Difficulties in Comparing the Results of Lift-Traffic-Simulations by Hans M. Jappsen and Olaf Rieke This paper was presented at USA 2012, the International Congress on Vertical Transportation Technologies and first published in IAEE book Elevator Technology 19, edited by A. Lustig. It is a reprint with permission from the International Association of Elevator Engineers (website:…
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by Lutfi Al-Sharif, Hasan Algzawi and Ahmad Hammoudeh RTT is the basis for designing elevator systems. There are several different methods (both analytical and numerical) for calculating it. As a building’s traffic conditions become more complicated, analytical methods become intractable. Numerical methods offer an attractive alternative for calculating RTT, which is the time taken by…
Read More Group Configurations Define Group Efficiency and Performance All groups with large cars are inefficient. During periods of heavy traffic, large cars make many time-consuming stops to distribute and/or collect high numbers of passengers. This implies long round-trip times (RTTs). Their performance and efficiency is worst during periods with heaviest traffic. During average traffic conditions, RTTs…
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The traffic patterns of hotels and residential buildings is examined in this revisiting of Strakosch’s analysis. by Dr. Marja-Liisa Siikonen, Janne Sorsa, Juha-Matti Kuusinen and Henri Hakonen Traffic patterns for morning up-peak, lunch hour and daily traffic are simulated to determine passenger-service levels during traffic peaks and throughout the day. In the latest publications on…
Read More One of the most dangerous things that can happen with traction elevators is shearing due to a brake slip. Unfortunately, it is also one of the most difficult to prevent, because it may stem from defects in the traditional, control-mode elevator. In the long-term evolution of an elevator’s entire safety system, many features have been…
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After 30 Years, D&D Elevator is still growing, thanks to a solid foundation, strong client relationships and an emphasis on education. D&D Elevator Maintenance, Inc. President Bobby Schaeffer always says, “For the future, I want two lines out the door – one for employees who want to work for D&D and the other for customers…
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Part one of this series examined Otis Brothers’ steam-powered elevators, and part two examined American hydraulic elevators, both as seen through the eyes of engineer Alois Riedler (1850-1936), author of the Austrian delegation’s report on elevators displayed at the 1876 Centennial Exhibition in Philadelphia. Riedler’s report, titled Personen- und Lastenaufzüge und Fördermaschinen (Passenger Elevators, Freight…
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NAESA International and the State of Wisconsin Elevator Symposium join forces for the second consecutive year. NAESA International held its annual business and general-membership meetings, along with educational sessions, during the fourth-annual State of Wisconsin Elevator Symposium at the Lake Geneva Grand Resort in Lake Geneva, Wisconsin, on October 24-26, 2013. Eschewing its traditional annual…
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Category 8: Private-Residence Elevators submitted by Farid Waleh, Custom Cabs, Inc. Installed in 2012, the elevator in this beach house on a bluff overlooking the Pacific Ocean promises to be a conversation piece for years to come. It is constructed of glass and stainless steel to blend in and complement the house’s sleek, modern design…
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Category 5: Moving Walks submitted by Kellie Lindquist, KONE Inc. Driven by code, safety and reliability factors, Atlanta Airlines Terminal Corp. (AATC) contracted with KONE in September 2009 for Phase 1 of the Hartsfield-Jackson Atlanta International Airport “Vertical Transportation Upgrades” project. The scope was expanded in May 2011, when Phase 2 of the project was…
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