scholarly journals System description of the defect creation and elimination in the buildings

2018 ◽  
Vol 146 ◽  
pp. 01011 ◽  
Author(s):  
Dalibor Vytlačil
Keyword(s):  
System Dynamics ◽  
Dynamic Model ◽  
Facility Management ◽  
System Description ◽  
System Parameters ◽  
Running Cost ◽  
Defect Elimination ◽  
Dynamics Method ◽  
Parameters Calculation ◽  
Flow Element

The paper deals with the dynamics of the system of defects creation in the buildings and also with the possibilities of the defects elimination. The problem is described by the dynamic model that includes key elements influencing the system behaviour. The model is based on the system dynamics method that uses the stock elements and the flow elements which change the stock element values. In the described problem the main stock is the number of the equipment defects. This parameter can be increased by the flow element that depends on the time of using and the load. For the defect elimination are two possibilities: the planned maintenance and the repair of broken parts. Other elements are number of workers available for the elimination of defects and the running cost depending on the maintenance effort. The case of the main system parameters calculation is presented. The model can be used for understanding the importance of the maintenance in the field of facility management.

Research on the Demand Forcast of Beijing Car Rental Industry Based on System Dynamics

2012 ◽  
Vol 235 ◽  
pp. 267-270 ◽  
Author(s):  
Feng Jiao Wan
Keyword(s):  
System Dynamics ◽  
Causal Relationship ◽  
Dynamic Model ◽  
Full Account ◽  
Final Model ◽  
Car Rental ◽  
Main Factors ◽  
Car Rental Industry ◽  
Dynamics Method

In order to take full account of the various factors in the car rental system, in this paper, the system dynamics method is applied to the car rental industry demand forecast.First, we analyze the main factors of the car rental system and its causal relationship, and then establish the dynamic model of the car rental system .The final model was validated using the Beijing car rental industry statistics .

scholarly journals Development, Modeling and Control of a Dual Tilt-Wing UAV in Vertical Flight

Drones ◽  
2020 ◽  
Vol 4 (4) ◽  
pp. 71
Author(s):  
Luz M. Sanchez-Rivera ◽  
Rogelio Lozano ◽  
Alfredo Arias-Montano
Keyword(s):  
Dynamic Model ◽  
Attitude Control ◽  
Test Bench ◽  
Aerodynamic Coefficients ◽  
Nonlinear Dynamic Model ◽  
Modeling And Control ◽  
Drag And Lift ◽  
And Control ◽  
Dynamics Method ◽  
Indoor And Outdoor

Hybrid Unmanned Aerial Vehicles (H-UAVs) are currently a very interesting field of research in the modern scientific community due to their ability to perform Vertical Take-Off and Landing (VTOL) and Conventional Take-Off and Landing (CTOL). This paper focuses on the Dual Tilt-wing UAV, a vehicle capable of performing both flight modes (VTOL and CTOL). The UAV complete dynamic model is obtained using the Newton–Euler formulation, which includes aerodynamic effects, as the drag and lift forces of the wings, which are a function of airstream generated by the rotors, the cruise speed, tilt-wing angle and angle of attack. The airstream velocity generated by the rotors is studied in a test bench. The projected area on the UAV wing that is affected by the airstream generated by the rotors is specified and 3D aerodynamic analysis is performed for this region. In addition, aerodynamic coefficients of the UAV in VTOL mode are calculated by using Computational Fluid Dynamics method (CFD) and are embedded into the nonlinear dynamic model. To validate the complete dynamic model, PD controllers are adopted for altitude and attitude control of the vehicle in VTOL mode, the controllers are simulated and implemented in the vehicle for indoor and outdoor flight experiments.

Discrete-event modeling by system dynamics method

2021 ◽  
Author(s):  
A. N. Medvedev ◽  
V. N. Timokhin ◽  
Yu. A. Nelyubina
Keyword(s):  
System Dynamics ◽  
Discrete Event ◽  
Event Modeling ◽  
Dynamics Method

scholarly journals A Study on The Assessment of Flood Damages by System Dynamics Method

1976 ◽  
Vol 7 ◽  
pp. 77-94
Author(s):  
Seiichi KAGAYA ◽  
Estuo YAMAMURA
Keyword(s):  
System Dynamics ◽  
Flood Damages ◽  
Dynamics Method

Dynamic model orbits and Earth system parameters from combined GPS and LEO data

2005 ◽  
Vol 36 (3) ◽  
pp. 431-437 ◽  
Author(s):  
R. König ◽  
Ch. Reigber ◽  
S.Y. Zhu
Keyword(s):  
Dynamic Model ◽  
Earth System ◽  
System Parameters

Overview of Unconventional Risk Quantification Methods

2020 ◽  
pp. 79-100
Author(s):  
Yuri G. Raydugin
Keyword(s):  
System Dynamics ◽  
Biased Sampling ◽  
Parametric Methods ◽  
Risk Quantification ◽  
Project Risks ◽  
Dynamics Modelling ◽  
Linear Interactions ◽  
Unconventional Methods ◽  
Dynamics Method

Unconventional risk quantification methods focused on risk assessments only are reviewed. It is shown that all unconventional methods are actually not risk quantification methods being aimed at evaluation of overall project durations and costs. Three methods are reviewed—parametric, artificial neural networks (ANN), and system dynamics. Reasons for high systematic errors and low accuracy of parametric methods are uncovered. They stem from using biased sampling—convenience and judgement samples—as well as from mathematical shortcomings of parametric methods. ANN methodology is positioned as a possible fundamental upgrade for parametric methods. It is shown that the ANN method also depends on quality of used samples. The system dynamics method is introduced to reveal non-linear interactions in project systems based on implications of project rework cycles. It is pointed out that if identified and addressed project risks are factored into the system dynamics modelling the latter could be requalified as a conventional methodology.

scholarly journals The use of tools and approaches of system dynamics in the analysis of the efficiency of BIM implementation and its impact on the management and planning of investments in the construction sector

2019 ◽  
Vol 279 ◽  
pp. 01011
Author(s):  
Martin Hotový
Keyword(s):  
Decision Making ◽  
System Dynamics ◽  
Dynamic Model ◽  
Investment Decision ◽  
Construction Sector ◽  
Strategic Investment ◽  
Investment Projects ◽  
Investment Decision Making ◽  
Proposed Model ◽  
The Impact

This paper presents the use of tools and approaches of system dynamics in the analysis of the efficiency of BIM tools implementation in relation to the management and planning of investments in the construction sector. The dynamic model based on the approach of system dynamics allows to simulate the impact rate (range) of BIM implementation in strategic investment decision-making in the construction sector. Based on the analysis, the key parameters critically affecting the large construction investment projects are determined. The proposed model is implemented as a submodel in the dynamic model designed for potential refinements in the strategic planning of the extent of investments into projects of civil infrastructure of the Czech Republic. The model allows to test different strategies in the virtual world before their implementation. The prediction of future developments based on the proposed model allows to streamline planning and decision-making processes.

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