Search results

By combining CFD numerical simulation [2] technology and system identification principle, the method of least squares embed into Fluent [3] which get transfer function of wood drying kiln control system.
The input of the fuzzy controller are and , output are, , ： ,, (3) (4) Self-tuning process of the controller is shown in Fig.3: Fig.3 Flow chart of fuzzy self-tuning PID program Under unit step role, the simulation results of the fuzzy PID controller and traditional PID controller are shown in Fig.4, Fig.5 by MATLAB: 200 400 600 800 1000 1200 0 0.2 0.4 0.6 0.8 1 1.2 time(s) y Fig.4 Fuzzy-PID simulation curve 200 400 600 800 1000 1200 1400 1600 1800 2000 0.2 0.6 0.8 1 time(s) -0.2 0.4 0 Fig.5 Traditional PID simulation curve Simulation results show that the fuzzy PID control better than the traditional PID significantly in stability, speed, system overshoot.
Journal of North China Institute of Science and Technology.(2010),7 (2):59-63, In Chinese [2] Ruixue Zhang.The drying kiln wind speed testing and modeling and simulation based on the fluid dynamics.
Electronic Industry Press.(2010):33-50, In Chinese [5] YixingYang,DalianCui andAijunZhou.fuzzy adaptive PID controller and Simulink Simulation.

Method Virtual prototyping involves integrated use of computer aided design (CAD), Finite element analysis (FEA)/Computational Fluid Dynamics (CFD) and multi body system (MBS).
It enables simulation of the production systems to the finest details.
The complexities of the simulation process came out of simulation definition which outlines in value of the production process.
Globally recognized definitions of simulation are outlined below.
The simulation model in the Virtual Factory Environment (VFE) includes static and dynamic simulation functions.

In addition, the paper designs the Coanda Effect control switch experiment, which verifies the feasibility of the Coanda Effectcontrol switch action and ensures the generation and implementation of the water hammer effect. 2Two-dimensional model of Coanda Effect control switch 2.1Two-dimensional modeling The establishment of a suitable model isthe key that the simulation result is correct based on fluent simulation.
Coanda trigger control link two-dimensional model 2.2 The 2D mesh based on CFD The 2D Coanda model is established with CFD.
Through the fluent simulation, the separation point of the hydraulic cylinder two branches should take in the distance from the initial separation point 4.5mm~6mm.
Numerical simulation of Coanda Effect in Circulation Control Airfoil[J].

Previously, it was carried out a computational fluid dynamics (CFD) calculation [10] to obtain the temperature produced by the gas flow on the blade surface.
The CFD domain was considered between the end of the first stage and the beginning of the second stage nozzle.
Lu, Finite Element Simulation on Thermal Fatigue of a Turbine Blade with Thermal Barrier Coatings, J.

The analysis method has solved the problem of multi-coupling analysis numerical simulation.
The analysis of Computational Fluid Dynamics-CFD Software principle and application, Tsinghua University Press, (2004), in press
Fluid analysis and Simulation of ANSYS CFX, Electronic Industry Press,(2012), in press

Besides, many researchers analyzed the transient characteristics of liquid slosh numerically with CFD software.
The simulation and analysis method in this paper would be used in stability control of tank vehicles in the future.
To get suitable simulation speed and relatively higher simulation accuracy, the liquid equivalent dynamic slosh model is combined of both the steady-state model and the pendulum damping model.
The vehicle configurations used in the simulation are shown in Table 1.
Simulation of liquid slosh in braking process of tank truck[J].

Simulation and Optimization to Vehicle Interior Noise in Mid and High Frequency Using VAone Xin Chen1,2,a, Chang Feng Gao1,b, Xiao Hua Geng1,c, Chen Xie1,d 1State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China 2Zhejiang Geely Automobile Institute CD.Ltd, Hangzhou.
The aerodynamic pressure on the body surfaces can be calculated by using a Fluent CFD (Computational Fluid Dynamics) model.
Fig 8 shows the measurement and simulation sound pressure level in the driver’s head cavity at 100km/h (27.8m/s).
This is related to the application characteristics of simulation theory.
The results of simulation show that the applications of PMMA can reduce the sound pressure level in mid frequency from 200 to 1000Hz effectively.

Besides, the accuracy of the simulation model has been verified by calibration.
Study on the Envi-met simulation model ENVI-met, a kind of CFD (Computational Fluid Dynamics) software is a microclimate simulation software to simulate and evaluate the outdoor thermal environment on the local scale through thermodynamics and heat transfer theory, and it has a widely application for urban environment evaluation.
In addition, the numerical simulation of ENVI-met has been calibrated and verified to evaluate the cooling effects of greening.
Methodology In the research, computer simulation was combined with on-site measurement of environmental parameters, including two steps: (1) Model calibration, namely the difference between the simulation results and on-site test values is within the range of the instruments errors, which means the simulation model could be considered as the representative of the real environment and is acceptable to evaluate and predict the thermal environment; (2) Simulation of the scenarios.
To ensure the reliability of simulation results, the LBC parameters verified before were adapted in the simulation (Table2).

Geometric Model and Simulation Conditions This paper’s geometric model is two-dimensional axisymmetric staggered tooth shape labyrinth seal.
The Labyrinth seal geometry model is shown in Fig.1, the geometry sizes and simulation conditions is shown in Table 1.
Balance the iterative calculation time and accuracy of results, all the simulations below will use 0.025mm as the element size.
Analysis of Flow Field Characteristics Simulations of internal flow and leakage characteristics had been performed by FLUENT software.
Based on the CFD labyrinth seal flow field numerical simulation[D].

During the search process, a computational fluid dynamics (CFD) based analytical model and microscopic traffic simulation VISSIM were applied to evaluate the performance of possible solutions.
Different simulation scenarios with varying AADT from 60,000 to 12,000 were tested.
Then, the microscopic traffic simulation VISSIM was implemented to validate the performance of the found solutions.
The simulation results showed very promising performance improvement, for example, 5% travel time reduction, 9% reduction in the percentage of vehicle with high collision risk and 11% emission reduction.
Compared with the other recent studies, the focus of this paper is on a real freeway stretch, other than simulation scenarios only.