Dynamic Modelling of a Cubic Flying Robot

2010 ◽  
Author(s):  
David St-Onge ◽  
Cle´ment Gosselin ◽  
Nicolas Reeves
Keyword(s):  
Experimental Data ◽  
Dynamic Model ◽  
Dynamic Modelling ◽  
Inertial Effects ◽  
Proper Selection ◽  
Art Galleries ◽  
Proposed Model ◽  
Potential Applications ◽  
Flying Robot ◽  
Flying Robots

This paper presents preliminary results on the dynamic modelling of a cubic flying robot referred to as the Tryphon. Several Tryphons and other similar cubic flying robots have been built in the course of this project. They are used for artistic performances in museums, art galleries or theatres. Although the Tryphons are functional, they are difficult to control because of limited knowledge of their behaviour. Hence, the development of a dynamic model has the potential to significantly improve the control performances. Based on models found in the literature, the aerostatics, aerodynamics, gravity, buoyancy and inertial effects of the Tryphon are combined into a dynamic model in this paper. The parameters of the proposed model are adjusted based on experimental data obtained with the Tryphons. It is shown that a proper selection and optimization of the parameters can accurately predict the dynamics of the robot. Further extensions of the model are discussed and potential applications are proposed.

Dual Release Model to Evaluate Dissolution Profiles from Swellable Drug Polyelectrolyte Matrices

2020 ◽  
Vol 17 (6) ◽  
pp. 511-522 ◽  
Author(s):  
Alicia Graciela Cid ◽  
María Verónica Ramírez-Rigo ◽  
María Celeste Palena ◽  
Elio Emilio Gonzo ◽  
Alvaro Federico Jimenez-Kairuz ◽  
...  
Keyword(s):  
Experimental Data ◽  
Drug Release ◽  
Inflection Point ◽  
Release Profile ◽  
Experimental Point ◽  
Extended Model ◽  
Release Process ◽  
Proposed Model ◽  
Dual Release ◽  
Release Model

Background: Mathematical modeling in modified drug release is an important tool that allows predicting the release rate of drugs in their surrounding environment and elucidates the transport mechanisms involved in the process. Objective: The aim of this work was to develop a mathematical model that allows evaluating the release profile of drugs from polymeric carriers in which the swelling phenomenon is present. Methods: Swellable matrices based on ionic complexes of alginic acid or carboxymethylcellulose with ciprofloxacin were prepared and the effect of adding the polymer sodium salt on the swelling process and the drug release was evaluated. Experimental data from the ciprofloxacin release profiles were mathematically adjusted, considering the mechanisms involved in each stage of the release process. Results: A proposed model, named “Dual Release” model, was able to properly fit the experimental data of matrices presenting the swelling phenomenon, characterized by an inflection point in their release profile. This entails applying the extended model of Korsmeyer-Peppas to estimate the percentage of drug released from the first experimental point up to the inflection point and then a model called Lumped until the final time, allowing to adequately represent the complete range of the drug release profile. Different parameters of pharmaceutical relevance were calculated using the proposed model to compare the profiles of the studied matrices. Conclusion: The “Dual Release” model proposed in this article can be used to predict the behavior of complex systems in which different mechanisms are involved in the release process.

Wear of a Tool in Double-Disk Lapping of Silicon Wafers

2010 ◽  
Author(s):  
Adam Barylski ◽  
Mariusz Deja
Keyword(s):  
Experimental Data ◽  
Integrated Circuits ◽  
Tool Wear ◽  
Silicon Wafers ◽  
Silicon Ingot ◽  
Proposed Model ◽  
Tool Wear Prediction ◽  
Simulation Results ◽  
High Degree ◽  
Kinematical Parameters

Silicon wafers are the most widely used substrates for fabricating integrated circuits. A sequence of processes is needed to turn a silicon ingot into silicon wafers. One of the processes is flattening by lapping or by grinding to achieve a high degree of flatness and parallelism of the wafer [1, 2, 3]. Lapping can effectively remove or reduce the waviness induced by preceding operations [2, 4]. The main aim of this paper is to compare the simulation results with lapping experimental data obtained from the Polish producer of silicon wafers, the company Cemat Silicon from Warsaw (www.cematsil.com). Proposed model is going to be implemented by this company for the tool wear prediction. Proposed model can be applied for lapping or grinding with single or double-disc lapping kinematics [5, 6, 7]. Geometrical and kinematical relations with the simulations are presented in the work. Generated results for given workpiece diameter and for different kinematical parameters are studied using models programmed in the Matlab environment.

