Real Time Linear Simulation and Control for the Small Aircraft Turbojet Engine

1997 ◽  
Author(s):  
C. D. Kong ◽  
S. K. Kim
Keyword(s):  
Real Time ◽  
Linear Model ◽  
Dynamic Simulation ◽  
Engine Performance ◽  
The Real ◽  
Turbojet Engine ◽  
Step Model ◽  
Lqr Controller ◽  
Time Linear ◽  
Small Aircraft

The performance of the aero gas turbine engine requires optimization because it is directly related to overall aircraft performance. In this study, a modified DYNGEN, a dynamic simulation program with component maps of the small aircraft turbojet engine, was used. Nonlinear dynamic simulation was performed to predict overall engine performance. Each response characteristic of various cases, such as the 6% rpm step model, the 5% rpm step model, the 3% rpm step model, and the real-time linear model of the interpolation scheme within the operating range were compared. Among them, the real time linear model was selected for the turbojet engine with nonlinear characteristics. Finally control schemes such as the PI (Proportional-Integral Controller) and the LQR (Linear Quadratic Regulator) were applied to optimize engine performance. As a result of comparison of the PI and the LQR controller, the overshoot of the turbine inlet temperature was effectively eliminated by the LQR controller with the proper control gain K.

Dynamic Simulation and Test of IEC 61850-9-2 Process Bus Applications

2012 ◽  
Vol 433-440 ◽  
pp. 2699-2705 ◽  
Author(s):  
J. Mo ◽  
B. Liu ◽  
J.C Tan
Keyword(s):  
Real Time ◽  
Dynamic Simulation ◽  
Simulation Test ◽  
Iec 61850 ◽  
Actual Performance ◽  
The Real ◽  
Test Platform ◽  
Security And Reliability

IEC 61850-9-2 proposes the process bus communication for protection and automation within substations. The actual performance of process bus such as real-time, security and reliability are of concern, when transmission of sample values and trip signals over the same network. This paper presents the establishment of a dynamic simulation test platform, in order to facilitate the test of protection schemes over the process bus. An example is given to demonstrate that incorrect switch configuration, message priority tagging, and the volumes of traffic on the network may have an impact on the real time and reliability of the signals to be delivered.

Research on the Real-Time Model of Aero-Engine Actuator

2014 ◽  
Vol 568-570 ◽  
pp. 1036-1040 ◽  
Author(s):  
Hua Cong Li ◽  
Hong An Zhang ◽  
Xiao Bao Han ◽  
Jiang Feng Fu
Keyword(s):  
Real Time ◽  
Dynamic Simulation ◽  
Computational Efficiency ◽  
Flow Coefficient ◽  
Time Model ◽  
The Real ◽  
Time Performance ◽  
Time Modeling ◽  
Aero Engine ◽  
Step Algorithm

Since the solving process of hydraulic dynamic simulation is complex and computational ineffectiveness,the aero-engine actuators real-time modeling is presented in this paper. Combined with the precise model, the convergence of the model and flow coefficient is analyzed. The real-time model operates a number of solving processes in one 20ms simulation cycle and the convergence of fix-step algorithm is guaranteed by adjusting the relevant parameters. The simulation shows that the real-time model can improve the computational efficiency with satisfactory real-time performance and precision.

Transient Control of Fully Variable Valve Actuation for Diesel Engine Using Dynamic Programming Method

2019 ◽  
Author(s):  
Yong Lu ◽  
Jian Li ◽  
Dongyan Hou ◽  
Lixian Miao
Keyword(s):  
Dynamic Programming ◽  
Diesel Engine ◽  
Real Time ◽  
Pid Controller ◽  
Engine Performance ◽  
Control Parameters ◽  
Transient Conditions ◽  
The Real ◽  
Movement Parameters ◽  
Variable Valve

Abstract Fully variable valve technology of diesel engine can change the movement parameters of valve flexibly, and then the performance of engine can be improved. But the actual valve movement can’t track the optimal valve profile due to the nonlinear characteristics of hydraulic system in transient work conditions, which make the engine performance be deteriorated. To solve the problem, the paper introduced the idea of dynamic programming (DP) into the control of FVVA system. Firstly, the paper presented a new electro-hydraulic FVVA system. To verify the FVVA system, the GT-suite models of FVVA system and engine were built. Secondly, for the purpose of achieving optimal performance, based on the NSGA-II genetic algorithm, we got the database of the optimal valve profile movement parameters using modeFRONTIER platform. In database, there are multiple feasible solutions for one work condition. To achieve the optimal engine performance in every cycle, according to the real-time valve movement profile, the controller will choose different solutions with DP method in one cycle based on the database obtained before. The DP controller can make the engine performance to be optimal according to the real-time valve profile in transient conditions. In steady conditions, optimal valve profiles can be reached by a PID controller. Thirdly, the DP controller and PID controller were designed with Simulink separately. The DP controller will adjust valve control parameters in one cycle and the PID controller will adjust the parameters cycle by cycle. At last, the DP-PID controller was compared with the single PID controller which adjust control parameters once in one cycle. The simulation results show that the performance of engine with DP-PID controller is improved compared to the PID controller especially in transient conditions. The average brake power can be improved by 3.3% to 4.7% compared to single PID controller.

