Abstract:Hydrostatic drive • Bondgraph modeling • High speed low torque (HSLT) • Low speed high torque (LSHT) • Hydro-motor • Loss coefficients • Slip • Torque loss • Efficiency • Rock strength List of symbols D p Volume displacement rate of the pump (m 3 /rad) D pmax Maximum volume displacement rate of the pump (m 3 /rad) D mh,ml Volume displacement rate of the HSLT or LSHT hydro-motor (m 3 /rad) J ld Generalized load inertia of the driving shaft (Kg m 2) J ldh,ldl Load inertia of the HSLT or LSHT driving shaft (kg m … Show more
“…For the more detailed diagram and the working principle of the test set-up, the reader can refer to the article proposed by Vardhan et al. 11 Figure 2.(a) Physical system for the low-torque high-speed (LTHS) drive. (b) Physical system for the high-torque low-speed (HTLS) drive.…”
Section: The Physical Systemmentioning
confidence: 99%
“…The pressure, torque, flow and speed values are obtained through separate sensors and stored and recorded in the PC through the data acquisition (DAQ) system. For the more detailed diagram and the working principle of the test set-up, the reader can refer to the article proposed by Vardhan et al 11…”
Section: The Physical Systemmentioning
confidence: 99%
“…For simulations, the loss coefficients of the pump and hydro-motors depicted by equations (11) through (13), (24) through (26) and (28) and parametric values given in Table 1 have been used. The experiments have been done several times to check the repeatability before recording the data at the sampling rate of 10 ms with the help of data logger.…”
Section: Validation Of the Dynamic Models Of The Hydrostatic Drivesmentioning
Blast hole drill rigs are used for drilling the soft and the medium-hard rocks in open-pit mines. In such rigs, the drill bit is rotated by a hydrostatic drive. In this respect, two different type hydrostatic drives have been considered. In the first drive, the rotation of the drill bit takes place by a variable displacement pump and two low-torque high-speed hydro-motors along with a step-down gear unit (i.e. LTHS drive), whereas in the second drive an identical pump and a high-torque low-speed hydro-motor (i.e. HTLS drive) rotate the drill bit. In this study, the energy saving analysis of the above mentioned hydrostatic drives has been performed with respect to the load profile of the blast hole drilling. In this respect, the modelling, simulation and the experimentation of the drives have been carried out. Simulations have been performed in MATLAB–Simulink environment and it has been verified through experiments. The proportional-integral-derivative control algorithm has been used to control the drives speed in various loading stages. Results show that the high-torque low-speed drive save more energy compares to the low-torque high-speed drive for the usual operating range of the blast hole drilling.
“…For the more detailed diagram and the working principle of the test set-up, the reader can refer to the article proposed by Vardhan et al. 11 Figure 2.(a) Physical system for the low-torque high-speed (LTHS) drive. (b) Physical system for the high-torque low-speed (HTLS) drive.…”
Section: The Physical Systemmentioning
confidence: 99%
“…The pressure, torque, flow and speed values are obtained through separate sensors and stored and recorded in the PC through the data acquisition (DAQ) system. For the more detailed diagram and the working principle of the test set-up, the reader can refer to the article proposed by Vardhan et al 11…”
Section: The Physical Systemmentioning
confidence: 99%
“…For simulations, the loss coefficients of the pump and hydro-motors depicted by equations (11) through (13), (24) through (26) and (28) and parametric values given in Table 1 have been used. The experiments have been done several times to check the repeatability before recording the data at the sampling rate of 10 ms with the help of data logger.…”
Section: Validation Of the Dynamic Models Of The Hydrostatic Drivesmentioning
Blast hole drill rigs are used for drilling the soft and the medium-hard rocks in open-pit mines. In such rigs, the drill bit is rotated by a hydrostatic drive. In this respect, two different type hydrostatic drives have been considered. In the first drive, the rotation of the drill bit takes place by a variable displacement pump and two low-torque high-speed hydro-motors along with a step-down gear unit (i.e. LTHS drive), whereas in the second drive an identical pump and a high-torque low-speed hydro-motor (i.e. HTLS drive) rotate the drill bit. In this study, the energy saving analysis of the above mentioned hydrostatic drives has been performed with respect to the load profile of the blast hole drilling. In this respect, the modelling, simulation and the experimentation of the drives have been carried out. Simulations have been performed in MATLAB–Simulink environment and it has been verified through experiments. The proportional-integral-derivative control algorithm has been used to control the drives speed in various loading stages. Results show that the high-torque low-speed drive save more energy compares to the low-torque high-speed drive for the usual operating range of the blast hole drilling.
“…In addition, they have also checked the experimental validation of the empirical relation in case of actual drilling pertaining to the blasthole drills. Vardhan et al 8 have provided an extensive analysis based on the comparison of the steady-state performance of hydraulic drives linked with a drill machine employed in mining operations. They have devised twin closed-circuit hydraulic drives intended for the drill machine’s rotary head.…”
Section: Introductionmentioning
confidence: 99%
“…Vardhan and Dasgupta 9 have also developed the efficiency map pertaining to the hydraulic drive intended for the drill machine’s rotary head and concluded that the higher efficiency corresponding to the drive is attained near medium to high torque and high speed range. In the above-mentioned studies, 7–9 the dynamic performance of the hydraulic drives for the rotary head of the blasthole drilling machine has not been addressed. In this respect, further study in the drill dynamics of the system is needed.…”
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