Parameter Optimization for Dynamic Performance of a New Hydraulic Relief Valve in Coal Mine

2018 ◽  
Author(s):  
Wang Chuanli ◽  
Hao Fei ◽  
He Tao ◽  
Zhou Dawei ◽  
Yang Linjian ◽  
...  
Keyword(s):  
Parameter Optimization ◽  
Coal Mine ◽  
Dynamic Performance ◽  
Relief Valve

Parameter Optimization of Virtual Impedance for Parallel Inverter

2014 ◽  
Vol 986-987 ◽  
pp. 1973-1976
Author(s):  
Ping Wang ◽  
Liu Yang
Keyword(s):  
Parameter Optimization ◽  
Dynamic Performance ◽  
Design Methods ◽  
New Method ◽  
Conventional Design ◽  
Equivalent Impedance ◽  
Novel Method ◽  
Virtual Impedance ◽  
Frequency Curves ◽  
Parallel Inverter

This paper deals with parameter optimization of virtual impedance of parallel inverter. Conventional design methods determine parameters by observing the changes of amplitude-frequency and phase frequency curves of the equivalent impedance. However, those methods always neglect the dynamic performance of inverters in parallel. This paper proposes a novel method to optimize the coefficients of virtual impedance and experiments show that new method improves the dynamic performance of parallel inverter effectively, as well as stability and flexibility.

Parameter Optimization of PID Controller Based on an Improved Particle Swarm Optimization for the Induction Motor

2011 ◽  
Vol 130-134 ◽  
pp. 1938-1942
Author(s):  
Xia Bo Shi ◽  
Wei Xing Lin
Keyword(s):  
Particle Swarm Optimization ◽  
Induction Motor ◽  
Parameter Optimization ◽  
Pid Controller ◽  
Dynamic Performance ◽  
Particle Swarm ◽  
Motor Speed ◽  
Swarm Optimization ◽  
Improved Particle Swarm Optimization ◽  
Ipso Algorithm

This paper presents a new approach of PID parameter optimization for the induction motor speed system by using an improved particle swarm optimization (IPSO). The induction motor speed is changed by the stator voltage controlled with PID controller. The performance of PID controller based on IPSO is compared to Linearly Decreasing Inertia Weight (LIWPSO). Simulation results demonstrate that the IPSO algorithm has better dynamic performance, higher accuracy and faster convergence and good performance for the PID controller.

Research and Design for Relief Valve with Level 2 Pressure Regulating Based on AMEsim

2012 ◽  
Vol 246-247 ◽  
pp. 754-758
Author(s):  
Ren Yu Feng ◽  
Hai Lan Wang ◽  
Zhen Jie Hao
Keyword(s):  
Dynamic Performance ◽  
Valve Design ◽  
Relief Valve ◽  
Theoretical Support ◽  
Product Test ◽  
Simulation Results ◽  
Test Verification ◽  
The Impact ◽  
Research And Design ◽  
Level 2

By the relief valve with level 2 pressure regulating structures AMEsim model to analyze the impact of various factors on the valve dynamic performance reasons; optimize the parameters of these factors in the theoretical support and click here to design methods of productionthe product test verification. The results prove the effectiveness of the proceeds of the correctness of the simulation results and the valve design and production process.

Modeling of Drive System for Trackless Rubber Tyre Electric Vehicle

2013 ◽  
Vol 373-375 ◽  
pp. 43-49
Author(s):  
Chuan Wei Zhang ◽  
Ying Ying Wan ◽  
Rui Fang Zhang ◽  
Zong Hu Xi
Keyword(s):  
Vector Control ◽  
Induction Motor ◽  
Electric Vehicle ◽  
Coal Mine ◽  
Dynamic Performance ◽  
Basic Structure ◽  
Drive System ◽  
Field Oriented Vector Control ◽  
Control System Model ◽  
Ac Induction Motor

Owing to harmful gas emissions and high accident rate of diesel engine in the coal mine trackless auxiliary transport, the spring of trackless rubber tyre electric vehicle powered by the battery pack comes. This paper considers the drive system to improve the performance of the electric vehicle. In order to adapt to the complex environment of coal mine, the analysis of basic structure for trackless rubber tyre electric vehicle was based on the three-phase AC induction motor. After elaborating the vector control theory of induction motor, the field-oriented vector control system model of trackless rubber tyre electric vehicle drive system with induction motor rotor was built in Matlab/Simulink. The simulation shows that the proposed control algorithm permits the drive system to achieve good steady and dynamic performance.

