Active control of pressure pulsation in a switched inertance hydraulic system

2013 ◽  
Vol 227 (7) ◽  
pp. 610-620 ◽  
Author(s):  
Min Pan ◽  
Nigel Johnston ◽  
Andrew Hillis
Keyword(s):  
Active Control ◽  
Hydraulic System ◽  
Pressure Pulsation

The Application Study of Accumulator Used in Hydraulic System of 20MN Fast Forging Machine

2011 ◽  
Vol 80-81 ◽  
pp. 870-874 ◽  
Author(s):  
Min Qiang Dai ◽  
Sheng Dun Zhao ◽  
Xiao Mei Yuan
Keyword(s):  
Energy Conservation ◽  
Hydraulic System ◽  
Pressure Pulsation ◽  
Test System ◽  
Hydraulic Shock ◽  
Application Study ◽  
Calculation Results ◽  
Set Up ◽  
Forging Press ◽  
Made In

Based on the description of 20MN fast forging press hydraulic system, the paper analyzed the possibility of energy conservation which the accumulator made in the fast forging machine system. When accumulator was used in fast forging machine, then analyzed the calculation results, and the energy conservation program of fast forging machine energy accumulator was evaluated briefly. The test system was set up on 20MN fast forging machine, and the paper researched the application of accumulator in fast forging press hydraulic system on absorbing hydraulic shock and eliminating pressure pulsation.

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 Active Pressure Ripple Reduction of a Self-Supplied Variable Displacement Pump with Notch Least Mean Square Filter

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 932
Author(s):  
Xiaochen Huang ◽  
Bing Xu ◽  
Weidi Huang ◽  
Haogong Xu ◽  
Fei Lyu ◽  
...  
Keyword(s):  
Control System ◽  
Active Control ◽  
Pressure Pulsation ◽  
Control Signal ◽  
Control Technique ◽  
Mean Square ◽  
Least Mean Square ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Pressure Ripple

As the power sources in hydraulic systems, variable displacement axial piston pumps generate flow fluctuation. Unfortunately, it results in pressure pulsation which excites the system vibration and emitted noise. The majority of studies try to eliminate the pulsation via a passive technique and the active control methodology has not been discussed in detail. In this research, the feasibility of reducing the pressure ripple by properly controlling the proportional valve has been investigated, which also supports the miniaturization of the active control system. A mathematical model of the self-supplied variable displacement pump including the control system has been developed. The filtered-X least mean square algorithm with time-delay compensation is utilized to calculate the active control signal. Simulation results show the effectiveness of the active control technique. The effect of the active control signal on the flow rate from different chambers of the pump has been analyzed. It demonstrates that the variation of the pressure pulsation should be ascribed to the comprehensive reaction of different flow rates. The major reason is that the flow of the actuator piston neutralizes the peak value of the flow ripple, generated by the nine pistons.

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 MPPT Control of Hydraulic Power Take-Off for Wave Energy Converter on Artificial Breakwater

2020 ◽  
Vol 8 (5) ◽  
pp. 304 ◽  
Author(s):  
Jianan Xu ◽  
Yansong Yang ◽  
Yantao Hu ◽  
Tao Xu ◽  
Yong Zhan
Keyword(s):  
Active Control ◽  
Wave Energy ◽  
Hydraulic System ◽  
Control Algorithm ◽  
Control Flow ◽  
Wave Energy Converter ◽  
Control Algorithms ◽  
Energy Converter ◽  
Point Tracking ◽  
Optimal Damping

Wave energy is a renewable energy source that is green, clean and has huge reserves. In order to develop wave energy resources, an oscillating buoy Wave Energy Converter (WEC) device based on the artificial breakwater is presented in this paper. In order to effectively vent the gas in the hydraulic PTO and to improve the active control capability of the PTO system to guarantee the safety performance of the system under high sea conditions, a hydraulic PTO with an active control circuit is designed. Additionally, for the Power Take-Off (PTO) system, there is a optimal damping point under different sea conditions for PTO system, so the PTO can be controlled by the Maximum-Power-Point-Tracking (MPPT) control algorithms to improve the generated power of the system. At present, the MPPT control algorithms for wave energy are mainly used to control the load of generator. However, a fixed-load storage battery is used for the load of the generator in this paper. Additionally, an MPPT control taken at a hydraulic PTO system is executed to improve the power generated by hydraulic PTO under different sea conditions effectively in this paper. The MPPT control based on the hydraulic system is conducted by controlling the displacement of hydraulic motor to achieve the optimal damping point tracking control. The control flow of the MPPT algorithm is provided. The variable step hill-climbing method is used in MPPT control algorithm in which the big step can reduce the time of tracking and the small step can increase the accuracy of MPPT control algorithm. Due to the slow stability of the hydraulic system, a filter method for hydraulic PTO power is used. In addition, the hydraulic PTO system and MPPT control are verified to be feasible with the simulation. Additionally, MPPT control based on hydraulic variable motor is easier to carry out in practical applications than the traditional control of resistance. Finally, the simulation results demonstrate that it is an effective power control strategy for hydraulic PTO system to improve the generated power.

Active control of hydraulic oil contamination to extend the service life of aviation hydraulic system

2017 ◽  
Vol 96 (5-8) ◽  
pp. 1693-1704 ◽  
Author(s):  
Ren-cai Zhang ◽  
Xiang Yu ◽  
Yun-long Hu ◽  
Hong-jiao Zang ◽  
Wen Shu
Keyword(s):  
Service Life ◽  
Active Control ◽  
Hydraulic System ◽  
Oil Contamination ◽  
Hydraulic Oil

scholarly journals Design and Characteristic Analysis of a New Type of Hydraulic Pulsation Suppressor

2021 ◽  
Vol 293 ◽  
pp. 02028
Author(s):  
Jun Yuan ◽  
Hang Jiang ◽  
Zheng-yan Fang ◽  
Tian-sheng Wang ◽  
Zhi Luo ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydraulic System ◽  
Pressure Pulsation ◽  
Structural Characteristics ◽  
Pulsation Frequency ◽  
Characteristic Analysis ◽  
Expansion Chamber ◽  
Attenuation Effect ◽  
Fluid Theory ◽  
New Type

In order to decrease the pressure pulsation of high-pressure hydraulic system and speed up the process of high-pressure hydraulic system, a new type of hydraulic pulsation suppressor is designed. The hydraulic pulsation suppressor is designed on the basis of the structural characteristics and attenuation performance of the expansion chamber attenuator and H-type muffler. The theoretical model of the modern hydraulic pulsation suppressor is established based on the fluid theory, and the attenuation performance of the new hydraulic pulsation suppressor is analyzed. The results demonstrate that the designed new hydraulic pulsation suppressor can attenuate the pressure pulsation with a pulsation frequency of 20 Hz～2000 Hz, and attenuate the frequency bandwidth; the attenuation effect is above 50dB, and the attenuation effect is ideal.

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