scholarly journals Energy recovery from shock absorbers through a novel compact electro-hydraulic system architecture

Mechatronics ◽  
2022 ◽  
Vol 81 ◽  
pp. 102701
Author(s):  
Marco Miraglia ◽  
Michael Tannous ◽  
Francesco Inglese ◽  
Birgit Brämer ◽  
Mario Milazzo ◽  
...  
Keyword(s):  
System Architecture ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Shock Absorbers

scholarly journals Theoretical background of hydraulic drive control system analysis for testing piston hydraulic cylinders

2019 ◽  
Vol 19 (3) ◽  
pp. 242-249 ◽  
Author(s):  
A. T. Rybak ◽  
I. K. Tsybriy ◽  
S. V. Nosachev ◽  
A. R. Zenin
Keyword(s):  
Mathematical Modeling ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Test Bench ◽  
Hydraulic Drive ◽  
Mechanical Transmission ◽  
Hydraulic Motor ◽  
Hydraulic Machines ◽  
Life Tests ◽  
Hydraulic Cylinders

Introduction. The durability and performance of hydraulic machines is determined through life tests. At that, various braking devices (mechanical, electric, hydraulic, etc.) are used for strength loading of the hydraulic motor, as a result of which a significant amount of energy is lost. This can be avoided if the method of rotational motion with energy recovery is used during life tests. This approach is applicable for hydraulic pumps, motors, and hydraulic cylinders.Materials and Methods. A test bench is presented, the design of which provides recreation of the conditions most appropriate for the field operation of hydraulic cylinders. In this case, energy recovery is possible. To solve the research problems, methods of mathematical modeling were used, the basic functional parameters of the proposed design were calculated. The determination of the pressure increment at various points in the hydraulic system is based on the theory of volumetric rigidity. When modeling the motion of the moving elements of the bench hydraulic system, the laws of rotor motion are used.Research Results. In the structure of the test bench, the cylinders in question are located in the pressure main between the hydraulic pump and the hydraulic motor. This enables to significantly reduce the bench itself and to save a significant amount of energy due to its recovery. A basic hydraulic diagram of the test bench for piston hydraulic cylinders is presented, in which the operation of the moving elements of the system is shown. A mathematical modeling of the hydraulic system of the bench is performed. A kinematic diagram of the mechanism for transmitting motion between test cylinders is shown.Discussion and Conclusions. The system of equations presented in the paper shows how the increment of pressure at the selected nodal points of the energy recovery system is determined (in particular, how the increment depends on time, reduced coefficient of volumetric rigidity, operating fluid consumption, and piston areas). The velocities of the hydraulic pistons are determined according to the kinematic scheme of the mechanical transmission of the bench. Thus it can be argued that, thanks to the solution presented in the paper, the life test results of hydraulic cylinders will adequately reflect their operation under rated duties.

scholarly journals Design and Potential Power Recovery of Two Types of Energy Harvesting Shock Absorbers

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4710 ◽  
Author(s):  
Lincoln Bowen ◽  
Jordi Vinolas ◽  
José Luis Olazagoitia
Keyword(s):  
Mathematical Modeling ◽  
Energy Harvesting ◽  
Energy Recovery ◽  
Ball Screw ◽  
Vehicle Suspension ◽  
Characteristic Curves ◽  
Shock Absorbers ◽  
Recovery Potential ◽  
Power Recovery ◽  
Qualitative Characteristics

Numerous authors have studied Energy Harvesting Shock Absorbers (EHSA) over the last decade, proposing different designs with diverse geometries, parameters, and components. This article analyzes the energy recovery potential of two types of rotational EHSA, those that use ball-screw and those based on cable transmission. This paper presents the design, manufacturing and mathematical modeling of both options as well as the estimation of the potential power recovery with both technologies. Two types of vehicles are used as references, each one with the characteristic curves of their shock absorbers. Results are presented for different vehicle speeds and road types. Finally, some qualitative characteristics of both EHSAs are detailed to be taken into consideration for their possible use in vehicle suspension.

Direct Position Control of Electro-Hydraulic Excavator

2018 ◽  
Author(s):  
Siavash Danaee ◽  
Jarmo Nurmi ◽  
Tatiana Minav ◽  
Jouni Mattila ◽  
Matti Pietola
Keyword(s):  
System Architecture ◽  
Hydraulic System ◽  
Position Control ◽  
Control Point ◽  
Point Of View ◽  
Test Case ◽  
Hydraulic Systems ◽  
Position Measurement ◽  
Physical Sensors ◽  
Accurate Position

Position measurement in the electro-hydraulic systems is feasible via the utilization of physical sensors. An improvement in technology has led to the manufacturing of high accurate position sensors for direct position control. This paper proposes utilization of direct position control in an electro-hydraulic system with a new hydraulic zonal system architecture implemented with Direct Driven Hydraulics. It was mentioned in early study that this hydraulic system architecture as a replacement for the traditional valve-based hydraulic systems, has higher energy efficiency rate. In this study, the simulation implementation and experimental verification of Direct Driven Hydraulics (DDH) will be investigated for a micro excavator test case from position control point of view. Results demonstrated that the implementation of DDH in an excavator case will lead to maximum 5 cm error in a single-cycle movement.

