Stationary Hydraulic Power - Revision history

Eric: Added some more links under the "Internal Links" section

2020-05-20T13:33:24Z

Added some more links under the "Internal Links" section

← Older revision		Revision as of 13:33, 20 May 2020
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	A switch-mode hydraulic transformer may be an effective way to operate constant-flow ("open-center"-design) tools from a constant-pressure stationary hydraulic power system.		A switch-mode hydraulic transformer may be an effective way to operate constant-flow ("open-center"-design) tools from a constant-pressure stationary hydraulic power system.
	[[Category:Hydraulics]]		[[Category:Hydraulics]]

			=Internal Links=
			*[[Open Source Advanced Power Cube Construction Set]]

			=External Links=
			*

ChuckH: /* Small storage */

2014-12-26T09:47:15Z

Small storage

← Older revision		Revision as of 09:47, 26 December 2014
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	In a small-scale installation, the hydraulic system is often completely idle. When the system is in "standby" (nobody is using hydraulic power at the moment), the lines remain pressurized. If there is no major leakage, the main pump can be turned off and the accumulator will maintain pressure. When a tool is connected and fluid begins to flow, the pump will turn on. A small-storage accumulator can seamlessly provide hydraulic power while the pump starts up. The pump turn-on can be triggered by a pressure drop or by an accumulator-capacity sensor.		In a small-scale installation, the hydraulic system is often completely idle. When the system is in "standby" (nobody is using hydraulic power at the moment), the lines remain pressurized. If there is no major leakage, the main pump can be turned off and the accumulator will maintain pressure. When a tool is connected and fluid begins to flow, the pump will turn on. A small-storage accumulator can seamlessly provide hydraulic power while the pump starts up. The pump turn-on can be triggered by a pressure drop or by an accumulator-capacity sensor.

	For these applications gas-bladder accumulators are at least as suitable as raised weights. The compressed-air/hydraulic [http://~~citeseerx~~.~~ist.psu.edu~~/~~viewdoc~~/~~summary?doi=10.1.1.158~~.30 "open accumulator"] achieves much higher energy density than a gas bladder with a tradeoff in increased complexity.		For these applications gas-bladder accumulators are at least as suitable as raised weights. The compressed-air/hydraulic [http://fluidpowerjournal.com/wp-content/uploads/2012/12/FPJTD09_CC.pdf "open accumulator"] achieves much higher energy density than a gas bladder with a tradeoff in increased complexity.

	=== Pulse absorption ===		=== Pulse absorption ===

ChuckH: /* Small storage */

2014-12-26T09:43:49Z

Small storage

← Older revision		Revision as of 09:43, 26 December 2014
Line 58:		Line 58:
	In a small-scale installation, the hydraulic system is often completely idle. When the system is in "standby" (nobody is using hydraulic power at the moment), the lines remain pressurized. If there is no major leakage, the main pump can be turned off and the accumulator will maintain pressure. When a tool is connected and fluid begins to flow, the pump will turn on. A small-storage accumulator can seamlessly provide hydraulic power while the pump starts up. The pump turn-on can be triggered by a pressure drop or by an accumulator-capacity sensor.		In a small-scale installation, the hydraulic system is often completely idle. When the system is in "standby" (nobody is using hydraulic power at the moment), the lines remain pressurized. If there is no major leakage, the main pump can be turned off and the accumulator will maintain pressure. When a tool is connected and fluid begins to flow, the pump will turn on. A small-storage accumulator can seamlessly provide hydraulic power while the pump starts up. The pump turn-on can be triggered by a pressure drop or by an accumulator-capacity sensor.

	For these applications gas-bladder accumulators are at least as suitable as raised weights. The compressed-air/hydraulic [http://~~showcase~~.~~erc-assoc~~.~~org~~/~~accomplishments~~/~~2011/2011-CCEFP1-R-OpenAccum_KG~~.~~html~~ "open accumulator"] achieves much higher energy density than a gas bladder with a tradeoff in increased complexity.		For these applications gas-bladder accumulators are at least as suitable as raised weights. The compressed-air/hydraulic [http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.158.30 "open accumulator"] achieves much higher energy density than a gas bladder with a tradeoff in increased complexity.

