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The air flow with sand produced in deep water gas wells has a high flow rate, causing the erosion of screen to be more serious, which is easy to cause sand control failure, affect production and aggravating the cost of workover. In order to accurately monitor the erosion of sand control screens in deep water gas wells, it is more practical and valuable to use the short-time, low-cost simulation experiment to research. In this paper, the overall geometric model of the screen and the geometric model of the pore are constructed, and they can be modified in stages to match the change of pore size during the erosion process. The multi -angle screen erosion model of discrete particles is established and the gas-solid coupling flow model is introduced. The sub-relaxation iteration is used to iteratively calculate the two-phase flow field distribution and the erosion rate of the screen, and a simulation method of screen erosion is formed by applying the XX well for erosion analysis. The simulation experiment of sand control screen erosion proposed in this paper provides a research method and theoretical basis for the optimization of sand control screen and the calculation of erosion rate in deep water gas wells, which is of great significance for ensuring the safe and efficient development of marine oil and gas resources. [ABSTRACT FROM AUTHOR]

The modeling and synchronization control experiments of the Lorenz chaotic system are carried out by using Matlab/Simulink software. According to the differential equations of the Lorenz system, four methods are used to model and simulate respectively, and these methods are analyzed. By using the state linear feedback control, the synchronous control experiment of the Lorenz chaotic system is designed to realize the synchronization control of the two Lorenz chaotic systems. The simulation experiment can deepen the students’ understanding of the chaotic system modeling and synchronization control, and provide a new way for chaos theory and experimental teaching. [ABSTRACT FROM AUTHOR]

The system comprehensive experiment plays an important role in radio frequency circuit experimental teaching. In order to design suitable and professional experimental projects, we attempt to integrate teachers’ research into teaching, and design the simulation experiment of High Frequency Radar Receiver Based on ADS. With the design of high frequency surface wave radar( HFSWR) system and the requirement of design, this experiment asks students to complete the design and model of RF system based on the behavior function module of simulation software, and then assess the performance of the system from the important characteristics of the receiver such as sensitivity, gain, frequency selectivity coefficient and dynamic range. The results show that theory and practice are combined effectively in this experiment, which is helpful to cultivate students’ capacity in parameter analysis from application background, stimulate students’ interest in RF engineering, improve the students’ ability to analyze and solve practical problems, and achieve the desired effects. [ABSTRACT FROM AUTHOR]

Simulation experiment is the necessary means of higher education and scientific research, and is an effective supplement to the traditional experimental methods. Two tests have been done. On the basis of these, and relying on scientific research projects of " A Prefabricated Steel Truss-concrete Composite Beam", a simulation experiment was done in this paper. The result shows that the concrete decks have great damage for the horizontal studs slip distribution along the beam length. It will make the cross section of pure bending section without shear slip, and will make the stud slip direction change. It is worth noting in the later theory research. And through the simulation experiment, the ability of students’ simulation modeling and calculation is cultivated, which can effectively improve the teaching quality and the ability to solve scientific research problems. [ABSTRACT FROM AUTHOR]

Mobile wireless network is an important part of educations of electronic and information engineering, and the experiments of large scale mobile wireless networks consist of many hardware resources, it is a big economy burden for colleges and universities. A simulation and experimental platform of mobile wireless network based on the virtualization technology is proposed to resolve the problem, virtualization technology is adopted. The processes are used to simulate network devices, and each virtual machine supports several processes, so that a physical host can simulate a big amount of network devices. The structure of network topology and the parameters of network linkage can be customized by user, so that it provides rich choices for experimental lessons. Besides, the virtual network devices can join or leave the network topology dynamically, it satisfies the simulation demand of mobile wireless networks. Results verified and analyzed by two groups of network experiments show that the proposed simulation platform performs an accurate simulation to mobile networks and static networks, and it resolves the problem of limited hard resources of laboratory. [ABSTRACT FROM AUTHOR]

