Page 7 - Elevator-series-brochure-USA

The graphs below compare test data from two hydraulic buffers that both meet the elevator code specification requirement being used to stop an elevator car travelling at 591ft/min. This shows the g force that will be experienced by passengers travelling in fully and lightly loaded conditions.
10.00 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 -1.0
Fully loaded elevator
0 0.05 0.1 0.15
0.2 0.25 0.3 Time in seconds
Elevator Speed Max Mass Oleo SEB 25
0.35 0.4
591ft/min
10020 lbs Alternative Supplier
0.45 0.5
The performance of the Oleo and the alternative supplier’s elevator buffer is similar.
10.00 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 -1.0
Lightly loaded elevator
0 0.05 0.1 0.15
0.2 0.25 0.3 Time in seconds
Elevator Speed Min Mass Oleo SEB 25
0.35 0.4
591ft/min
992 lbs
Alternative Supplier
0.45 0.5
The performance of the Oleo buffer design shows its benefits with a much lower peak deceleration force of 2.6g in comparison to 10g for the alternative supplier’s elevator buffer.
In both load conditions both buffers keep the average deceleration below 1g and do not allow 2.5g for more than 40 milliseconds and therefore are both fully compliant with elevator code specification requirements.
The limiting of peak deceleration force is not required by any elevator code or industry specification. Alternative buffers achieve the average 1g criterion by an initial period of high deceleration followed by extending the final stages as the elevator is coming to rest. The other key elevator buffer specification requires that passengers do not experience more than 2.5g for more than 40 milliseconds but within this period g forces are not limited. However, as illustrated above, in certain conditions very high instantaneous g forces occur and this may cause passenger discomfort.
Oleo has an overall passenger safety aware approach and seeks to avoid the passenger discomfort that may arise from instantaneous deceleration that may even exceed 10g in some circumstances. Many years of in-house testing and the development of mathematical algorithms that accurately simulate the performance of hydraulic buffers enable Oleo unsurpassed force control. The design philosophy is to minimize g force for all passenger load conditions the benefits are highlighted in the test data shown above.
OLEO INTERNATIONAL 7
TECHNICAL
G Force G Force