Preliminaries in numerical simulation of isotope separation open-loop processes

2015 ◽  
Author(s):  
Diana M. Sas ◽  
Secara Mihai
Keyword(s):  
Numerical Simulation ◽  
Isotope Separation ◽  
Open Loop

Numerical Simulation and Experimental Validation of Bound Solute Dialysis in Artificial Liver Support Systems

2014 ◽  
Vol 971-973 ◽  
pp. 107-110
Author(s):  
Ying Ying Pei ◽  
Yang Xu ◽  
Yi Ze Sun ◽  
Da Yong Gao ◽  
Wei Ping Ding
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Support Systems ◽  
Open Loop ◽  
Operating Conditions ◽  
Transfer Model ◽  
Artificial Liver ◽  
Liver Support ◽  
Artificial Liver Support ◽  
Theoretical Results

Bound solute dialysis in artificial liver support systems is one of approaches to remove protein-bound toxins from patients with liver disease. In this study, a theoretical mass transfer model for bound solute dialysis considering detailed local ultrafiltration was presented. Then, the numerical simulation was performed and the theoretical results were compared with the experimental data in two dialysis modes under various operating conditions, open-loop dialysis mode (OLM) and closed-loop dialysis mode (CLM).Our results show that the theoretical results agree well with the experimental data. The theoretical model presented here can be used to accurately predict the clearance of albumin-bound toxins and optimize the treatment strategy for clinical application.

Estimation of the Order and Parameters of a Fractional Order Model From a Noisy Step Response Data1

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Mahsan Tavakoli-Kakhki ◽  
Mohammad Saleh Tavazoei
Keyword(s):  
Numerical Simulation ◽  
Fractional Order ◽  
Closed Loop ◽  
Open Loop ◽  
Measurement Noise ◽  
Step Response ◽  
Order Model ◽  
Response Data ◽  
Fractional Order Model ◽  
Simulation Results

This paper deals with integral based methods to estimate the order and parameters of simple fractional order models from the extracted noisy step response data of a process. This data can be obtained from both open-loop and closed-loop tests. Numerical simulation results are presented to verify the robustness of these proposed methods in the presence of the measurement noise.

scholarly journals SIMULATION OF DYNAMICS OF THE SWIVEL CONTROL NOZZLE WITH DOUBLE ELASTIC JOINT

2020 ◽  
pp. 34-44
Author(s):  
Nikolay Zaytsev ◽  
◽  
Andrey Bondarenko ◽  
Dmitriy Pyankov ◽  
◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Degrees Of Freedom ◽  
Movement Control ◽  
Open Loop ◽  
Joint Torque ◽  
Rocket Engines ◽  
Elastic Joint ◽  
Solid Propellant Rocket ◽  
Loop Channel ◽  
Design Characteristics

In order to create control moments for the rocket, the design of modern solid propellant rocket engines uses swivel control nozzles with elastic support joint. The disadvantage of such a joint as the nozzle suspension is the high joint torque, which determines the high requirements for power and effort of steering actuators. In order to reduce these requirements, it is possible to use the design of a swivel control nozzle with a double elastic joint, known as a nozzle with double elastic seal. This nozzle is not used due to its design and operational complexity, particularly due to its tendency to oscillatory processes, as it is a dynamic system with two degrees of freedom. In the article numerical simulation of dynamics of transient modes at deviations on demanded angles of a swivel control nozzle with double elastic joint is considered. For this purpose the approximate nonlinear mathematical model of dynamics of this nozzle constructed by the Lagrange method is used. The results of numerical simulation of transients in the open loop channel of nozzle movement control at abruptly apply the constant effort of steering actuator are given. It is given the method of determination the values of rotation angles of the moving parts of a nozzle and the effort of a steering actuators corresponding to the required angle of rotation of the nozzle. For the given values of the design characteristics of the nozzle and the layout parameters of the nozzle-steering actuators system by numerical simulation it is established that an acceptable oscillation of transients for the nozzle with a double elastic joint can be achieved by increasing the viscosity resistance coefficients in its suspension. Significant influence on damping of oscillations in transient modes of dynamics of the swivel control nozzle of its damping joint moments is also shown.

A generalization of the virtual components concept for numerical simulation of multi-component isotope separation in cascades

2014 ◽  
Vol 120 ◽  
pp. 105-111 ◽  
Author(s):  
Shi Zeng ◽  
Lu Cheng ◽  
Dongjun Jiang ◽  
Valentin Borisevich ◽  
Georgy Sulaberidze
Keyword(s):  
Numerical Simulation ◽  
Isotope Separation
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