1. Ka hōʻoia ʻana i ke kumu kino o ke kumu kumu
Law of Conservation of Mass
Hoʻokumu ʻia nā ʻōkuhi a pau ma ke ʻano kino o m=ρ×V (ka nui = ka nui × ka nui)
Waiwai mānoanoa
ʻO ka nui o ka alumini maʻemaʻe: 2,698 kg/m³ (20 ℃)
He kūpono ke kumu waiwai o 2,700 kg/m³ no ka helu ʻana i nā ʻoihana (hewa <0.1%).
2. Hōʻoiaʻiʻo i ka Paʻa o nā Huahelu Geometric
2.1. ʻO ke kumu hoʻohālikelike geometric maʻamau
Nā palena o ka hoʻohāhā paipu huinahā:
He ʻoiaʻiʻo kēia i ka wā e like ai ka mānoanoa o ka pā o ka paipu a ʻo ka kihi o loko he kihi ʻākau (ʻo ka pahu huinaha maoli he hoʻololi pōʻai, a ʻo ka hewa theoretical ma kahi o 1-3%).
3. Hōʻoia Kūlike Pūnaehana Unit
ʻO ka hoʻāʻo ʻana i ka helu pilikia
4. Hoʻololi ʻenehana kūpono
4.1. Ka uku no nā kumu kūpono ʻole
4.2. Ka helu o ka hopena hoʻomanawanui
ʻO ka ʻae ʻana i ka mānoanoa ± 10% → Wehe ʻia ke kaumaha ±(8% ~ 12%) (ʻoi aku ka maʻalahi o nā ʻāpana ʻāpana ʻeleʻele)
Hoʻonā: W maoli = W kumukānāwai × (1 + Δt / t) ( Δt : ʻokoʻa mānoanoa)
5. Ho'āʻo Kūlana palena
Hōʻoia hihia koʻikoʻi:
Hōʻikeʻike anomaly Density
7xxx alloy (7075): Ana ʻia ka nui 2.810 g/cm³ → Inā hoʻohana hewa ʻia ka 2.7g/cm³, ʻo ka hapa he +4.1%.
Papa hoʻohua
ʻO 4t(A + B)- 4t² kahi helu ʻenekinia maʻamau i helu ʻia ma ka hoʻonui ʻana i ke anapuni o ka ʻāpana me ka mānoanoa o ka paia a laila e unuhi i nā kihi ʻehā.
Laʻana helu helu:
1.6061 papa alumini(1000 × 500 × 10 mm, lōʻihi 2 m): W = 1000 × 500 × 2 × 0.0027 = 27 kg
2.7075 paipu poepoe(ka anawaena o waho 50 mm, ka manoanoa o ka paia 3 mm, ka loa 1.5 m): W = [(50-3)×3×3.1416×1.5]×0.00283 ≈ 5.65 kg
3. Paipu huinaha(40×40×2mm, lōʻihi 3m): W = [2×2×(40+40-4)×3]×0.0027×0.98 ≈ 2.42 kg
Manaʻo ʻia ke kaʻina hana
1. E koho i ka mānoanoa → 2. E ana i ka nui maoli → 3. E koho i ka helu uku → 4. E helu ma ke kumu
Ka manawa hoʻouna: Iune-17-2025
