Numerical Analysis on the Performance of the Solid Solar Particle Receiver With the Influence of Aerowindow

2008 ◽  
Author(s):  
Zhuoqi Chen ◽  
Yitung Chen ◽  
Taide Tan
Keyword(s):  
Solid Particle ◽  
Particle Temperature ◽  
Research Work ◽  
Three Dimensional ◽  
Fluid Phase ◽  
Injection Velocity ◽  
Average Particle ◽  
Three Dimensional Model ◽  
Particle Radiation ◽  
Solar Particle

In this research work, a three dimensional model of the solid solar particle receiver (SPR) with the influence of aerowindow is analyzed. The free-falling down particles will form a solid particle curtain and be directly heated up by the reflected concentrating solar energy which passes through the aperture of the cavity. The mass, momentum and energy exchange between the solid particle phase and gas fluid phase are simulated by the two-way coupling Euler-Lagrange method. A discrete ordinate radiative transfer method has been applied to study the coupling of radiative heat transfer and the falling particle curtain. The realizable κ-ε model is used in the investigation of turbulence flow. In order to predict the performance of the SPR, the aerodynamic behavior of the particles and thermal interaction, which include particle-particle radiation, particle-wall radiation, particle-air convection, and air-wall convection are analyzed and demonstrated in this work. All the investigation on the simulation model is focusing on optimizing the performance of the SPR. The parametric studies of the performance of the SPR with aerowindow are investigated under the different working conditions, such as air injection velocity, particle mass flow rate, and the efficiency of the SPR and exit average particle temperature are compared upon these conditions.

Analysis Method for Studying Groundwater under a Church

2016 ◽  
Vol 861 ◽  
pp. 263-270
Author(s):  
M. Eugenia Torner ◽  
Ángeles Mas ◽  
Carlos Lerma ◽  
Enrique Gil ◽  
Jose Vercher ◽  
...  
Keyword(s):  
Seventeenth Century ◽  
Ground Penetrating Radar ◽  
Research Work ◽  
Three Dimensional ◽  
Analysis Method ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Ground Penetrating ◽  
The Church ◽  
Main Entrance

The Church of Asunción of Llíria (Valencia, Spain) is one of the best examples of the Valencian Baroque of the seventeenth century. This research is based on the study of the building from an urban, historical, and especially, a constructive view. The location of this particular church is unique because it is embedded in a mountain. First, some excavations were made into the mountain before the construction of the church started. Thus, there is a slope between the main entrance of the church and the rear. This research work provides the analysis of the ground humidity throughout the Ground Penetrating Radar (GPR) technique. We have analysed the subsoil of the whole church by various cuts or paths. Longitudinal and transversal measurements allowed us to produce a three-dimensional model of the land on which the church stands. We have also analysed the homogeneity or heterogeneity of the subsoil in each area and the presence of certain ground water routes. The rising moisture has been analysed on the walls and pillars of the church. To this end, a moisture analyser has been employed to monitor the moisture content over a period of six months. With this information, it was possible to identify points that are systematically more humid.

scholarly journals Modeling Gait Patterns of a Patient with Orthopedic Injury Using an Exoskeleton

2020 ◽  
Vol 23 (6) ◽  
pp. 176-188
Author(s):  
S. F. Yatsun ◽  
Khalil Hamed Mohammed Hamood Al Manji ◽  
A. A. Postolny ◽  
A. S. Yatsun
Keyword(s):  
Control System ◽  
Ankle Joint ◽  
Research Work ◽  
Three Dimensional ◽  
Lower Limbs ◽  
Movement Trajectory ◽  
Joint Movement ◽  
Three Dimensional Model ◽  
Orthopedic Injury ◽  
Wide Range

