Tractor Scaling Calculations and CAE Analysis - Revision history

Syk0saje at 08:48, 28 January 2012

2012-01-28T08:48:27Z

← Older revision		Revision as of 08:48, 28 January 2012
Line 23:		Line 23:
	#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.		#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.

	[[Category:~~CAE Analysis]]~~		[[Category: Notes]]
	~~[[Category:CAE~~]]

Syk0saje at 08:48, 28 January 2012

2012-01-28T08:48:14Z

← Older revision		Revision as of 08:48, 28 January 2012
Line 23:		Line 23:
	#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.		#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.

	[[Category:CAE Analysis]][[Category:CAE~~]][[Category:Scaling Calculations~~]]		[[Category:CAE Analysis]]
			[[Category:CAE]]

Marcin: /* Load Tests */

2012-01-20T06:03:19Z

Load Tests

← Older revision		Revision as of 06:03, 20 January 2012
Line 23:		Line 23:
	#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.		#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.

	[[Category:CAE Analysis]]		[[Category:CAE Analysis]][[Category:CAE]][[Category:Scaling Calculations]]

Marcin at 06:02, 20 January 2012

2012-01-20T06:02:51Z

← Older revision		Revision as of 06:02, 20 January 2012
Line 22:		Line 22:
	#Scaling frame 2x to determine weight bearing capacity of tractor with a larger frame. This is used to determine whether the tractor can be weighed down with concrete or other weights, hile being scaled to about 10x16 feet - or the size required for a bulldozer of 20,000 lb minimum weight.		#Scaling frame 2x to determine weight bearing capacity of tractor with a larger frame. This is used to determine whether the tractor can be weighed down with concrete or other weights, hile being scaled to about 10x16 feet - or the size required for a bulldozer of 20,000 lb minimum weight.
	#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.		#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.

			[[Category:CAE Analysis]]

Marcin: /* Load Tests */

2011-12-28T10:15:04Z

Load Tests

← Older revision		Revision as of 10:15, 28 December 2011
Line 16:		Line 16:

	=Load Tests=		=Load Tests=
	#Test for maximum weight bearing capacity of 1-7/8" shaft based on wheel geometry of [[Quick Attach ~~Wheels~~]]		#Test for maximum weight bearing capacity of 1-7/8" shaft based on wheel geometry of [[Quick Attach Wheel]]
	#Test of weight bearing capacity of [[Quick Attach Wheels]] system		#Test of weight bearing capacity of [[Quick Attach Wheels]] system
	#Weight holding capacity of frame assuming point load on 2 upper horizongal long members for a deflection of 1/2" or until bolt failure, whichever is earlier.		#Weight holding capacity of frame assuming point load on 2 upper horizongal long members for a deflection of 1/2" or until bolt failure, whichever is earlier.

Marcin: /* Scaling Calculations */

2011-12-28T09:17:12Z

Scaling Calculations

← Older revision		Revision as of 09:17, 28 December 2011
Line 1:		Line 1:
	=Scaling Calculations=		=Scaling Calculations=

	Scaling calculations are best done with CAE analysis. We can determine the lifetime and weight-bearing strength of the existing design, and we also know that we can build a smaller microtractor. However, to build a larger tractor such as a bulldozer - with at least 20,000 lb weight, we should perform CAE analysis based on the specific geometry in question. This will determine the shaft sizing, coupling, and gear reductions allowable in the system based on a 100 year design lifetime.		Scaling calculations are best done with CAE analysis. We can determine the lifetime and weight-bearing strength of the existing design, and we also know that we can build a smaller microtractor. However, to build a larger tractor such as a bulldozer - with at least 20,000 lb weight, we should perform CAE analysis based on the specific geometry in question. This will determine the shaft sizing, coupling, and gear reductions allowable in the system based on a 100 year design lifetime. From back-of-envelope calculations, 2.5" shafts, dually or trually wheels on the exact same drive system as now, with jackshaft gear reduction, could yield approximately 15,000 pounds of traction power by simply using 16" truck tires with 4 wheel drive. This is based on the 5000lb traction limit of an F250 truck - assuming 4 wheel drive and single tires.

	=Traction=		=Traction=

Marcin at 09:12, 28 December 2011

2011-12-28T09:12:43Z

← Older revision		Revision as of 09:12, 28 December 2011
Line 1:		Line 1:
			=Scaling Calculations=

			Scaling calculations are best done with CAE analysis. We can determine the lifetime and weight-bearing strength of the existing design, and we also know that we can build a smaller microtractor. However, to build a larger tractor such as a bulldozer - with at least 20,000 lb weight, we should perform CAE analysis based on the specific geometry in question. This will determine the shaft sizing, coupling, and gear reductions allowable in the system based on a 100 year design lifetime.