	=== Pulse absorption ===		=== Pulse absorption ===

Zdwiel: /* Constant-Pressure Tools */

2012-07-03T00:26:18Z

Constant-Pressure Tools

← Older revision		Revision as of 00:26, 3 July 2012
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	== Constant-Pressure Tools ==		== Constant-Pressure Tools ==
	For use on a constant-pressure shop supply, a tool's flow path should be ''blocked'' (no flow) when it is not in use. In contrast, on a constant-flow mobile system, a subsystem's flow path is ''open'', through the "power beyond" valve gallery to tank return, when it is not in use. This is a concern for tools which incorporate their own valving; for example, it may be necessary to make a porting change in order to connect a [[CEB ~~\|CEB press~~]] to the constant-pressure shop supply line. On the other hand, a simple actuator which connects to the LifeTrac hydraulic takeoff (and expects to be controlled by the LifeTrac HTO control valve) will operate equally well from an appropriate "shop" control valve connected for constant-pressure supply.		For use on a constant-pressure shop supply, a tool's flow path should be ''blocked'' (no flow) when it is not in use. In contrast, on a constant-flow mobile system, a subsystem's flow path is ''open'', through the "power beyond" valve gallery to tank return, when it is not in use. This is a concern for tools which incorporate their own valving; for example, it may be necessary to make a porting change in order to connect a [[CEB Press]] to the constant-pressure shop supply line. On the other hand, a simple actuator which connects to the LifeTrac hydraulic takeoff (and expects to be controlled by the LifeTrac HTO control valve) will operate equally well from an appropriate "shop" control valve connected for constant-pressure supply.

	== Hydraulic pressure transformation ==		== Hydraulic pressure transformation ==

KhalidH: /* Introduction */

2012-06-17T14:19:25Z

Introduction

← Older revision		Revision as of 14:19, 17 June 2012
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	= Introduction =		= Introduction =
	A stationary hydraulic power installation is similar to a "shop air" compressed air system. Typically a central power unit (pump) provides pressurized hydraulic fluid to a plumbing system, which distributes it to multiple points of access around a machinery installation or a building. In the early 20th century municipal hydraulic power flourished [http://www.subbrit.org.uk/sb-sites/sites/h/hydraulic_power_in_london/index.shtml in London], and dockyards often had substantial stationary hydraulic installations. While this type of installation is relatively uncommon in current practice, it has potential advantages in the [[GVCS]] ecosystem. This page is an exploration of stationary hydraulic power implementation issues.		A stationary hydraulic power installation is similar to a "shop air" compressed air system. Typically a central power unit (pump) provides pressurized hydraulic fluid to a plumbing system, which distributes it to multiple points of access around a machinery installation or a building. In the early 20th century municipal hydraulic power flourished [http://www.subbrit.org.uk/sb-sites/sites/h/hydraulic_power_in_london/index.shtml in London], and dockyards often had substantial stationary hydraulic installations. While this type of installation is relatively uncommon in current practice, it has potential advantages in the [[GVCS]] ecosystem. This page is an exploration of stationary hydraulic power implementation issues.


	[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]		[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]

ChuckH: /* Small storage */

2012-05-20T21:25:16Z

Small storage

← Older revision		Revision as of 21:25, 20 May 2012
Line 59:		Line 59:
	In a small-scale installation, the hydraulic system is often completely idle. When the system is in "standby" (nobody is using hydraulic power at the moment), the lines remain pressurized. If there is no major leakage, the main pump can be turned off and the accumulator will maintain pressure. When a tool is connected and fluid begins to flow, the pump will turn on. A small-storage accumulator can seamlessly provide hydraulic power while the pump starts up. The pump turn-on can be triggered by a pressure drop or by an accumulator-capacity sensor.		In a small-scale installation, the hydraulic system is often completely idle. When the system is in "standby" (nobody is using hydraulic power at the moment), the lines remain pressurized. If there is no major leakage, the main pump can be turned off and the accumulator will maintain pressure. When a tool is connected and fluid begins to flow, the pump will turn on. A small-storage accumulator can seamlessly provide hydraulic power while the pump starts up. The pump turn-on can be triggered by a pressure drop or by an accumulator-capacity sensor.

