bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Wavelet Analysis in the Vibration Signal of the High Dam Drainage
Authors: Gu Yujie , Xi Ruichao 
Published: August 2019

Abstract
Wavelet analysis is a localized time-frequency analysis method,it uses the combination of time domain and frequency domain to show the characteristics of a signal. In this paper uses the wavelet analysis to decompose the vibration signal in different frequency band. And we can get the energy of the signal in different frequency band and the vibration characteristics of the slab by decomposing different frequencies and the different scales of the signal analysis at the different frequency band. According to the signal noise sigma, doing the wavelet threshold noise reduction uses the general threshold, the threshold set by Birge-Massart strategy, the threshold set by penalty strategy and the strategy of the threshold to estimate sample signal, then gets the best scheme.
Parameters identification of PMSM based on self-adaptive DE algorithm with hybrid mutation operator
Authors: Wang C , Liu Y C , Wei Y , Chen Y , Xu M Y , Guo H H , Zhang Q J , Liang X L 
Published: August 2019

Abstract
The parameter identification of permanent magnet synchronous motor (PMSM) is an important and challenging task of power electronic systems, which has an important impact on the control performance of the drive system. Due to hardware limitations, this problem requires both a higher solution quality and a faster convergence speed. Aiming at the parameter identification problem, an adaptive differential evolution algorithm based on hybrid mutation operator (SHDE) is proposed. In this method, a randomly selected optimal solution is mixed with the current population, and a new mutation operator is developed, called “current to best archive”. Therefore, the algorithm can use the best search memory to date to generate promising solutions, resulting in a faster evolutionary process. In addition, the SHDO corresponding control parameters are adaptive without the need of trial and error and error processing, and the appropriate control values are obtained. In addition, the parameter estimation program is introduced into the permanent magnet synchronous motor simulation and solved by the Newton-Raphson method without prior assumption and simplification. The framework can be used in any interference-prone working conditions and, unlike other publications, has a wider range of applications. The parameter identification method of permanent magnet synchronous motor drive system under two different operating modes was evaluated. Comprehensive results and statistical analysis show that SHDE can find higher quality solutions with higher convergence speed and probability than other most advanced algorithms.
The Software System Implementation of Speech Command Recognizer Under Intensive Background Nosie
Authors: Song Jingyu , Chen Bo , Jiang Kun , Yang Miaosheng , Xiao Xi 
Published: August 2019

Abstract
A device for speech command recognition is designed and implemented in this paper. The adaptive filtering technique is adopted for speech enhancement by using two microphones for sampling the background noise and noisy speech signal correspondently. The connected-word speech recognition algorithm based on HMM is employed for speech command recognition. The experiment shows that the equipment can work well under the background noise of 90dB.
Fault Detection of UAV Fault Based on a SFUKF
Authors: Zhong Wang , Xin Chen 
Published: August 2019

Abstract
The UAV system is a typical closed-loop control system. Its good robustness can inhibit the fault signal, which poses certain difficulties for the detection of early or small amplitude faults. In this paper, a nonlinear longitudinal control system model of a class of UAVs is established, and a fault detection method based on the suboptimal fading unscented Kalman filter (SFUKF) is designed. Aiming at the common failure of actuators and sensors of the drone, this paper proves that the method realizes the fault detection of the airspeed tube blockage and the elevator part failure by simulation.
An Improved Rotor Position Estimation Method for PMSM Based on Pulsating Square-Wave-Type Voltage Injection
Authors: Lin Cheng , Sun Jiaxu 
Published: August 2019

Abstract
This paper presents a pulsating high-frequency square-wave-type voltage signal injection based sensorless rotor position estimation method for permanent magnet synchronous motors (PMSM). In order to increase the injection frequency so as to enhance the control system’s bandwidth, square-wave-type voltage is injected instead of sinusoidal voltage. To avoid disturbances, the sampling frequency is set as equal to the PWM switching frequency so that the injection frequency can be half of the switching frequency. Due to the characteristics of the square-wave-type voltage, the signal processing is further simplified without the use of filters, which can eliminate the time delay and increase the system’s computational efficiency and feasibility. As a result, the rotor position estimation performance is improved and the sensorless control system’s dynamics is enhanced. Results of simulation verify the effectiveness of the proposed method and its applicability to PMSM sensorless control systems.
Analysis of Characteristics of Industrial Power Load in a Certain Region
Authors: Tiantian QIAN , Ke WANG , Fei SHI , Kedong ZHU 
Published: August 2019

Abstract
Cluster analysis was done on the industrial load in the same class industry, based on the industrial daily load data collected in a certain region. The results obtained indicate that even in the same industry, there are still large differences in load characteristics, and there is a certain similarity between loads in different industries. Compared with the traditional results of cluster analysis of the overall industrial load, cluster analysis by industry will help power companies to carry out more precise load management.
Theoretical Modeling and Experimental Verification of Rotating Ultrasonic Drilling
Authors: Sun Hong 
Published: August 2019

