Stump Grinder yog lub tshuab hnyav- lub luag haujlwm tsim los txo cov ceg ntoo thiab cov hauv paus hniav rau hauv cov ntoo. Thaum xav txog ib tug cab -tom qab Stump Grinder - ib qho kev teeb tsa rau arborists thiab toj roob hauv pes - ib qho ntawm cov lus nug tseem ceeb tshaj plaws yog: yuav tsum muaj pes tsawg towing quab yuam kom muaj kev nyab xeeb rub lub Stump Grinder thiab nws cov tsheb thauj mus los ntawm txoj kab nqes, hla hauv av, lossis raws txoj kev paving? Ua kom raug xam qhov yuav tsum tau rub tawm kom ntseeg tau tias lub tsheb thauj khoom (tsheb thauj khoom, tsheb laij teb, lossis SUV) muaj lub zog txaus thiab muaj peev xwm nres, tiv thaiv cov xwm txheej tsis zoo thiab kev siv tshuab. Kab lus no piav qhia txog physics-raws li txoj hauv kev rau kev suav cov quab yuam rau lub pob zeb.
Tag nrho cov towing quab yuam uas yuav tsum tau rub lub Stump Grinder yog qhov sib npaug ntawm ob lub ntsiab lus tseem ceeb: lub gravitational tivthaiv ua rau tib lub sijhawm, thiab dov tsis kam ntawm cov log tsheb trailer thiab hauv av. Lub hauv paus formula yog:
Ftotal =m × g × [sinθ + fr × cosθ]
Qhov twg:
Ftotal= yuav tsum towing force (Newtons, los yog hloov mus rau kgf / lbf)
m= tag nrho qhov hnyav ntawm Stump Grinder ntxiv rau trailer (kg)
g{0}} gravitational acceleration (9.81 m/s²)
θ= txoj kab nqes kaum hauv degrees
fr{0}} coefficient ntawm dov tsis kam (dimensionless)
Txhawm rau siv cov qauv no rau Stump Grinder, koj thawj zaug xav tau qhov hnyav ntub dej ntawm lub tshuab nrog rau tag nrho cov roj tank, roj hydraulic, thiab cov khoom siv txuas ntxiv, ntxiv rau qhov hnyav ntawm lub trailer nws tus kheej. Piv txwv li, ib qho nruab nrab ntawm - lub luag haujlwm cab - tom qab Stump Grinder hnyav li ntawm 1,000-1,500 kg, thiab lub zog tandem - qag trailer ntxiv ntxiv 400-600 kg, muab tag nrho towed hnyav ntawm 1,400-2,100 kg.
Ntawm lub tiaj, pav av (θ=0∘), cov qauv yooj yim rau F=m × g × fr . Siv cov asphalt dov tsis kam coefficient ntawm 0.018 thiab tag nrho qhov hnyav ntawm 1,800 kg, qhov yuav tsum tau rub quab yuam yog li 318 N lossis 32 kgf - yooj yim los ntawm cov tsheb thauj khoom feem ntau. Txawm li cas los xij, tiag tiag -cov xwm txheej hauv ntiaj teb no tsis tshua tiaj tus. Ntawm 5-degree txoj kab nqes (kwv yees li 8.7% qib), cov gravitational feem ua qhov tseem ceeb. Siv tib yam 1,800 kg Stump Grinder thiab trailer ua ke ntawm asphalt:
F=1800 × 9.81 × [sin5∘+0.018 × cos5∘]≈17658 ×[0.087+0.0179]≈1853 N (kwv yees 189 kgf)
Ntawm 10-degree txoj kab nqes nrog gravel nto (fr=0.10), lub zog nce siab:
F=1800 × 9.81 × [sin10∘+0.10 × cos10∘]≈4410 N (kwv yees 449 kgf)
Qhov no tab tom mus txog qhov kev txwv qhov kev txwv ntawm ib nrab ntawm - tuj lub tsheb thauj khoom, tshwj xeeb tshaj yog nyob rau ntawm qhov chaw xoob qhov twg cov log tsheb yuav raug txwv.
Rau kev taug qab tus kheej - cov qauv Stump Grinder, cov kev suav hloov mus rau kev txheeb xyuas seb lub tshuab nws tus kheej tsav tuaj yeem nce qhov nqes hav yam tsis tau swb. Ntawm no cov qauv sib piv muaj kev sib zog sib zog tiv thaiv kom muaj zog:
Favailable =μ × m × g × cosθ
Yuav tsum tau =m × g × [sinθ + ft × cosθ]
Qhov twg μ yog tus khiav -av adhesion coefficient (feem ntau yog 0.4-0.6 rau cov av tawv, 0.25-0.35 rau cov av nplaum ntub dej) thiab ft yog qhov kev sib tw sab hauv dov (0.04-0.07). Stump Grinder tuaj yeem nce qhov nqes hav tsuas yog Favailable Ntau dua lossis sib npaug rau Frequired .
Nyob rau hauv cov ntsiab lus, xam lub towing quab yuam rau ib tug Stump Grinder yuav tsum paub tag nrho cov towed loj, lub steepest xav tias txoj kab nqes, thiab lub dov kuj ntawm lub nto. Siv cov qauv F=m⋅g⋅[sinθ+fr ⋅cosθ] thiab muab faib los ntawm ib qho kev nyab xeeb ntawm 1.3–1.5 los suav rau kev pib inertia thiab kev thauj mus los. Ib txwm muab cov txiaj ntsig sib piv rau koj lub tsheb thauj khoom lub chaw tsim khoom- ntsuas qhov ntsuas qhov rub thiab qhov ntsuas qhov hnyav tag nrho (GCWR) txhawm rau ua kom muaj kev nyab xeeb, ruaj khov ua haujlwm ntawm koj qhov Stump Grinder ntawm txhua qhov chaw ua haujlwm.
