Directional Stability Enhancement of a Dual Path Front Hydrostatic Drive by Wire Off-Road Vehicle

2006 ◽  
Author(s):  
William van Doorn ◽  
John H. Lumkes
Keyword(s):  
Normal Operation ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Road Vehicle ◽  
Drive Wheel ◽  
Alternative Drive ◽  
Vehicle Acceleration ◽  
Stability Enhancement ◽  
Opening Up ◽  
Drive Pump

This paper discusses the inherent instability in a dual path front hydrostatic drive wheel, rear caster wheel off-road vehicle. A physical system model is created to simulate behavior to both normal operation and outside environmental inputs. The model starts with a simplified diesel engine and includes the hydraulic pumps, motors, and associated components. The hydraulic motor output is coupled to the ground using the drive wheel geometry. Disturbances are applied to each drive wheel. The force on each wheel is determined independently and combined to create a net vehicle acceleration, rotation, or both. A model based controller is designed to accurately steer the vehicle during both slow working speeds and high transport speeds. The control algorithm uses steering input, speed input, and yaw rate to control pump displacement for each wheel. The controller adjusts ground drive pump displacements when a disturbance is applied to either wheel to maintain longitudinal stability. The controller will be implemented on a vehicle using electro-hydraulic pump control. Steering and speed inputs have been modified for input to the controller rather than manually changing pump displacement. Additionally, joystick control has been implemented as an alternative drive mode. The joystick determines speed and steering input with a single hand while opening up the operator station for better visibility and manufacturing.

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

Calculation of a closed hydraulic volumetric system

2021 ◽  
pp. 27-30
Author(s):  
Keyword(s):  
Power Plant ◽  
Wind Power ◽  
Hydraulic System ◽  
Working Fluid ◽  
Wind Power Plant ◽  
Hydraulic Systems ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Oil Pump ◽  
Selection Of

An algorithm is proposed for calculating a closed volumetric hydraulic pump-hydraulic motor system using the example of the hydraulic system of a wind power plant, based on the calculation of the hydraulic systems of mobile machines. The main characteristics of the system components, the selection of initial data for the calculation, working fluid and diameters of hydraulic lines are analyzed. Keywords: hydraulic system, energy, fluid, oil, pump, motor, renewable energy source, wind power plant, machine. [email protected]

scholarly journals Application of a Hydraulic Actuator With Solenoid Valves for a Speed Control System

2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Abdullah Al-Buzayd ◽  
Nadhim Faleh ◽  
Munaf Badr
Keyword(s):  
Control System ◽  
Rotational Velocity ◽  
Speed Control ◽  
Hydraulic Actuator ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
System Components ◽  
Speed Control System ◽  
The Right

This paper describes the design and the execution of a speed control system for a rotary hydraulic actuator by using solenoid valves. The design is to control the rotational velocity (or the speed) of a hydraulic motor without using neither a variable hydraulic pump nor a variable hydraulic motor.  With analysis by the simulation using the package, V 4.2p/1.67 of FluidSIM 4 from FESTO. It is possible to predict the output of the rotational velocity (rpm) and next could take the right decision about the correct specifications of the system components to meet the requirements.

Hydraulic Components Contribution to Total Power Losses and Acceleration of an Open Loop System With Long Hose

2004 ◽  
Author(s):  
Michael Westman ◽  
Ove Isaksson
Keyword(s):  
Open Loop ◽  
Total Power ◽  
Hydraulic Systems ◽  
Power Losses ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Pressure Losses ◽  
Forest Logging ◽  
Pipe Line ◽  
Valve Block

This paper is concerned with forest logging machinery. A great deal of final felling in cut-to-length method done by harvester, which fells, delimbs and cuts the trees to pre-selected lengths. Two important criteria of a harvester head are that it has to be energy efficient and it has to be as fast as possible. To minimize losses in hydraulic systems the main demand is to reduce pressure losses in high power valves and outer components as much as possible. Each orifice in the flow path results in power losses. This work is an experimental study on power losses and acceleration of hydraulic motor in a system with long hoses. Main hydraulic components included are hydraulic pump, cartridge valve, pipe line and hydraulic motor. The results show that pre-activating the pump improves the system speed. To reduce losses, optimization of valve block, cartridge valve orifices are needed. Accumulators are favourable if combined with high stand-by pressure.

Design and Implementation of the Integrated Test Platform for the Hydraulic Components

2012 ◽  
Vol 605-607 ◽  
pp. 1340-1344
Author(s):  
Zhi Hai Liu ◽  
Qing Liang Zeng ◽  
Cheng Long Wang ◽  
Hong Xi Kang
Keyword(s):  
Performance Testing ◽  
Flow Diagram ◽  
Test Bed ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Test ◽  
Access Technology ◽  
New Type ◽  
Composition Structure ◽  
Hydraulic Valves

In this paper, a new type of hydraulic test bed is developed which can be used for performance testing of hydraulic valves, hydraulic motor and hydraulic pump. The composition structure diagram of hydraulic system, power supply system, and the signal flow diagram of data acquisition system were designed. The characteristics of the LabWindows/CVI development tools and the usage of Prodave MPI/IE 6 network communication tools were introduced, also the database storage and access technology in LabWindows/CVI environment. It was proved through the practical application that the test bed is reliable and has the merit of higher precision and automation level, and simple operation.

