Henan Mechanical and Electrical Vocational College
Henan Mechanical and Electrical Vocational College
Song-Juan Z.,Nanyang Institute of Technology |
Jian Y.,Henan Mechanical and Electrical Vocational College
International Journal of Interactive Mobile Technologies | Year: 2016
In order to solve the problem of large scalability and low energy efficiency in distributed data storage in wireless sensor networks, the author proposed a temporalcentric storage approach method. By using this method the sensing data are stored in some storage node indexed by a hash function parameterized with detecting time. These nodes act as rendezvous among sink and source nodes. Simulation results show that the proposed approach mitigates the hot-spot problem and can thus improve overall system performance substantially.
Wang Y.,Beijing Institute of Technology |
Wang Y.,Henan Mechanical and Electrical Vocational College |
Mao W.,Henan Mechanical and Electrical Vocational College |
Zhang L.,Henan Mechanical and Electrical Vocational College |
Li Y.,Beijing Institute of Technology
Journal of Alloys and Compounds | Year: 2017
A phenomenological theory to model spall strength in middle carbon steel was proposed by using empirical electron theory of solids and molecules (EET). Under plate impact load (strain rate, 105–106 s−1), valence electron structure (VES) of α-Fe, α-Fe-C, and ε-Fe3C phases have obvious change than quasi-static load (strain rate, 10−3–10−2 s−1). Theoretical spall strength of ASTM1045 were calculated at plate impact pressure range of 5.37–8.17 GPa. Experimental spall strength were experimented by using 57 mm-diameter, 12.5 m-long single-stage gas gun and velocity interferometer system for any reflector (VISAR). The relative error of theoretical and experimental spall strength is less than 7.6%. © 2017 Elsevier B.V.
Xu B.,North China University of Water Conservancy and Electric Power |
Li R.,Henan Mechanical and Electrical Vocational College |
Fu H.-H.,Huazhong University of Science and Technology
Chinese Physics B | Year: 2017
We investigate electron transport through HgTe ribbons embedded by strip-shape gate voltage through using a nonequilibrium Green function technique. The numerical calculations show that as the gate voltage is increased, an edgerelated state in the valence band structure of the system shifts upwards, then hangs inside the band gap and merges into the conduction band finally. It is interesting that as the gate voltage is increased continuously, another edge-related state in the valence band also shifts upwards in the small-k region and contacts the previous one to form a Dirac cone in the band structure. Meanwhile in this process, the conductance spectrum displays as multiple resonance peaks characterized by some strong antiresonance valleys in the band gap, then behaves as Fabry-Perot oscillations and finally develops into a nearly perfect quantum plateau with a value of 2e2/h. These results give a physical picture to understand the formation process of the Dirac state driven by the gate voltage and provide a route to achieving particular quantum oscillations of the electronic transport in nanodevices. © 2017 Chinese Physical Society and IOP Publishing Ltd.
Wu Y.,Henan Mechanical and Electrical Vocational College |
Cheng L.,Zhengzhou Nissan Automobile Co. |
Fan G.,Zhengzhou University of Light Industry |
Wang C.,Zhengzhou University of Light Industry
Applied Mechanics and Materials | Year: 2014
The kinematics equation of the handling robot with six free degrees has multiple sets inverse solution, and the robot system only can choose one optimized solutions to drive the robot to work. The kinematics model of the robot is established by D-H method, and the inverse solution is derived by an algebraic method. The best flexibility principle was introduced to determine a set of optimal solutions from 8 sets of feasible solutions. The correctness of robot inverse solution method is verified through a set of calculation examples. © (2014) Trans Tech Publications, Switzerland.
Chen D.Z.,Henan Mechanical and Electrical Vocational College |
Jia L.J.,Henan Mechanical and Electrical Vocational College
Applied Mechanics and Materials | Year: 2014
The key technology of electric vehicle battery management lies in the battery state of charge (SOC) estimation, accurate and efficient estimation of SOC can provide the reference data for the control system of the electric vehicle in time. On the basis of the Ah measurement method, Calman filtering method, open circuit voltage method to estimate method, the estimation procedure to estimate the charged battery optimized Calman filtering method, effectively shorten the calculation process, improve the estimation accuracy, in the normal operation of electric vehicles under the influence of comprehensive consideration about the discharge voltage, battery temperature to estimate the state of charge, the Calman filter optimization algorithm, and its application in the electric vehicle battery management system. The experimental results show that, the algorithm can calculate the real-time high charge state of surplus value, provides a set of effective estimation scheme of calculating the battery charge state.The core content in the electric vehicle battery management system is determined by supervision and management of the battery residual capacity. SOC index can be used for real-time monitoring of the battery residual capacity, meanwhile, SOC provide necessary reference data for ECU as the enforcement basis of battery management system. At present, the estimation method for the power battery SOC as followed: the discharge experiment, discharge method, Ah measurement method, combining with the open circuit voltage, load voltage, internal resistance method, neural network and kalman filtering method, etc., the internal resistance method is used to detect charged state, which required battery remaining power less than 40% of the rated power, then it can monitor the change of battery internal resistance, so can't fully test battery. The battery must be placed for a period of time, when using the open circuit voltage method test the SOC. The battery remaining capacity can be estimated after the stability of the battery voltage. Therefore, this method can’t be applied to the working battery, at the same time, the open circuit voltage method can't timely monitoring battery internal chemical aging and have a large error on estimation of the battery remaining capacity, which deviated from the basic reference value. Ampere hour measurement is to estimate the remaining battery power by the integral battery current, however, due to the battery current change is too big during the driving process, caused big error estimation. Based on the open circuit voltage method and Ah measurement, a kalman filtering optimization algorithm was proposed by this paper, finally the feasibility of the optimization algorithm is verified by experiment. © (2014) Trans Tech Publications, Switzerland.
