A novel parallel recursive dynamics modeling method for robot with flexible bar-groups

2020 ◽  
Vol 77 ◽  
pp. 267-288 ◽  
Author(s):  
Kunming Zheng ◽  
Youmin Hu ◽  
Wenyong Yu
Keyword(s):  
Modeling Method ◽  
Dynamics Modeling ◽  
Recursive Dynamics

A Dynamics Modeling Method of Manipulator Based on Long Short Term Memory Neural Network

2021 ◽  
Author(s):  
Yameng Zhu ◽  
Hairui Zhang ◽  
Guofeng Zhou ◽  
Zhuo Liang ◽  
Rui Lyu ◽  
...  
Keyword(s):  
Neural Network ◽  
Short Term Memory ◽  
Modeling Method ◽  
Dynamics Modeling ◽  
Short Term ◽  
Term Memory ◽  
Long Short Term Memory

ENHANCING THE SYSTEM DYNAMICS MODELING PROCESS WITH A DOMAIN MODELING METHOD

2013 ◽  
Vol 22 (02) ◽  
pp. 1350011 ◽  
Author(s):  
FIONA P. TULINAYO ◽  
PATRICK VAN BOMMEL ◽  
H. A. (ERIK) PROPER
Keyword(s):  
System Dynamics ◽  
Real Life ◽  
Modeling Method ◽  
Flow Diagram ◽  
Domain Modeling ◽  
Dynamics Modeling ◽  
Organizational Settings ◽  
National Medical ◽  
Modeling Process ◽  
Object Role Modeling

Defining complex system dynamics (SD) models in complex organizational settings is hard. This is so because the numbers of variables to consider are many and the question of causation is complicated to untangle. Second, SD models are ambiguous and hard to conceptualize. In this paper, we explore the use of a domain modeling method object-role modeling (ORM) in the process of developing SD models. We do so, because domain modeling methods help to identify relationships among entities within the scope of the problem domain and provide a structural view of the domain. The addition of a domain modeling method to the process of developing SD models is to improve SD model conceptualization, enable transformation and reuse of information plus underpin SD with a domain modeling method that allows creation of database. To realize this, we come up with a procedure in our overall research which we refer to as grounded system dynamics (GSD) a combination of ORM and SD. To reason about the combination of SD with a domain modeling method (ORM), we identify and evaluate relationships between their constructs. Basing on the identified relations, ORM to stock and flow diagram (SFD) steps are defined and applied to a real-life case study national medical stores (NMS) situated in Uganda. On completion, we draw conclusions.

1036 Multi-replica Molecular Dynamics Modeling Method and Its Applications

2009 ◽  
Vol 2009.22 (0) ◽  
pp. 304-305
Author(s):  
Akio ISHII ◽  
Hiroki USHIDA ◽  
Hajime KIMIZUKA ◽  
Shigenobu OGATA
Keyword(s):  
Molecular Dynamics ◽  
Modeling Method ◽  
Dynamics Modeling ◽  
Molecular Dynamics Modeling

scholarly journals Methods of determination of the gas-dynamic characteristics of a jet nozzle of an aerodynamic object

2021 ◽  
Vol 66 (3) ◽  
pp. 320-328
Author(s):  
A. Ph. Ilyushchanka ◽  
A. K. Kryvanos ◽  
A. D. Chorny ◽  
Y. Ya. Piatsiushyk
Keyword(s):  
Gas Dynamics ◽  
Modeling Method ◽  
Jet Engines ◽  
Dynamics Modeling ◽  
Dimensional Theory ◽  
One Dimensional ◽  
Modeling Methods ◽  
Gas Dynamic ◽  
Working Medium ◽  
Jet Nozzle

The efficiency of aerodynamic objects with jet engines is the result of many factors, among which nozzle parameters are of great importance in relation to the general engine design and the energy source, that determines the composition and properties of the engine working medium. In this respect, an urgent need was to calculate nozzle gas-dynamic characteristics and geometric parameters at various designing and testing stages of jet engines. Relatively simple calculations involving a large number of assumptions and detailed modeling with regard to the maximum possible number of factors are the basis of the existing modeling approaches. In the present work, the problem was to assess an agreement between such modeling methods of a specific ‘high-energy material – working medium – nozzle’ system and the experimental ones. The calculations using one-dimensional nozzle theory and the gas dynamics modeling method revealed a 6 % difference in the results of various parameters. At the same time, a closer agreement was noted between the experimental data and the results predicted by the gas dynamics modeling method. Moreover, in comparison to one-dimensional theory, the gas dynamics modeling method of an engine jet nozzle is more labor-intensive and expensive for calculations. Therefore, from the practical viewpoint, it is advisable to give preference to one-dimensional theory to calculate the engine construction and to verify calculations with the use of the modeling methods.

Research on the civil aero-engine modeling method oriented to control law design

2021 ◽  
Author(s):  
Shuai Liu ◽  
Ming Zhang ◽  
Wei Wang ◽  
Jie Bai ◽  
ShiJie Dai
Keyword(s):  
Standard Model ◽  
Control Method ◽  
Complex Structure ◽  
Modeling Method ◽  
Civil Aviation ◽  
Control Law ◽  
Engine Control ◽  
Dynamics Modeling ◽  
Engine Modeling ◽  
Aero Engine

Abstract The non-linear aero-thermal model of civil aero-engine established by the component method has the characteristics of complex structure and strong coupling of parameters, which is difficult to directly use in the design of control law. Aiming at the problem that civil aero-engine control law design is difficult, heavy workload, and can only be used for nominal point linearization model, a civil aero-engine modeling method oriented to control law design is proposed. Simplify the structure according to the aero-engine control function, and use rotor dynamics modeling and combustion reaction dynamics modeling to establish aero-engine control standard model in differential form, which establishes the corresponding relationship of the parameters required for the control of the aero-engine full envelope. With this control standard model, the nonlinear control method can be directly used in the design of the aero-engine control law, which reduces the workload and difficulty of the control law design to certain extent. The control standard model is established by taking DGEN380 aero-engine as an example, whose accuracy is verified through experiments, and an example of the control law design is given. The civil aviation engine modeling method oriented to control law design has achieved the expected goal.

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