scholarly journals Energy Saving Strategy of the Variable-Speed Variable-Displacement Pump Unit Based on Neural Network

Procedia CIRP ◽  
2019 ◽  
Vol 80 ◽  
pp. 84-88 ◽  
Author(s):  
Rui Jin ◽  
Haihong Huang ◽  
Lei Li ◽  
Libin Zhu ◽  
Zhifeng Liu
Keyword(s):  
Neural Network ◽  
Energy Saving ◽  
Variable Speed ◽  
Pump Unit ◽  
Displacement Pump ◽  
Variable Displacement

Improving the Energy Efficiency of a Hydraulic Press Via Variable-Speed Variable-Displacement Pump Unit

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Haihong Huang ◽  
Rui Jin ◽  
Lei Li ◽  
Zhifeng Liu
Keyword(s):  
Energy Efficiency ◽  
Hydraulic Press ◽  
Variable Speed ◽  
Pump Unit ◽  
Forming Process ◽  
Drive Unit ◽  
Rotating Speed ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Load Conditions

Hydraulic presses are widely applied in various forming processes to manufacture products with complex shapes, however, they are energy-intensive. In order to lower the energy consumption, a variable-speed variable-displacement pump unit (SVVDP) was developed for hydraulic presses, where the flow rate required by the press in a forming process can be realized by changing the motor rotating speed and the pump displacement simultaneously. A theoretical model was built to reveal the energy dissipation behavior of the drive unit, which shows that the energy efficiency of the drive unit can be optimized by varying the rotating speed of the motor under a variety of load conditions. An experimental platform with a SVVDP was established to find the optimum rotating speed and the corresponding displacement in different load conditions, and experimental results verified the improved energy efficiency of the SVVDP compared with that of the commonly used single variable drive unit. By employing the strategy that the determined optimum rotating speeds in different load conditions were preset as recommended values for the drive unit working in different operations, the proposed drive unit was applied to a press completing a forming process and the results indicate significant energy saving potentials.

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

2020 ◽  
pp. 095965182097389
Author(s):  
Samir Kumar Hati ◽  
Nimai Pada Mandal ◽  
Dipankar Sanyal
Keyword(s):  
Energy Saving ◽  
Absolute Error ◽  
Fast Response ◽  
Maximum Energy ◽  
Radial Clearance ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Axial Piston

Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

scholarly journals Model-Following Controller Based on Neural Network for Variable Displacement Pump.

2003 ◽  
Vol 46 (1) ◽  
pp. 176-187 ◽  
Author(s):  
Ming-Hui CHU ◽  
Yuan KANG ◽  
Yih-Fong CHANG ◽  
Yuan-Liang LIU ◽  
Chuan-Wei CHANG
Keyword(s):  
Neural Network ◽  
Model Following ◽  
Displacement Pump ◽  
Variable Displacement

A Coupled Fluid-Structure Simulation for Variable Displacement Pump Used in Vehicle

2012 ◽  
Vol 249-250 ◽  
pp. 361-365
Author(s):  
Wei Wei Wu ◽  
Jin Guo Li ◽  
He He Zheng ◽  
Zhao Sheng Wu
Keyword(s):  
Energy Saving ◽  
Coupled Analysis ◽  
Fluid Structure ◽  
Ale Method ◽  
Structure Simulation ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Constant Displacement ◽  
Computing Grid ◽  
Moving Fluid

The defects of constant displacement pumps hinder the modern vehicle to achieve its energy saving goals. Variable displacement pump is becoming the focus of research and development. In the paper, the displacement adjusting mechanism in the pump is treated as a rigid, and its motion leads to a continuously deforming and moving fluid domain. ALE method is used in CFD to overcome the difficulties of the fluid-structure interaction exists in the variable displacement pump. The moving regularity of computing grid and the boundary conditions of the ALE method are reasonably specified, to minimize the computing complexity in the coupled analysis. Experiments on prototype prove the performance of the pump in flow rate and energy saving. The results of analysis agree well with the experimental data, and the motion of the displacement adjusting mechanism is analyzed accurately.

Experimental Research of Operation Performance of the Capillary Radiant Air-Conditioning Terminal Integrated with DC Variable Speed New Air Unit

2011 ◽  
Vol 374-377 ◽  
pp. 547-552
Author(s):  
Jian Bo Chen ◽  
Fei Cheng ◽  
Fen Li
Keyword(s):  
Energy Saving ◽  
Experimental Research ◽  
Air Conditioning ◽  
Storage Capacity ◽  
Heat Storage ◽  
Operation Mode ◽  
Water System ◽  
Variable Speed ◽  
Operation Performance ◽  
Cooling Ability

By means of experiment, the author analyzed the operation performance of the capillary radiant air-conditioning terminal integrated with DC variable speed new air unit. The results show that the operation mode that the capillary radiant air-conditioning terminal running combined with DC variable speed new air unit not only avoid the disadvantages of the capillary radiant air-conditioning such as temperature dropping slowly, condensation of moisture under hot and humid conditions during the cooling season, but also effectively overcome the problem that the cooling ability of the radiation surface is low caused by avoiding condensation, and the system can also take the moisture load indoor away as well as achieve the purpose of dehumidification. Besides, using the heat storage capacity of the capillary radiant air-conditioning terminal, controlling water- system of capillary radiant air-conditioning terminal to open and close appropriately can achieve the goal of energy saving.

Active control of surge in centrifugal compressors using a brain emotional learning-based intelligent controller

2015 ◽  
Vol 230 (16) ◽  
pp. 2828-2839 ◽  
Author(s):  
Ali Jokar ◽  
Roozbeh Zomorodian ◽  
Mohammad Bagher Ghofrani ◽  
Pooya Khodaparast
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
High Fidelity Simulation ◽  
Variable Speed ◽  
Load Line ◽  
Neuro Fuzzy ◽  
Performance Map ◽  
Compressor Performance ◽  
Artificial Neural ◽  
Brain Emotional Learning

Efforts have been targeted at providing a comprehensive simulation of a centrifugal compressor undergoing surge. In the simulation process, an artificial neural network was utilized to produce an all-inclusive performance map encompassing those speeds not available in the provided curves. Two positive scenarios for the shaft speed, constant, and variable, were undertaken, and effects of load line on the dynamic response of the compressor have been studied. In order to achieve high-fidelity simulation in the variable speed case, an artificial neural network was utilized to produce an all-inclusive performance map encompassing those speeds not available in the provided curves. Moreover, effects of dynamic characteristics of throttle valve were also investigated. A novel controlling scheme, based on neuro-fuzzy control philosophy, was implemented to stabilize the compressor performance in the unstable region. Results indicate that if applied, this scheme could produce practical and satisfactory outcomes, possessing certain virtues compared to available techniques.

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