The mechanics of lift routing - Revision history

Editor at 21:11, 28 January 2021

2021-01-28T21:11:10Z

← Older revision		Revision as of 21:11, 28 January 2021
Line 62:		Line 62:
	* Top factors to consider when planning to install a lift.		* Top factors to consider when planning to install a lift.

−	[[Category:~~Products_/_components~~]] [[Category:DCN_Product_Knowledge]]	+	[[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Products_/_components]]

Editor at 16:58, 12 February 2019

2019-02-12T16:58:54Z

← Older revision		Revision as of 16:58, 12 February 2019
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	* Lifts for buildings.		* Lifts for buildings.
	* Lifts for office buildings.		* Lifts for office buildings.
		+	* Lift shaft.
	* The importance of service lifts.		* The importance of service lifts.
	* The science of lifts.		* The science of lifts.
	* Top factors to consider when planning to install a lift.		* Top factors to consider when planning to install a lift.

−	[[Category:Products_/_components]]	+	[[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Designing Buildings: moved The hidden mechanics of lift routing to The mechanics of lift routing

2018-11-05T14:35:29Z

moved The hidden mechanics of lift routing to The mechanics of lift routing

← Older revision

Revision as of 14:35, 5 November 2018

Designing Buildings at 14:35, 5 November 2018

2018-11-05T14:35:12Z

← Older revision		Revision as of 14:35, 5 November 2018
Line 9:		Line 9:
	= Manual elevator routing =		= Manual elevator routing =

−	While elevator routing is complex now, it ~~never~~ used to be. The earliest elevators were manually controlled ~~by humans where~~ an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.	+	While elevator routing is complex now, it did not used to be. The earliest elevators were manually controlled and an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.

	= Engineering routing =		= Engineering routing =

−	The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’~~, which was scheduled~~. It was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were ~~plenty of~~ pointless and empty trips ~~made~~.	+	The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’. This was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were pointless and empty trips.

−	In 1965, lift engineers ~~then~~ settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.	+	In 1965, lift engineers settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.

	= Pain index =		= Pain index =

−	When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all of the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.	+	When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.

−	A customised pain index ~~was implemented. This~~ is where the computer system weights the situation of each kind of delay. This algorithm will take into consideration factors of time, delay, etc.	+	A customised pain index is where the computer system weights the situation of each kind of delay. This algorithm will take into consideration factors of time, delay, etc.

	When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.		When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.
Line 37:		Line 37:
	= Computer complexity =		= Computer complexity =

−	When reprogrammable computers became ~~a great asset~~ in the 1970s, the way that lift programming worked changed. It mainly meant that ~~they~~ could test and fine-tune their new routing ideas in software simulations.	+	When reprogrammable computers became readily available in the 1970s, the way that lift programming worked changed. It mainly meant that developers could test and fine-tune their new routing ideas in software simulations.

	A flurry of new algorithms soon became popular, such as the ‘estimated time of arrival’ control. This is where the computer system will consider all lifts moving towards any push of the button and assign the one that will get there the quickest.		A flurry of new algorithms soon became popular, such as the ‘estimated time of arrival’ control. This is where the computer system will consider all lifts moving towards any push of the button and assign the one that will get there the quickest.

−	From this came a now popular algorithm where instead of pressing simply ‘up’ or ‘down, you ~~will~~ enter what floor you want to go to and it will tell you which lift will take you there.	+	From this came a now popular algorithm where instead of pressing simply ‘up’ or ‘down, you enter what floor you want to go to and it will tell you which lift will take you there.

	= Conclusion =		= Conclusion =
Line 47:		Line 47:
	With all these strategies available, engineers are still faced with the problem of which one is the best. However, today’s engineers and lift designers have the added benefit of being able to test techniques. Keep in mind that the type of strategy used will depend on the type of building and the use. One strategy may be good for one type of building, but not for another.		With all these strategies available, engineers are still faced with the problem of which one is the best. However, today’s engineers and lift designers have the added benefit of being able to test techniques. Keep in mind that the type of strategy used will depend on the type of building and the use. One strategy may be good for one type of building, but not for another.

−	Every time someone ~~pushed~~ the call to call a lift, they become a part of the intricate dispatch system.	+	Every time someone pushes the call to call a lift, they become a part of the intricate dispatch system.

