optical Fiber Communication
Authors: Li Yunfei , Jia Ningke , Wu Xiaolong , Hu Ye , Cao Xiaopeng
Published: August 2019

A control system for Semiconductor Bridge explosive devices is designed based on optical fiber Communication, which can make the explosive devices perform better in the complex electromagnetic environment. By the combination of programmable bus controller, ignition unit and the optical fiber communication, the ignition of the explosive devices in chronological order could be realized. After the system design was completed, the major function and anti-electromagnetic interference capability were tested. The results indicated that the system had remote-control ability, high reliability, high security and good electromagnetic compatibility. The system can be used in more complicated electromagnetic environment than the conventional initiating explosive devices.
Design of UAV Detection Scheme Based on Passive Acoustic Detection
Authors: Jin Hengkang
Published: August 2019

With the rapid development of UAV technology, the “black flight” of UAV is an urgent problem to be solved in daily work and life. In this paper, the current research status of unmanned aerial vehicle (UAV) detection system at home and abroad is described, and a design idea of UAV detection system based on sound signal is proposed for radio spectrum monitoring, radar detection, light detection and exploratory problems. Combined with the needs of the problem, aiming at the three key problem links of the system, the paper puts forward specific solutions to provide the foundation for the system implementation and application in the next step.
Comprehensive evaluation for active distribution network
Authors: Hao Yongjing , Qian Jiang , Zhao Yi , Feng Zuodong
Published: August 2019

Recently, the integration of DG (distributed generation) with high penetration and new loads lead to the transformation to active distribution network. Thus, it is necessary to propose a more suitable comprehensive evaluation index system to achieve the scientific evaluation of operation state and the development of active distribution network. This paper presents a new comprehensive evaluation index system for the active distribution network considering the influence of DG and new load. The combined weighting method based on the variable weight theory and the multi-layer fuzzy comprehensive evaluation method based on the improved trapezoidal cloud model is proposed to solve the model. Finally, case study is carried out to verify the validity of the proposed method and provide the reference value for the future development of distribution network.
Analysis of Distributed Inter-satellite Link Network Coverage Based on STK and Matlab
Authors: Yue Zhang , Yunxin Guo , Jiacai Hong
Published: August 2019

Jointing STK and Matlab to solve the problem of GNSS system inter-satellite measurement and control network coverage. By using the interface provided by both parties, Matlab can directly control STK for task analysis, and obtain professional orbit data and star directly from STK. The distance information is processed and analyzed by Matlab. The preliminary analysis results of the link coverage of distributed inter-satellite link network routings show that the distributed network coverage is low and the satellite antenna resource utilization is low. It is necessary to set optimization conditions to improve network coverage and on-board antenna utilization rate.
An Improved Symbol Timing Synchronization Algorithm in FBMC Systems
Authors: Yang Ruyu , Luo Zhinian
Published: August 2019

A novel symbol timing synchronization algorithm by iterative method is proposed for FBMC / OQAM systems. In the iterative process, different methods are used for rough timing synchronization and fine timing synchronization. Firstly, the ZC (Zadoff-Chu) sequence delay correlation is used to estimate the coarse timing by cross-correlation. After the coarse timing synchronization compensation, the auto-correlation is used to estimate the carrier frequency offset, so that better frequency offset estimation performance can be obtained. Then, the estimated frequency offset is subjected to sequence compensation, and finally, the fine symbol timing synchronization is performed using the compensated sequence. Compared with other algorithms, it can be concluded that the proposed algorithm can obtain high precision of timing accuracy when there is frequency offset in the system.