Abstract
Aiming at the problems of large drilling ability and serious wear of drill bit tool in the process of drilling, the connecting plate workpiece in the high strength engineering mechanical connection parts of carbon fiber reinforced composites is studied, and the theoretical model of ultrasonic drilling is established, and the simulation analysis is carried out by using the professional numerical calculation software MATLAB. The influence of the main parameters such as tool feed speed, spindle angular velocity and ultrasonic amplitude on the drilling force during ultrasonic drilling is studied, and the relevant parameters under the same working conditions of simulation are verified by experimental method. The simulation and experimental results show that with the increase of tool feed speed, the drilling force shows the trend of increasing gradually, and with the increase of spindle angular velocity and ultrasonic amplitude, the drilling force shows a decreasing trend, and the simulation value of maximum drilling force under different parameters is basically close to the experimental value, which verifies the correctness of the theoretical model. It provides theoretical basis and important reference for the improvement of the comprehensive performance and product quality of the ultrasonic drilling parts of carbon fiber reinforced composites, the popularization and application of the theoretical model of ultrasonic drilling, the optimization of ultrasonic drilling process parameters, and the ultrasonic processing and molding of composite materials.
Application of micro wire on the sample made from asphalt mixture with using bitumen
Authors: Bokomlaško J , Mandula J 
Published: August 2019

Abstract
The micro wire are new possible sensors, when serves for the contactless measurement of the deformations, which arise in the sample. We can have correct measurement, with right length, diameter and application of the micro wire on the sample. The micro wire was used to two samples, which were made of asphalt mixture AC 11. Bitumen was used in order to glue the micro wire to the test sample. The signal was sufficiently strong for both test specimens. Measurement was made on a sample in the form of a beam. The reaction of the micro wire to the load applied was evaluated. Measurement was done in cycles. In total, three measurement cycles were performed. Measurement results were evaluated.
Evaluation of the effect of concrete strength increase on buckling resistance of concrete filled tubes
Authors: Bukovska P 
Published: August 2019

Abstract
The paper deals with the behaviour of steel tubular columns filled by high-strength concrete at compression load. Attention is paid especially to the strength of the used concrete and its effect on the buckling resistance of column. Results of the experimental part of research have shown that increasing of concrete strength is efficient only to a certain extent. It was found in the experimental analysis that the use of concrete class C80/95 has only little effect on increase of buckling resistance as compared with the use of concrete class C55/67. In order to evaluate the efficiency of the concrete strength increasing, a theoretical study was carried out, the results of which are presented in this paper. The paper also discusses the possibilities of using other types of concrete (light-weight concrete or slightly reinforced concrete) with regard to their contribution to improving the bearing capacity and taking into account the production costs of the steel - concrete tubular column.
Effect of water wall prototype on air humidity
Authors: Čákyová K , Vranay F 
Published: August 2019

Abstract
The presented document focuses on the effect of the water wall on air humidity (humidification and dehumidification of air). For the purpose of impact verification, a water wall prototype that was tested under laboratory conditions (climate chamber) was designed and built. Also a set of measuring sensors has been installed, these sensors are able to continually record air temperature and humidity and water temperature. In the case of air humidification, the water temperature and air temperature were equalized approximately after 2 hours and after 6.5 hours the air relative humidity reached 92%. This represents an increase in the specific humidity of 4.5 g/kg versus the initial state. The article also describes methodology and measurement of condensation ability of the prototype. In case of air dehumidification process, three different relative humidity was tested at the same air temperature. During the measurement periods, there was increasing the amount of condensate several times by increasing the relative humidity.
Slab deformations caused by shrinkage – experiment vs. numerical calculation
Authors: Kušnírová D , Priganc S 
Published: August 2019

Abstract
This article gives an overview of the experiment, which aims to detect the effect of the shrinkage on the stress and the strain of the slabs reinforced at one surface by different types of reinforcement (steel and GFRP reinforcement). Some partial results from the strain measurements on steel reinforced slabs and their comparison with numerical calculation are also reported in the article. From publications found larger bending tensile creep towards compression creep can explain the difference between calculation and experiment.
New aspects of shore stabilization
Authors: Slezingr M , Fernandez P A , Ondrejka Harbulakova V , Pelikan P 
Published: August 2019

