scholarly journals Dynamic modeling of a small open Joule cycle reciprocating Ericsson engine: simulation results

2013 ◽  
Vol 1 (3) ◽  
pp. 109-117 ◽  
Author(s):  
F. Lontsi ◽  
O. Hamandjoda ◽  
K. F. Djanna ◽  
P. Stouffs ◽  
J. Nganhou
Keyword(s):  
Dynamic Modeling ◽  
Engine Simulation ◽  
Simulation Results

Dynamic Modeling of a High-Dynamic Flight Simulator

2014 ◽  
Vol 687-691 ◽  
pp. 610-615 ◽  
Author(s):  
Hui Liu ◽  
Li Wen Guan
Keyword(s):  
Dynamic Modeling ◽  
Degrees Of Freedom ◽  
Flight Simulator ◽  
Inverse Dynamic ◽  
Dynamic Formulation ◽  
Time Histories ◽  
Rotational Degrees Of Freedom ◽  
High Dynamic ◽  
Euler Approach ◽  
Simulation Results

High-dynamic flight simulator (HDFS), using a centrifuge as its motion base, is a machine utilized for simulating the acceleration environment associated with modern advanced tactical aircrafts. This paper models the HDFS as a robotic system with three rotational degrees of freedom. The forward and inverse dynamic formulations are carried out by the recursive Newton-Euler approach. The driving torques acting on the joints are determined on the basis of the inverse dynamic formulation. The formulation has been implemented in two numerical simulation examples, which are used for calculating the maximum torques of actuators and simulating the time-histories of kinematic and dynamic parameters of pure trapezoid Gz-load command profiles, respectively. The simulation results can be applied to the design of the control system. The dynamic modeling approach presented in this paper can also be generalized to some similar devices.

Dynamic modeling and design of controller for the 2-DoF serial chain actuated by a cable-driven robot based on feedback linearization

2021 ◽  
pp. 095440622110279
Author(s):  
Vahid Bahrami ◽  
Ahmad Kalhor ◽  
Mehdi Tale Masouleh
Keyword(s):  
Dynamic Modeling ◽  
Pid Controller ◽  
Feedback Linearization ◽  
Tracking Error ◽  
Pid Controllers ◽  
Serial Chain ◽  
Simulation Results ◽  
The Stability ◽  
Feedback Linearization Approach ◽  
Bounded Disturbance

This study intends to investigate a dynamic modeling and design of controller for a planar serial chain, performing 2-DoF, in interaction with a cable-driven robot. The under study system can be used as a rehabilitation setup which is helpful for those with arm disability. The latter goal can be achieved by applying the positive tensions of the cable-driven robot which are designed based on feedback linearization approach. To this end, the system dynamics formulation is developed using Lagrange approach and then the so-called Wrench-Closure Workspace (WCW) analysis is performed. Moreover, in the feedback linearization approach, the PD and PID controllers are used as auxiliary controllers input and the stability of the system is guaranteed as a whole. From the simulation results it follows that, in the presence of bounded disturbance based on Roots Mean Square Error (RMSE) criteria, the PID controller has better performance and tracking error of the 2-DoF robot joints are improved 15.29% and 24.32%, respectively.

Comparisons of Diesel PCCI Combustion Simulations Using a Representative Interactive Flamelet Model and Direct Integration of CFD With Detailed Chemistry

2006 ◽  
Vol 129 (1) ◽  
pp. 252-260 ◽  
Author(s):  
Song-Charng Kong ◽  
Hoojoong Kim ◽  
Rolf D. Reitz ◽  
Yongmo Kim
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Direct Integration ◽  
Computational Cell ◽  
Flamelet Model ◽  
Detailed Chemistry ◽  
Engine Simulation ◽  
Integration Approach ◽  
Simulation Results ◽  
Release Data

Diesel engine simulation results using two different combustion models are presented in this study, namely the representative interactive flamelet (RIF) model and the direct integration of computational fluid dynamics and CHEMKIN. Both models have been implemented into an improved version of the KIVA code. The KIVA/RIF model uses a single flamelet approach and also considers the effects of vaporization on turbulence-chemistry interactions. The KIVA/CHEMKIN model uses a direct integration approach that solves for the chemical reactions in each computational cell. The above two models are applied to simulate combustion and emissions in diesel engines with comparable results. Detailed comparisons of predicted heat release data and in-cylinder flows also indicate that both models predict very similar combustion characteristics. This is likely due to the fact that after ignition, combustion rates are mixing controlled rather than chemistry controlled under the diesel conditions studied.

