Displacement control of a mobile crane using a digital hydraulic power management system

Heikkilä, Mikko; Linjama, Matti

doi:10.1016/j.mechatronics.2013.03.009

Cited by 57 publications

(27 citation statements)

References 2 publications

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“…The DHPMS has three key advantages over the DHT. Firstly, it is sig- Figure 1-10: Digital Hydraulic Power Management System (modified from [28] nificantly more compact as the ratio of flow to total volume is much better for a pump than for a cylinder. Secondly, the DHPMS can be achieved using offthe-shelf components [14].…”

Section: Hydraulic Transformersmentioning

confidence: 99%

“…Further research into the DHPMS found that when connected directly to a double acting cylinder on an excavator arm a position accuracy of 2mm was achievable regardless of the load on the arm, though this became more difficult at low velocities. It was also suggested that the efficiency could be further improved by using leak-free control valves and by increasing the number of pistons in the unit, whilst reducing the volume of each cylinder and by adding accumulators for energy recovery [28]. Currently no valves exist that are able to meet the optimal requirements of the DHPMS.…”

Section: Hydraulic Transformersmentioning

confidence: 99%

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Control of a fast switching valve for digital hydraulics

Sell¹

2013

Linköping Electronic Conference Proceedings

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Section: Hydraulic Transformersmentioning

confidence: 99%

Section: Hydraulic Transformersmentioning

confidence: 99%

Control of a fast switching valve for digital hydraulics

Sell¹

2013

Linköping Electronic Conference Proceedings

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“…hydro-static transmission systems, direct cylinder motion control (Heikkila, 2016) and energy-storage systems in hybrid vehicles (Taylor et al, 2015). For lowspeed applications of DDMs, such as hydraulic winches (Nordaas et al, 2017), the valves do not require to be as fast and commercial valves meeting the requirements do exist.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics and Sizing of Annular Seat Valves for Digital Displacement Machines

Nørgård¹,

Bech²,

Andersen³

et al. 2018

MIC

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This paper investigates the steady-state flow characteristics and power losses of annular seat valves for digital displacement machines. Annular seat valves are promising candidates for active check-valves used in digital displacement fluid power machinery which excels in efficiency in a broad operating range. To achieve high machine efficiency, the valve flow losses and the required electrical power needed for valve switching should be low. The annular valve plunger geometry, of a valve prototype developed for digital displacement machines, is parametrized by three parameters: stroke length, seat radius and seat width. The steady-state flow characteristics are analyzed using static axi-symmetric computational fluid dynamics. The pressure drops and flow forces are mapped in the valve design space for several different flow rates. The simulated results are compared against measurements using a valve prototype. Using the simulated maps to estimate the flow power losses and a simple generic model to estimate the electric power losses, both during digital displacement operation, optimal designs of annular seat valves, with respect to valve power losses, are derived under several different operating conditions.

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“…Due to its capabilities, the hydraulic system has been used in many applications such as power system [4], braking systems [5], manufacturing system [6], flight simulation [7,8], and cranes [9][10][11]. The low input power is converted into a high torque movement that used to control hydraulic applications.…”

Section: Introductionmentioning

confidence: 99%

An Electro-Hydraulic Servo with Intelligent Control Strategy

Mohammed

Soon

Ghazali

et al. 2018

MATEC Web of Conferences

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Abstract. Versatile engineering applications have been developed to assist, reduce, and avoid human being from any heavy or harmful manufacturing processes. The gradually increased demand in force and position controls have simultaneously increased the usage of Electro-Hydraulic Servo (EHS) system. However, the time varying characteristics such as high-speed, outburst starting and stopping dynamic have led the EHS system to suffer from uncertainties and nonlinearities effects. Therefore, in order to enhance the performance of an EHS to surmount the uncertain and nonlinear effects, a hybrid Fuzzy-PID control strategy is developed which particularly improve the accuracy of the system by enhancing the control performance during the positioning tracking. By measuring the performance of the proposed control approach, the transient response and steady-state analysis will be performed which taking linear and intelligent control strategies as the references in the assessment process. The finding indicates the capability of a hybrid Fuzzy-PID controller in reducing the control effort applied to the EHS system.

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Displacement control of a mobile crane using a digital hydraulic power management system

Cited by 57 publications

References 2 publications

Control of a fast switching valve for digital hydraulics

Control of a fast switching valve for digital hydraulics

Flow Characteristics and Sizing of Annular Seat Valves for Digital Displacement Machines

An Electro-Hydraulic Servo with Intelligent Control Strategy

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