Lind eractuated robot Pendubot with two degrees of freedom has strong nonlinearity and strong coupling. It is usually used as teaching and research platform of nonlinear control and robot. The dynamic functions of Pendubot are highly abstract and complex. To improve the classroom teaching quality, simulation and control experiments arc built based on MATLAB/Simulink according to Pendubot’s dynamic functions. It can operate balance control at the highest unstable equilibrium position using linear quadratic regulator (LQR). Students can modify the system parameters, do dynamic simulations and observe the results. It can realize the combination of theory and experiments. It can stimulate students’ learning enthusiasm and help to cultivate students’ operational ability and innovation ability. [ABSTRACT FROM AUTHOR]

The structure characteristics and working principle of HSK and BT tool systems were expounded. From the perspective of comparative analysis, based on the NX Nastran platform, this paper took HSK-A32 and BT^fO, two typical tool holders, as representatives to study radial expansion and axial displacement in high speed cutting conditions by simulation experimented. The data obtained were compared and analyzed. The experimental result indicated that the HSK tool system was better than BT tool system in radial expansion and axial displacement in high speed cutting. Data provided take support for further research and application of HSK tool system. [ABSTRACT FROM AUTHOR]

The direct linear transformation ( DLT) analysis in vehicle speed identification is an effective application in traffic accident reappearance. But the method exists considerable errors yielded by both systematic error and accidental error. This article offers a modification model for the DLT vehicle analysis based on a research of errors in the application of original model. The compensation analysis applies simple principles and easy calculation. The consistence between the lest results of ibis modified model and llie simulation experiments indicates ihe correctiveness and applicability of ihe model. This modified model greatly improves the accurateness of DLT vehicle speed analysis and extends the application of speed identification. [ABSTRACT FROM AUTHOR]

This article is based on the two-layer VLAN simulation experiment, expounds the concept, the division method and the interface type of VLAN. In view of the lack of three-layer routing devices in the LAN, starting from two-layer VLAN on the traditional teaching experiment, the article designs three experiments i.e., the across switches VLAN, Mux VLAN, asymmetric VLAN. Using the eNSP software, simulation is used to achieve the three experiments on the two-layer VLAN. The article shows the detailed design method and the configuration process, and makes the validation and analysis the result of the experiment. Experiments show that in the absence of three-layer routing devices, the two-layer VLAN can also realize the communication and isolation between different network segments, can be used on a specific network environment. The experiment lets the student better grasp the VLAN technology from theory and practice. [ABSTRACT FROM AUTHOR]

In order to make students touch professional scientific frontier and better train their scientific research and innovation abilities, the research of transient evaporation rate of LNG storage tank is introduced into experimental teaching, the study on simulation experiment of transient evaporation rate of LNG storage tank based on FLUENT is carried out. The simulation experiment with FLUENT can present the changing rules of the evaporation rate of LNG under fill depth, temperature, variation of the inner diameter of LNG storage tank intuitively. The experiment can promote students' understanding. The teaching effect can be improved by the teaching experiment combined the teaching with scientific research. It is beneficial to improve students' ability of simulation, motivate students' scientific curiosity and cultivate students' ability to solve scientific research problems by experiment. [ABSTRACT FROM AUTHOR]

Sloshing in tank of ship is one of the difficulties of fluid mechanics. In order to make students fully understand the theoretical knowledge of sloshing in independent type C tanks, a numerical computational model is established for the complex nonlinear sloshing in independent type C tanks, and a simulation experiment is designed based on FLUENT. Simulation experiments are carried out under different conditions of sloshing. The simulation experiments with FLUENT can promote students’ understanding of theoretical knowledge of sloshing, make students learn the basic knowledge of computational fluid dynamics and master the computing method for sloshing load. It is beneficial to improve students’ ability of simulation, motivate students’ scientific curiosity and cultivate students’ ability to solve practical research problems. [ABSTRACT FROM AUTHOR]