Purpose of reseach. The paper describes the EXOLITE-REHAB rehabilitation robotic complex which makes it possible to do rehabilitation exercises of lower limbs of patients by performing leg lifting, verticalization, squats and other types of movement. In many countries, research work is underway to create devices that allow a person to move in space when the musculo-skeletal system is damaged.  Therefore, the purpose of this article is to study and set the basic regularities and algorithms based on mathematical models describing the controlled movement of the lower limbs exoskeleton by the example of modeling the movement of the exoskeleton's ankle joint.Methods. The key feature of the complex is the use of a follower-up control system that allows us to provide a prescribed movement of the human ankle joint with a high degree of accuracy in a wide range of parameters’ changes. Methods of mathematical modeling of the ankle joint movement are applied, taking into account their subsequent possible use in modeling the movement of exoskeleton links.Results. A kinematic setting of the ankle joint movement trajectory  is used in order to simulate the operation of a robotic system. In order to find the vector of generalized coordinates, the inverse kinematics problem is solved using the vector-matrix method with the application of Jacobian matrix. The results of numerical simulation show high convergence and adequacy of the proposed method.Conclusion. The article considers the method of using a follower-up control system that has a sufficient degree of accuracy of copying the trajectory. The results of modeling the follower-up control system of the EXOLITE-REHAB rehabilitation exoskeleton, working according to the developed algorithm, show that it is able to repeat the required trajectory with sufficient accuracy. In the future, we plan to study the system more deeply on a three-dimensional model with electric drives. 

scholarly journals 3D MODELLING OF THE NEGRO TOWER FOR ITS COMPREHENSIVE ANALYSIS AND A CONSERVATION PROPOSAL

2020 ◽  
Vol XLIV-M-1-2020 ◽  
pp. 343-349
Author(s):  
J. García-León ◽  
P. E. Collado Espejo ◽  
F. Fantini ◽  
F. J. Jiménez González
Keyword(s):  
Laser Scanning ◽  
Research Work ◽  
Three Dimensional ◽  
Rural Environment ◽  
3D Laser Scanning ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
The Social ◽  
Architectural Characteristics ◽  
Comprehensive Study

Abstract. The Negro Tower, in El Algar, Cartagena (Region of Murcia, Spain), is a building which dates to 1585. It is a tower built in a rural environment, inland from the coast, to alert and protect the population from pirate attacks. It was part of the network of watchtowers and defense posts along the coast of Murcia built between the sixteenth and seventeenth centuries. The tower is protected as a historical monument, but its state of conservation is very poor. For this reason, a comprehensive study has been carried out to ensure its correct restoration and future conservation. Historical and constructive analysis has allowed us to discover the social, cultural and architectural characteristics of the tower. Digital photogrammetry and 3D laser scanning compatible with classic topography have been used for the graphic survey of the tower. All this information has permitted the elaboration of thorough three-dimensional modelling and the proposal of a volumetric recomposition of the tower. The presentation will set out the working methodology followed as well as the important results achieved. This research work aims to contribute to the recognition and correct conservation of the Tower. The graphic survey and the three-dimensional model obtained will allow the recovery of the tower and its integration into the natural environment.

Flexible Multibody Simulation Approach in the Analysis of Friction Winder

2010 ◽  
Vol 97-101 ◽  
pp. 2594-2597 ◽  
Author(s):  
Yi Liu ◽  
Guo Ding Chen ◽  
Ji Shun Li ◽  
Yu Jun Xue
Keyword(s):  
Research Work ◽  
Three Dimensional ◽  
Flexible Body ◽  
Multibody Simulation ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Body Dynamics ◽  
Flexible Body Dynamics ◽  
Dynamics Characteristic ◽  
Dynamics Method

The main objective of this study was to model and simulate a multi-flexible-body three-dimensional model for researching the Multi – rope Friction Winder system. By introducing the multi-flexible-body dynamics method, a multi-flexible-body virtual prototype of the winder is been builded with the RecurDyn software package. Kinematics and dynamics characteristic date are obtained by computer-aided dynamic simulation of virtual Multi – rope friction winder. The result is in accord with theoretical analysis. The research work will provide a powerful tool and useful method for the design of economic and credible elevator system. The approach can be generalized to analysis other flexible drive fields.