	--[[User:Nathan_Massey\|Nathan Massey]] 10:07, 22 Jun 2018 (BST)		--[[User:Nathan_Massey\|Nathan Massey]] 10:07, 22 Jun 2018 (BST)

Editor at 13:17, 26 October 2018

2018-10-26T13:17:57Z

← Older revision		Revision as of 13:17, 26 October 2018
Line 1:		Line 1:
		+	= Introduction =
		+
	It can be easy to take the elevator systems we use on a daily basis for granted. The level of engineering, mathematics and computing which goes into these contraptions contribute to every part of the user’s journey, from pushing the button to getting to their desired floor. The lift itself acts as a computer and must act on many factors. Who’s been waiting the longest? Which is the most efficient path? Which car should be sent first?		It can be easy to take the elevator systems we use on a daily basis for granted. The level of engineering, mathematics and computing which goes into these contraptions contribute to every part of the user’s journey, from pushing the button to getting to their desired floor. The lift itself acts as a computer and must act on many factors. Who’s been waiting the longest? Which is the most efficient path? Which car should be sent first?

−	So, ~~just~~ how does all this work?	+	So, how does all this work?

	[[File:Space_lift.jpg\|link=File:Space_lift.jpg]]		[[File:Space_lift.jpg\|link=File:Space_lift.jpg]]

−	= Manual ~~Elevator Routing~~ =	+	= Manual elevator routing =

	While elevator routing is complex now, it never used to be. The earliest elevators were manually controlled by humans where an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.		While elevator routing is complex now, it never used to be. The earliest elevators were manually controlled by humans where an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.

−	= Engineering ~~Routing~~ =	+	= Engineering routing =

	The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’, which was scheduled. It was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were plenty of pointless and empty trips made.		The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’, which was scheduled. It was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were plenty of pointless and empty trips made.
Line 15:		Line 17:
	In 1965, lift engineers then settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.		In 1965, lift engineers then settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.

−	= Pain ~~Index~~ =	+	= Pain index =

	When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all of the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.		When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all of the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.
Line 23:		Line 25:
	When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.		When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.

−	= The ~~Elevator Algorithm~~ =	+	= The elevator algorithm =

−	Known as ‘collective control’ or the ’[https://www.peters-research.com/index.php?option=com_content&view=article&id=43%253Aunderstanding-the-benefits-and-limitations-of-destination-dispatch&catid=3%253Apapers&Itemid=1 elevator algorithm’] (SCAN), the earliest approach to lift dispatching is still used today.	+	Known as ‘collective control’ or the ’elevator algorithm’ (SCAN), the earliest approach to lift dispatching is still used today.

	SCAN is the same algorithm that some read/write heads on hard drive controllers use and determines the motion of the disks arm and head in servicing read and write request. The algorithm, however, is based originally on the way a lift works, where the elevator continues to travel in its current direction (up or down) until it is ‘empty’; it will stop only to let people off or to pick up people heading in the same direction.		SCAN is the same algorithm that some read/write heads on hard drive controllers use and determines the motion of the disks arm and head in servicing read and write request. The algorithm, however, is based originally on the way a lift works, where the elevator continues to travel in its current direction (up or down) until it is ‘empty’; it will stop only to let people off or to pick up people heading in the same direction.
Line 33:		Line 35:
	Thanks to real-time monitoring and traffic prediction, elevators can now switch between algorithms to adapt to times and situations such as morning rushes in commercial settings.		Thanks to real-time monitoring and traffic prediction, elevators can now switch between algorithms to adapt to times and situations such as morning rushes in commercial settings.

−	= Computer ~~Complexity~~ =	+	= Computer complexity =

−	When reprogrammable computers became a great asset in the ~~70s~~, the way that lift programming worked changed. It mainly meant that they could test and fine-tune their new routing ideas in software simulations.	+	When reprogrammable computers became a great asset in the 1970s, the way that lift programming worked changed. It mainly meant that they could test and fine-tune their new routing ideas in software simulations.