Combined with school’s graduate course of modern communications systems, an expanding content of reception technology of small delay multipath signal is designed. In underground tunnel environment, small delay multipath signals are dense, therefore multi-path fading in a mine tunnel is more severe than that in open environment. It leads to sharp declines in quality of wireless communication and a unwanted limited in communication distance. In order to inhibit multi-path fading in tunnels, the diversity reception technology of small delay multi-path signal was discussed. This paper proposed the CFOC-MN delay estimation algorithm for heavy background noise to improve the traditional HAKE receiver, which transformed the dense multi-path signal. The delay spread was at ns level. Simulation results show that the performance of RAKE diversity receiver can effectively improve the SNR of received signal, and can achieve the effect of extending the reliable communication distance. [ABSTRACT FROM AUTHOR]

In order to make students touch professional scientific frontier and better train their scientific research and innovation abilities, the research of the hold frame structural strength of LNG carriers is introduced into experimental teaching, the study on simulation experiment of the hold frame structural strength of LNG carriers based on ANSYS is carried out. The simulation experiment with ANSYS can be used to research the hold frame structural strength of LNG carriers. Fourteen full load conditions and 14 ballast conditions are chosen to simulate the hold frame structure stress and deformation of LNG carriers. The high stress parts can be found to provide the guidance for the improvement of the hull structure. The teaching effect can be improved by the teaching experiment combined with the teaching and scientific research. It is beneficial to improve students' ability of simulation, motivate students' scientific curiosity and cultivate students' ability to solve scientific research problems by experiment. [ABSTRACT FROM AUTHOR]

Aiming at the characteristics of the strong theoretical property of the curriculum and the lack of intuitive experiments in the teaching of microwave technology, this paper proposed the adoption of the electromagnetic simulation software HFSS in the practical teaching process. The microwave devices simulation design experiments using HFSS software can implement the organic combination of theory teaching and practical teaching. The microwave devices simulation examples based on HFSS can make the teaching interesting and lively and help students comprehend the difficulties, hence, it can help students understand the structure, field distribution of microwave devices and master the design method of microwave devices. The gained teaching effects have shown that the introduction of the HFSS simulation experiments can improve the learning interest and engineering practice ability of the students and strengthen autonomous learning ability and innovative thinking ability of the students. The experiments play a significant role in promoting the comprehensive quality of students. [ABSTRACT FROM AUTHOR]

Because the traditional particle swarm optimization (PSO) algorithm is apt to fall into the local optimum, chaos optimization was introduced to form chaotic particle swarm optimization (CPSO) to reduce the possible of falling into the local optimum for particles. Moreover, based on CPSO, the crossover operator of differential evolution (DE) algorithm was combined to increase the diversity of particles and the possible of obtaining a better solution. The new algorithm is named improved particle swarm optimization (IPSO). In order to verify the effectiveness, PSO, CPSO and IPSO algorithms have been examined and tested in IEEE30 bus test system for solving reactive power optimization based on Matlab software, respectively. Simulation results show IPSO method can find the solution with higher quality and better convergence, which demonstrates the superiority of improvement of algorithm. The simulation experiment not only-can strengthen students’ ability of utilizing simulation software, but also can deepen their understanding for reactive power optimization and intelligent algorithms. Thus the quality of teaching is improved effectively. [ABSTRACT FROM AUTHOR]

Due to the grim pollution situation, environment subject in China faced on unprecedented challenges and also opportunities. Since the experimental site is lack,experimental class and the capacity are limited,it is difficult to present the good experimental items, especially, those can reflect the latest advances of the research achievements. The virtual simulation experiment teaching has an important application in the field of education, and is an important part of education informationization. However, the application of simulation experiment in the current experimental environment of teaching is limited. It is significant to carry out the construction of simulation experiment teaching in time, which can be a complement of real experiment teaching. The development of simulation experiment teaching should focus on the aspects of experimental system, experimental content, software development and management system, so as to improve the construction of the national experimental teaching demonstration center. [ABSTRACT FROM AUTHOR]

