Hunan Railway Professional Technology College

Zhuzhou, China

Hunan Railway Professional Technology College

Zhuzhou, China

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Tao Y.,Hunan Railway Professional Technology College
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

A control method of DFIG wind power system is discussed in this paper. Since the large rotational inertia of the wind turbine, and the low speed variation of it, the speed of wind turbine can be seen as constant in a short interval. By measuring the EMF of rotor, control the rotor side inverter injecting the current into rotor with proper phase and frequency, the power and the reactive power of the machine can be controlled. Control equation and block are given. Simulation and experimental result verify the rightness of the method. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.


Shuhua D.,Hunan Railway Professional Technology College
RISTI - Revista Iberica de Sistemas e Tecnologias de Informacao | Year: 2016

With the rapid development of aviation electronics technology and mature applications of computer technology, high-end computer products combined with digital electronic technology and virtual instrument technology have become a major characteristic research direction in the field of aerospace. An airborne computer is the core equipment in the avionics system that provides a hardware platform for data processing and transmission and interface software and application software for subsystems. Test systems can automatically collect, analyze data and generate test reports, which can reduce the workload of testers and improve test speed and accuracy. In order to improve integration testing performance of airborne computers and improve the portability of test equipment, a test system for airborne computers based on PCI data acquisition cards and virtual instruments is developed. According to the test functions of an airborne computer testing system, hardware configuration of the testing system is analyzed and given to test the reliability of the system. An actual testing analysis shows that the system has low failure rates, more than 2000 mean time between failures and pretty high reliability.


Chen Y.,Hunan Railway Professional Technology College
Advanced Materials Research | Year: 2014

Multimedia computer assisted English learning has been widely used with the development of information technology. This new technology has many advantages in improving the students' learning efficiency and teachers' quality. In this article, the applications of multimedia computer assisted language learning in English teaching such as phonetic teaching, conversation presentation, text presentation, background introduction and practice strengthening are analyzed. The possible problems in English teaching and countermeasures are also introduced. © (2014) Trans Tech Publications, Switzerland.


Li H.,Hunan Railway Professional Technology College
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

In order to achieve the goal of online condition monitoring of high voltage insulator, its power supply of high voltage insulator parameters online monitoring system is one of the key problems, and it requires that the power has the characteristics of long-term free maintenance, high reliability and stability. This paper designs photovoltaic power supply of battery and super capacitor hybrid energy storage, and puts forwards energy management strategy according to the characteristics of the load and energy storage system. Photovoltaic power generation system adopts one-way DC/DC converter for maximum power control and bi-directional DC/DC converter to achieve super capacitor and battery's energy bi-directional exchange with the system. The results show that the control strategy can maintain stability of the DC bus voltage when the output power of photovoltaic battery fluctuates, and can effectively reduce the cycle times of charge and discharge of the battery, optimize charge and discharge performance, prolong the service life, and ensure maximum uninterrupted power supply. ©, 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved.


Zhu L.Y.,Hunan Railway Professional Technology College
Advanced Materials Research | Year: 2014

With the rapid development of information technology, using computers to assist English teaching has become an important method. The advanced network technology can optimize English teaching mode, improve English teaching quality, meet the personalized requirements of English learners and improve students' English application ability. This article introduces the system structure of English network teaching. On the basis of this structure, the optimization principles and methods of English teaching under network environment are analyzed. The optimization principles mainly include the most optimization principle, the compatibility principle, the personalized teaching principle, the autonomous learning principle and the interactivity principle. The optimization methods include the optimization of teachers and students. © (2014) Trans Tech Publications, Switzerland.


Tang Y.P.,Hunan Railway Professional Technology College
Advanced Materials Research | Year: 2014

This paper introduces the research and design of a light moisture tester. In the coal quality analysis field, moisture test most of the use of infrared heating pipe heating or drying box to measure, low heating rates, nitrogen through a single mode, before heating furnace uniform nitrogen filled with test conditions and have the test conditions, the same way caused by nitrogen, nitrogen waste. Based on this study, the heating pipe comprises an infrared tube into a light tube, the heating rate is improved; the general nitrogen control size flow switching mode using 2.5min before the experiment, large flow quick heating furnace filled with nitrogen, achieved through experimental conditions drying nitrogen, open a small flow, keep the atmosphere. The improved design of a light moisture meter analysis of water air drying method precision test, analysis of water air drying method accuracy experiments, 6 water - air drying method of precision experiment, 6 water - air drying method accuracy experiments, analysis of water through nitrogen drying method precision experiment, analysis of water. Nitrogen drying method accuracy experiments, ¢ 6 full water through nitrogen drying method precision experiment, ¢ 6 full water through nitrogen drying method accuracy experiments, results in line with national standard test, repeatability. © (2014) Trans Tech Publications, Switzerland.


Shu J.,Hunan Railway Professional Technology College
Proceedings - 2016 8th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2016 | Year: 2016

English Language teaching evaluation is the inner requirement of vocational college English teaching reform. This paper analyzes the present situation and the existing problems of classroom-based evaluation system of ELT in higher vocational college and accordingly puts forward five principles of establishing this evaluation system, constructs a multi-level evaluation index system of ELT in higher vocational college, finally puts forward to establish and improve the online evaluation system on the basis of modern network technology. © 2016 IEEE.


Xiong L.,Hunan Railway Professional Technology College
Applied Mechanics and Materials | Year: 2014

In 2007, the Ministry of Education published the "requirements" for college English teaching, the College English teaching reform has been further popularized, and the requirement of each big university English asked the teachers to improve the level of teaching constantly, so as to cultivate students' comprehensive ability of using English and enhance their abilities of autonomous learning. In order to improve the students' comprehensive cultural literacy and meet the needs of our society and the international exchange, the reform of teaching mode as well as the construction and application of college English teaching can provide us a new teaching mode through network,which can gradually forme a network of autonomous learning teaching mode. © (2014) Trans Tech Publications, Switzerland.


Shi J.Y.,Hunan Railway Professional Technology College
Applied Mechanics and Materials | Year: 2014

Port plate is one of the key parts in axial piston motor. The main researching object of this paper is the port plate of axial piston motor. According to different positioning ways of the port plate, the strength of port plate is calculated by the finite element software ANSYS. From the results of the analysis, certain suggestions are also provided to help further positioning ways design of the port plate of axial piston motor. © (2014) Trans Tech Publications, Switzerland.


Xiao Y.,Hunan Railway Professional Technology College
Applied Mechanics and Materials | Year: 2014

Traditional classroom English teaching model, multimedia and network aided English teaching mode as brought many good to the English teaching and learning but there are also some problems. English teaching should be guided by scientific theory of education, to change the traditional teacher-centered teaching learning mode, constructing the hybrid teaching mode which integrates multimedia and network technology into the traditional classroom English teaching, in order to better hair with the teacher's leading role and students' cognitive main role. © (2014) Trans Tech Publications, Switzerland.

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