REDUCED MODELS FOR CALCULATION OF RADIATION-TUBE BURNERS - THE DEFLECTING ZONE

2017 ◽  
Author(s):  
Aline Jünger ◽  
Ingo Riehl ◽  
Tobias Fieback ◽  
Ulrich Gross
Keyword(s):  
Reduced Models

Hybrid Reduced Model of Rotor

2013 ◽  
Vol 60 (3) ◽  
pp. 319-333
Author(s):  
Rafał Hein ◽  
Cezary Orlikowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hybrid Model ◽  
Rotor System ◽  
Reduced Model ◽  
Order Model ◽  
Gyroscopic Effect ◽  
Reduced Models ◽  
Rigid Finite Element Method ◽  
Low Order

Abstract In the paper, the authors describe the method of reduction of a model of rotor system. The proposed approach makes it possible to obtain a low order model including e.g. non-proportional damping or the gyroscopic effect. This method is illustrated using an example of a rotor system. First, a model of the system is built without gyroscopic and damping effects by using the rigid finite element method. Next, this model is reduced. Finally, two identical, low order, reduced models in two perpendicular planes are coupled together by means of gyroscopic and damping interaction to form one model of the system. Thus a hybrid model is obtained. The advantage of the presented method is that the number of gyroscopic and damping interactions does not affect the model range

scholarly journals Global and local reduced models for interacting, heterogeneous agents

2021 ◽  
Vol 31 (7) ◽  
pp. 073139
Author(s):  
Thomas N. Thiem ◽  
Felix P. Kemeth ◽  
Tom Bertalan ◽  
Carlo R. Laing ◽  
Ioannis G. Kevrekidis
Keyword(s):  
Heterogeneous Agents ◽  
Reduced Models ◽  
Global And Local

Energy-Based Model Reduction Methodology for Automated Modeling

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Loucas S. Louca ◽  
Jeffrey L. Stein ◽  
Gregory M. Hulbert
Keyword(s):  
Model Reduction ◽  
Order Reduction ◽  
Process Models ◽  
Model Parameters ◽  
Automated Modeling ◽  
Reduced Models ◽  
System Models ◽  
Quarter Car Model ◽  
Reduction Techniques ◽  
Physical Phenomena

In recent years, algorithms have been developed to help automate the production of dynamic system models. Part of this effort has been the development of algorithms that use modeling metrics for generating minimum complexity models with realization preserving structure and parameters. Existing algorithms, add or remove ideal compliant elements from a model, and consequently do not equally emphasize the contribution of the other fundamental physical phenomena, i.e., ideal inertial or resistive elements, to the overall system behavior. Furthermore, these algorithms have only been developed for linear or linearized models, leaving the automated production of models of nonlinear systems unresolved. Other model reduction techniques suffer from similar limitations due to linearity or the requirement that the reduced models be realization preserving. This paper presents a new modeling metric, activity, which is based on energy. This metric is used to order the importance of all energy elements in a system model. The ranking of the energy elements provides the relative importance of the model parameters and this information is used as a basis to reduce the size of the model and as a type of parameter sensitivity information for system design. The metric is implemented in an automated modeling algorithm called model order reduction algorithm (MORA) that can automatically generate a hierarchical series of reduced models that are realization preserving based on choosing the energy threshold below which energy elements are not included in the model. Finally, MORA is applied to a nonlinear quarter car model to illustrate that energy elements with low activity can be eliminated from the model resulting in a reduced order model, with physically meaningful parameters, which also accurately predicts the behavior of the full model. The activity metric appears to be a valuable metric for automating the reduction of nonlinear system models—providing in the process models that provide better insight and may be more numerically efficient.

Concept design of vehicle bodies using reduced models of beams, joints and panels

2011 ◽  
Vol 57 (1) ◽  
pp. 71 ◽  
Author(s):  
D. Mundo ◽  
S. Donders ◽  
G. Stigliano ◽  
H. Van Der Auweraer
Keyword(s):  
Concept Design ◽  
Reduced Models ◽  
Vehicle Bodies

scholarly journals Evaluating the productivity of four main tree species in Germany under climate change with static reduced models

2015 ◽  
Vol 73 (2) ◽  
pp. 401-410 ◽  
Author(s):  
Martin Gutsch ◽  
Petra Lasch-Born ◽  
Felicitas Suckow ◽  
Christopher P.O. Reyer
Keyword(s):  
Climate Change ◽  
Tree Species ◽  
Reduced Models
Sign in / Sign up

Export Citation Format

Share Document