Brick Pressing Rate Calculations - Revision history

Marcin: /* The Liberator II - 2018 */

2021-02-05T03:59:14Z

The Liberator II - 2018

← Older revision		Revision as of 03:59, 5 February 2021
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	==One complete cycle volume==		==One complete cycle volume==

			[[File:hptoflow.png]]

	One cycle volume = 395 cu in		One cycle volume = 395 cu in

Marcin: /* The Liberator - 2009 */

2021-02-05T03:55:16Z

The Liberator - 2009

← Older revision		Revision as of 03:55, 5 February 2021
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	==Pressing Rate Results==		==Pressing Rate Results==

	The results above yield 14 brick per minute results.		The results above yield 14 brick per minute results at 25 gpm.

	We need to consider 10% inefficiency in the CEB hydraulic system (-1.4), intermittent operation of the soil grate shaker (-.5), and reduction of the main cylinder speed towards the end of the compression stroke (-1). This slowdown at the end of the compression stroke has been calculated as the condition where the last 1/2" of compression is slowed down by a factor of 4.		We need to consider 10% inefficiency in the CEB hydraulic system (-1.4), intermittent operation of the soil grate shaker (-.5), and reduction of the main cylinder speed towards the end of the compression stroke (-1). This slowdown at the end of the compression stroke has been calculated as the condition where the last 1/2" of compression is slowed down by a factor of 4.

Marcin: /* Introduction */

2019-05-11T20:05:36Z

Introduction

← Older revision		Revision as of 20:05, 11 May 2019
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	[[Image:ceb2016.jpg\|800px]]		[[Image:ceb2016.jpg\|800px]]

	[[CEB Press v16.09]], 2016 machine build. Used during the 2016 [[Seed Eco-Home]] Build. See [[CEB Press Genealogy]].		[[CEB Press v16.09]], 2016 machine build. Machine is shown without hopper for manual loading with soil buckets. Used during the 2016 [[Seed Eco-Home]] Build. See [[CEB Press Genealogy]].

	=The Liberator II - 2018=		=The Liberator II - 2018=

Marcin: /* Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity */

2019-01-30T21:08:00Z

Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity

← Older revision		Revision as of 21:08, 30 January 2019
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	Thus, need to keep main cylinder down for 1.3"		Thus, need to keep main cylinder down for 1.3"

	Main cylinder motion from ~~[[Brick Pressing Calculations]]~~ - 17.7 motions per minute x 8" = 141 inches per minute or 2.4" per second. Need to keep main cylinder down for 1/2 second to allow closure of drawer.		Main cylinder motion from above - 17.7 motions per minute x 8" = 141 inches per minute or 2.4" per second. Need to keep main cylinder down for 1/2 second to allow closure of drawer.

	=The Liberator - 2009=		=The Liberator - 2009=

Marcin: /* Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity */

2019-01-30T21:07:04Z

Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity

← Older revision		Revision as of 21:07, 30 January 2019
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	Thus, need to keep main cylinder down for 1.3"		Thus, need to keep main cylinder down for 1.3"

	Main cylinder motion - 17.7 motions per minute x 8" = 141 inches per minute or 2.4" per second. Need to keep main cylinder down for 1/2 second.		Main cylinder motion from [[Brick Pressing Calculations]] - 17.7 motions per minute x 8" = 141 inches per minute or 2.4" per second. Need to keep main cylinder down for 1/2 second to allow closure of drawer.

	=The Liberator - 2009=		=The Liberator - 2009=

Marcin: /* Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity */

2019-01-30T21:05:52Z

Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity

← Older revision		Revision as of 21:05, 30 January 2019
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	Thus, need to keep main cylinder down for 1.3"		Thus, need to keep main cylinder down for 1.3"

			Main cylinder motion - 17.7 motions per minute x 8" = 141 inches per minute or 2.4" per second. Need to keep main cylinder down for 1/2 second.