Optimization Method and Simulation Study of a Diesel Engine Using Full Variable Valve Motions

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Yong Lu ◽  
Daniel B. Olsen
Keyword(s):  
Diesel Engine ◽  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Optimization Method ◽  
Simulation Software ◽  
Volumetric Efficiency ◽  
Engine Simulation ◽  
Valve Motion ◽  
Simulation Results ◽  
Variable Valve

Variable valve timing technologies for internal combustion engines are used to improve power, torque, and increase fuel efficiency. Details of a new solution are presented in this paper for optimizing valve motions of a full variable valve actuation (FVVA) system. The optimization is conducted at different speeds by varying full variable valve motion (variable exhaust open angle, intake close angle, velocity of opening and closing, overlap, dwell duration, and lift) parameters simultaneously; the final optimized valve motions of CY4102 diesel engine are given. The CY4102 diesel engine with standard cam drives is used in large quantities in Asia. An optimized electrohydraulic actuation motion used for the FVVA system is presented. The electrohydraulic actuation and optimized valve motions were applied to the CY4102 diesel engine and modeled using gt-power engine simulation software. Advantages in terms of volumetric efficiency, maximum power, brake efficiency, and fuel consumption are compared with baseline results. Simulation results show that brake power is improved between 12.8% and 19.5% and torque is improved by 10%. Brake thermal efficiency and volumetric efficiency also show improvement. Modeling and simulation results show significant advantages of the full variable valve motion over standard cam drives.

Dynamic Modeling of Nonlinear Systems Using Wavelet Networks

2008 ◽  
Vol 20 (1) ◽  
pp. 178-187 ◽  
Author(s):  
Wissam Hassouneh ◽  
◽  
Rached Dhaouadi ◽  
Yousef Al-Assaf
Keyword(s):  
Nonlinear Systems ◽  
Dynamic Modeling ◽  
Function Approximation ◽  
System Modeling ◽  
Wavelet Network ◽  
Wavelet Networks ◽  
Simulation Results

The purpose of this paper is to present wavelet networks as a new scheme to model nonlinear systems. The capabilities of wavelet networks in function approximation make them appealing for system modeling. The wavelet networks presented are utilized in the dynamic modeling of a nonlinear servomechanism. A new wavelet network scheme is proposed for the identification of the nonlinearity in the servomechanism. Simulation results show the modeling performance of both schemes.

Dynamic Modeling and Analysis of a Fruit and Vegetable Picking Robot

2012 ◽  
Vol 241-244 ◽  
pp. 1845-1849
Author(s):  
Yan Wang ◽  
Yun Wang Ge ◽  
Xiao Li Wang
Keyword(s):  
Dynamic Modeling ◽  
Trajectory Planning ◽  
Dynamic Models ◽  
Lagrange Equation ◽  
Angular Displacement ◽  
Fruit And Vegetable ◽  
Robot System ◽  
Modeling And Analysis ◽  
Abrupt Changes ◽  
Simulation Results

According to characteristics of the fruit and vegetable picking operations, an articulated picking robot with four degree-of-freedom is developed. And in order to perform an expected motion of picking work, the kinematic and dynamic models have to be constructed firstly. Kinematics is established based on Denavit-Hartenberg notation. Then, the explicit expressions of dynamic models are presented through Lagrange equation. Finally, trajectory planning from one point to another point is carried out with cycloidal motion, and the angular displacement, velocity, acceleration and torque curves of each joint are analyzed. Simulation results show that the torque curves are quite smooth and with no abrupt changes, which indicates that the motions of each joint won’t result vibrations and can ensure stability of the robot system.

