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Title:Pojav resonance v prosto vrtečih se krožnih žagnih listih
Authors:ID Bučar, Bojan (Author)
ID Merhar, Miran (Author)
Files:.pdf PDF - Presentation file, download (108,01 KB)
MD5: CB168E0BD7775B83B86B7BE59C714314
PID: 20.500.12556/dirros/fb500b12-a498-4396-b584-eb5a8711b121
 
Language:Slovenian
Typology:1.01 - Original Scientific Article
Organization:Logo SciVie - Slovenian Forestry Institute
Abstract:V članku je prikazana analiza aerodinamičnega vzbujanja prosto vrtečega se krožnega žagnega lista. Ko se krožni žagni list prosto vrti, se zrak v pazdušnem prostoru ozobljenega dela orodja pri prehodu rezila loči od njegovihmejnih bočnih površin in tvori spremenljivo valovito brazdo oziroma turbolentni tok zraka. Posledica časovno spremenljivega turbolentnega toka je nastanek spremenljivega tlaka zraka ob površnah rezila, kar predstavlja aerodinamično vzbujanje žagnega lista. Za pojav prečnega resonančnega nihanja orodja ne zadošča zgolj aerodinamično generirana vzbujevalna sila s primerno frekvenco. Poleg omenjenega pogoja morata biti namreč izpolnjena še dodatna pogoja, in sicer morajo biti vzbujevalne tlačne razlike okoliškega zraka primerno velike, dušilne sposobnosti materiala nosilnega telesa žagnega lista pa dovolj majhne. Ugotovili smo, da nikoli nista vzbujena dva ali več lastnih načinov nihanja hkrati in da je prehod iz enega resonančnega stanja v drugega skokovit. Z naraščajočo frekvenco vrtenja se praviloma povečuje tudi območje vrtljajev, v katerem pride do aerodinamične vzbuditve lastnih nihajnih načinov.
Keywords:resonanca, aerodinamično vzbujanje, nihanje krožnih žagnih listov, hrup prosto vrtečih se krožnih žagnih listov, stabilnost krožnih žagnih listov
Publication status:Published
Publication version:Version of Record
Year of publishing:2003
Number of pages:str. 71-85
Numbering:Vol. 70
PID:20.500.12556/DiRROS-7574 New window
UDC:621.934:674
ISSN on article:0351-3114
URN:URN:NBN:SI:doc-JKKQVZVD
COBISS.SI-ID:1087369 New window
Publication date in DiRROS:12.07.2017
Views:4459
Downloads:1913
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Record is a part of a journal

Title:Zbornik gozdarstva in lesarstva. forest and wood science & technology
Shortened title:Zb. gozd. lesar.
Publisher:Gozdarski inštitut Slovenije, Biotehniška fakulteta, Oddelek za gozdarstvo in obnovljive gozdne vire, Biotehniška fakulteta, Oddelek za lesarstvo
ISSN:0351-3114
COBISS.SI-ID:6206978 New window

Secondary language

Language:Slovenian
Title:Resonance in idling circular saw blades
Abstract:The article deals with the analysis of the aerodynamic excitation of a freely rotating circular saw blade. When the circular saw blade rotates freely, the air in the gullet spaces of the rim area of the tool separates (in the passing of the knife from its border flanking surfaces) and forms a variable waveform wake or turbulent airflow. The consequence of the time-variable turbulent airflow is the occurrence of variable air pressure along the knife surfaces, which constitutes the aerodynamic excitation of the saw blade. For the occurrence of transversal resonant vibration of the tool, there does not suffice only aerodynamically generated excitation force at a suitable frequency. In addition to the said condition, two additional conditions must also be met: the exciting pressure differences of the surrounding air must be adequately large, and the damping capabilities of the material of the saw plate sufficiently small. We have found that two or more natural manners of vibration are never excited simultaneously and that the transition from one resonant condition into another is abrupt. With the increasing frequency of rotation there is also, as a rule, an increase in the range of rotations in which the aerodynamic excitation of natural manners of vibration occurs.
Keywords:resonance, aerodynamic excitation, circular saw blade vibrations, circular saw blade idling noise, circular saw blade stability


Collection

This document is a part of these collections:
  1. Acta Silvae et Ligni

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