	For these applications gas-bladder accumulators are at least as suitable as raised weights.		For these applications gas-bladder accumulators are at least as suitable as raised weights. The compressed-air/hydraulic [http://showcase.erc-assoc.org/accomplishments/2011/2011-CCEFP1-R-OpenAccum_KG.html "open accumulator"] achieves much higher energy density than a gas bladder with a tradeoff in increased complexity.

	=== Pulse absorption ===		=== Pulse absorption ===

ChuckH: /* Introduction */

2011-12-30T17:33:49Z

Introduction

← Older revision		Revision as of 17:33, 30 December 2011
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	[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]		[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]
	Benefits		Benefits
			* High peak-to-average-power loads are easily handled
			* Hydraulic energy can be efficiently stored for load leveling
	* The same hydraulic-powered tool with quick-connect hose fittings can be used		* The same hydraulic-powered tool with quick-connect hose fittings can be used
	** in the shop,		** in the shop,

ChuckH: /* Introduction */

2011-12-30T17:30:54Z

Introduction

← Older revision		Revision as of 17:30, 30 December 2011
Line 1:		Line 1:
	= Introduction =		= Introduction =
	A stationary hydraulic power installation is similar to a "shop air" compressed air system. Typically a central power unit (pump) provides pressurized hydraulic fluid to a plumbing system, which distributes it to multiple points of access around a building. In the early 20th century municipal hydraulic power flourished [http://www.subbrit.org.uk/sb-sites/sites/h/hydraulic_power_in_london/index.shtml in London], and dockyards often had substantial stationary hydraulic installations. While this type of installation is relatively uncommon in current practice, it has potential advantages in the [[GVCS]] ecosystem. This page is an exploration of stationary hydraulic power implementation issues.		A stationary hydraulic power installation is similar to a "shop air" compressed air system. Typically a central power unit (pump) provides pressurized hydraulic fluid to a plumbing system, which distributes it to multiple points of access around a machinery installation or a building. In the early 20th century municipal hydraulic power flourished [http://www.subbrit.org.uk/sb-sites/sites/h/hydraulic_power_in_london/index.shtml in London], and dockyards often had substantial stationary hydraulic installations. While this type of installation is relatively uncommon in current practice, it has potential advantages in the [[GVCS]] ecosystem. This page is an exploration of stationary hydraulic power implementation issues.

ChuckH: add PWM diagrams

2011-12-30T17:30:14Z

add PWM diagrams

← Older revision		Revision as of 17:30, 30 December 2011
Line 2:		Line 2:
	A stationary hydraulic power installation is similar to a "shop air" compressed air system. Typically a central power unit (pump) provides pressurized hydraulic fluid to a plumbing system, which distributes it to multiple points of access around a building. In the early 20th century municipal hydraulic power flourished [http://www.subbrit.org.uk/sb-sites/sites/h/hydraulic_power_in_london/index.shtml in London], and dockyards often had substantial stationary hydraulic installations. While this type of installation is relatively uncommon in current practice, it has potential advantages in the [[GVCS]] ecosystem. This page is an exploration of stationary hydraulic power implementation issues.		A stationary hydraulic power installation is similar to a "shop air" compressed air system. Typically a central power unit (pump) provides pressurized hydraulic fluid to a plumbing system, which distributes it to multiple points of access around a building. In the early 20th century municipal hydraulic power flourished [http://www.subbrit.org.uk/sb-sites/sites/h/hydraulic_power_in_london/index.shtml in London], and dockyards often had substantial stationary hydraulic installations. While this type of installation is relatively uncommon in current practice, it has potential advantages in the [[GVCS]] ecosystem. This page is an exploration of stationary hydraulic power implementation issues.