Computational fluid dynamics and experimental analysis of the influence of the energy recovery unit on the proportional relief valve

2017 ◽  
Vol 232 (4) ◽  
pp. 697-705 ◽  
Author(s):  
Tianliang Lin ◽  
Qiang Chen ◽  
Haoling Ren ◽  
Ruoxi Lv ◽  
Chen Miao ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Steady State ◽  
Energy Loss ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Pressure Control ◽  
Steady State Flow ◽  
Relief Valve ◽  
Recovery Unit ◽  
Line Pressure

The overflow energy loss in relief valve, which is one of the main reasons leading to the low efficiency of the hydraulic system, had been considered to be impossible to solve. The principle of the overflow energy loss of the relief valve is analyzed and a novel method to reduce the overflow loss using an energy recovery unit, which can improve the return line pressure of the pilot proportional relief valve, is proposed. The influence of the energy recovery unit on the pressure control characteristics and steady-state flow force of the pilot proportional relief valve are discussed. The effects of the return line pressure on the distribution of the flow field and the pressure control characteristics are analyzed through computational fluid dynamics simulation and experiment. The results show that with the increase of the return line pressure, the displacement of the main valve spool increases and the reset spring force increases accordingly. While the steady-state flow force decreases dramatically with the increase of the return line pressure, which results in a smaller pressure differential the pressure differential can be reduced from 15% to 2.5%. It is also observed that the flow rate of the pilot proportional relief valve can be maintained at a certain value with a small oscillation and that the pilot proportional relief valve can release the redundant flow of hydraulic system. This verifies that the pilot proportional relief valve with the outlet connecting to the energy recovery unit to recovery the overflow energy loss cannot reduce the pressure control characteristics, but can achieve a better pressure control accuracy of the pilot proportional relief valve.

Fatigue Test System for Accumulators

2013 ◽  
Vol 303-306 ◽  
pp. 1272-1275
Author(s):  
Jing Ping Leng ◽  
Jian Jin ◽  
Ke Li Xing
Keyword(s):  
Control System ◽  
Fatigue Test ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Test System ◽  
Test Method ◽  
Hardware System ◽  
Test Requirements ◽  
Upper Computer ◽  
And Control

An energy recovery and high effective fatigue test system for accumulators has been developed through the improvement of test method JB-T 7037-2006 and test requirements JB-T 7036-2006 [1][2]. The test system contains hydraulic system and control system. The hardware system of control system is based on IPC as upper computer and PLC as lower computer, while the software system is based on Borland C++ Builder 6.0, which can realize collecting and saving the field data, drawing and saving testing curve, and generating export.

Design and optimization of a new kind of hydraulic cylinder for mobile robots

2015 ◽  
Vol 229 (18) ◽  
pp. 3459-3472 ◽  
Author(s):  
Yong Xue ◽  
JunHong Yang ◽  
JianZhong Shang ◽  
HuiXiang Xie
Keyword(s):  
Mobile Robots ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Hydraulic Cylinder ◽  
Effective Area ◽  
Well Performance ◽  
Load Pressure ◽  
Design And Optimization ◽  
The One ◽  
The Mathematical Model

In order to improve the efficiency of multi-actuator mobile robots hydraulic system, this paper proposes a new kind of cylinder whose effective area is variable. The new cylinder has multi chambers which can be connected with each other or to a main system circuit by controlling switching valves. On the one hand, the new cylinder can make sure that the load pressure of all actuators is almost equal through varying effective area. On the other hand, the new cylinder can realize the flow recovery through that return chambers are connected with feeding chambers. Therefore, the new cylinder can reduce overall machine energy consumption by reducing throttling losses and allowing energy recovery. The performance of the new cylinder is analyzed through building the mathematical model. Based on the evaluated results, in order to further improve the performance of the load match of the cylinder and avoid the deflection of the main piston, the structure of the cylinder is optimized. Finally, an optimized cylinder is shown in this paper which has well performance of the load match.

Energy Efficient Excavator Hydraulic Systems With Digital Displacement® Pump-Motors and Digital Flow Distribution

2020 ◽  
Author(s):  
Jill Macpherson ◽  
Christopher Williamson ◽  
Matthew Green ◽  
Niall Caldwell
Keyword(s):  
Power Distribution ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Flow Distribution ◽  
Small Scale ◽  
Hydraulic Systems ◽  
System Architectures ◽  
Fuel Savings ◽  
Duty Cycles ◽  
Displacement Pump

Abstract Environmental and economic factors are driving the development of more fuel efficient off-highway vehicles. The pathway to fuel savings of greater than 50% in an excavator application through utilisation of system architectures unlocked by Digital Displacement technology is presented. Pump flow distribution using digital valves instead of traditional proportional control valves is demonstrated experimentally. The “Workbus” power distribution scheme is demonstrated on a small scale backhoe arm on a laboratory test rig. These tests do not include hydraulic energy recovery. A backward-facing simulation of an 18 tonne excavator is described. The simulation uses input data collected from grading and lorry loading duty cycles. Applying the workbus system architecture to the excavator in simulation, fuel savings of 31% to 48% are realized. With the addition of energy recovery capability via Digital Displacement Pump-Motors, simulated fuel savings are 53% to 58% compared to the original excavator hydraulic system.

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