Industrial high pressure ethylene polymerization initiated by peroxide mixtures: A reduced mathematical model for parameter adjustment

2001 ◽  
Vol 41 (5) ◽  
pp. 711-726 ◽  
Author(s):  
M. Asteasuain ◽  
S. Pereda ◽  
M. H. Lacunza ◽  
P. E. Ugrin ◽  
A. Brandolin
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Ethylene Polymerization ◽  
Parameter Adjustment

Mathematical model for high-pressure tubular reactor for ethylene polymerization

1988 ◽  
Vol 27 (5) ◽  
pp. 784-790 ◽  
Author(s):  
Adriana Brandolin ◽  
Numa J. Capiati ◽  
Jorge N. Farber ◽  
Enrique M. Valles
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Ethylene Polymerization ◽  
Tubular Reactor

Multi-Object Multi-Discipline Probabilistic Design of High-Pressure Turbine Blade-Tip Radial Running Clearance

2013 ◽  
Vol 572 ◽  
pp. 551-554
Author(s):  
Wen Zhong Tang ◽  
Cheng Wei Fei ◽  
Guang Chen Bai
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Optimal Design ◽  
Mechanical System ◽  
High Accuracy ◽  
Probabilistic Design ◽  
High Pressure Turbine ◽  
Surface Method ◽  
Blade Tip ◽  
The Mathematical Model

For the probabilistic design of high-pressure turbine (HPT) blade-tip radial running clearance (BTRRC), a distributed collaborative response surface method (DCRSM) was proposed, and the mathematical model of DCRSM was established. From the BTRRC probabilistic design based on DCRSM, the static clearance δ=1.865 mm is demonstrated to be optimal for the BTRRC design considering aeroengine reliability and efficiency. Meanwhile, DCRSM is proved to be of high accuracy and efficiency in the BTRRC probabilistic design. The present study offers an effective way for HPT BTRRC dynamic probabilistic design and provides also a promising method for the further probabilistic optimal design of complex mechanical system.

Research on Sealing Performance in High Pressure Oil-Free Miniature Air Compressor

2017 ◽  
Author(s):  
Yipan Deng ◽  
Yinshui Liu ◽  
Fan Li ◽  
Pengyun Tian ◽  
Na Miao
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Pressure Distribution ◽  
Research Work ◽  
Piston Rings ◽  
Premature Failure ◽  
Air Compressor ◽  
Sealing Performance ◽  
Rotary Speed ◽  
Discharge Pressure

High pressure oil-free miniature air compressor has an irreplaceable role in some high demand areas such as cooling, scuba diving and pneumatic catapult due to its remarkable advantages such as compacted size, lightened weight and clean output gas. As the important sealing component in the high pressure oil-free miniature air compressor, piston rings hold the properties such as tiny diameter (less than 10mm), high sealing pressure (up to 410 bar) and high surrounding temperature (up to 500K), which make them distinctive from conventional piston rings. A mathematical model was established to simulate the pressure distribution of the compressor chamber, as well as the gap between the sealing rings. Sensitive parameters were considered to investigate their effects on the sealing performance such as the number and the cut size of the piston rings, the suction and discharge pressure and the rotary speed. The mathematical model was verified by comparing to published experimental research work. These work help to reveal the severe non-uniformity of the pressure distribution of different chambers, which were suggested be the primary cause of the premature failure of the sealing rings, thus improving the sealing performance and the service life of the air compressor.

Simulation on an electro-hydrostatic actuator controlled by a high-pressure piezoelectric pump with a displacement amplifier

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bin Wang ◽  
Nanyue Xu ◽  
Pengyuan Wu ◽  
Rongfei Yang
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Design Methodology ◽  
Characteristic Analysis ◽  
Piezoelectric Pump ◽  
Component Level ◽  
Content Type ◽  
Amplification Ratio ◽  
And Performance ◽  
System Characteristics