			[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]
	Benefits		Benefits
	* The same hydraulic-powered tool with quick-connect hose fittings can be used		* The same hydraulic-powered tool with quick-connect hose fittings can be used
Line 9:		Line 11:
	* Shop tools benefit from the high power density of hydraulic actuators		* Shop tools benefit from the high power density of hydraulic actuators

			It is also fairly simple and efficient to drive an electrical generator from a hydraulic motor, possibly with a switch-mode hydraulic control for speed regulation. See also [[Steam_Hydraulic_Hybrid_Electrical_Generator \|Steam-Hydraulic Electrical Generator]]
	~~[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]~~It is also fairly simple and efficient to drive an electrical generator from a hydraulic motor, possibly with a switch-mode hydraulic control for speed regulation. See also [[Steam_Hydraulic_Hybrid_Electrical_Generator \|Steam-Hydraulic Electrical Generator]]

	= Design Principles =		= Design Principles =
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	In most multi-circuit hydraulic applications, efficiency is poor because the operational cycle requires the load pressure and load flow to vary widely, but the prime mover/pump can only be optimized for a single pressure/flow operating point. Efficiency is improved with load-adaptive pumps (variable displacement, load sensing circuits). However this technique optimizes dynamically to a single circuit's load and does not scale to many circuits driven by a single pump -- the situation in a constant-pressure stationary hydraulic power distribution system.		In most multi-circuit hydraulic applications, efficiency is poor because the operational cycle requires the load pressure and load flow to vary widely, but the prime mover/pump can only be optimized for a single pressure/flow operating point. Efficiency is improved with load-adaptive pumps (variable displacement, load sensing circuits). However this technique optimizes dynamically to a single circuit's load and does not scale to many circuits driven by a single pump -- the situation in a constant-pressure stationary hydraulic power distribution system.

	[[File:LinyiGuTransformer.png\|thumb\|~~300px~~\|Using two valves, this design dynamically transforms to either higher-pressure/lower-flow ''or'' lower-pressure/higher-flow]]
	[[File:IHTfloatingCup.png\|thumb\|~~300px~~\|Hydraulic transformer "floating cup" design from Innas BV]]		[[File:PWM_flowcontrol.png\|thumb\|240px\|PWM transformer to drive constant-flow load from constant-pressure system]][[File:LinyiGuTransformer.png\|thumb\|240px\|Using two valves, this design dynamically transforms to either higher-pressure/lower-flow ''or'' lower-pressure/higher-flow]]
			[[File:IHTfloatingCup.png\|thumb\|240px\|Hydraulic transformer "floating cup" design from Innas BV]]
	Efficiency and other benefits accrue with the availability of "hydraulic transformers" which convert input hydraulic power at one pressure/flow level to hydraulic output power at a different pressure/flow level; this is most useful when the transformation ratio is dynamically adjustable. Four approaches are:		Efficiency and other benefits accrue with the availability of "hydraulic transformers" which convert input hydraulic power at one pressure/flow level to hydraulic output power at a different pressure/flow level; this is most useful when the transformation ratio is dynamically adjustable. Four approaches are:
	* piston intensifier (fixed transformation ratio): pressure applied to a large-area piston pumps fluid from a small-area piston, typically using a "stepped" piston with two different diameters.		* piston intensifier (fixed transformation ratio): pressure applied to a large-area piston pumps fluid from a small-area piston, typically using a "stepped" piston with two different diameters.

ChuckH: /* Introduction */

2011-12-30T17:24:07Z

Introduction

← Older revision		Revision as of 17:24, 30 December 2011
Line 9:		Line 9:
	* Shop tools benefit from the high power density of hydraulic actuators		* Shop tools benefit from the high power density of hydraulic actuators

	It is also fairly simple and efficient to drive an electrical generator from a hydraulic motor, possibly with a switch-mode hydraulic control for speed regulation. See also [[Steam_Hydraulic_Hybrid_Electrical_Generator \|Steam-Hydraulic Electrical Generator]]
			[[File:PWM_generator.png\|thumb\|Hydraulically driven electrical generator with PWM speed regulation]]It is also fairly simple and efficient to drive an electrical generator from a hydraulic motor, possibly with a switch-mode hydraulic control for speed regulation. See also [[Steam_Hydraulic_Hybrid_Electrical_Generator \|Steam-Hydraulic Electrical Generator]]

	= Design Principles =		= Design Principles =