(1)Prof.Wei Liang, Shanghai University of Engineering Science, China
Title: Applications of surface acoustic wave microfluidics
Abstract: The applications of using acoustic fields, principally ultrasonics, are usually applied in microfluidics. When a micro-volume droplet is placed on a surface acoustic wave propagation surface, mode conversion will happen at the liquid-solid interface and droplet will deform and begin to move. A model for the numerical simulation of the movement of liquid droplets excited by surface acoustic waves propagating on piezoelectric and non-piezoelectric substrates was developed. The results reveal the jet phenomenon and periodical deformation of the droplet during the movement. The theoretical model can be used to predict the droplet movement on different substrates.
(1)Haiying Li, University of Shanghai for Science and Technology, China
Title: Simulation on Temperature and Ampacity of Mining Flame-proof High Voltage Cable Connector
Abstract: To investigate the accident causes of mining flame-proof high voltage (F-HV) cable connector, the temperature and ampacity of LBG1-200/6 high voltage cable connector are analyzed. At first, the material properties and structure of connector are introduced from the aspects of electrical, insulation and thermal. Then the electromagnetic field and thermal field coupling model of cable connector are established by the finite element method. Finally, in the numerical examples, temperature distribution and ampacity change caused by power harmonics, dielectric loss and slight structure change are quantitatively plotted and analyzed. The paper provides great insight into the security operation of F-HV cable connector.
(2)Zhen Jia, Jiangsu Automation Research Institute, China
Title:Analysis and Simulation of Multi-target Echo Signals from a Phased Array Radar
Abstract: The construction of digital radar simulation systems has been a research hotspot of the radar field. This paper focuses on theoretical analysis and simulation of multi-target echo signals produced in a phased array radar system, and constructs an array antenna element and a signal generation environment. The antenna element is able to simulate planar arrays and optimizes these arrays by adding window functions. And the signal environment can model and simulate radar transmission signals, radar internal noise, clutter and jamming signals. These signals are combined linearly to generate the radar echo signal. The simulation results indicate that multi-target echo signals are completely overwhelmed by other signals, satisfying the needs of subsequent signal processing and data processing.
(3)Liang Hu, China University of Mining and Technology (Beijing), China
Title: Fault Diagnosis for Constant Deceleration Braking System of Mine Hoist based on Principal Component Analysis and SVM
Abstract: Based on AMESim simulation platform, the pressure-time curve of the constant deceleration braking system is obtained in this paper firstly, by simulating three typical faults of brake, spring stiffness decreases, the brake shoe friction coefficient decreases and brake leaking. Then pressure data on the curve for each time are seen as a variable and the curve is chosen as the fault sample, analyzed by the method of Principle Component Analysis (PCA). Last, principal components or sum of variance contribution rates more than 95% are selected as sample eigenvalues and Support Vector Machine (SVM) is taken for fault diagnosis. Diagnosis results show that all testing faults can be identified accurately, which indicates SVM model has a very good ability to identify the fault. To further verify the performance of SVM for fault identification, BP neural network is established to compare. The results show that SVM model is more accurate than BP neural network for fault recognition.
(4)Yifan Jia,Tianlu Zhang, China University of Mining & Technology (Beijing),China
Title: Numerical investigation on the effect of labyrinth seal configuration on leakage
Abstract: Labyrinth seals have been widely used in rotating machines. In this paper, labyrinth seals with rectangular tooth used in seawater pump with axial flow distribution were studied. The effects of structure parameters of labyrinth seals on sealing performance were numerically studied by the commercial computational fluid dynamics (CFD) software. The sealing length was considered as a constant, while the cavity width, cavity depth, tooth width and pressure ratio were varied. A large number of models were calculated to study the effects of various variables on leakage of labyrinth seals. Firstly, the results show that the effects of the cavity depth on leakage could be ignored compared with that of the cavity width and sealing length. Secondly, the optimal labyrinth seals with lowest leakage can be obtained with the appropriate values of cavity widths. Furthermore, for a certain pressure ratio, the optimal cavity widths resulting in the lowest leakage were demonstrated to be stable irrespective of the values of cavity depth and sealing length. Finally, increasing pressure ratio gives rise to an increase in the optimal cavity width. It reveals that the higher the pressure ratio is, the longer the cavity width is needed to reduce the leakage.
