Dynamic Response of the Pipe Conveying Fluid with the Pressure Pulsation

2015 ◽  
Vol 1094 ◽  
pp. 491-494 ◽  
Author(s):  
Hong Bo Zhai ◽  
Jian Jun Su ◽  
Xiao Min Yan ◽  
Wei Liu
Keyword(s):  
Dynamic Response ◽  
Pressure Pulsation ◽  
Fluid Pressure ◽  
Response Characteristic ◽  
Pipe Conveying Fluid ◽  
Hydraulic Power ◽  
Working Pressure ◽  
Pipe System ◽  
Output Pressure ◽  
Conveying Fluid

The dynamic response characteristic of the pipe conveying fluid was researched with the fluid pressure pulsation in this article. For some hydraulic power pipe system, formed the mathematic models and the transfer matrices of the main hydraulic elements based on the fluid network algorithm, deduced the calculation formulae of input-output pressure pulsation, gained the transitive relationship of the fluid flow pulsation and pressure pulsation, and then studied the pressure pulsation amplitude of the hydraulic power pipes with different working pressures. This study, which analyzed the dynamic response of the pipe conveying fluid and discussed the feasibility of increasing the working pressure, is valuable for the design and the application of the pipes conveying fluid.

Active Control of Fluid Pressure Pulsation in Hydraulic Pipe System by Bilateral-Overflow of Piezoelectric Direct-Drive Slide Valve

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Guan Changbin ◽  
Jiao Zongxia ◽  
Wu Shuai ◽  
Shang Yaoxing ◽  
Zheng Fanggang
Keyword(s):  
Active Control ◽  
High Speed ◽  
Pressure Pulsation ◽  
Control Method ◽  
Fluid Pressure ◽  
Slide Valve ◽  
Single Frequency ◽  
Direct Drive ◽  
Dual Frequency ◽  
Pipe System

In this paper, a novel active control of fluid pressure pulsation (ACFPP) is proposed, which meets the need of the high-pressure and high-speed hydraulic pipe system. A piezoelectric direct-drive slide valve (PDDSV) is designed and used as the active vibration absorber. Two ports of the PDDSV both connect to a bypass near the pump outlet and the other two ports both connect to the oil tank. By the bilateral-overflow through the shoulder of the PDDSV, the overflow wave generated in one cycle of spool motion can cancel two cycles of flow ripple. An adaptive-optimum control method based on the rotate-vector optimization method (RVOM) is adopted to adjust the control parameters in order to minimize the amplitude of the pressure pulsation. The biggest advantage of the proposed ACFPP is that it can eliminate the pressure pulsation when PDDSV only works at half of the pressure pulsation's frequency. The simulation and experimentation both verify the proposed ACFPP. By the proposed ACFPP, the suppression for the single-frequency component and dual-frequency components of the pressure pulsation have been both realized.

scholarly journals Design and Numerical Simulation-Based Optimization of a Novel Flat-Face Coupling System for Hydraulic Power Equipment

2021 ◽  
Vol 11 (1) ◽  
pp. 388
Author(s):  
Yu-Ting Wu ◽  
Zhen Qin ◽  
Amre Eizad ◽  
Sung-Ki Lyu
Keyword(s):  
Power Transmission ◽  
Fluid Pressure ◽  
Vital Role ◽  
The Novel ◽  
Hydraulic Power ◽  
Working Pressure ◽  
Operational Mechanism ◽  
Transmission Equipment ◽  
Coupling System ◽  
Hydraulic Equipment

Coupling systems play a vital role in hydraulic power transmission equipment. In recent years, flat-face coupling systems have been extensively studied due to their environment friendly features. The difficulty of the connection process of hydraulic equipment increases with the increase in their working pressure. To improve the convenience of making high-pressure connections, a novel flat-face coupling system is proposed in this article. In the proposed design, which is based on the conventional flat-face coupling system, the resistance caused by high hydraulic fluid pressure during coupling is drastically reduced by the addition of an instantaneous pressure relief module. In this study, the theoretical model of the system kinetics is established to illustrate the operational mechanism of the novel design, and a series of computational fluid dynamics numerical investigations based on the novel dynamic mesh technology and Ansys Mosaic meshing technology are implemented to verify the rationality of the proposed design. Additionally, an optimal design of the novel flat-face coupling system is proposed to reduce the energy loss during hydraulic power transmission.

EFFECTS OF TIP MASS ON STABILITY OF ROTATING CANTILEVER PIPE CONVEYING FLUID WITH CRACK

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2609-2614 ◽  
Author(s):  
IN SOO SON ◽  
HAN IK YOON ◽  
SANG PIL LEE ◽  
DONG JIN KIM
Keyword(s):  
Angular Velocity ◽  
Equations Of Motion ◽  
Pipe Conveying Fluid ◽  
Mass Ratio ◽  
Critical Flow Velocity ◽  
Pipe System ◽  
Stability Maps ◽  
The Stability ◽  
Tip Mass ◽  
Conveying Fluid

In this paper, the dynamic stability of a rotating cantilever pipe conveying fluid with a crack and tip mass is investigated by numerical method. That is, the effects of the rotating the rotating angular velocity, the mass ratio, the crack and tip mass on the critical flow velocity for flutter instability of system are studied. The equations of motion of rotating pipe are derived by using the extended Hamilton's principle. The crack section of pipe is represented by a local flexibility matrix connecting two undamaged pipe segments. The crack is assumed to be in the first mode of fracture and always opened during the vibrations. Finally, the stability maps of the cracked rotating pipe system as a rotating angular velocity and mass ratio β are presented.

Pressure Pulsation Analysis of Aircraft Hydraulic Power Pipelines System

2010 ◽  
Vol 97-101 ◽  
pp. 2861-2864 ◽  
Author(s):  
Wei Liu ◽  
Tao Wei ◽  
Zhu Feng Yue
Keyword(s):  
Hydraulic System ◽  
Pressure Pulsation ◽  
Excitation Frequency ◽  
Pipeline System ◽  
Transient Pressure ◽  
Hydraulic Power ◽  
Network Chain ◽  
Output Pressure ◽  
Fluid Network ◽  
Pulsation Model

The output pressure pulsation model for the aircraft hydraulic power pipelines was established by the methods of transfer function and fluid network chain-rules; the dissipation caused by frequency-dependent friction was taken into account. Dynamic characteristics of hydraulic system were discussed in frequency-domain and time-domain respectively, the pumping excitation frequency influenced the frequency-response of hydraulic pipeline system, and several resonance frequency bands were obtained. The inverse fast Fourier transform was applied to simulate the transient pressure pulsation waves under pump starting and steady-running state.

scholarly journals Integral transform solutions of dynamic response of a clamped–clamped pipe conveying fluid

2013 ◽  
Vol 254 ◽  
pp. 237-245 ◽  
Author(s):  
Jijun Gu ◽  
Chen An ◽  
Menglan Duan ◽  
Carlos Levi ◽  
Jian Su
Keyword(s):  
Dynamic Response ◽  
Integral Transform ◽  
Pipe Conveying Fluid ◽  
Conveying Fluid
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