Optimal Construction of a Hydraulic Pump With Elliptic Rotated Piston by Kakeya-Besicovitch Application

2007 ◽  
Author(s):  
Petru Ungur ◽  
Petru A. Pop ◽  
Mircea Gordan ◽  
Nicodim Muresan
Keyword(s):  
Spindle Speed ◽  
Original Position ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Constant Length ◽  
Variable Volume ◽  
Flow Capacity ◽  
Elliptical Section ◽  
Large Flow ◽  
Optimal Construction

The paper has presented an application of Kakeya-Besicovitch, third example about commutation of finite element beam endpoints inside of arbitrary small zone. This area is a hypocycloid with three cusped points at that inner tangent has a constant length independent by the point position of its inner tangent, which being rotated in clock-way it’s came back to its original position with its endpoints reversed. The application is a hydraulic pump compound by one rotated piston with elliptical section which is rolling in a fixed chamber with hypocycloid form and three cusped rounded tips after a curvature equal with major axe ellipse endpoints curvatures. The rolling motion is imposed by eccentric exterior source that acting inside of cylindrical pocket located in the center of elliptic piston, which divided the hypocycloid in three equal parts at 120° from each other. The pump could be working as a hydraulic motor which is endowed with rotating distributor that can feed each chamber with variable volume one by one due to moving the piston. The pump’s relevance is given by its efficiency, allowing a large flow capacity to a lower spindle speed, ensured a constant ratio spindle speed which working silence and a large stability.

A new method of health condition detection for hydraulic pump using enhanced whale optimization-resonance-based sparse signal decomposition and modified hierarchical amplitude-aware permutation entropy

2021 ◽  
pp. 014233122110195
Author(s):  
Fuming Zhou ◽  
Wuqiang Liu ◽  
Xiaoqiang Yang ◽  
Jinxing Shen ◽  
Peiping Gong
Keyword(s):  
Detection Method ◽  
Health Condition ◽  
Signal Decomposition ◽  
Normal Operation ◽  
Permutation Entropy ◽  
Sparse Signal ◽  
Hydraulic Pump ◽  
Whale Optimization ◽  
Hydraulic Equipment ◽  
Sparse Signal Decomposition

The normal operation of the hydraulic pump is the significant premise for the stable and dependable working of hydraulic equipment. Consequently, this research comes up with a health condition detection method of hydraulic pump. First of all, this approach selects resonance-based sparse signal decomposition (RSDD) to adaptively disintegrate vibration signals. The biggest problem of the RSDD algorithm is the requirement to artificially set a large number of key parameters, such as quality factor Q, weight coefficient A, and Lagrange operator u. The improper parameter settings will seriously affect the decomposition performance. To overcome this shortcoming, an enhanced whale optimization algorithm is presented to search the best parameter combination of the RSDD. The algorithm takes the correlation kurtosis as the optimization objective function to adaptively disintegrate the signal into low and high resonance components. Moreover, on the basis of the modified analytic hierarchy process and the amplitude-aware permutation entropy, the modified hierarchical amplitude-aware permutation entropy is raised for measuring the complexity of the measured time series more accurately and comprehensively. After that, a health condition detection method for hydraulic pump based on enhanced whale optimization-resonance-based sparse signal decomposition and modified hierarchical amplitude-aware permutation entropy is raised. Finally, through the usage of the hydraulic pump vibration data, this method is compared with other approaches. According to the experimental results, the raised method can identify the fault type more effectively, which is capable of offering a feasible idea for the health condition detection of hydraulic equipment.

scholarly journals Research on Control Method of the Power System of Stepping-Type Anchoring Equipment

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7123
Author(s):  
Guoyong Su ◽  
Yongcun Guo ◽  
Pengyu Wang ◽  
Gang Cheng ◽  
Dongyang Zhao
Keyword(s):  
Power System ◽  
Permanent Magnet ◽  
Control Method ◽  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Experimental Simulation ◽  
Harmonic Suppression ◽  
Hydraulic Motor ◽  
Hydraulic Pump

To improve the roadway adaptability and control accuracy of anchoring equipment, a stepping anchoring device was designed. A permanent-magnet synchronous motor control and a harmonic suppression algorithm were integrated to optimize the dynamic control system of stepping-type anchoring equipment. The results of an experimental simulation and analysis showed that when the coefficient of coal rock hardness f = 5, 6, and 7, the pulsation coefficient of the hydraulic pump outlet pressure, hydraulic motor output speed, and pump-controlled hydraulic cylinder advance speed in the hydraulic circuit of a pump-controlled motor did not exceed 3% after the equipment based on sliding mode control (SMC) entered the steady state, while the maximum pulsation coefficient was only 32.5% of the PI control. Based on the SMC, the harmonic components of the permanent magnet synchronous motor in the power system were suppressed and compensated for. This enhanced the stiffness of the hydraulic system under motor drive. When the rock stiffness factor gradually changed from f = 5 to f = 8 and increased suddenly from f = 5 to f = 6, the pressure overshoot at the outlet of the hydraulic pump of the pump-controlled motor system was reduced from 11.19% to 7.97% and from 61.19% to 52.88%, respectively, compared with that before the optimization. It was thereby proven that SMC based on harmonic suppression can effectively reduce the system pulsation caused by the multi-factor coupling of anchoring equipment and provide technical support for the optimal control of the power system of stepping-type anchoring equipment.

