scholarly journals Analyzing the Flow Field in the Oil Chamber of a Hydrostatic Guide Rail Used for Ultra-Precision Machining: Numerical Simulation and Performance Optimization

2020 ◽  
Vol 16 (6) ◽  
pp. 1129-1145
Author(s):  
Youxin Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Performance Optimization ◽  
Precision Machining ◽  
Guide Rail ◽  
Ultra Precision ◽  
And Performance

scholarly journals An optimized roots power machine based on negative displacement theory

2020 ◽  
pp. 256-256
Author(s):  
Yanjun Xiao ◽  
Jing Gao ◽  
Jiamin Ren ◽  
Wei Zhou ◽  
Feng Wan ◽  
...  
Keyword(s):  
Flow Field ◽  
Performance Optimization ◽  
Waste Heat ◽  
Internal Flow ◽  
Medium Temperature ◽  
Structural Improvement ◽  
Power Machine ◽  
Before And After ◽  
And Performance ◽  
Field Disturbance

Roots power machine has obvious advantages in low and medium temperature waste heat recovery. The existing roots power machine has the problem of internal flow field disturbance, which seriously affects the power generation efficiency of the power machine. In order to solve the problem of disturbance of the internal flow field of roots power machine, the traditional involute rotor roots power machine is improved, and the roots power machine based on negative displacement involute rotor is proposed. The structure model and turbulence model of roots power machine are constructed, and the internal flow field simulation of roots power machine is realized by computational fluid dynamics. The pressure contour and torque change of roots power machine before and after improvement are compared, and the experimental research on the improved structure is carried out. The results show that the intensity of flow field disturbance in the modified involute rotor roots power machine decreases, and the working performance of the roots power machine improves, which provides a reference for the structural improvement and performance optimization of roots power machine.

Research on Surface Roughness Prediction Model Based on Genetic Algorithm for Optical Ultra-Precision Machining

2007 ◽  
Vol 10-12 ◽  
pp. 369-373
Author(s):  
Jian Jun Du ◽  
Chi Fai Cheung ◽  
Suet To ◽  
Z.Y. Liu
Keyword(s):  
Numerical Simulation ◽  
Genetic Algorithm ◽  
Surface Roughness ◽  
Linear Regression ◽  
Precision Machining ◽  
Mathematics Model ◽  
Simulation Test ◽  
New Model ◽  
Roughness Prediction ◽  
Ultra Precision

In this paper a dynamic non-linear mathematics model is proposed to predict the surface roughness in optical ultra-precision machining, which can be automatically built by evoling computer program of genetic algorithm. The new model can improve the fitting and predicting accuracy, compared with the traditional linear regression model. The numerical simulation test proves the effectiveness and accuracy of new model.

scholarly journals Research on Simulation and Performance Optimization of Mach 4 Civil Aircraft Propulsion Concept

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Min Chen ◽  
Zihao Jia ◽  
Hailong Tang ◽  
Yi Xiao ◽  
Yonghang Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Prediction Model ◽  
Conceptual Design ◽  
Performance Optimization ◽  
Jet Noise ◽  
Aircraft Engine ◽  
Requirement Analysis ◽  
Task Requirement ◽  
Civil Aircraft ◽  
And Performance