Effect of Interaction Modeling in AFM-Based Nanomanipulation

2008 ◽  
Author(s):  
Fakhreddine Landolsi ◽  
Fathi H. Ghorbel ◽  
James B. Dabney
Keyword(s):  
Experimental Data ◽  
Numerical Simulations ◽  
Interaction Model ◽  
Collision Process ◽  
Visual Sensing ◽  
Proposed Model ◽  
Interaction Modeling

AFM-based nanomanipulation is very challenging because of the complex mechanics in tip-sample interactions and the limitations in AFM visual sensing capabilities. In the present paper, we investigate the modeling of AFM-based nanomanipulation emphasizing the effects of the relevant interactions at the nanoscale. The major contribution of the present work is the use of a combined DMT-JKR interaction model in order to describe the complete collision process between the AFM tip and the sample. The coupling between the interactions and the friction at the nanoscale is emphasized. The efficacy of the proposed model to reproduce experimental data is demonstrated via numerical simulations.

scholarly journals CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition

2017 ◽  
Vol 2017 ◽  
pp. 1-15
Author(s):  
Salah Al-Enezi
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Glass Transition ◽  
Dissolved Gas ◽  
Foaming Process ◽  
Foaming Behavior ◽  
Potential Applications ◽  
Model C ◽  
Parameter Values ◽  
Good Agreement

This paper examines the effect of high-pressure carbon dioxide on the foaming process in polystyrene near the glass transition temperature and the foaming was studied using cylindrical high-pressure view cell with two optical windows. This technique has potential applications in the shape foaming of polymers at lower temperatures, dye impregnation, and the foaming of polystyrene. Three sets of experiments were carried out at operating temperatures of 50, 70, and 100°C, each over a range of pressures from 24 to 120 bar. Foaming was not observed when the polymer was initially at conditions below Tg but was observed above Tg. The nucleation appeared to occur randomly leading to subsequent bubble growth from these sites, with maximum radius of 0.02–0.83 mm. Three models were applied on the foaming experimental data. Variable diffusivity and viscosity model (Model C) was applied to assess the experimental data with the WLF equation. The model shows very good agreement by using realistic parameter values. The expansion occurs by diffusion of a dissolved gas from the supersaturated polymer envelope into the bubble.

Dynamic Model of Dual Clutch Lever-Based Electromechanical Actuator

2011 ◽  
Author(s):  
Vladimir Ivanovic´ ◽  
Josˇko Deur ◽  
Milan Milutinovic´ ◽  
H. Eric Tseng
Keyword(s):  
Experimental Data ◽  
Dynamic Model ◽  
Model Validation ◽  
Bond Graph ◽  
Test Rig ◽  
Electromechanical Actuator ◽  
Actuator Dynamics ◽  
Operating Modes ◽  
Graph Modeling ◽  
Bond Graph Modeling

The paper presents a dynamic model of a dual clutch lever-based electromechanical actuator. Bond graph modeling technique is used to describe the clutch actuator dynamics. The model is parameterized and thoroughly validated based on the experimental data collected by using a test rig. The model validation results are used for the purpose of analysis of the actuator behavior under typical operating modes.

scholarly journals Analytical Model for Restraint Strains and Self-stressed in Expansive Concrete Filled Steel Tubes (ECFST) estimation