	=Traction=		=Traction=

Marcin: /* Load Tests */

2011-12-28T09:09:33Z

Load Tests

← Older revision		Revision as of 09:09, 28 December 2011
Line 18:		Line 18:
	#Scaling frame 2x to determine weight bearing capacity of tractor with a larger frame. This is used to determine whether the tractor can be weighed down with concrete or other weights, hile being scaled to about 10x16 feet - or the size required for a bulldozer of 20,000 lb minimum weight.		#Scaling frame 2x to determine weight bearing capacity of tractor with a larger frame. This is used to determine whether the tractor can be weighed down with concrete or other weights, hile being scaled to about 10x16 feet - or the size required for a bulldozer of 20,000 lb minimum weight.
	#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.		#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.

	~~#ng tests are critical to a good understanding of tractor lifetime and performance:~~

	~~[[Traction and wheel drive systems]]~~
	~~[[Tractor Power]]~~
	~~[[6Tractor Machine size scaling]]~~

Marcin: /* Load Tests */

2011-12-28T09:08:30Z

Load Tests

← Older revision		Revision as of 09:08, 28 December 2011
Line 16:		Line 16:
	#Weight holding capacity of frame assuming point load on 2 upper horizongal long members for a deflection of 1/2" or until bolt failure, whichever is earlier.		#Weight holding capacity of frame assuming point load on 2 upper horizongal long members for a deflection of 1/2" or until bolt failure, whichever is earlier.
	#Shock absorbing capacity of frame using Grade 2 bolts prior to bolt shearing, and same with Grade 5 and 8 bolts. This is used to determine if Grade 2 bolts are satisfactory for lifetime design.		#Shock absorbing capacity of frame using Grade 2 bolts prior to bolt shearing, and same with Grade 5 and 8 bolts. This is used to determine if Grade 2 bolts are satisfactory for lifetime design.
			#Scaling frame 2x to determine weight bearing capacity of tractor with a larger frame. This is used to determine whether the tractor can be weighed down with concrete or other weights, hile being scaled to about 10x16 feet - or the size required for a bulldozer of 20,000 lb minimum weight.
			#Using 2.5" bearings, determining the maximum weight bearing capacity for a jack-shaft drive system, 4 wheel drive, for a bulldozer - using all-steel wheels like in old steam traction engines from about 100 years ago.

	#ng tests are critical to a good understanding of tractor lifetime and performance:		#ng tests are critical to a good understanding of tractor lifetime and performance:
Line 22:		Line 23:
	[[Traction and wheel drive systems]]		[[Traction and wheel drive systems]]
	[[Tractor Power]]		[[Tractor Power]]
	[[~~Tractor~~ Machine size scaling]]		[[6Tractor Machine size scaling]]

Marcin: /* Traction CAE Analysis */

2011-12-28T09:04:06Z

Traction CAE Analysis

← Older revision		Revision as of 09:04, 28 December 2011
Line 10:		Line 10:
	#Determining the shear limit of a 3/4" grade 8 bolt holding the wheel in place. This would involve 3 points of failure: the shearing of the bolt (simple pin-through with metal lock nut); ripping of the 3/4" bolt hole through the cold-rolled steel shaft; ripping of the reinforced collar holding the wheel. Test for maximum safe torque with a safety factor resulting in 30 years of continuous operation (equivalent to 8 hours per day for 100 years).		#Determining the shear limit of a 3/4" grade 8 bolt holding the wheel in place. This would involve 3 points of failure: the shearing of the bolt (simple pin-through with metal lock nut); ripping of the 3/4" bolt hole through the cold-rolled steel shaft; ripping of the reinforced collar holding the wheel. Test for maximum safe torque with a safety factor resulting in 30 years of continuous operation (equivalent to 8 hours per day for 100 years).
	#Determining the wheel mounting strategy (multiple bolts, key, or spline that would achieve the above lifetime). If practical considerations require replacement as the only lifetime design option, that may be the outcome.		#Determining the wheel mounting strategy (multiple bolts, key, or spline that would achieve the above lifetime). If practical considerations require replacement as the only lifetime design option, that may be the outcome.

			=Load Tests=
	#Test for maximum weight bearing capacity of 1-7/8" shaft based on wheel geometry of [[Quick Attach Wheels]]		#Test for maximum weight bearing capacity of 1-7/8" shaft based on wheel geometry of [[Quick Attach Wheels]]
	#Test of weight bearing capacity of [[Quick Attach Wheels]] system		#Test of weight bearing capacity of [[Quick Attach Wheels]] system