Stručni rad
https://doi.org/10.31306/s.67.1.5
Determination of the optimal handheld engine mower (trimmer) handles vibration damping weight mass and position
Mihael Lukaček
; Veleučilište u Karlovcu, Karlovac, Hrvatska
Josip Hoster
orcid.org/0000-0002-3944-7219
; Veleučilište u Karlovcu, Karlovac, Hrvatska
*
Aleksandar Sušić
orcid.org/0000-0001-9502-9276
; Fakultet strojarstva i brodogradnje, Zagreb, Hrvatska
* Dopisni autor.
Sažetak
This paper shows determination by measurement of optimal damping weight mass and position for handles vibration minimization of engine line mower (trimmer). Free inertial forces caused by the mower engine operation cause mower main rod vibrations as an elastic body. The rod vibrations cause mower head and handles vibrations. The handles vibrations present a problem for human health with unpleasant side-effects in the nervous system (burning sensation) or permanent nerve damage. The measuring setup consists of engine mower suspended by ropes by the handles and the belt hook attachment points by the rigid surroundings and added rigidly connected masses to the rod. The mower used has handles on a tube shaped as the letter „U“. Weights have been fixed also to the tubes by steel rings. The measurement has been conducted by running the engine at idle, and at 2/3 of full throttle and recording at 60 fps with a camera installed in the iPhone 8plus mobile phone. The recorded motion was then analysed in Kinovea computer application. Kinovea as an output gives kinematics of the chosen point as function of time. Influence of added masses at the mower head and under the handles is visible from comparison of acceleration of handles without the weights and with the weights. This approach gives good guidelines into how much mass and where to attach to maximally dampen the handles vibration as much as possible using a simple test setup and equipment. A field measurement in operation suspended on a human operator was conducted, and the influence of weights subjectively assessed by the Borg scale. Conclusion arising from the measurements is that the best weight mass and position are 0,5 kg under each handle for maximal damping of the handle’s vibrations with acceptable increase in total mass of mower.
Ključne riječi
handheld engine mower, handels vibration, vibration damping weight, Kinovea, elastic beam
Hrčak ID:
329803
URI
Datum izdavanja:
3.4.2025.
Posjeta: 711 *