2020 ◽  
pp. 93-98
Author(s):  
Viktar V. Tur ◽  
Radoslaw Duda ◽  
Dina Khmaruk ◽  
Viktar Basav
Keyword(s):  
Experimental Data ◽  
Experimental Studies ◽  
Steel Tube ◽  
Development Model ◽  
Steel Tubes ◽  
Concrete Core ◽  
Expansive Concrete ◽  
Proposed Model ◽  
Comparison Results ◽  
Concrete Filled Steel Tubes

In this paper, a modified strains development model (MSDM) for expansive concrete-filled steel tube (ECFST) was formulated and verified on the experimental data, obtained from testing specimens on the expansion stage. The modified strain development model for restraint strains and self-stresses values estimation in concrete with high expansion energy capacity under any type of the symmetrical and unsymmetrical finite stiffness restraint conditions was proposed. Based on proposed MSDM a new model for expansive concrete-filled steel tubes is developed. The main difference between this model and other previously developed models consists in taking into account in the basic equations an induced force in restrain that is considered as an external load applied to the concrete core of the member. For verification of the proposed model-specific experimental studies were performed. As follows from comparison results restrained expansion strains values calculated following the proposed model shows good compliance with experimental data. The values predicted by the proposed MSDM for concrete-filled steel and obtained experimental data demonstrated good agreement that confirms the validity of the former.

scholarly journals An Approach for Generating Weights Using the Pairwise Comparison Matrix

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Zaher Sepehrian ◽  
Sahar Khoshfetrat ◽  
Said Ebadi
Keyword(s):  
Pairwise Comparison ◽  
Decision Criterion ◽  
Data Envelopment ◽  
Decision Criteria ◽  
Analytic Hierarchy ◽  
Pairwise Comparison Matrix ◽  
Proposed Model ◽  
Assurance Region ◽  
Potential Applications ◽  
Hierarchy Process

Data envelopment analysis (DEA) has been used for obtaining weights for the analytic hierarchy process (AHP), an approach known as DEAHP. This method sometimes identifies more than one decision criterion or alternative as DEAHP-efficient. To overcome this problem, this paper proposes a new approach that not only generates appropriate weights for the decision criteria or alternatives, but also differentiates between DEAHP-efficient decision criteria or alternatives. To this end, we propose a DEA model with an assurance region and a cross-weight model that prioritizes decision criteria or alternatives by considering their most unfavorable weights. Two numerical examples are also provided to illustrate the advantages and potential applications of the proposed model.

Study of Donor Centres in n-InSb due to the Temperature Annealing

2005 ◽  
Vol 480-481 ◽  
pp. 197-200
Author(s):  
Y. Sayad ◽  
A. Nouiri
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Theoretical Study ◽  
Donor Concentration ◽  
Model Based ◽  
Proposed Model ◽  
Kinetics Of ◽  
Best Fit

An increasing of donor centres has been detected in n-InSb when it was submitted to anneal/quench with various annealing temperature (450 °C - 850 °C) and various annealing time (5 - 100 hours). A theoretical study of the kinetics of the conduction conversion of n-InSb at temperature annealing above 250 °C has been made. The present analysis indicates that the donor concentration increases with increasing of annealing time. In order to study this variation and to give a model for donor centres generated, a proposed model based on the simple kinetic is used to fit the variation of donor concentration as a function of annealing time. However, from the best fit of experimental data using the proposed model, the activation energy is determined.

scholarly journals RANCANG BANGUN KEBIJAKAN PENGEMBANGN BUDIDAYA LELE MELALUI PENDEKATAN MODEL DINAMIK

2016 ◽  
Vol 3 (1) ◽  
pp. 153
Author(s):  
Budi Wardono ◽  
Prayudi Budi Utomo
Keyword(s):  
Dynamic Model ◽  
Dynamic Modelling ◽  
Local Production ◽  
Policy Model ◽  
The Third ◽  
Local Product ◽  
Aquaculture Production ◽  
Potential Land