Supersonic civil aircraft is of a promising area in the development of future civil transport, and aircraft propulsion system is one of the key issues which determine the success of the aircraft. To get a good conceptual design and performance investigation of the supersonic civil aircraft engine, in this article, a fast, versatile as well as trust-worthy numerical simulation platform was established to analyze the Mach 4 turbine-based combined cycle (TBCC) engine concept so as to be applied to the supersonic civil aircraft. First, a quick and accurate task requirement analysis module was newly established to analyze the mission requirement of the Mach 4 supersonic civil aircraft. Second, the TBCC engine performance simulation model was briefly presented and the number of engines on the supersonic civil aircraft was analyzed, considering single engine inoperative. Third, the Stone model and the DLR method were investigated to estimate the engine jet noise and the NOx emission of the Mach 4 supersonic civil aircraft. Finally, a multiobjective optimization tool made up of a response surface method and a genetic algorithm was developed to optimize the design parameters and the control law of the TBCC engine, in order to make the Mach 4 supersonic civil aircraft engine with better performance, lower noise, and lower emissions. The uniqueness of the developed analysis tool lies in that it affords a numerical simulation platform capable of investigating the task requirement analysis module of the supersonic civil aircraft, engine jet noise prediction model, and the NOx emission prediction model, as well as a multiobjective performance optimization tool, which is beneficial for the conceptual design and performance research of Mach 4 supersonic civil aircraft’s propulsion system.

A Numerical Simulation of Parachute Opening Process Based on ALE Method

2013 ◽  
Vol 390 ◽  
pp. 33-37
Author(s):  
Y. Zhang ◽  
H. Cheng ◽  
L. Yu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Structure Change ◽  
Field Change ◽  
Finite Mass ◽  
Ale Method ◽  
And Performance ◽  
Opening Process

In this paper, the parachute opening process of finite mass situation was simulated based on ALE method. The results of structure change, the flow field change and some important aerodynamic data were obtained. Compared with the experiment, it can be found that the opening process was same with the actual opening. This method was useful in parachute designing and performance analyzing.

Three-dimensional flow field numerical simulation and performance analysis for a new type canned motor pump

2013 ◽  
Vol 227 (12) ◽  
pp. 2825-2833 ◽  
Author(s):  
Cui Jianzhong ◽  
Xie Fangwei ◽  
Liu Qingyun ◽  
Wang Cuntang ◽  
Zhang Xianjun ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Outer Diameter ◽  
Small Flow ◽  
New Type ◽  
Fluent Software ◽  
And Performance ◽  
Canned Motor

A new type of canned motor pump with extensive application value is designed, researched, and developed in this article. In order to grasp the characteristic of the internal flow field of the pump, the internal flow field is simulated numerically by using FLUENT software with the standard k–ɛ turbulence model, SIMPLEC algorithm, and multiple reference frame model. The distribution of the pressure and velocity of the flow in the canned motor pump is analyzed in different working conditions. Moreover, the head and efficiency of the pump is predicted based on the simulation results, which show that the head and efficiency of the canned motor pump in small flow rate will be better. The performance of the canned motor pump can be improved by appropriately increasing the outer diameter of the impeller and the base diameter of the volute. The results of the numerical simulation are in accord with theoretical analysis, which verifies the correctness of the numerical simulation. The investigations have important theoretical guiding significance for the design of the canned motor pump.

Numerical Simulation and Performance Optimization of the Gain Characteristic of EY-CDWA Optical Waveguide Amplifier

2011 ◽  
Vol 345 ◽  
pp. 35-40
Author(s):  
Xiang Bao Yin ◽  
Xiao Ping Li ◽  
She Li
Keyword(s):  
Numerical Simulation ◽  
Optical Waveguide ◽  
Performance Optimization ◽  
Pump Wave ◽  
Level Structure ◽  
Wave Length ◽  
Optimization Scheme ◽  
Energy Level Structure ◽  
And Performance ◽  
Gain Characteristic

The gain model of the Yb-Er codoped optical waveguide amplifier as well as the gain equation has been established based on the analysis of energy level structure of Yb-Er codoped system and the related transition utilizing the rate and transmission equations, and then simulation of the gain characteristic has been carried out. Some most important parameters influencing the gain of the optical waveguide amplifier are discussed and the correlative conditions are optimized. Through numerical simulation, the parameter optimization scheme has been proposed, with which the pump wave length, power and the gain of the amplifier are optimized synchronously, and the maximum gain under the optimum length is obtained. Experimental results show good accordance with the numerical simulation.

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