Research Papers

Investigation of an Energy Efficient Hydraulic Propulsion System for a Railway Machine

[+] Author and Article Information
Damiano Padovani

Maha Fluid Power Research Center,
Purdue University,
1500 Kepner Drive,
Lafayette, IN 47905
e-mail: dpadova@purdue.edu

Monika Ivantysynova

Maha Fluid Power Research Center,
Purdue University,
1500 Kepner Drive,
Lafayette, IN 47905
e-mail: mivantys@purdue.edu

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received August 12, 2014; final manuscript received December 3, 2015; published online January 18, 2016. Assoc. Editor: Gregory Shaver.

J. Dyn. Sys., Meas., Control 138(3), 031009 (Jan 18, 2016) (9 pages) Paper No: DS-14-1330; doi: 10.1115/1.4032223 History: Received August 12, 2014; Revised December 03, 2015

Many railway construction and maintenance machines have large masses and perform repetitive working cycles with frequent stops that require precise positioning. For these reasons, a hydraulic propulsion system is a convenient choice. Common existing solutions make use of valve-controlled hydraulic circuits where inefficient fluid throttling takes place. Most of the time, dissipative braking is realized resulting in a remarkable quantity of available energy being wasted (up to 36 kJ of kinetic energy is available in the reference application). Additionally, the machine's automated positioning is a critical aspect. On some commercialized solutions, an overshoot of the desired final position is commonplace requiring a reverse motion in order to match the location of the desired working point. This is a negative characteristic as it introduces unnecessary fuel consumption and slows down productivity. Moreover, consideration of the limited adhesion in the wheel/rail interface is of critical importance. The propulsion system needs to be capable of differentiating the tractive or the braking torques between the driven axles. To this end, the paper proposes and analyzes a displacement-controlled (DC) propulsion system for a railway maintenance machine. The target is the removal of the fluid throttling mentioned above by defining an efficient hydraulic system. The ability to recover energy via regenerative breaking becomes a key process in improving the global machine efficiency. Simultaneously, an implementable control strategy is required for the proposed architecture to prevent overshoot of the desired position while stopping. To that end, this paper presents the mathematical model of the proposed layout used to simulate the system's behavior in order to confirm proper functioning. This work concludes with a discussion and definition of future improvements.

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Fig. 1

Velocity of the machine during a characteristic working cycle

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Fig. 2

Structure of the machine's mechanical transmissions

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Fig. 3

Schematic of the HSTs

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Fig. 4

Structure of the dynamic model

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Fig. 5

Free-body diagrams of the rolling stocks (above) and of the axles

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Fig. 6

Longitudinal (on the left) and transversal cross sections of the rail/wheel interaction

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Fig. 7

Structure of the proposed controller

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Fig. 8

Variation of the adhesion coefficient versus slip

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Fig. 9

Vehicle's velocity and brake's command during the considered working cycle

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Fig. 10

Displacements of the primary units (VPs)

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Fig. 11

Pressures in the lines of the HSTs

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Fig. 12

Relevant torques of the system

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Fig. 13

CE's speed and CE's command

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Fig. 14

Variation of the slip coefficients

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Fig. 15

Detail of the vehicle's velocity (left) and pressures in the front HST for the system with on/off valves (right)

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Fig. 16

Detail of the FMs' hydraulic torques (left) and of the slip coefficients (right) for the system with on/off valves



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