SOFTWARE FOR CHECKING HYDRAULIC LIQUIDS ON TEST STAND

This article discusses the work that resulted in the development of two battery-powered self-propelled electric mining machines intended for operation in the conditions of a Polish copper ore mine. Currently, the global mining industry is seeing a growing interest in battery-powered electric machines, which are replacing solutions powered by internal combustion engines. The cooperation of Mine Master, Łukasiewicz Research Network—Institute of Innovative Technologies EMAG and AGH University of Science and Technology allowed carrying out a number of works that resulted in the production of two completely new machines. In order to develop the requirements and assumptions for the designed battery-powered propulsion systems, underground tests of the existing combustion machines were carried out. Based on the results of these tests, power supply systems and control algorithms were developed and verified in a virtual environment. Next, a laboratory test stand for validating power supply systems and control algorithms was developed and constructed. The tests were aimed at checking all possible situations in which the battery gets discharged as a result of the machine’s ride or operation and when it is charged from the mine’s mains or with energy recovered during braking. Simulations of undesirable situations, such as fluctuations in the supply voltage or charging power limitation, were also carried out at the test stand. Positive test results were obtained. Finally, the power supply systems along with control algorithms were implemented and tested in the produced battery-powered machines during operational trials. The power systems and control algorithms are universal enough to be implemented in two different types of machines. Both machines were specially designed to substitute diesel machines in the conditions of a Polish ore mine. They are the lowest underground battery-powered drilling and bolting rigs with onboard chargers. The machines can also be charged by external fast battery chargers.

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Concept and Realization of a Novel Test Method Using a Dynamic Test Stand for Detecting Persons by Sensor Systems on Autonomous Agricultural Robotics

Sensors ◽

10.3390/s21072315 ◽

2021 ◽

Vol 21 (7) ◽

pp. 2315

Author(s):

Christian Meltebrink ◽

Tom Ströer ◽

Benjamin Wegmann ◽

Cornelia Weltzien ◽

Arno Ruckelshausen

Keyword(s):

Environmental Conditions ◽

Dynamic Test ◽

Test Methods ◽

Test Stand ◽

Human Detection ◽

Test Method ◽

Sensor Systems ◽

Functional Safety ◽

Agricultural Robots ◽

Agricultural Robotics

As an essential part for the development of autonomous agricultural robotics, the functional safety of autonomous agricultural machines is largely based on the functionality and robustness of non-contact sensor systems for human protection. This article presents a new step in the development of autonomous agricultural machine with a concept and the realization of a novel test method using a dynamic test stand on an agricultural farm in outdoor areas. With this test method, commercially available sensor systems are tested in a long-term test around the clock for 365 days a year and 24 h a day on a dynamic test stand in continuous outdoor use. A test over a longer period of time is needed to test as much as possible all occurring environmental conditions. This test is determined by the naturally occurring environmental conditions. This fact corresponds to the reality of unpredictable/determinable environmental conditions in the field and makes the test method and test stand so unique. The focus of the developed test methods is on creating own real environment detection areas (REDAs) for each sensor system, which can be used to compare and evaluate the autonomous human detection of the sensor systems for the functional safety of autonomous agricultural robots with a humanoid test target. Sensor manufacturers from industry and the automotive sector provide their sensor systems to have their sensors tested in cooperation with the TÜV.

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Design and Commissioning of a Modular Multi-Stage Two-Evaporator Transcritical CO2 Test Stand

International Journal of Refrigeration ◽

10.1016/j.ijrefrig.2021.05.033 ◽

2021 ◽

Author(s):

Riley B. Barta ◽

Davide Ziviani ◽

Eckhard A. Groll

Keyword(s):

Test Stand ◽

Multi Stage

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Design of a Test Stand for Lifetime Assessment of Flat Belts in Power Transmission

Procedia CIRP ◽

10.1016/j.procir.2020.02.187 ◽

2020 ◽

Vol 91 ◽

pp. 356-361

Author(s):

Varun Urundolil Kumaran ◽

Markus Zogg ◽

Lukas Weiss ◽

Konrad Wegener

Keyword(s):

Power Transmission ◽

Test Stand

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DESIGN CONCEPT OF TEST STAND FOR DETERMINING PROPERTIES OF MAGNETORHEOLOGICAL ELASTOMERS

Acta Mechanica et Automatica ◽

10.2478/ama-2013-0022 ◽

2013 ◽

Vol 7 (3) ◽

pp. 131-134 ◽

Cited By ~ 2

Author(s):

Mirosław Bocian ◽

Jerzy Kaleta ◽

Daniel Lewandowski ◽

Michał Przybylski

Keyword(s):

Magnetic Field ◽

Mechanical Properties ◽

Smart Materials ◽

Vibration Damping ◽

Test Stand ◽

Design Concept ◽

Special Test ◽

Magnetorheological Elastomers ◽

Vibration Dampers

Abstract Magnetorheological elastomers (MRE) are “SMART” materials that change their mechanical properties under influence of magnetic field. Thanks to that ability it is possible to create adaptive vibration dampers based on the MRE. To test vibration damping abilities of this material special test stand is required. This article presents design concept for such test stand with several options of testing.

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