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Modeling and Exploitation Load Tests of the Suspended Route Slings Caused by Passage of the Locomotive at Various Speed along Mining Excavation

100%

Drozd K. , Nieoczym A.

2022

tom Vol. 16, no 1

266--281

Despite the fact that suspended monorails have been used in the mining industry for over 50 years it is necessary to continue research on the possibilities of increasing the unit mass of the transported load or the speed of people transport. The first step is to establish the exact dynamic load of suspended route’ elements and compare this value with easy to calculation static load. The objective of the research was to determine the influence of speed and direction of travel on maximum load force applied to the sling of the route in mining excavation. The research results indicated that the speed of 2 ms−1 does not significantly influence the load on the sling. Theoretical hypothesis, stating that the estimation of the force value in the sling ought to be performed using projecting on a surface perpendicular to the route was confirmed. It was also proven that in order to characterize the geometry of the sling as well as a precise analysis of its load it is necessary to employ the length and the angle of the chain in relation to the above mentioned surface. Upon employing statistical analysis of the test results, the maximum dynamic effect of the locomotive passing was determined to be 20.1 ± 2.5% of the value of the calculated static load for all slings, projected onto a plane perpendicular to the route. For a single sling, mounted on a test route section inclined at an angle of about 10°, the increase in force due to the passage of the locomotive was up to 21.0% of the static load for this sling.

DYNAMIC CHARACTERISTICS MEASUREMENTS OF A FORCE TRANSDUCER AGAINST SMALL AND SHORT-DURATION IMPACT FORCES

75%

Djamal M. , Watanabe K. , Irisa K. , Prayogi I. A. , Takita A. , Yamaguchi T. , Fujii Y.

nr 1

Dynamics of electromechanical drive of suspended timbertransporting rope system

75%

Dzyuba L. , Baryliak V.

tom nr 19(3)

245--256

Dynamic loads of drive of suspended timbertransporting rope system with an electric motor are investigated. Developed a dynamic model of the electromechanical drive considering the changing of the electric motor’s moment during start-up and the resistance force moment. The changing of the resistance force moment is expressed through the changes in tension force of the pull-bearing rope systems in various manufacturing operations. In determining the moment of inertia of the drive drum is accounted multi-winding of rope. Research on dynamic load of system elements are made with the taking into account the influence of torsional stiffness of system parts and lifting capacity of the suspended timbertransporting rope system.

Dynamic characteristics measurements of a force transducer against small and short-duration impact forces

75%

Djamal M. , Watanabe K. , Irisa K. , Prayogi I. A. , Takita A. , Yamaguchi T. , Fujii Y.

tom Vol. 21, nr 1

59--66

A method for evaluating the dynamic characteristics of force transducers against small and short-duration impact forces is developed. In this method, a small mass collides with a force transducer and the impact force is measured with high accuracy as the inertial force of the mass. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the mass, which is the moving part of the bearing. Small and short-duration impact forces with a maximum impact force of approximately 5 N and minimum half-value width of approximately 1 ms are applied to a force transducer and the impulse responses are evaluated.