Page 7 - Brochure
P. 7

The graphs below compare test data from two hydraulic bu ers that both meet the elevator code specification requirement being used to stop an elevator car travelling at 3m/s. 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
Elevator Speed Max Mass Oleo MLB25
3m/s
5500 kg
Alternative Supplier
0 0.05 0.1
0.15 0.2 0.25 0.3 Time in seconds
0.35 0.4 0.45 0.5
The performance of the Oleo and the alternative supplier’s elevator bu er 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 MLB25
0.35 0.4
3m/s
450 kg
Alternative Supplier
0.45 0.5
The performance of the Oleo bu er design shows its benefits with a much lower peak deceleration force of 2.6g in comparison to 10g for the alternative supplier’s elevator bu er.
In both load conditions both bu ers 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 bu ers 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 bu er 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 bu ers enable Oleo unsurpassed force control. The design philosophy is to minimise g force for all passenger load conditions the benefits are highlighted in the test data shown above.
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G Force G Force


































































































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