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1
Content available Numerical investigations on the dynamic behaviour of a 2-DOF airfoil with application in energy harvesting system
Haniszewski Tomasz, Gąska Damian, Margielewicz Jerzy, Opasiak Tadeusz
Zeszyty Naukowe. Transport / Politechnika Śląska
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2023
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z. 118
77--91
EN
This article presents the basic airfoil model with two degrees of freedom - the semi-rigid model, where its forced vibrations were considered, and the exciting force is the aerodynamic force, including its periodic changes, that is, gusts. Since the phenomenological model under study has a coupled form, its versions after decoupling are presented, which has an impact on the results of the final research. The airfoil model presented in this way was shown from the application side in the system of a simple energy harvester based on a deformable beam with piezoelectric elements. The result of the simulation tests is a preliminary analysis of the possibility of using the airfoil as a vibration generator for the energy harvesting system. Along with the application of the mechanical part, a numerical simulation of the electrical part was also implemented, related to the transformation of the voltage generated by piezoelectric elements into a constant voltage signal with a connected receiver with power consumption similar to the Atmega microcontroller with battery charging.
2
Content available Rollers for belt conveyors in terms of rotation resistance and energy efficiency
Opasiak Tadeusz, Margielewicz Jerzy, Gąska Damian, Haniszewski Tomasz
Transport Problems
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2022
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T. 17, z. 2
57--68
EN
The paper shows the results of researching the rollers used in belt conveyors working in a hard coal mine. Rollers should be characterized by low rotation resistance, which results in low power consumption of the propulsion unit. The tests conducted aimed to assess the technical condition of the new C-type rollers after several years of operation in a hard coal mine. The research was carried out from the new approach to the standard issues of roll testing and verification in a hard coal mine. Laboratory tests were combined with testing the entire belt conveyor in terms of power demand. The research was carried out for 3 years and it was monitored how the dynamic resistance of the working rollers changed and how this translates into the power demand consumed by the belt conveyor in a hard coal mine. The aim of the research was a new approach to the research of rollers used in conveyors operating in a mine.
3
Content available New crane bumper design with an energy absorption device system
Haniszewski Tomasz, Margielewicz Jerzy, Gąska Damian, Opasiak Tadeusz
Transport Problems
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2022
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T. 17, z. 3
5--16
EN
This article presents research carried out using physical data from the experimental construction of an overhead crane. This article aims to determine the dynamic behaviour of the cart-pendulum system when the hoisting mechanism hits the new bumper design at the end of the girder support structure with selected speed and bumper material to the length of the wire rope. This research shows the influence of the horizontal speed of the hoisting mechanism on the bumper force during a collision with a standard buffer and its modifications. The presented model can be the basis for modelling more complex cases, and its assumed role (i.e. the ability to determine the angle of deflection of the rope during an impact) has been confirmed and is possible to use in a specific case of an overhead crane on an industrial scale. Preliminary analysis of the construction of the bumper considered reveals its positive features, aiming, among other goals, to reduce the acceleration and force acting on the crane cart in emergency situations.
4
Content available Influence of changes in the working temperature of flexible couplings on their stiffness characteristics
Opasiak Tadeusz, Margielewicz Jerzy, Gąska Damian, Haniszewski Tomasz
Transport Problems
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2022
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T. 17, z. 4
177--186
EN
This article compares flexible couplings of the spider-type insert, and the tiretype insert. The influences of the volume and hardness of the elastomeric connector on the characteristics of this type of coupling, as well as the course of the change of the stiffness coefficient as a result of changes in the operating temperature, are presented. In drive systems, flexible couplings undergo very frequent changes within a wide range of operating temperatures, which causes a change in the dynamic parameters of the flexible couplings during operation.
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