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Ethyl acetate (EtAc) is mainly used as solvent in paints and coatings industry, inks production and as industrial solvent in many other branches of industry. Esterification of acetic acid with ethanol may be performed to synthesize ethyl acetate. In this paper, a reactive distillation (RD) column with packing cation exchange resins as a catalyst is applied. Mathematical models of reactive distillation...
Porosity is quite significant for the characterization and prediction of transport properties. To simulate the porosity values, a porosity simulation method using Markov model based on cokriging is proposed to simulate the continuous values of porosity. Although cokriging is an unbiased prediction method with minimum prediction variance, original cokriging cannot solve the problem of instability in...
Electrostatic rotary-bell sprayer is widely used for coating conductive substrates. The combination of a high-velocity focusing air, an imposed electric field and charged droplets, leads to higher transfer efficiency than that of conventional spray coating. In this paper, the numerical simulation of the gas flow field of an electrostatic rotated bell sprayer has been obtained by solving the time averaged...
Scratchpad memory (SPM) is commonly used in embedded system because it is more efficient than cache in both performance and energy, and it can satisfy real time requirements as well. A compiler driven method is proposed in this paper to optimally mapping code segments to SPM at runtime. The algorithm uses compiler to identify hotspots in programs based on a greedy cost model, and utilizes DMA transfer...
According to the defects of the XCTD (Expendable Conductivity, Temperature, and Depth) Profiler low data transmission rate and reliability, a modem underwater data transmission system is introduced. The absolute phase-shift demodulated signal of the phase ambiguity problem is overcome by π/4-QDPSK, which is a linear narrow-band digital modulation technique and has high bandwidth efficiency, low bit...
This paper addressed the dynamics and control for completely spatial 6-DOF parallel robots (SPR) in computer. The complex dynamic equations are derived via using Kane methods, and a typical PID controller is developed for spatial 6-DOF parallel robots. Making use of the software of Simulink, the computer model of SPR is built in terms of the dynamic equations of SPR, and the simulation is realized...
Traditional choice models such as the Logit model have suffered practical difficulties in reality. Simulation is an efficient way to solve most of choice problems for it can help make decisions at quite a high speed without loss of accuracy. This paper focuses on the simulation of passengers' choice behaviors within a railway network. Short introductions to a railway passenger's choice behavior and...
Using the harmonic characteristics of output voltage of inverter to design an ameliorative filter which can suppress common-mode and differential-mode voltage at the same time. The simulation is done by MATLAB and the results of the simulation show that long cables are allowed to connect inverter and motor for the filter. By altering the parameters of the filter, the overvoltage in the motor can be...
With the increment of traffic flow, the delay of flights in the TMA area is increased. It is essential that the potential usage of TMA airspace should be excavated. In this paper, SIMMOD PLUS is used for the evaluation of airspace structure of Chongqing TMA, taking Chongqing airport influence and its flow control strategy into consideration. Furthermore, the bottleneck which limits the operation of...
The control function of configuration software is researched and developed based on the application of laboratory project in this paper. A program of the fuzzy control algorithm is designed and simulated. Then the designed fuzzy control algorithm is embedded to the InTouch of the configuration software by the DDE communication protocol. The results show that the dynamic data exchange between InTouch...
The deterioration of worm propagation on internet in recent years has pushed the research in the field of worm defense, as a result there are coming up plenty of worm defense strategies. This paper refers to make the systematic study of the complete worm defense strategies and provide taxonomy of worm defense system strategies according to the key factors of each defense category. As guideline for...
According to a theories of electromagnetism, the electric field and heat generation density distribute affected by the electrode immersion depth was studied in process of electroslag remelting (ESR). The self-adapting meshing method was adopted. The result show that different electrode immersion depth lead to obvious dissimilarity for the electric field and heat generation density distribute. Based...
The mathematical model of double pendulum system is established based on the Newton's laws of motion and is linearized under the approximate condition when the pivot angle is very small. The above model is verified based on the simulation by MATLAB. The controllability and its relationship with parameters of the system is researched. Simulation result shows that the system is controllable when the...
With the development of network technology, computer network is characterized as an uncontrollable, variable and unpredictable infrastructure, this brings great difficulty of verify, defining, debugging and comparing the new schemes. Network simulation technology is proposed to test, appraise, and verify means available. This paper designs and implements an intelligent analyzing tool for NS2 traces,...
This study presents stress analysis of sheave wheel by a finite element analysis model and experimental tests. Simulation of stress field under two kinds of load condition was carried out with ANSYS. The corresponding relationship between stress and load of hoist as well as sheave wheel's phase angle were obtained. Then field experiments of sheave wheel stress under three kinds of conditions, which...
One of the many design and control issues of Automated Guided Vehicles System (AGVS) is the AGV fleet size. This paper presents a new solution method to determining the number of vehicles in the AGVS based on Flexible Manufacturing System (FMS). The approach relies on two procedures-estimate and simulation. With estimate procedure, the mathematic method will be used to estimate the AGV fleet size...
With the rapid development of electronic technology advances, electronic technology is now applied to all walks of life. This paper, based on analogy theoretical principles of water & electricity, a new Dupuit steady well flow simulator is prensented. It is applied to the process of “groundwater dynamics” teaching experiment. It is studied and designed by electronic automation control technology...
In order to visualize the satellite navigation simulation system, the framework of a distributed satellite navigation simulation system composed of multi-platform systems was analyzed. The composition and the functions of the satellite navigation simulation system visualization software were illuminated. Based on MFC, presented the designing and realizing methods of the system information display...
The influence of the orbit control force on the flexible satellite is under consideration. The dynamics model of the satellite with a large solar panel is established via Lagrange equations. The dynamic characters of the system are analyzed. The coupling coefficient matrixes between the motion of the satellite and the flexible vibration are related to the fixing position and fixing angle of the flexible...
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