Abstract
The basis for a design of stabilization measures for banks of watercourses and reservoirs is an assessment of the bank from the perspective of the material it consists of, the existing slope inclination, and the current elements of natural or artificial stabilization. Another important step is to assess the potential cause of the bank damage, the probability of its occurrence, and the significance of possible damage with respect to the bank usage. If the basic assessment of the current state of the riparian area concludes it is really possible that erosion damage to the bank may appear and develop, one of the types of bank reinforcements has to be designed.
Evaluation of the antimicrobial efficiency of slag based composites
Authors: Smolakova M , Vojtkova H 
Published: August 2019

Abstract
Degradation of cement mortar composites occurs due to a variety of causes such as corrosion (sulphate or chloride attack) cracking or shrinkage. Chemical agents often play a major role in corrosion processes, however recent research has revealed the importance of biological agents. Microbiological corrosion is caused by the presence and activities of microorganisms, including algae, bacteria, yeasts and fungi. These microorganisms produce substances like biogenic organic and mineral acids that can disrupt the matrix of mortar composites. The most effective method for improving the resistance of cement based composites is the addition of pozzolans like blast furnace slag. Slag is often used in preparation of cement composites to improve the acid resistance, impermeability and crack resistance of mortars. This article presents the investigation of antimicrobial efficiency of blast furnace slag regarding the selected species of bacteria (Pseudomonas aeruginosa, Micrococcus luteus), yeasts (Candida albicans, Saccharomyces cerevisiae) and algae (Chlorella vulgaris). Antimicrobial properties were studied on mortars with different share of slag (65% - 95%). Antimicrobial efficiency for the tested species of microorganisms was found moderate to low.
How and where to use technology of laser scanning and aerial photogrammetry for building purposes – case study
Authors: Tkáč M 
Published: August 2019

Abstract
Laser scanning is a method of high – accuracy mapping or reality capture that uses laser beams to quickly capture complete detail of the entire building construction project in a short time. Laser scanners are a great tool for measuring existing buildings but not always because they have the same problem as visual surveys-if you can’t see it, you can’t scan it, i.e. the laser beam from the scanner can’t measure a certain part of the surface of the structure if this part isn’t in the scanner’s field of view. In particular, this limitation applies to the surfaces of the roof structures and certain parts of the facades. In these cases, the resulting point cloud may contain no information from the building surface what may be a problem for the final results. A possible solution is a combination of two technologies, terrestrial laser scanning and aerial photogrammetry. Aerial photogrammetry (or airborne imagery) means taking of photographs from an unmanned aerial vehicle (i.e. “drones”). The aim of this paper is to describe the use of these two technologies, it means, when it is better to use these technologies separately and when it is better to make their integration. As a reference building the Faculty of Civil Engineering, located in Kosice, Slovakia was chosen
Zero house by 3D printer technology
Authors: Wawrek I 
Published: August 2019

Abstract
Implementation of 3D printing technologies into building process is recently one of the most developing sectors. Research teams come every day with new ways of use of this technology. Research is focused on testing thermal – technical properties of certain wall structure built by 3D printing additive technology. Based on results of calculation and measurements will be done optimization of design of mentioned wall structure. The goal of the research is to design wall structure with performance of “zero” house. Another goal is to extend knowledge in area of 3D printing and create new possibilities to better adaptation autonomics 3D printing to building process of the future.
Research on lightning radiation electromagnetic field of induced thunder on the ground of perfect conductor
Authors: Li Mu , Li Tao , Ye Chunyong , Fang Shubo 
Published: August 2019

Abstract
The influence of lightning on smart substation mainly includes three aspects, one of which is lightning striking the grounding body of adjacent smart substation and affecting smart components through space electromagnetic induction. When the lightning strike point of induction lightning is in the station, its radiation field is closely related to the location of the lightning strike point. It is necessary to verify whether it meets the electromagnetic compatibility level of intelligent components of lightning radiation field according to the actual situation. Firstly, the simulation model of intelligent component under the influence of induction mine is studied, and the steps of simulation modelling are given. On this basis, through derivation, the calculation method and corresponding formula of lightning current radiation field on the ground of perfect conductor are given in detail.
First-Principles Study of Structural, Elastic, Electronic and Optical Properties of Zinc Ferrite Spinel
Authors: Meng Yifeng , Shi Weimei , Lu Chao , Yang Shiqing , Yang Qingxue , Deng J. G. 
Published: August 2019

Abstract
Structural, electronic,elastic and optical properties of ternary spinel oxides ZnFe2O4 have been studied by using first-principles calculation. The results show that all elastic constants are consistent with the mechanical stability criteria for cubic crystals, which indicated that ternary spinel oxides ZnFe2O4 are mechanically stable. The perfect spinel ZFO has the properties of direct bandgap semiconductor, which decreases with the increase of pressure.The DOS and Mulliken overall analysis shows that the Zn-O bonds and Fe-O bonds are covalent, and the Zn-O bond is stronger than the Fe-O bond. The results of the calculation show that the optical properties are in good agreement with the recent experimental results.
Simulation Analysis of Six-axis Manipulator
Authors: Tian Zhihong , Li Yaoyao , Tian Shuo , Ning Peiying 
Published: August 2019

