scholarly journals Preliminary Study on High Speed Spindle Variable Preload System with Hydraulic System

2017 ◽  
Vol 10 (4) ◽  
pp. 411-416
Author(s):  
Jong-Jin Baek ◽  
Jae-Soo Kim
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Preliminary Study

scholarly journals Design of an on-line check device for safety valve

2018 ◽  
Vol 232 ◽  
pp. 01045
Author(s):  
Zhipeng Yan ◽  
Qing Li ◽  
Muda Jin ◽  
Haijian Zhong
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Safety Valve ◽  
Motor Drive ◽  
Pressure Relief ◽  
Type Safety ◽  
On Line ◽  
Spring Type ◽  
Pulling Force ◽  
Upper Computer

As the main pressure relief component of the tanker, the spring type safety valve is indispensable for its periodic verification. An on-line check device is designed for the check problem of the safety valve. The check device is divided into mechanical structure, program control, motor drive, tension detection, displacement measurement, upper computer, etc., and the safety valve is verified according to the safety valve check principle and the determination method. Compared with the check device that uses the hydraulic system to provide the pulling force, the device has the advantages of simple operation, high speed, convenient disassembly, strong applicability, and the like, and has certain market application prospects.

Modeling and Simulation Research of Hydraulic Cylinder Speed Control System Based on High-Speed On-Off Valve

2012 ◽  
Vol 590 ◽  
pp. 161-164
Author(s):  
Qin He Gao ◽  
Wen Liang Guan ◽  
Hai Zhou Song ◽  
Zhi Yong Yang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
High Speed ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Simulation Research ◽  
Parallel Application ◽  
Proposed Model ◽  
Speed Control System ◽  
Small Flow

Application of high-speed on-off valve in the hydraulic cylinder speed control system was researched in this paper. Series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed. Model of high-speed on-off valve and hydraulic circuit were established to carry out simulation. The speed and acceleration curve of hydraulic cylinder were achieved by the means of simulation with Simulink. The simulation curves show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

High speed vocal fold imaging using smartphone-based laryngoscope: A preliminary study

2020 ◽  
Author(s):  
YoungKyu Kim ◽  
Jeongmin Oh ◽  
Seung-ho Choi ◽  
Ah Ra Jung ◽  
Yoon Se Lee ◽  
...  
Keyword(s):  
Vocal Fold ◽  
High Speed ◽  
Preliminary Study

Preliminary Study on Stability Parameters of Semi-Displacement Ships

2018 ◽  
Vol 874 ◽  
pp. 105-113
Author(s):  
Wolter R. Hetharia
Keyword(s):  
Froude Number ◽  
High Speed ◽  
Stability Evaluation ◽  
Stability Parameters ◽  
Passenger Ships ◽  
Speed Range ◽  
Preliminary Study ◽  
The Stability ◽  
Weather Criterion ◽  
Engine Power

Semi-displacement passenger ships operate at the speed range of 19 to 23 knots or Froude number Fn of 0.50 to 0.75. Those ships need higher engine power to maintain their speeds. The efforts should be made to minimize their higher engine powers. Most experts worked to minimize the engine power for most merchant ships. In their works, the initial metacentric (GMO) at departure condition was taken as constraint to represent stability parameters. However, this is not a general case for semi-displacement passenger ships. In this study, a parent semi-displacement passenger was designed and modified. Stability parameters were computed and evaluated as required by the rules IMO-HSC. In addition, one existing high speed passenger ship was evaluated for stability evaluation as reference also. It was found that the stability parameters at large angles of inclination such as: weather criterion, angle of GZmaxand others are more critical compared to GM0. Also, the stability parameters when ship is at arrival condition are more critical compared to those at departure condition. The study resumed that the application of criterion GM0≥ 0.15 m at optimization process of semi-displacement passenger ships should be considered again for the future.

Design of Hydraulic Cylinder Speed Control System Base on High-Speed on-Off Valve

2012 ◽  
Vol 220-223 ◽  
pp. 1661-1664
Author(s):  
Qin He Gao ◽  
Wen Liang Guan ◽  
Hai Zhou Song ◽  
Zhi Yong Yang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
High Speed ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Pulse Control ◽  
Parallel Application ◽  
Speed Control System ◽  
Small Flow ◽  
The Impact

In order to study the Application of high-speed on-off valve in the hydraulic cylinder speed control system, series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed to control the speed of hydraulic cylinder. The duty cycle of pulse control signal was changed according to the displacement of hydraulic cylinder to control the speed of hydraulic cylinder and weak the impact. The simulation curve compared with the experimental results show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

Hydraulic System Design and Simulation of High-Speed Railway Dynamic Test System Excitation Device

2012 ◽  
Vol 271-272 ◽  
pp. 953-957
Author(s):  
Liang Cai Zeng ◽  
Fei Long Zheng ◽  
Yuan Wan ◽  
Qiang Hua Xi
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Digital Simulation ◽  
Dynamic Test ◽  
Hydraulic Cylinder ◽  
High Amplitude ◽  
Test System ◽  
Excitation System ◽  
High Speed Railway ◽  
Exciting Frequency

The existing hydraulic excitation mode of valve controlled cylinder or pump controlled motor used in the excitation device of high-speed railway dynamic test system is difficult to meet the requirements of high exciting frequency, high exciting force and high amplitude. To solve these problems, the paper puts forward a bicyclic surface hydraulic cylinder, and designs the corresponding electro-hydraulic servo excitation system. According to the test system parameters，it establishes the mathematical model of the hydraulic system. It uses Matlab/Simulink to carry out theoretical analysis and digital simulation and uses PID Tuner to adjust the PID controller parameters. The simulation results show that the hydraulic excitation system designed meets the performance requirements of the high-speed railway dynamic test system excitation device.

A preliminary study of size reduction of powders in a single-vessel pharmaceutical processor

2000 ◽  
Vol 214 (3) ◽  
pp. 251-253
Author(s):  
S A MacGregor ◽  
L B Newnes ◽  
M Li ◽  
J N Staniforth ◽  
M J Tobyn ◽  
...  
Keyword(s):  
Initial Phase ◽  
High Speed ◽  
Particle Diameter ◽  
Size Reduction ◽  
Minimum Size ◽  
Final Particle ◽  
Single Vessel ◽  
Preliminary Study

The size reduction performance of a pneumatically driven single-vessel pharmaceutical processor is described. Two materials were considered, namely commercially available granular lactose (CAGL) and high-speed mixer granulator lactose (HSMGL). In both cases there is an initial phase in which the particle diameter is reduced rapidly. The rate at which the size reduction decreases is reduced with time. The final particle diameter was found to be dependent on the material being processed. In the case of CAGL, the minimum size achieved was 150 μm, while in the case of the HSMGL the final particle diameter was 100 μm.

Sign in / Sign up

Export Citation Format

Share Document