Sun Z.,Henan Mechanical and Electrical Vocational Group |
Wang X.,Henan Mechanical and Electrical Vocational College |
Zai S.,Henan Mechanical and Electrical Vocational College
Advanced Materials Research | Year: 2011
The present rear-end collision accident proportion on the road increases day after day, car collision avoidance system is more and more paid attention. Analysising the existing car collision avoidance system, we propose a car anti-collision algorithm based on safe distance model in this paper. This method takes the influence factors of safety distance for main parameters which fully considers the speed change and the acceleration change of the car 1 and the car 2. It may realize real-time information acquisition and warning judgment according to the state of car 2, the car could automatic braking if necessary. VB simulation shows that the algorithm can effectively avoid collision, also automatically maintain the distance between vehicles, and lay a foundation for further research on the unmanned car. © (2011) Trans Tech Publications.
Xiao H.,Reliability Research and Analysis Center |
Luo D.,Reliability Research and Analysis Center |
Wang Q.,Henan Mechanical and Electrical Vocational College
16th International Conference on Electronic Packaging Technology, ICEPT 2015 | Year: 2015
It is essential to understand that excessive strain usually results in various failure modes for printed circuit board assembly (PCBA) products. However, it is often difficult to measure the true strains of the critical component solder joints' connections on PCBAs directly. Based on analysis of the basic principle for strain gage test technology and strain-induced damage phenomena of PCBAs, this article studied on the application of strain measuring technology in reliability evaluation of PCBA under manufacturing process. Moreover, combining with an applicative example of strain measurement during mechanical assembly, systematic analysis was conducted on the strain gage selection technology for PCBA, specific operation method of strain gage tests during PCBA assembly process and strain data analysis method, in order to make further improvement on strain evaluation methodology in electronic industry. © 2015 IEEE.
Su Q.,Henan Mechanical and Electrical Vocational College |
Wang X.,Henan Mechanical and Electrical Vocational College
Applied Mechanics and Materials | Year: 2012
Simulating and analyzing the kinematics model of double crank-slider mechanism with Simulink tools of MATLAB platforms.The mechanism is a system that its kinematic equations can construct the simulation model,and its initial position may determine the relevant parameters of the model,by this way can obtain the simulation results of the kinematic parameters.Finally, take the main transmission mechanism of the the platform printing machine as an example to verify the accuracy and effectiveness of the proposed method. © (2012) Trans Tech Publications, Switzerland.
Wu L.,Anhui Normal University |
Ji W.,Henan Mechanical and Electrical Vocational College
International Conference on Geoinformatics | Year: 2013
Based on Landsat ETM+ remote sensing data and historical geography analysis, this paper studied structural characteristics and driving factors for polder (artificial dike-surrounded field) landscapes in the East Chaohu Area of Anhui Province, China. According to the characteristics of polder structure and spectral analysis of typical objects, differential methods were used to gain structural characteristics of polder landscape in this area. The results indicated that the spatial structural characteristics of polder landscape could be divided into six categories: polygon-shaped structure, jaggies-shaped structure, dendritic-shaped structure, feather-shaped structure, cricoid fan-shaped structure, and rectangular-shaped structure. All six landscape structures were formed by the long-term human exploitation of farmland, reflecting different natural and social functions of polder's construction. Finally, combined with regional environment and historical literature, this paper synthetically analyzed the five main driving factors of this artificial field development. © 2013 IEEE.
Wang Q.H.,Henan Mechanical and Electrical Vocational College |
Zhao F.X.,Zhengzhou University
Advanced Materials Research | Year: 2013
To resolve the problems of small module gear measurement with traditional methods, a new method for measuring the tooth profile deviations of small module gear using the optical image measuring instrument is put forward. According to the ISO 1328-1, the mathematical models of total profile deviation, profile form deviation and profile slope deviation are proposed. The involute profile measurement schemes are given. The results show that tooth profile coordinate values of small module gear can be measured automatically and effectively with the optical image measuring instrument, and the provided method has higher precision of getting measuring points and less fitting error of tooth profile. © (2013) Trans Tech Publications, Switzerland.