Small Fluctuations Research of Internet AS-Level Topology Based on PFP Model

2013 ◽  
Vol 712-715 ◽  
pp. 2635-2638
Author(s):  
Bo Yang ◽  
Hai Zhao ◽  
Jun Zhang ◽  
Si Yuan Jia ◽  
Yi Wen Liu ◽  
...  
Keyword(s):  
Periodic Function ◽  
Dynamic Modeling ◽  
Power Law ◽  
Data Fitting ◽  
Actual Data ◽  
The Internet ◽  
Set Point ◽  
Small Fluctuation ◽  
Simulation Results ◽  
Modeling Algorithm

In order to highlight small fluctuation characteristics of the mutation evolution, this paper by adding periodic function, and use the actual data fitting Internet with Ark to obtain the new attachment to improve PFP model priority set point formula. Simulation results show that the model not only keeps power law, but also better reflects small fluctuation characteristics of the Internet AS-level topology. The dynamic modeling algorithm can reconfigure the evolution of the Internet.

Dynamic Modeling and Simulation of Stratospheric Airships

2012 ◽  
Vol 457-458 ◽  
pp. 237-244
Author(s):  
Guo Chang Hu ◽  
Mei Ping Wu
Keyword(s):  
Modeling And Simulation ◽  
Dynamic Model ◽  
Dynamic Modeling ◽  
Theoretical Basis ◽  
Simulation Method ◽  
Autonomous Control ◽  
Overall Design ◽  
Stratospheric Airship ◽  
Simulation Results ◽  
Motion Characteristics

Aiming at the requirements of autonomous control for stratospheric airships, based on description of the modeling plant and forces analysis in detail, the dynamic model is established by Newton Method. The motion characteristics of airships under control action are analyzed using simulation method. Simulation results indicate the correctness of dynamic model, and can make itself a theoretical basis for the overall design of the stratospheric airship.

Comparisons of Combustion Simulations Using a Representative Interactive Flamelet Model and Direct Integration of CFD With Detailed Chemistry

2005 ◽  
Author(s):  
Song-Charng Kong ◽  
Hoojoong Kim ◽  
Rolf D. Reitz ◽  
Yongmo Kim
Keyword(s):  
Diesel Engine ◽  
Chemical Reactions ◽  
Direct Integration ◽  
Computational Cell ◽  
Flamelet Model ◽  
Detailed Chemistry ◽  
Engine Simulation ◽  
Integration Approach ◽  
Simulation Results ◽  
Release Data

Diesel engine simulation results using two different combustion models are presented in this study, namely the Representative Interactive Flamelet (RIF) model and the direct integration of CFD and CHEMKIN. Both models have been implemented into an improved version of the KIVA code. The KIVA/RIF model uses a single flamelet approach and also considers the effects of vaporization on turbulence-chemistry interactions. The KIVA/CHEMKIN model uses a direct integration approach that solves for the chemical reactions in each computational cell. The above two models are applied to simulate combustion and emissions in diesel engines with comparable results. Detailed comparisons of predicted heat release data and in-cylinder flows also indicate that both models predict very similar combustion characteristics. This is likely due to the fact that after ignition, combustion rates are mixing controlled rather than chemistry controlled under the diesel conditions studied.

scholarly journals Dynamic Modeling and Experimental Verification of Bus Pneumatic Brake System

2015 ◽  
Vol 9 (1) ◽  
pp. 52-57
Author(s):  
Lu Yi ◽  
Xu Bowen ◽  
Guo Bin
Keyword(s):  
Computer Simulation ◽  
Dynamic Characteristic ◽  
Dynamic Modeling ◽  
Experimental Verification ◽  
Brake System ◽  
Test Bed ◽  
Mathematical Relationship ◽  
Simulation Results ◽  
Mathematical Derivation ◽  
Fitness Analysis

The dynamic characteristic of pneumatic brake system is very important, so the full-parameter model of the pneumatic brake system was established on the base of the technology of computer simulation. Its key brake components include brake valve, relay valve, diaphragm brake chamber and pneumatic circuit. AMESim was first introduced on the basis of mathematical derivation. So the multivariable complexity derivation, nonlinear mathematical relationship can be avoided. The model can be used for the bus brake system multi-parameter simulation and design. A pneumatic brake system test-bed was designed to verify the accuracy of the model. It can measure the dynamic characteristic and the output response coordination of each component. It was showed that the simulation results were fit to the experiment results. For the deviation, the explanation and analysis were also given. The response hysteresis of the brake system is mainly caused by the rubber diaphragm deformation in brake chamber. This research laid the foundation for the further structural optimization of brake components and fitness analysis of the pneumatic brake system.

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