Nauka Przyroda Technologie

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Roman Wojtkowiak, Barbara Piszcz, Krzysztof Zembrowski
Mechanical vibrations emitted by Husqvarna 357XP power saw with resonance exhaust system
Summary.

The paper presents a concept, known for many years and commonly applied in the automotive industry, to improve engine performance of the chain saw (higher maximum power rating and more advantageous torque parameters). The analyses were conducted on a Husqvarna 357XP power saw, equipped with a modified resonance exhaust system with variable dimensions. The system was designed at the Department of Forest Technology (Poznań University of Life Sciences) to the already existing power unit, with specific timing gear, size, shape and angle of cylinder ducts. The aim of the study was to assess mechanical vibrations, recorded at the handles of a Husqvarna 357XP chain saw, at three operation regimes of its engine. Analyses were conducted on the same chain saw equipped with an original vibration damper and a modified resonance system in its three variants and it may be stated that the introduction of design changes in the exhaust system has a significant effect on an increase in the power and torque of the tested chain saw. On the basis of recorded results it may be stated that the acceleration of vibrations both on the rear and front handles of the chain saw significantly differs in case of the application of the modified exhaust system in comparison to the original vibration damper. The application of the resonance system in the chain saw exhaust system leads to increased mechanical vibrations produced by the machine. However, it needs to be observed that the volume of the admissible standard is exceeded both for the chainsaw with the original damper and that with the used exhaust system. Vibrations of the chain saw with a resonance damper on the front handle are higher than those of the chain saw with the original damper on average by 28%, while on the rear handle it is by 27%. We need to stress the significantly higher difference when applying in the chain saw modified damper variants 1 and 3 in comparison with the original design.

Key words: power chain saw, resonance exhaust system, vibrations, measurements of vibrations in operation regimes
PDFFull text available in Polish in Adobe Acrobat format:
http://www.npt.up-poznan.net/tom6/zeszyt3/art_61.pdf

For citation:

MLA Wojtkowiak, Roman, et al. "Drgania mechaniczne emitowane przez pilarkę spalinową Husqvarna 357xp z rezonansowym układem wydechowym." Nauka Przyr. Technol. 6.3 (2012): #61.
APA Roman Wojtkowiak1, Barbara Piszcz2, Krzysztof Zembrowski3 (2012). Drgania mechaniczne emitowane przez pilarkę spalinową Husqvarna 357xp z rezonansowym układem wydechowym. Nauka Przyr. Technol. 6 (3), #61
ISO 690 WOJTKOWIAK, Roman, PISZCZ, Barbara, ZEMBROWSKI, Krzysztof. Drgania mechaniczne emitowane przez pilarkę spalinową Husqvarna 357xp z rezonansowym układem wydechowym. Nauka Przyr. Technol., 2012, 6.3: #61.
Corresponding address:
Roman Wojtkowiak
Katedra Techniki Leśnej
Uniwersytet Przyrodniczy w Poznaniu
ul. Wojska Polskiego 71 C
60-625 Poznań
Poland
e-mail: rowojtko@up.poznan.pl
Accepted for print: 22.05.2012