scholarly journals 3-D dynamic simulation of knitwear based on the hybrid model

2021 ◽  
Vol 16 ◽  
pp. 155892502110515
Author(s):  
Sha Sha ◽  
Wantong Wei ◽  
Bowen Xiao ◽  
Di Sha ◽  
Yuqin Gao ◽  
...  
Keyword(s):  
Real Time ◽  
Dynamic Simulation ◽  
Particle System ◽  
Loop Model ◽  
Deformation Method ◽  
The Real ◽  
Rigid Deformation ◽  
Fabric Surface ◽  
Loose Layer ◽  
Floating Layer

Due to the effect of force and deformation of fancy stitches, the simulation of knitwear is facing a great challenges of the real-time. In this paper, the physical-geometric hybrid method is applied to reduce the amount of calculation during the simulation of knitwear. Discretized Newton’s Method is used to analyze the gap between dynamic knitwear-human body and the knitwear model, and then the knitwear model is further divided into different regions. A three-dimensional (3-D) mesh for knitwear is constructed by the application of adaptive remeshing. This makes it possible to refine the mesh at the parts that need the presentation of fabric surface details. Simultaneously, it can merge the adjacent patches at parts without the requirement of showing the details, and form a large 3-D patch. In the light of regional division, the 3-D knitwear model is divided into the tight layer, floating layer, and loose layer. In addition, the geometric loop model based on the cuboid particle system is employed to simulate the real force of loops and knitwear for tight layer and loose layer. Near-rigid deformation method is also applied into the floating layer to improve simulation efficiency. In conclusion, the corresponding processing method is performed with different computational models, which brings the dynamic simulation effect of knitwear with realistic and real-time.

Cloth Simulation Based on 1/F Noise Method

2014 ◽  
Vol 519-520 ◽  
pp. 923-926
Author(s):  
Zhi Hong Zhao ◽  
Bei Bei Li
Keyword(s):  
Real Time ◽  
Dynamic Simulation ◽  
3D Model ◽  
Dynamics Simulation ◽  
Wind Noise ◽  
The Real ◽  
Time Simulation ◽  
Simulation Based ◽  
Stochastic Functions ◽  
2D Model

This study addresses a method to realize cloth dynamics simulation by using a wind noise method. Taken a 1/f noise as its 2D model, the 3D model of the discussed cloth is constructed. During its 3D simulation, some stochastic functions are employed to depict its stochastic ability. For the purpose of realism and simplicity, we attend to convert our dynamic simulation frames into animation film files. From the feedback, the constructed model is improved and the real time simulation is realized by reducing the calculation.

scholarly journals Sensorless Control of PMSM Based on Backstepping-PSO-Type Controller and ESO-Type Observer Using Real-Time Hardware

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2080
Author(s):  
Claudiu-Ionel Nicola ◽  
Marcel Nicola ◽  
Dan Selișteanu
Keyword(s):  
Control System ◽  
Numerical Simulations ◽  
Real Time ◽  
Linear Model ◽  
Sensorless Control ◽  
Superior Performance ◽  
Intermediate Step ◽  
Load Torque ◽  
The Real ◽  
Wide Range

In the case of using a Permanent Magnet Synchronous Motor (PMSM) linear model of limited-range parametric variations and of relatively low dynamic of the load torque, the Field Oriented Control (FOC) type strategy ensures good performance of the PMSM control. Therefore, when using a non-linear model of wide-range parametric variations and of high dynamic of the load torque, a backstepping-type controller is proposed, whose tuning parameters are optimized by using a Particle Swarm Optimization (PSO) method. By designing an Extended State Observer (ESO), which provides a good estimate of the PMSM rotor position and speed under uncertainty conditions and with a response time shorter than that of the backstepping-type controller, this observer can be incorporated into the PMSM sensorless control system. The superior performance of the proposed sensorless control system based on the backstepping-PSO-type controller and an ESO-type observer is demonstrated through numerical simulations. Given that the real-time implementation of the control algorithms and observers in an embedded system is a difficult task, consisting of several steps, it is presented after the numerical simulations, which can be assimilated into the Software-in-the-Loop (SIL) step, the Processor-in-the-Loop (PIL) intermediate step, and the Hardware-in-the-Loop (HIL) final step. A comparison between the backstepping-PSO-type controller and the PI-PSO-type controller is presented by means of the real-time implementation of these controllers and demonstrates the superiority of the backstepping-PSO-type controller.

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