Share This Article:

An Investigation on the Dynamic Stability of Scissor Lift

Abstract Full-Text HTML Download Download as PDF (Size:1114KB) PP. 8-15
DOI: 10.4236/ojsst.2012.21002    10,730 Downloads   22,709 Views   Citations

ABSTRACT

The tip-over of scissor lifts in operation has frequently resulted in the death and/or severe injuries of workers. The objective of this study is to enhance the understanding of its major mechanisms and factors influencing scissor lift stability. Both experimental and modeling approaches were used in this study. Two series of experiments were performed under possible tip-over scenarios: curb impact and pothole depression. Based on the dynamic characteristics identified from the experimental results, a lumped-parameter model of the scissor lift was developed. It was applied to investigate the effect of scissor structure flexibility on the tip-over potential of the lift, to understand tip-over mechanisms, and to ex-plore preventive strategies. This study found that the fundamental natural frequencies of the lift were generally in a range of 0.30 - 2.08 Hz, which are likely related to the tip-over. Increasing flexibility of the lift structure generally increased the tip-over potential. The tip-over threshold was also a function of both ground slope and tilt speed of the lift. The results suggest that the lift should not be elevated on largely deformable and/or uneven surfaces such as bridged wood board or a soft soil base. The worker on the lift platform should avoid any large continuous periodic movement or forceful action in the horizontal plane, especially when the lift is fully elevated. Besides the tilt angle of the lift, the tilt speed should be monitored to help prevent the tip-over.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

R. Dong, C. Pan, J. Hartsell, D. Welcome, T. Lutz, A. Brumfield, J. Harris, J. Wu, B. Wimer, V. Mucino and K. Means, "An Investigation on the Dynamic Stability of Scissor Lift," Open Journal of Safety Science and Technology, Vol. 2 No. 1, 2012, pp. 8-15. doi: 10.4236/ojsst.2012.21002.

References

[1] M. J. Burkart, M. McCann and D. M. Paine, “Aerial Work Platforms, in Elevated Work Platforms and Scaffolding,” McGraw-Hill, New York, 2004.
[2] S. Mohan and W. C. Zech, “Characteristics of Worker Accidents on NYSDOT Con-struction Projects,” Journal of Safety Research, vol. 36, No. 4, 2005, pp. 353-360. Hdoi:10.1016/j.jsr.2005.06.012
[3] M. McCann, “Death in Construction Related to Personnel Lifts, 1992-1999,” Journal of Safety Research, Vol. 34, No. 5, 2003, pp. 507-514. Hdoi:10.1016/j.jsr.2003.07.001
[4] C. S. Pan, A. Hoskin, M. McCann, D. Castillo, M. Lin and K. Fern, “Aerial Lift Fall Injuries: A surveillance and Evaluation Approach for Targeting Prevention Activities,” Journal of Safety Research, Vol. 38, No. 6, 2007, pp. 617-625. Hdoi:10.1016/j.jsr.2007.08.002
[5] ISO 16653, “Mobile Elevating Work Platforms—Design Calcula-tions, Safety Requirements and Test Methods,” International Organization for Standardization, Geneva, 2003.
[6] ANSI A92.6, “Self-Propelled Elevating Aerial Work platforms,” American National Standards Institute, New York, 1999.
[7] R. F. Abo-Shanab and N. Sepehri, “Tip-Over Sta-bility of Manipulator-Like Mobile Hydraulic Machines,” Jour-nal of Dynamic Systems Measurement and Control, Vol. 127, No. 2, 2005, pp. 295-301. Hdoi:10.1115/1.1898239
[8] A. HGhasempoorH and N. HSepehriH, “A Measure of Stability for Mo-bile Manipulators with Application to Heavy-Duty Hydraulic Machines,” Journal of Dynamic Systems, Measurement, and Control, Vol. 120, No. 3, 1998, pp. 360-370. Hdoi:10.1115/1.2805410H
[9] S. Tamate, N. Suemasa and T. Katada, “Analyses of Instability in Mobile Cranes Due to Ground Penetration by Outriggers,” Journal of Construction Engineering and Management, Vol. 131, No. 6, 2005, pp. 698-704. Hdoi:10.1061/(ASCE)0733-9364(2005)131:6(689)
[10] “ADAMS Guide,” 2007 Version, MSC Software Incorporated, Ann Arbor, USA.

  
comments powered by Disqus

Copyright © 2018 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.