	A flurry of new algorithms soon became popular, such as the ‘estimated time of arrival’ control. This is where the computer system will consider all lifts moving towards any push of the button and assign the one that will get there the quickest.		A flurry of new algorithms soon became popular, such as the ‘estimated time of arrival’ control. This is where the computer system will consider all lifts moving towards any push of the button and assign the one that will get there the quickest.
Line 48:		Line 50:

	--[[User:Nathan_Massey\|Nathan Massey]] 10:07, 22 Jun 2018 (BST)		--[[User:Nathan_Massey\|Nathan Massey]] 10:07, 22 Jun 2018 (BST)
		+
		+	= Related articles on Designing Buildings Wiki =
		+
		+	* Counterweights.
		+	* Lifts and Their Special Operating Modes.
		+	* Lifts for buildings.
		+	* Lifts for office buildings.
		+	* The importance of service lifts.
		+	* The science of lifts.
		+	* Top factors to consider when planning to install a lift.
		+
		+	[[Category:Products_/_components]]

Editor: moved The Hidden Mechanics of Lift Routing to The hidden mechanics of lift routing

2018-10-26T13:10:12Z

moved The Hidden Mechanics of Lift Routing to The hidden mechanics of lift routing

← Older revision

Revision as of 13:10, 26 October 2018

Nathan Massey at 09:07, 22 June 2018

2018-06-22T09:07:40Z

← Older revision		Revision as of 09:07, 22 June 2018
Line 3:		Line 3:
	So, just how does all this work?		So, just how does all this work?

−	[[File:~~Space lift~~.jpg]]	+	[[File:Space_lift.jpg\|link=File:Space_lift.jpg]]

−	Manual Elevator Routing	+	= Manual Elevator Routing =

	While elevator routing is complex now, it never used to be. The earliest elevators were manually controlled by humans where an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.		While elevator routing is complex now, it never used to be. The earliest elevators were manually controlled by humans where an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.

−	Engineering Routing	+	= Engineering Routing =

	The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’, which was scheduled. It was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were plenty of pointless and empty trips made.		The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’, which was scheduled. It was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were plenty of pointless and empty trips made.
Line 15:		Line 15:
	In 1965, lift engineers then settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.		In 1965, lift engineers then settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.

−	Pain Index	+	= Pain Index =

	When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all of the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.		When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all of the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.
Line 23:		Line 23:
	When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.		When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.

−	The Elevator Algorithm	+	= The Elevator Algorithm =

	Known as ‘collective control’ or the ’[https://www.peters-research.com/index.php?option=com_content&view=article&id=43%253Aunderstanding-the-benefits-and-limitations-of-destination-dispatch&catid=3%253Apapers&Itemid=1 elevator algorithm’] (SCAN), the earliest approach to lift dispatching is still used today.		Known as ‘collective control’ or the ’[https://www.peters-research.com/index.php?option=com_content&view=article&id=43%253Aunderstanding-the-benefits-and-limitations-of-destination-dispatch&catid=3%253Apapers&Itemid=1 elevator algorithm’] (SCAN), the earliest approach to lift dispatching is still used today.
Line 33:		Line 33:
	Thanks to real-time monitoring and traffic prediction, elevators can now switch between algorithms to adapt to times and situations such as morning rushes in commercial settings.		Thanks to real-time monitoring and traffic prediction, elevators can now switch between algorithms to adapt to times and situations such as morning rushes in commercial settings.

−	Computer Complexity	+	= Computer Complexity =

	When reprogrammable computers became a great asset in the 70s, the way that lift programming worked changed. It mainly meant that they could test and fine-tune their new routing ideas in software simulations.		When reprogrammable computers became a great asset in the 70s, the way that lift programming worked changed. It mainly meant that they could test and fine-tune their new routing ideas in software simulations.
Line 41:		Line 41:
	From this came a now popular algorithm where instead of pressing simply ‘up’ or ‘down, you will enter what floor you want to go to and it will tell you which lift will take you there.		From this came a now popular algorithm where instead of pressing simply ‘up’ or ‘down, you will enter what floor you want to go to and it will tell you which lift will take you there.

−	Conclusion	+	= Conclusion =

	With all these strategies available, engineers are still faced with the problem of which one is the best. However, today’s engineers and lift designers have the added benefit of being able to test techniques. Keep in mind that the type of strategy used will depend on the type of building and the use. One strategy may be good for one type of building, but not for another.		With all these strategies available, engineers are still faced with the problem of which one is the best. However, today’s engineers and lift designers have the added benefit of being able to test techniques. Keep in mind that the type of strategy used will depend on the type of building and the use. One strategy may be good for one type of building, but not for another.
Line 47:		Line 47:
	Every time someone pushed the call to call a lift, they become a part of the intricate dispatch system.		Every time someone pushed the call to call a lift, they become a part of the intricate dispatch system.