Patch-clamp amplifier is used to measure the ion channel transmembrane currents generated by charged ions passing through the cell membrane, the equipment is costly. The application of patch clamp ion channel measurement in undergraduate teaching is restricted by the teaching budget. The computer simulation technique was used to simulate the experimental operating environment, and the measurement of the sealing resistance detection circuit was carried out. The hardware system of the instrument adopted the movement of the negative pressure syringe to drive the resistance variable of the sealing process. The software system used MSP430 monitoring software and microcomputer display analysis and processing software. Finally, the experimental equipment of ion channel current simulation of cell membrane was developed. The application of this instrument achieved the purpose of conducting experimental teaching of ion channel current measurement, and better promoted the students to master cell membrane ion channel current detection technology. [ABSTRACT FROM AUTHOR]

Based on a platform and three centers, the course of Macromolecule Materials Processing Experiment has been reformed actively. Three levels of the experiment have been formed by developing and enriching the environmental friendly and innovating research oriented experiments. A website which can reflect preliminarily MOOCs and 3D printing and other new technology has been established. The preparation before class, and the interactive teaching such as paper communication and discussion, and hardware and culture have been strengthened. The method of experiment examination has been reformed and diversified by establishing the professional experiment testing bank. To serve local industry, the united mode of production-study-research has been established. Through these ways mentioned above, the goal is to establish the boutique resource sharing course of Macromolecule Materials Processing Experiment, and set up a science technology services and teaching platform of 3D printing with macromolecule materials gradually. [ABSTRACT FROM AUTHOR]

It is known that the control of water turbine regulating system is difficulty since its complicated structure. On the basis of traditional PID control, a parameter control scheme of hydro turbine governor is proposed to realize the real-time and on-line adjustment of PID parameters for this system based on fuzzy adaptive PID control. According to the different influence on system performance produced by the three PID parameters, we have completed the design and programming of the fuzzy adaptive PID controller with Matlab based on the mathematical model of water turbine regulating system. The proposed fuzzy adaptive control scheme and Ziegler Nichols algorithm are simulated under different frequency disturbance. The experimental results show that the fuzzy adaptive control scheme is an effective parameter setting method for water turbine governor. This method makes the system obtain better dynamic performance compared with Ziegler Nichols algorithm. [ABSTRACT FROM AUTHOR]

In order to help students grasp and master power flow calculation, the application of MATpower in experiment teaching of power flow calculation has been studied. In this paper, a simple power system is designed. Its structural parameters were introduced; the specific implementation of power flow calculation based on MATpower was explained in detail; and the result sets of data were analyzed. The simulation result reveals that the designed power system and the programming of power flow calculation are correct. The veritably reflects the attribute of varied variables and internal rules in power system. Through this process, problems needed to be noticed in learning power flow calculation are intensified and the understanding about power flow calculation gets enhanced by students. The system yields the theory and experiment teaching of power flow calculation of great significance. [ABSTRACT FROM AUTHOR]

The experiences of application of the national virtual experimental teaching center and the construction of civil engineering virtual experiment center in Beijing University of Technology were summarized in this paper. The virtual experiment platform held technical features of networking, three-dimensional, immersive, and interactive construction. It could combine with FEM software. The development directions of virtual experimental technology would combine with remote test, hybrid test. The studies of this paper have reference valuable for the development of virtual experimental teaching center in related universities. [ABSTRACT FROM AUTHOR]

The Matlab/Simulink simulation platform is introduced in photovoltaic generation experiment in order to solve the problem of lack of courses-related experimental conditions. After doing simulation experiments of photovoltaic generation under partial shading, the authors sum up the considerations of such experiments. The results showthat those experiments will play positive effects. This provides a new experimental teaching approach and method for the experimental teaching of photovoltaic technology related courses. [ABSTRACT FROM AUTHOR]