Purpose The purpose of this paper is to provide a new hydrostatic actuator controlled by a piezoelectric piston pump and to reveal its characteristics. Design/methodology/approach In this paper, a piezoelectric pump with passive poppet valves and hydraulic displacement amplifier is designed as a new control component in a hydrostatic actuator for high actuation capacity. A component-level mathematical model is established to describe the system characteristics. Simulation verification for cases under typical conditions is implemented to evaluate the delivery behavior of the pump and the carrying ability of the actuator. Findings By using the displacement amplifier and the passive distributing valves, simulation demonstrates that the pump can deliver flow rate up to 3 L/min, and the actuator controlled by this pump can push an object weighing approximately 50 kg. In addition, it is particularly important to decide a proper amplification ratio of the amplifier in the pump for better actuation performance. Originality/value The piezoelectric pump presented in this paper has its potential to light hydrostatic actuator. The model constructed in this paper is valid for characteristic analysis and performance evaluation of this pump and actuators.

High-pressure ethylene polymerization initiated by peroxide

1961 ◽  
Vol 55 (161) ◽  
pp. 285-296 ◽  
Author(s):  
Shinjiro Kodama ◽  
Takeo Shimidzu ◽  
Sachio Yuasa ◽  
Tsutomu Kagiya ◽  
Kenichi Fukui
Keyword(s):  
High Pressure ◽  
Ethylene Polymerization

Vibrations of a Double Beam Structure Carrying a High-Pressure Driven Projectile

2019 ◽  
Author(s):  
Alexander Khair ◽  
Bingen Yang
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
High Pressure ◽  
Dynamic Stress ◽  
Beam Theory ◽  
Weapon System ◽  
Beam Structure ◽  
Double Beam ◽  
Simulation Results ◽  
Pressure Driven

Abstract In this paper, a mathematical model of a double beam structure carrying a high-pressure driven projectile is developed for investigation of the physical behaviors of gun barrels during firing. The dynamic response of such a weapon system is particularly interesting when reduction of muzzle vibrations and relevant dynamic stress in the structure is needed to improve the life cycle of the gun. In the model presented, the Timoshenko beam theory is implemented, and realistic characteristics of the physical system are considered. Numerical simulation results are presented for the displacement and rotation of the two beams, and the rigid-body projectile mass.

Research on Water Trajectory to a Railway Tanker Based on High Pressure Water Jet

2013 ◽  
Vol 756-759 ◽  
pp. 4612-4615
Author(s):  
Z.X. Meng ◽  
D.H. Miao ◽  
Z.M. Wang ◽  
Y.J. Qi
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Water Jet ◽  
Cleaning Process ◽  
Water Cleaning ◽  
Cleaning Device ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Set Up

Through analysis of water cleaning trajectory in a railway tanker, a mathematical model of cleaning process is set up. Then the actual cleaning trajectories are obtained, and cleaning rate of high pressure water cleaning to the railway tanker is analyzed. Simulations and experiments show that much water is saved and it also has a great significance to improve the cleaning efficiencies of cleaning device.

Analysis of High Pressure Transients in Water Hydraulic Pipeline Using Matlab/Simulink

2014 ◽  
Vol 621 ◽  
pp. 311-316
Author(s):  
Tian Yang Zhao ◽  
Dan Jiang ◽  
Song Yu ◽  
Jie Wang ◽  
Ping Yang
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Turbulent Flow ◽  
Weighting Function ◽  
Viscous Friction ◽  
Dynamic Friction ◽  
Matlab Simulink ◽  
Pressure Transients ◽  
Water Hydraulic ◽  
The Mathematical Model

Based on the continuity equation and the motion equation of fluid dynamics, a mathematical model of high pressure transients in water hydraulic pipeline is presented. In the model, the friction item is consist of steady friction item and dynamic friction item, using the Darcy-Weisbach equation to solve steady viscous friction item and using four exponential terms instead of weighting function to solve dynamic friction item. By finite difference method accompanied with Matlab/Simulink, an example of high pressure turbulent flow in water hydraulic pipeline is configured so as to simulate the dynamic characteristics of pressure transients. The comparison between the observed result and the simulation result shows the mathematical model of high pressure transients in water hydraulic pipeline with turbulent flow is reasonable.

Sign in / Sign up

Export Citation Format

Share Document