scholarly journals An Efficient Dynamic Modeling Technique for a Central Tie Rod Rotor

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jingze Liu ◽  
Qingguo Fei ◽  
Shaoqing Wu ◽  
Zhenhuan Tang ◽  
Sanfeng Liao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Experimental Testing ◽  
Research Work ◽  
Three Dimensional ◽  
Element Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Mass Model ◽  
One Dimensional ◽  
Three Dimensional Finite Element

Compared with the three-dimensional rotor model for a central tie rod rotor, an equivalent one-dimensional model can greatly improve the computational efficiency in rotor dynamics analysis with a certain accuracy. However, little research work can be found on improving the modeling accuracy of one-dimensional models using experimental data. In this paper, a one-dimensional discrete mass model considering pretightening force is proposed for central tie rod rotors to achieve the purpose of both efficient and accurate modeling. Experimental testing and three-dimensional model analysis are used as reference and verification approaches. A sensitivity-based method is adopted to update the proposed one-dimensional model via minimizing the error in the critical speed comparing with the corresponding three-dimensional finite element model which has been verified by a modal test. Prediction of damped unbalanced response is conducted to show the practicality of the updated one-dimensional model. Results show that the method presented in this research work can be used to simulate a complex preloaded rotor system with high efficiency and accuracy.

scholarly journals HUMAN BODY MODELING TECHNOLOGIES FOR E-COMMERCE SYSTEMS

2021 ◽  
pp. 35-40
Author(s):  
Bogdan Litvinov ◽  
Mariia Bilova
Keyword(s):  
Human Body ◽  
3D Model ◽  
Research Work ◽  
Three Dimensional ◽  
The Body ◽  
Three Dimensional Model ◽  
Shopping Cart ◽  
Basic Set ◽  
Realistic Representation ◽  
The Face

Relevance of the research work is the analysis of the main features of 3D modeling for further implementation in e-commerce. Namely, the features ofcreating a human body 3D model with the ability to edit personal settings of individual parts of the body, as well as a basic set of clothes to provide amore realistic representation of the model. The features of the 3D model in general were considered in this article. The mathematical analysis of the 3Dgraphics rendering on the 2D monitor and the possibilities of control and editing of such models have been presented. The developed software productallows the user to create an anatomical three-dimensional model of the human body and then adjust it to his needs. The user can apply on createdmodel variety of settings, namely more than 15 different views, with a full package of changes. It is possible to change the size, color of hair,eyebrows, eyes, face, body, legs. Also, the user is able to select the levels of skeletal frame views and additionally can select different backgrounds toprovide a more realistic representation of the model in space. Additional functionality was implemented for more flexible configuration of the model’sface. The user can pre-determine points to select directions or sizes of different parts of the face using settings, displayed on the mouse or touchpadcontrol. After adjustments, the user is able to manage the clothes that he had saved in the shopping cart from the online store, from which he laterproceeded to the online fitting. After the fitting the user can test the creation of animations in 360 degrees of free movement. Finally, the user can go tothe store to pay for the items he left in the shopping cart. Developed software allows improving main metrics of the on-line stores, which has a positiveimpact on increasing the growth of earnings.

Three-Dimensional Model for Virtual Surgical Simulation, during Complex Skull Base Surgery and Aneurysm Surgery

Skull Base ◽  
2008 ◽  
Vol 18 (S 01) ◽  
Author(s):  
Akio Morita ◽  
Toshikazu Kimura ◽  
Shigeo Sora ◽  
Kengo Nishimura ◽  
Hisayuki Sugiyama ◽  
...  
Keyword(s):  
Skull Base ◽  
Surgical Simulation ◽  
Skull Base Surgery ◽  
Three Dimensional ◽  
Aneurysm Surgery ◽  
Dimensional Model ◽  
Three Dimensional Model
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