Improving Rotordynamic Performance of an Axial Flow Compressor With Two-Lobe Bearings Using Nonlinear Constraint Parameter Optimization

2011 ◽  
Author(s):  
Henning Ressing ◽  
Sebastian Kukla
Keyword(s):  
Parameter Optimization ◽  
Dynamic Performance ◽  
Axial Flow ◽  
Rotor Dynamics ◽  
Nonlinear Constraint ◽  
Design Variables ◽  
Rotor Bearing ◽  
Flow Compressor ◽  
Rotor Dynamic ◽  
Bearing System

Bearings are a key factor in achieving a good rotor dynamics performance for turbo machinery. Large compressors, steam and gas turbines for industrial applications are generally equipped with journal bearings either as tilting pad or multi-lobe bearing type. Here bearing parameters such as bearing geometry, bearing load or oil viscosity significantly alter bearing behavior and influence the rotor dynamics of the entire rotor-bearing system. In order to find an optimal set of bearing parameters for a given rotor-bearing system a nonlinear parameter optimization approach is employed. The rotor-bearing system is parameterized using bearing width, clearance and preload as design variables, since they represent design parameters that can be modified without significantly influencing the rotor design as a whole. The set of design variables is further constraint to stay within feasible limits of bearing design. The objective function is defined as a quantitative measure of rotor dynamic performance evaluating the distance from required separation margins with respect to rotor critical speeds based on API 617 7th Ed. In order to compute the objective function based on the design variables the bearing code ALP3T, solving Reynolds equations for the bearing fluid film, is used to compute the required stiffness and damping coefficients as input to the rotor dynamics program. The rotor dynamics performance is then evaluated using the rotor dynamics code SR3 based on the transfer matrix method. Both programs have been developed by the University of Braunschweig and are defacto industry standard within the German turbo machinery industry. The two programs are coupled and the nonlinear constraint optimization problem is solved using MATLAB’s optimization toolbox. The feasibility of this method is discussed based on an example of an axial flow compressor using two-lobe bearings. It is shown that a significant improvement in rotor dynamic performance can be achieved when compared to previous bearing selections for similar compressor designs and that the approach is suitable for a real-life engineering environment.

High Speed ​​Gear Parametric Modeling and Dynamic Analysis

2014 ◽  
Vol 945-949 ◽  
pp. 849-852
Author(s):  
Yin Yin Liu ◽  
Man Chen Xiong ◽  
Quan Li
Keyword(s):  
Parameter Optimization ◽  
High Speed ◽  
Dynamic Performance ◽  
Parametric Modeling ◽  
Solid Model ◽  
Basic Principles ◽  
Modeling Technology ◽  
Cylindrical Gears ◽  
Adams Software ◽  
Design Calculations

In order to solve high-speed gear parametric solid modeling technology, improve the accuracy of design calculations gear, based the involute of inclined cylindrical gears tooth profile formed the basic principles, in the UG software system and through VB programming using UG’s parameter expression to modeling, constructing parameterized solid model of locomotive traction gear and the modeling of transmission. Analyzing and calculating with ADAMS software that the dynamic performance of gear system, provides the basis for speed ​​gear strength and parameter optimization.