−	--[[User:~~Nathan Massey~~\|Nathan Massey]] 10:07, 22 Jun 2018 (BST)	+	--[[User:Nathan_Massey\|Nathan Massey]] 10:07, 22 Jun 2018 (BST)

Nathan Massey: Created page with "It can be easy to take the elevator systems we use on a daily basis for granted. The level of engineering, mathematics and computing which goes into these contraptions contribute..."

2018-06-22T09:07:08Z

Created page with "It can be easy to take the elevator systems we use on a daily basis for granted. The level of engineering, mathematics and computing which goes into these contraptions contribute..."

New page

It can be easy to take the elevator systems we use on a daily basis for granted. The level of engineering, mathematics and computing which goes into these contraptions contribute to every part of the user’s journey, from pushing the button to getting to their desired floor. The lift itself acts as a computer and must act on many factors. Who’s been waiting the longest? Which is the most efficient path? Which car should be sent first?

So, just how does all this work?

[[File:Space lift.jpg]]

Manual Elevator Routing

While elevator routing is complex now, it never used to be. The earliest elevators were manually controlled by humans where an attendant would stand inside and drive the lift up and down with a throttle, stopping wherever needed. This changed in the 1950s due to human error, expensive wages and strikes. This meant electrical switches took over and engineers had to spell out the rules for the lifts.

Engineering Routing

The simplest method was for the elevators to shuttle back and forth between floors that were predefined as ‘terminal floors’, which was scheduled. It was similar to waiting for a bus. However, this was quite inconvenient and during off-peak hours there were plenty of pointless and empty trips made.

In 1965, lift engineers then settled on the model of passengers pushing buttons to call the elevator which then triggered the lift to respond. However, this caused an issue of a number of pickup and drop-off requests from various different parts of the building at the same time.

Pain Index

When you imagine the perfect lift system what do you think it includes? Lift engineers tackle this question all of the time and have to debate if the answer is serving the person who’s been waiting the longest, compromise between speed and energy usage, or something else altogether.

A customised pain index was implemented. This is where the computer system weights the situation of each kind of delay. This algorithm will take into consideration factors of time, delay, etc.

When you factor in the constraints that all lifts have, such as physical speed limits, a good system will aim to balance out all the ‘goals’.

The Elevator Algorithm

Known as ‘collective control’ or the ’[https://www.peters-research.com/index.php?option=com_content&view=article&id=43%253Aunderstanding-the-benefits-and-limitations-of-destination-dispatch&catid=3%253Apapers&Itemid=1 elevator algorithm’] (SCAN), the earliest approach to lift dispatching is still used today.

SCAN is the same algorithm that some read/write heads on hard drive controllers use and determines the motion of the disks arm and head in servicing read and write request. The algorithm, however, is based originally on the way a lift works, where the elevator continues to travel in its current direction (up or down) until it is ‘empty’; it will stop only to let people off or to pick up people heading in the same direction.

This is the standard algorithm; however, engineers may choose a different approach if the use calls for it. Larger buildings and commercial lifts may use a more complex approach or numerous algorithms where engineers will use a number of tricks such as the ‘parking’ strategy, where elevators will automatically return to the most commonly requested floor.

Thanks to real-time monitoring and traffic prediction, elevators can now switch between algorithms to adapt to times and situations such as morning rushes in commercial settings.

Computer Complexity

When reprogrammable computers became a great asset in the 70s, the way that lift programming worked changed. It mainly meant that they could test and fine-tune their new routing ideas in software simulations.

A flurry of new algorithms soon became popular, such as the ‘estimated time of arrival’ control. This is where the computer system will consider all lifts moving towards any push of the button and assign the one that will get there the quickest.

From this came a now popular algorithm where instead of pressing simply ‘up’ or ‘down, you will enter what floor you want to go to and it will tell you which lift will take you there.

Conclusion

With all these strategies available, engineers are still faced with the problem of which one is the best. However, today’s engineers and lift designers have the added benefit of being able to test techniques. Keep in mind that the type of strategy used will depend on the type of building and the use. One strategy may be good for one type of building, but not for another.

Every time someone pushed the call to call a lift, they become a part of the intricate dispatch system.

--[[User:Nathan Massey|Nathan Massey]] 10:07, 22 Jun 2018 (BST)