Lele merupakan salah satu komoditas perikanan ekonomis penting yang mendapat prioritasdalam Program Minapolitan Kementerian Kelautan dan Perikanan, terutama di Kabupaten Gunungkidul.Penelitian ini dilakukan pada tahun 2011 yang berlokasi di Propinsi Daerah Istimewa Yogyakarta.Tujuan penelitian adalah menyusun model kebijakan pengembangan perikanan budidaya Ikan Leleuntukmendukung produksi perikanan budidaya melalui pendekatan model dinamik. Teknik analisisini berasumsi bahwa apabila sistem perikanan dipertahankan, permintaan Ikan Lele akan mengalamikenaikan. Hasil simulasi menunjukkan bahwa permintaan meningkat dan puncaknya terjadi pada tahunke 4. Sementara itu, pasokan dari luar daerah terus meningkat pada tahun ke 4 hingga ke 10. Fluktuasiharga terjadi, tahun ke 3 hHarga lele mengalami penurunan akibat banyaknya produksi lokal terjadi padatahun ke-3., namun pPada tahun ke 5 harga mengalami kenaikan akibat kekurangan pasokan. Olehkarena itu, diperlukan kebijakan peningkatan produktivitas dan pendapatan usaha budidaya lele denganmemanfaatkan lahan-lahan potensial maupun meningkatan produktifitas usaha.Title: Constructive Design for Catfish Aquaculture DevelopmentPolicy Through Dynamic Model ApproachCatfish is one of the priority product of fisheries commodity in “Minapolitan” Program introducedby the Ministry of Marine Affairs and Fisheries, particularly in Gunungkidul District, Yogyakarta Province.The study was conducted during 2011 to 2012. .This study aimed to construct the policy model for Catfishaquaculture development to support aquaculture production by using dynamic modelling approache.Technique analysis assumed that Catfish demand will increase when existing fisheries system could bemaintained. Finding shows that the demand sharply increased on the fourth year of project. Meanwhile,Catfish supply from other region would be increase on the fourth year and tenth year. Catfish price hasdecreased on the third year due to over supply of local production. However, Catfish price increasedon the fifth year due to less supply of the local product. Therefore, appropriate strategies needed toencourage increased productivity and farmers income by revitalize the potential land and increasebusiness productivity.

System Transition to the “Eco-Finance” Sustainable Growth: Evidence from Chinese and Russian Oil and Gas Companies

2019 ◽  
Vol 2019 (4) ◽  
pp. 42-59
Author(s):  
Alina Стеблянская ◽  
Vang Zhen ◽  
Nailya Gabdrahmanova ◽  
Uvais Aleroev
Keyword(s):  
Dynamic Model ◽  
Ricci Curvature ◽  
Growth Model ◽  
Oil And Gas ◽  
Dynamic Modelling ◽  
Growth Index ◽  
Oil And Gas Industry ◽  
Sustainable Growth ◽  
System Transition ◽  
Oil And Gas Companies

In this paper, we study how financial sustainable growth matters for environment protection and social responsibility. Financial decisions that take into account long-term social and environmental consequences should be central to the system of financially sustainable growth of oil and gas companies of the world, including Russia and China. Authors present Russia and China oil and gas industry system transition to «Green Finance» sustainable growth model results with interrelation financial, environmental and social factors. Study regarded in the context of economic growth theory, system economics theory and the theory of relativity. It was created Python 3.6. financial sustainable growth model for Russia and China. A dynamic model was built on the basis of the Ricci tensor. For sustainable growth intensity analysis, it was compared Financial sustainable index (FSI), Higgins’ sustainable growth rate (SGR), Ivashkovskaya’ sustainable growth index (SGI), Ivashkovskaya’ sustainable growth index modification (SGImodif) every period indicators’ average values and the graph’ average values of the Ricci curvatures (R). Using the Ricci curvature, the parameters of a dynamic model of sustainable growth are determined for Russia and for China oil and gas industry.Key words: sustainable growth, System Dynamic modelling, Ecological Finance, Ricci Curvature, environmental financial sustainable growth, Financial Sustainable Index (FSI).

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