scholarly journals Developing a Stand for Evaluating Technical Condition of Volumetric Hydraulic Drives with a Hydraulic Loading Device

2019 ◽  
Vol 29 (4) ◽  
pp. 529-545
Author(s):  
Pavel A. Ionov ◽  
Petr V. Senin ◽  
Sergey V. Pyanzov ◽  
Aleksey V. Stolyarov ◽  
Alexander M. Zemskov
Keyword(s):  
Data Processing ◽  
Data Acquisition ◽  
Technical Condition ◽  
Drive Shaft ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Loading ◽  
Data Acquisition Board ◽  
Loading Device ◽  
Made In

Introduction. The article deals with the development of a device for evaluating technical condition on of volumetric hydraulic drives made in Russia and abroad at repair and service centres. Materials and Methods. The study uses the statements of theoretical mechanics and hydrodynamics, the basic principles of mechanisms and machines production. For technical condition evaluating of volumetric hydraulic drives, the method of hydraulic loading of hydraulic motor was applied. Reliability of results was confirmed during experimental settings of the hydraulic loading device stand. Results. A stand design with the hydraulic loading device was developed and put into practice for new technical condition evaluating of volumetric hydraulic drives, made in Russia and abroad, at repair and service centres. A property of the stand is the use of the hydraulic loading method when the torque (braking) moment on the shaft of the tested hydraulic rotor is created using a hydraulic machine. The stand consists of data processing and measurement units. The data processing unit is based on a multifunctional data acquisition board connected with a personal computer. The structure of the data measurement unit includes a frequency converter connected to an electric motor, a drive shaft for connecting the shaft of the tested hydraulic pump; hydraulic system having a hydraulic tank; suction, control, drain, and discharge lines and reversible flow chokes installed in discharge lines and connected with the hydraulic pump and hydraulic rotor; loading device with the reversible hydraulic pump, drive shaft joined with the shaft of the tested hydraulic motor. Additionally, reversible throttle flow meters are connected via special ports and electric lines to the data acquisition board. The developed stand allows evaluating the technical condition of most widespread models of volumetric hydraulic drives used in modern agricultural and road construction equipment. The stand is characterized by good energy efficiency, simplicity of design, low costs, good technical characteristics that make it competitive. Discussion and Conclusion. The new stand design with the hydraulic loading device allows implementating of the dynamic testing methodology and guarantees high accuracy of evaluating the technical condition of the most widespread Russian and foreign volumetric hydraulic drives at repair and service centres. Further improvement of the evaluating the technical condition of volumetric hydraulic drives is related to the development of specialized software for processing and analysing test results in real-time.

Intermittently Operated Oil Hydraulic Pump Unit With Accumulator to Save Energy and Hydraulic Assist for Restart

2013 ◽  
Author(s):  
Katsumasa Suzuki ◽  
Shinpei Ota ◽  
Shuji Kasuya ◽  
Ken Sugimura
Keyword(s):  
Energy Saving ◽  
Electric Power ◽  
Electric Motor ◽  
Combustion Engine ◽  
Electricity Consumption ◽  
Duty Ratio ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Pump Unit ◽  
Pump Inlet

Efforts to conserve energy have been made in a number of fields due to a shortage of energy resources, such as oil, and the need to protect the Earth’s environment. In the field of hydraulics, energy-saving pump units are very important because they consume less energy. At present, variable displacement type hydraulic pump units (VD pump units) and inverter control type pump units (INV pump units) are widely used. The authors propose using an intermittently operated pump unit coupled with an accumulator (ACC pump unit). It is verified that the ACC pump unit is superior to the others in terms of efficiency, especially when the flow rate to the load is small or the duty ratio for the intermittent work is low. However, the stop/restart operation of the electric motor for the pump drive is repeated frequently, and the instantaneous electric power consumed by the electric motor is more than six times the rated electricity when the pump is restarted. Therefore, we decreased the excess electricity consumption at pump restart using a method called “hydraulic assist”. Before the electric motor is turned on, high-pressure fluid is supplied to the pump inlet from the accumulator. The pressure at the pump outlet is made to be zero by opening the valve to the tank. The pump essentially works as a hydraulic motor. Then, the electric motor is turned on. In this method, the instantaneous electric power consumption is reduced. This method is also applied to a hydraulic pump unit driven by an internal combustion engine. The intermittent operation of the engine-driven hydraulic pump unit was accomplished using hydraulic assist to restart the pump. In this report, the energy-saving characteristics are shown.

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