(5)Haibiao Luo, Institute of Software Application Technology, Guangzhou & Chinese Academy of Sciences, China
Title: Design of a Distributed Food Traceability Platform and Its Application in Food Traceability at Guangdong Province
Abstract: Food traceability is an important measure to secure food safety. This paper designed a food traceability platform based on distribution framework and implemented it in Guangdong province. The platform can pro-vide traceability service, production and management service for food enterprise, provide forward and backward traceability of the whole cycle of food production and circulation, and provide various methods of food traceability for public. One characteristic of the platform is that it opens up the data flow among production, circulation and supervising departments, and builds a unified commodity circulation data pool. Based on the flow data pool, not only the production and circulation information of the food product can be traced, but also its inspection and quarantine information. Another characteristic of the platform is that its database and data interface were developed based on the fool electronic traceability standards formulated by the National Food and Drug Administration. Its interface standardization and compatibility with other food traceability platforms can thus be guaranteed. The platform is running at Guangdong province. Key supervising products of Infant formula foods (including milk powder, rice flour, farina, etc), editable oil and liquor are traceable by this platform. The public can use the Guangdong food traceability portal, mobile APP, Wechat or the self-service terminals in the supermarkets to trace food products by scanning or input its traceability code or its product code, and query information about food enterprise license, inspection and quarantine, market and circulation, etc. For product with traceability code, its authenticity can be verified. It will help to provide health safety to the public and promote consumer confidence.
（6）Gesi Meng,University of Posts and Telecommunications, Beijing, China
Title: Finger vein recognition based on convolutional neural network
Abstract: Biometric Authentication Technology has been widely used in this information age. As one of the most important technology of authentication, finger vein recognition attracts our attention because of its high security, reliable accuracy and excellent performance. However, the current finger vein recognition system is difficult to be applied widely because its complicated image pre-processing and not representative feature vectors. To solve this problem, a finger vein recognition method based on the convolution neural network (CNN) is proposed in the paper. The image samples are directly input into the CNN model to extract its feature vector so that we can make authentication by comparing the Euclidean distance between these vectors. Finally, the Deep Learning Framework Caffe is adopted to verify this method. The result shows that there are great improvements in both speed and accuracy rate compared to the previous research. And the model has nice robustness in illumination and rotation.
(7)Zhongxi Zhu, National Engineering Laboratory of Petroleum Drilling Technology, Yangtze University, China
Title: Factory-like Optimum Drilling Design of Cluster Well in Jimsar Well Block
Abstract: The deep heavy oil reservoir of Jimsar well block, located in Xinjiang oilfield was developed by cluster well in 2016. In view of the ground environment, long open hole section and poor wellbore stability, a research was carried out for factory-like wellsite platform deployment, well trajectory design and reservoir protection. Firstly, the platform was divides into different control regions according to the anti-collision requirements. Secondly, truck-mounted drilling rig and city power were applied to the factory-like drilling. Thirdly, well track was designed to be three parts with straight- increase- steady to improve the proportion of composite drilling footage. Fourthly, the method of plane scanning and normal surface scanning was adopted to ensure the safety of downhole trajectory. Finally, the natural polymer drilling fluid system and drilling fluid reuse system were used to protect environment and reduce drilling cost. The results show that the maximum reducing time of single drill rig is 32.5 day and the penetration rate of whole platform is increasing continuously.
(8)Jihui Wang, Science and Technology on Underwater Test and Control Laboratory, Dalian, China
Title: Numerical simulation of underwater acoustical field with directional sources based on the normal modes model
Abstract: In this paper, beamforming and normal modes method are combined to calculate the underwater acoustical field. Firstly, beamforming technology is used to form directional sources by controlling the phase and relative amplitude. Secondly, considering the ocean speed, surface and bottom boundary, the point source sound field is calculated based on the normal modes model. Then underwater acoustical field with directional sources is achieved by adding all point source field. Taken the 11 elements vertical linear array as an example, the special directional source is formed by chebyshev amplitude weighting, and then underwater acoustical field is calculated in the Munk profile of different grazing angles. The results indicate that beam grazing angle is very essential to sound field, and changing the grazing angle can enhance the sound intensity of the shadow zone correspondingly.