Umthamo webhakethi ngumlinganiselo womthamo omkhulu wezinto ezinokuthi zifakwe ngaphakathi kwibhakethi ye-backhoe excavator.Umthamo webhakethi unokulinganiselwa kumthamo we-betki okanye umthamo wemfumba njengoko kuchaziwe ngezantsi:
Umthamo wokubetha uchazwa njengo: Umthamo wevolumu yebhakethi emva kokuba ubethelwe kwinqwelomoya yogwayimbo.Inqwelomoya yokuqhankqalaza idlula kumda ongaphezulu webhakethi kunye nomgca wokusika njengoko kuboniswe kuMzobo 7.1 (a).Lo mthamo we-better unokulinganiswa ngokuthe ngqo kwimodeli ye-3D ye-excavator yebhakethi ye-backhoe.
Kwelinye icala ukubalwa komthamo oyimfumba kwenziwa ngokulandela imigangatho.Ehlabathini jikelele imigangatho emibini esetyenziswayo ukumisela umthamo wemfumba, yile: (i) SAE J296: “I-excavator encinci kunye ne-backhoe bucket volumetric rating”, umgangatho waseMelika (Mehta Gaurav K., 2006), (Komatsu, 2006) (ii) CECE ( IKomiti yeZixhobo zoKwakha zaseYurophu) umgangatho waseYurophu (Mehta Gaurav K., 2006), (Komatsu, 2006).
Umthamo ogciniweyo uchazwa ngolu hlobo: Isixa somthamo obethiweyo kunye nomthamo wezinto ezigqithileyo ezifunjwe kwi-emele kwi-engile ye-1: 1 yokuphumla (ngokwe-SAE) okanye kwi-engile ye-1: 2 yokuphumla (ngokweCECE), njengoko kubonisiwe kumfanekiso 7.1 (b).Oku akuthethi ukuba igaba kufuneka liphathe ibhakethi elijolise kwesi simo sengqondo, okanye yonke into ngokwendalo iya kuba ne-1: 1 okanye i-engile ye-1: 2 ye-repose.
Njengoko kunokubonwa kuMzobo 7.1 umthamo oyimfumba weVh unokunikwa ngolu hlobo:
Vh=Vs+Ve ....(7.1)
Apho, i-Vs ngumthamo wokubethelwa, kwaye i-Ve yi-excess umthamo wezinto eziphathekayo ezifunjwe mhlawumbi kwi-1: 1 okanye kwi-1: i-angle ye-2 yokuphumla njengoko kubonisiwe kwi-Fig. 7.1 (b).
Okokuqala, ukusuka kuMzobo 7.2 wokubetha umthamo weVs equation kuya kuboniswa, emva koko kusetyenziswa iindlela ezimbini ze-SAE kunye ne-CECE, ii-equations ezimbini zomthamo wezinto ezingaphezulu okanye umthamo weVe ziya kuboniswa kuMzobo 7.2.Okokugqibela umthamo webhakethi ufunjwe kwi-equation (7.1).
Umzobo 7.2 Umlinganiselo womthamo webhakethi (a) NgokweSAE (b) NgokweCECE
- Inkcazo yamagama asetyenziswe kumfanekiso 7.2 ngolu hlobo lulandelayo:
- LB: Ukuvulwa kwebhakethi, kulinganiswe ukusuka kungqameko ukuya kutsho ekupheleni kwepleyiti engasemva yebhakethi.
- I-Wc: Ukusika ububanzi, kulinganiswe phezu kwamazinyo okanye abasiki becala (qaphela ukuba imodeli ye-3D yebhakethi ecetywayo kule thesis kuphela ngumsebenzi wokwakha okhanyayo, ngoko ke abasiki becala abaqhotyoshelwanga kwimodeli yethu).
- I-WB: Ububanzi bebhakethi, bulinganiswe ngaphaya kwamacala e-emele kumlebe ongezantsi ngaphandle kwamazinyo abasiki becala aqhotyoshelweyo (ngoko ke oku akuyi kuba yinto ebalulekileyo ye-108 ipharamitha yemodeli ecetywayo ye-3D yebhakethi njengoko ingenayo nayiphi na i-side cutters).
- I-Wf: Ngaphakathi kobubanzi obungaphambili, bulinganiswa kumphetho wokusika okanye abakhuseli abasecaleni.
- Wr: Ngaphakathi ububanzi ngasemva, bulinganiswa kweyona ndawo imxinwa ngasemva kwi-emele.
- I-PArea: Indawo yeprofayili yecala yebhakethi, eboshwe yi-contour yangaphakathi kunye nenqwelomoya yebhakethi.
Umzobo 7.3 ubonisa iiparamitha ezibalulekileyo zokubala umthamo webhakethi wemodeli ecetywayo ye-3D yebhakethi.Ubalo olwenziweyo lusekwe kumgangatho we-SAE njengoko lo mgangatho wamkelekile kwaye usetyenziswa kwihlabathi liphela.