Control equation of feasible pre-stresses and feasibility of new types of rotating surface cable domes

2021 ◽  
Vol 246 ◽  
pp. 113000
Author(s):  
Jiamin Guo ◽  
Yu zhao ◽  
Sujith Mangalathu ◽  
Guangzhong Liu ◽  
Guangen Zhou ◽  
...  
Keyword(s):  
Rotating Surface ◽  
Control Equation ◽  
Cable Domes

Flow and pressure drop in annular ducts with one rotating surface

2017 ◽  
Author(s):  
C. Y. Nakashima ◽  
S. de Oliveira Jr. ◽  
E. F. Caetano
Keyword(s):  
Pressure Drop ◽  
Rotating Surface

scholarly journals A computational model for hybrid nanofluid flow on a rotating surface in the existence of convective condition

2021 ◽  
pp. 101089
Author(s):  
Azad Hussain ◽  
Mohammed Hamed Alshbool ◽  
Aishah Abdussattar ◽  
Aysha Rehman ◽  
Hijaz Ahmad ◽  
...  
Keyword(s):  
Computational Model ◽  
Hybrid Nanofluid ◽  
Convective Condition ◽  
Nanofluid Flow ◽  
Rotating Surface

scholarly journals Desain dan pemodelan kontrol kinematik pergerakan robot beroda dengan menggunakan 6 roda omni-wheels

JURNAL ELTEK ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 116
Author(s):  
Indrazno Siradjuddin ◽  
Gilang Al Azhar ◽  
Anggit Murdani ◽  
Mukhamad Luqman Muttaqin Faizin
Keyword(s):  
Mobile Robots ◽  
General Equation ◽  
Robot Control ◽  
Sine Wave ◽  
Graphical Form ◽  
Circular Trajectory ◽  
Kinematic Control ◽  
Linear Trajectory ◽  
Mobile Robot Control ◽  
Control Equation

Pengembangan desain kontrol kinematic sangatlah penting dalam pengembangan kontrol untuk robot beroda. Hal ini sangat dibutuhkan mengingat bahwa robot beroda memiliki banyak parameter yang mampu merubah persamaan kontrol kinematiknya terutama pada kontrol kinematik untuk robot beroda dengan jenis roda omnidirectional, baik dari segi jenis roda yang digunakan hingga jumlah roda penggerak yang digunakan. Dengan berbagai macam hal yang dapat merubah persamaan kontrol kinematiknya, maka pada makalah ini dibuat sebuah persamaan kontrol kinematik yang general, yang dapat diaplikasikan untuk berbagai macam roda omnidirectional, serta berbagai jumlah roda yang digunakan. Selain itu persamaan general yang telah dibuat, diaplikasikan untuk menguji respon robot beroda dengan menggunakan 6 buah omni-wheels untuk menguji hasil respon dari persamaan general kontrol yang telah dibuat. Pengujian dilakukan dengan menggunakan simulasi program dengan menggunakan pemrograman dengan menggunakan Bahasa pemrograman python. Hasil yang didapatkan menunjukkan robot mampu bergerak sesuai dengan arah gerak target yang ditentukan, yaitu membentuk pola jalur yang linier serta mampu bergerak membentuk pola lingkaran dan pola setengah gelombang sinus. Hal ini menunjukkan bahwa kontrol kinematik yang dirancang mampu membuat robot bergerak sesuai dengan yang direncanakan. Hasil dari respon robot berupa sinyal kontrol, pola yang dibentuk serta nilai perubahan error disajikan dalam bentuk grafik.   Development of the kinematics control is very important for the development of kinematics control for mobile robots. This is very necessary because mobile robots have a lot of factors that can manipulate the equation of its kinematic control, such as the type of wheels, the number of wheels, etc. With this kind of problem, it necessary to generate a general equation for the robot’s kinematic control, which in this journal we purpose the general equation for the mobile robot control, and we evaluate the outcome by applying the general equation into the 6 omnidirectional robot control. To make a valid statement, we simulate the control to understanding the control outcome by using a python program. The results of the simulation show us that the robot can move as planned, that the robot produces a linear trajectory, circular trajectory, and half sine wave trajectory. Depends on the results, it can be concluded that the proposed kinematics control equation can make the robot moves well as we planned. The results of the respons, the trajectory, and the changes in error values ​​are presented in graphical form

Free Convection Film Boiling Heat Transfer From a Rotating Surface

1992 ◽  
Vol 114 (3) ◽  
pp. 695-702 ◽  
Author(s):  
J. Orozco ◽  
H. Francisco
Keyword(s):  
Free Convection ◽  
Surface Flux ◽  
Film Boiling ◽  
Integral Approach ◽  
Vapor Film ◽  
Experimental Facility ◽  
Layer Model ◽  
Rotating Surface ◽  
Minimum Heat ◽  
Good Agreement

A boundary layer model of laminar, subcooled, free convection film boiling from a rotating sphere has been developed. The conservation equations for the vapor and liquid were simplified, transformed into ordinary differential equations using an integral approach, and solved numerically. The theoretical variation of vapor film thickness with heater temperature and the resulting boiling fluxes were investigated. An experimental facility was built for the purpose of verifying the validity of the theoretical model and good agreement was found between the model and the experimental data at low rpm. The instability of the vapor film near the minimum heat flux for a rotating surface flux was also investigated.

scholarly journals Numerical Assessment on Rotation Effect of the Stagnation Surface on Nanoparticle Deposition in Flame Synthesis

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1361
Author(s):  
Lilin Hu ◽  
Zhu Miao ◽  
Yang Zhang ◽  
Hai Zhang ◽  
Hairui Yang
Keyword(s):  
High Speed ◽  
Deposition Time ◽  
Windward Side ◽  
Leeward Side ◽  
Rotation Effect ◽  
Nanoparticle Deposition ◽  
Numerical Assessment ◽  
O2 Concentration ◽  
Rotating Surface ◽  
Cfd Method

The effect of rotation of the stagnation surface on the nanoparticle deposition in the flame stabilizing on a rotating surface (FSRS) configuration was numerically assessed using CFD method. The deposition properties including particle trajectories, deposition time, temperature and surrounding O2 concentration between the flame and stagnation surface were examined. The results revealed that although flame position is insensitive to the surface rotation, the temperature and velocity fields are remarkably affected, and the deposition properties become asymmetric along the burner centerline when the surface rotates at a fast speed (rotational speed ω ≥ 300 rpm). Particles moving on the windward side have similar deposition properties when the surface rotates slowly, but the off-center particles on the leeward side have remarkable longer deposition time, lower deposition temperature, and lower surrounding O2 concentration, and they even never deposit on the surface when the surface rotates at a high speed. The rotation effect of the stagnation surface can be quantitatively described by an analogous Karlovitz number (Ka’), which is defined as the ratio of characteristic residence time of moving surface to the aerodynamics time induced by flame stretch. For high quality semiconducting metal oxide (SMO) films, it is suggested that Ka’ ≥ 1 should be kept.

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