The Parameter Optimization and Field Application of Truss Cable Support System in a Thick Fragmental Coal Seam Roadway

2012 ◽  
Vol 524-527 ◽  
pp. 382-386
Author(s):  
Xiao Kang Zhang ◽  
Hong Jun Jiang ◽  
Fu Lian He ◽  
Ming Yue Weng
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Parameter Optimization ◽  
Support System ◽  
Coal Mine ◽  
Field Application ◽  
Simulation Software ◽  
Surrounding Rock ◽  
Set Up ◽  
Main Support

For the support problem of set-up room to be 7.8m wide with thick and broken coal roof in Pangpangta coal mine, the truss cable support system is adopted to control the set-up room surrounding rock. The main support parameters, such as cable length, cable angle and distance between orifice and side of the truss cable support system are simulated and optimally designed by using numerical simulation software FLAC3D, by which the support scheme is designed reasonably. The support scheme is successfully tested at set-up room No. 10101 in Pangpangta mine. The set-up room deformation is small, and the support system is safe and reliable. This kind of support technology can be widely used in the similar set-up rooms.

Dynamic Performance of Spring-Loaded Pressure Relief Valve for High Temperature and High Pressure Steam

2016 ◽  
Author(s):  
Liu Yang ◽  
Chao Wang ◽  
Jian Zhang ◽  
Ronghua Lu ◽  
Xinhai Yu
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Dynamic Performance ◽  
Steam Pressure ◽  
Pressure Relief Valve ◽  
Small Scale ◽  
Relief Valve ◽  
Pressure Relief ◽  
High Pressure Steam ◽  
Pressure Steam

In this study, the complete dynamic performance of the high temperature and high pressure steam pressure relief valve (HTHP PRV) from pop up to reseating was simulated by CFD software which combined with moving mesh capabilities and multiple domains. An experimental setup was established for the testing of HTHP PRV in accordance with the standard of ASME PTC 25. The dynamic performance of HTHP PRV was recorded accurately. For the transient simulation of HTHP PRV, a domain with opening boundaries connected to the outlet of PRV was proposed to avoid the direct definition of the pressure at the PRV outlet and handle the critical flow. It also can describe the surrounding flow field and help us to understand the influence of the PRV discharge on the environment better. The simulation results were verified by experimental ones. The resultant force on the disk and the lift were monitored and analyzed. A detailed contour of the compressible steam flowing through the HTHP PRV was obtained, including small scale flow features in the back pressure chamber. The effect of the adjusting sleeve on the dynamic performance of HTHP PRV was also investigated in details. The blowdown increases linearly by 0.163% with the adjusting sleeve moves by each millimeter in the direction of departing from the disk. This study sheds a light of understanding of the dynamic characteristics of HTHP PRV.

scholarly journals Analysis of Dynamic Characteristics of Pressure-Regulating and Pressure-Limiting Combined Relief Valve

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Rui Shi ◽  
Chuanli Wang ◽  
Tao He ◽  
Tian Xie
Keyword(s):  
Response Time ◽  
Dynamic Characteristics ◽  
Structural Parameters ◽  
Dynamic Performance ◽  
Characteristic Analysis ◽  
Relief Valve ◽  
Effective Force ◽  
Fluid Resistance ◽  
Large Pressure ◽  
Pressure Stabilization

Aiming at the problem of the lack of a cooperation mechanism of combined relief valves, this paper proposes a new pressure-regulating and pressure-limiting combined relief valve. Combined with the ordinary relief valve dynamic characteristic analysis method, the dynamic model of the combined relief valve under normal working conditions was established, and its dynamic characteristics were simulated using Simulink. The results showed that the multi-pressure stabilization design of the combined relief valve improves its usability and stability. Under the same structural parameters, the overshoot of the combined relief valve was 5.7%, and the response time was 12 ms, which is better than the ordinary relief valve. Besides, it effectively improves the instability problems, such as the vibration and the large pressure fluctuation of the ordinary relief valve under high pressure and large flow conditions. When the sum of the effective force area on the upper side of the flange of the pressure-regulating valve core and the area of the tail vertebra is equal to the effective force area of the lower side of the flange of the pressure-regulating valve core, the dynamic performance of the relief valve is optimal. For example, if the effective force area under the flange is 1.8 cm2, then the inlet pressure overshoot is 2.8%, and the response time is 10 ms. An appropriate volume of the sensitive cavity, the quality of the valve core, and the fluid resistance of the pressure relief valve are factors that can effectively improve the dynamic performance of the pressure-regulating and pressure-limiting combined relief valve.

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