Optimization of the orifice flow in shock absorber using shape memory alloys wire

Nik Abdullah Mohamed, Ahmad Kamal Ariffin Mohd Ihsan, Shahrir Abdullah, W. B. Ng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper studies the optimization of the orifice's flow in shock absorber using shape memory alloys (SMA) wire. The motivation for this optimization is to ensure that the damping properties of shock absorber remained intact over the longer period of operating time and hence to maintain the overall energy dissipating performance of the damping system. The temperature of hydraulic fluid in a shock absorber increases every time when high-energy impacts have to be absorbed by the system. This in turn will lead to drop of viscosity of the fluid. Thus at the fixed size of orifice's opening, the fluid's flow rate through the orifice is significantly higher compare to the rate at lower temperature. The high flow rate through the orifice will impose in the end a negative impact to the energy dissipating capability of the shock absorber. In other words, the high flow rate through the orifice will induce the degeneration of damping constant and hence shorten the lifetime of the shock absorber. The paper discussed the possibility of varying the size of orifice's opening in order to reduce the volume flow rate through the orifice. For the purpose of varying the size of orifice's opening a piece of SMA wire was placed in the proximity of the orifice. The SMA wire was in such a way configured that at low temperature it will let the fluid flow through the orifice without hindrance and at high temperature it closes part of orifice's opening, so that the fluid flows through the orifice with significant amount of resistance. Although, the viscosity of fluid decreases, consequently the cross sectional area of orifice also decreases and the damping constant will improve. The application of this device has been experimentally and analytically studied. The study included component testing over a range of temperature, modeling of the orifice flow of absorber's fluid, analytical prediction of response and development of simplified analysis procedures. Experimental results demonstrate a significant improvement of damping constant due to the reduction of volume flow rate through the orifice at high temperature.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages204-212
Number of pages9
Volume3989
Publication statusPublished - 2000
EventSmart Structures and Materials 2000: Damping and Isolation - Newport Beach, CA, USA
Duration: 6 Mar 20008 Mar 2000

Other

OtherSmart Structures and Materials 2000: Damping and Isolation
CityNewport Beach, CA, USA
Period6/3/008/3/00

Fingerprint

orifice flow
shock absorbers
Shock absorbers
orifices
shape memory alloys
Orifices
Shape memory effect
wire
Wire
optimization
flow velocity
damping
Damping
Flow rate
fluid flow
Flow of fluids
fluids
Temperature
Fluids
hydraulic fluids

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Mohamed, N. A., Mohd Ihsan, A. K. A., Abdullah, S., & Ng, W. B. (2000). Optimization of the orifice flow in shock absorber using shape memory alloys wire. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3989, pp. 204-212). Society of Photo-Optical Instrumentation Engineers.

Optimization of the orifice flow in shock absorber using shape memory alloys wire. / Mohamed, Nik Abdullah; Mohd Ihsan, Ahmad Kamal Ariffin; Abdullah, Shahrir; Ng, W. B.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3989 Society of Photo-Optical Instrumentation Engineers, 2000. p. 204-212.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mohamed, NA, Mohd Ihsan, AKA, Abdullah, S & Ng, WB 2000, Optimization of the orifice flow in shock absorber using shape memory alloys wire. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3989, Society of Photo-Optical Instrumentation Engineers, pp. 204-212, Smart Structures and Materials 2000: Damping and Isolation, Newport Beach, CA, USA, 6/3/00.
Mohamed NA, Mohd Ihsan AKA, Abdullah S, Ng WB. Optimization of the orifice flow in shock absorber using shape memory alloys wire. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3989. Society of Photo-Optical Instrumentation Engineers. 2000. p. 204-212
Mohamed, Nik Abdullah ; Mohd Ihsan, Ahmad Kamal Ariffin ; Abdullah, Shahrir ; Ng, W. B. / Optimization of the orifice flow in shock absorber using shape memory alloys wire. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3989 Society of Photo-Optical Instrumentation Engineers, 2000. pp. 204-212
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