	=The Liberator - 2009=		=The Liberator - 2009=

Marcin: /* The Liberator II - 2018 */

2019-01-30T20:54:00Z

The Liberator II - 2018

← Older revision		Revision as of 20:54, 30 January 2019
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	Design consideration: Blockage condition is defined as the condition when machine motion stalls when an impenetrable object, such as a rock, blocks the machine from moving. If one examines the motion cycle - this is possible ONLY during the pressing chamber closure motion after loading soil. The machine can be designed to stall upon a blockage condition, or it can be designed to keep bypassing at a blockage condition. Ideally, the algorithm allows a blockage condition to resolved automatically. If it can't be - there is no real disadvantage of 'design for engine stalling' in the blockage condition - ad a higher GPM pump should be used. Ideally, the control algorithm does not allow dwelling in a blockage condition.		Design consideration: Blockage condition is defined as the condition when machine motion stalls when an impenetrable object, such as a rock, blocks the machine from moving. If one examines the motion cycle - this is possible ONLY during the pressing chamber closure motion after loading soil. The machine can be designed to stall upon a blockage condition, or it can be designed to keep bypassing at a blockage condition. Ideally, the algorithm allows a blockage condition to resolved automatically. If it can't be - there is no real disadvantage of 'design for engine stalling' in the blockage condition - ad a higher GPM pump should be used. Ideally, the control algorithm does not allow dwelling in a blockage condition.

			==Ratio of Main Cylinder Drift Velocity to Drawer Closure Velocity==
			*Main - 2.5" radius squared = 6.25 sq in
			*Secondary - 1.25 raidius squared - rod .625 squared = 1.17 sq in

			Velocity ratio of 6.25/1.17 = 5.3

			Thus, during 7" drawer travel, main cylinder will move up 1.3".

			Thus, need to keep main cylinder down for 1.3"

	=The Liberator - 2009=		=The Liberator - 2009=

Marcin: /* Secondary Cylinder Volume, d=2.5 inches, d_rod=1.25 inches, 14" long */

2019-01-26T23:00:24Z

Secondary Cylinder Volume, d=2.5 inches, d_rod=1.25 inches, 14" long

← Older revision		Revision as of 23:00, 26 January 2019
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	*Rod volume = 17.2 cu in		*Rod volume = 17.2 cu in
	*'''Contraction Volume''': Cylinder volume-rod volume = 51.5 cu in		*'''Contraction Volume''': Cylinder volume-rod volume = 51.5 cu in
	*Drawer cylinder multiplier = contraction to expansion time ratio (used in control code) = 51.5/68.7 = 0.75		*Drawer cylinder multiplier = contraction to expansion time ratio (used in control code) = 51.5/68.7 = '''0.75'''
	*'''Full Cycle Volume''': (expansion volume + contraction volume) = 120 cu in		*'''Full Cycle Volume''': (expansion volume + contraction volume) = 120 cu in

Marcin: /* Secondary Cylinder Volume, d=2.5 inches, d_rod=1.25 inches, 14" long */

2019-01-20T01:28:11Z

Secondary Cylinder Volume, d=2.5 inches, d_rod=1.25 inches, 14" long

← Older revision		Revision as of 01:28, 20 January 2019
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	*Rod volume = 17.2 cu in		*Rod volume = 17.2 cu in
	*'''Contraction Volume''': Cylinder volume-rod volume = 51.5 cu in		*'''Contraction Volume''': Cylinder volume-rod volume = 51.5 cu in
	*~~Contraction~~ to expansion time ratio (used in control code) = 51.5/68.7 = 0.75		*Drawer cylinder multiplier = contraction to expansion time ratio (used in control code) = 51.5/68.7 = 0.75
	*'''Full Cycle Volume''': (expansion volume + contraction volume) = 120 cu in		*'''Full Cycle Volume''': (expansion volume + contraction volume) = 120 cu in

Marcin: /* Secondary Cylinder Volume, d=2.5 inches, d_rod=1.25 inches, 14" long */

2019-01-20T01:18:58Z

Secondary Cylinder Volume, d=2.5 inches, d_rod=1.25 inches, 14" long

← Older revision		Revision as of 01:18, 20 January 2019
Line 27:		Line 27:
	*Rod volume = 17.2 cu in		*Rod volume = 17.2 cu in
	*'''Contraction Volume''': Cylinder volume-rod volume = 51.5 cu in		*'''Contraction Volume''': Cylinder volume-rod volume = 51.5 cu in
			*Contraction to expansion time ratio (used in control code) = 51.5/68.7 = 0.75
	*'''Full Cycle Volume''': (expansion volume + contraction volume) = 120 cu in		*'''Full Cycle Volume''': (expansion volume + contraction volume) = 120 cu in