Department of Sustainable Biomaterials

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https://hdl.handle.net/10919/23939
The Department of Sustainable Biomaterials was formerly the Department of Wood Science and Forest Products. The name was changed in 2012.

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Browsing Department of Sustainable Biomaterials by Author "Böröcz, Péter"

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    The Effect of Forklift Type, Pallet Design, Entry Speed, and Top Load on the Horizontal Shock Impacts Exerted during the Interactions between Pallet and Forklift
    Masis, Jorge; Horvath, Laszlo; Böröcz, Péter (MDPI, 2022-07-12)
    Forklift handling of palletized loads produces shock impacts that cause significant damage, affecting the durability and life cycle of pallets and unit loads. Laboratory testing processes using an incline impact tester have been developed to assess the resistance of pallets and unit loads to shock impact damage. A key element of the pallet durability test using the incline impact tester is the intensity of the impact. However, there is a lack of information on the intensity of the shock impacts during forklift handling. The objective of this research was to investigate the effects of forklift type, pallet design, entry speed, and top load on the horizontal shock responses measured during the interactions between pallets and forklifts. Two data loggers, SAVER 3X90 and 3D15, were used to measure the horizontal shock impacts experienced during the same event on both the pallet and the forklift. The results showed that the average peak acceleration of the forklift was 2.98 G; the same event resulted in a 4.4 times greater peak acceleration in the pallet. The average duration of these impacts was 10–12 ms. Pallet design and entry speed had the greatest effect on the response measured for the forklift, while the pallet was most heavily influenced by entry speed and forklift type. The paper mainly focused on measuring the severity of the impacts and did not attempt to correlate the measured impacts to damage experienced by unit loads.
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    Measurement and Analysis of Industrial Forklifts Vibration Levels for Unit Load Testing Purposes
    Huang, Yu Yang; Horvath, Laszlo; Böröcz, Péter (MDPI, 2021-03-24)
    Forklifts are one of the most common types of material handling equipment used in warehouses and distribution centers. Vibration generated by forklifts may have an effect on the performance of unit loads and product damage rates. Historical research projects have focused predominantly on the measurement of vibration for over-the-road transportation. Thus, there is still a lack of understanding of the level of vibration caused by forklifts. The goal of this study was to understand how the vibration that is experienced by unit loads while being transported by forklifts is affected by factors such as speed, road condition, unit load weight, type of forklift, and sensor location. For this study, power spectral density (PSD) measurements were collected using a Lansmont Saver 9X30 data logger. Vibration levels were measured for three different industrial forklifts on two different surface types. The forklifts were driven at two different speeds while carrying two different unit load weights. For all of these conditions, the vibration levels were measured at the forklift carriage, at the back of the fork tine heel, and at the fork tine tips. The results obtained show that the highest vibrational intensity occurred at 3–4 Hz, while the highest overall Grms value observed was 0.145 G2/Hz (between 1–200 Hz). An increase in the forklift speed caused an increase in vibration intensity. In contrast, an increase in the unit load weight carried by the forklift caused a decrease in vibration intensity. Among the three forklifts studied, the gas-powered forklift had the highest vibration intensity, and all forklifts, when driven on asphalt, experienced more vibration.