Abstract
The D-H parameter method is used to model the six-axis manipulator. Based on this model, the forward and inverse kinematics equations of the manipulator can be derived, so that the relationship of manipulator joint angle and the pose of manipulator can be obtained. Using the fifth-order polynomial interpolation method realizes the manipulator trajectory planning. In this paper, using the free Robotics Toolbox to simulate manipulator, the results show that the simulation of the manipulator is accurate and intuitive, which can provide theoretical basis and reference basis for the actual design and motion control of the manipulator.
RGV Dynamic Scheduling Strategy Based on Network Cellular Automaton and Marko Model
Authors: Yin J Y , Chen N , Zhang Z T , Chen S S 
Published: August 2019

Abstract
In an intelligent processing system, if a Rail Guide Vehicle (RGV), also known as automated guide vehicle, is provided with the optimal dynamic scheduling strategy, the work efficiency and economic profit of the workshop can be greatly improved. This paper considers the variable number as well as the types of Computer Number Controller (CNC) and regards the real problem as the Job Shop Scheduling Problem (JSSP). To solve JSSP, this paper use Network Cellular Automaton (NCA) to abstract the flexible workshop system and apply the rule of one-step trial-and-error for the core link between the network cellular automaton and the Markov Transition Probability Matrix. Further this system is simulated using Markov chain in probabilities to expand the solution space with the optimal solution among according to the Monte Carlo experimental principle. Finally, the result can jump out of the local optimal solution and approximate the global optimal dynamic scheduling strategy by trial-and-error rule and Transition Probability Matrix. To verify the NCA-Markov model, this paper use an intelligent flexible workshop which produces two-process materials. By simulating this system with the model, the efficiency of the intelligent processing system can be greatly improved.
Speed Trajectory Tracking Control for Free-Floating Space Robot with Uncertain Inertial Parameters
Authors: Qi Tian , Yanfei Liu , Zhong Wang , Pengtao Zhao 
Published: August 2019

Abstract
A speed trajectory tracking control (STTC) approach is proposed to optimize the end-effector trajectory tracking control for free-floating space robot (FFSR) with uncertain inertial parameters, where two stages controller are designed by the state dependent Riccati equation (SDRE). Firstly, the first-stage SDRE nominal optimization controller is designed by using the nominal system model. Next, by analyzing the error transfer process resulting from uncertain parameters under the nominal control law, the second-stage SDRE compensated controller is designed by the state dependent matrix (SDM) of the system state errors. Then, the optimization tracking control for the FFSR with uncertain inertial parameters is achieved by combining the first-stage SDRE nominal optimization controller and the second-stage SDRE compensated controller. Finally, numerical simulations are given to demonstrate the proposed approach which satisfies the precision of the tracking error and the optimization requirement of the input torque.
Back pressure optimization of direct air-cooled condenser considering anti-freezing and low-load operation
Authors: Feng Pengyuan , Luo Zhiling 
Published: August 2019

Abstract
Direct air-cooled condensers are widely applied in northwest China because of water-saving. In order to improve the economical operation of the direct air-cooled condenser, based on the mechanism model, this paper calculates the optimal back pressure considering anti-freezing and low-load operation with considering the switching state of the exhaust steam isolation valves, and ensuring the minimum exhaust steam. The influences of ambient temperature and load ratio on optimal back pressure and energy saving are studied, which provide guidance for cold-end optimization and economic operation of direct air cooled condensers.
A New Ultrasonic Gas Meter for Household Application
Authors: xiaodan Xu , fuzeng Li , fugen Zhou , weiguo Zhao 
Published: August 2019

Abstract
This paper proposes a new ultrasonic gas meter based on the time difference method. The gas flow measurement model is derived to reduce the environmental impact. A fluid pipeline structure is designed to reduce the impact of the flow field on the measurement. The max35104 time measurement chip is selected and the corresponding transmit and receive circuits are designed. Finally, the ultrasonic gas meter is tested in a standard device. The experimental results show that the designed household ultrasonic gas meter has an accuracy rating of 1.5 level.
Influence of CNC Tools on CNC Machining Technology
Authors: Yinsheng Wan 
Published: August 2019

Abstract
The continuous development of China’s production technology has brought a broader space for the development of CNC technology, bringing a new intelligent development direction for the machinery manufacturing industry, which has a great impact on the production of tools. The birth of CNC tools has promoted the development of the CNC industry and promoted the CNC machining process. This paper aims to analyze and study the CNC tool and its machining process.