VARIASI KONSTANTA ELASTIS PIPA FLEKSIBEL PADA GETARAN YANG DIBANGKITKAN SENDIRI DALAM ALIRAN FLUIDA

Authors

  • Sufiyanto Sufiyanto Universitas Merdeka Malang

DOI:

https://doi.org/10.26905/jtmt.v5i1.4505

Keywords:

Selft Vibration, Pinch Ratio, Konstanta Pegas, Karakteristik Getaran

Abstract

Fenomena getaran yang dibangkitkan sendiri (self excited vibration) ditimbulkan oleh adanya perubahanluasan penampang aliran akibat adanya jepitan (pinch). Pada suatu nilai tertentu, akan timbul osilasi yangkemudian berkembang menjadi amplitudo yang lebih besar akibat kondisi yang tak stabil dalam aliran saatmelewati daerah jepitan. Metode yang digunakan untuk memunculkan getaran ini adalah metode fixed flowrate yaitu besarnya jepitan diatur sampai terjadi getaran dengan kecepatan aliran tetap. Tujuan penelitianuntuk mengetahui aspek-aspek dan karakteristik dalam aliran fluida yang dapat mengakibatkan terjadinyagetaran yang dibangkitkan sendiri oleh sistem (self-excited vibrations), dengan variasi konstanta elastis pegas(K) dari selang (tube) pada aliran fluida yang mengalami getaran yang dibangkitkan sendiri (self-excitedvibrations). Hasil penelitian menunjukkan bahwa getaran yang dibangkitkan sendiri muncul pada kondisialiran kritis yang ditentukan dengan pinch ratio antara 63% s/d 68% pada kapasitas aliran antara15 liter/menit s/d 20 liter/menit. Karakteristik getaran yang muncul menunjukkan peningkatan frekwensitetapi amplitudo getaran berkurang dengan bertambahnya pinch ratio. Rentang frekwensi getaran antaraantara 2 s/d 14 Hz dengan amplitudo ± 0.25 s/d 2.25 mm. Perubahan konstanta pegas dari selangmenunjukkan perubahan yang kurang signifikan terhadap frekwensi getaran yang dihasilkan, tetapimempersempit rentang pinch ratio dimana getaran tersebut muncul.

Author Biography

Sufiyanto Sufiyanto, Universitas Merdeka Malang

Jurusan Teknik Mesin

References

Anssari, A., 2008. A New System to Analyze Pulsatile Flow Characteristics in Elastic Tubes for Hemodynamic Applications, American Journal of Applied Sciences 5 (12): 1730-1736, ISSN 1546-9239, © 2008 Science Publications

Chen, S.S., and G.S. Rosenberg, 1973. Vibration And Stability Of A Tube Conveying Fluid, Argone National Laboratories ANL-7762, Int Ref. N71 – 34631

Hazel, L., and Matthias Heil, 2003. Finite-Reynolds-Number Flows In Three-Dimensional Collapsible Tubes, J. Fluid Mech. (2003), vol. 486, pp. 79–103. @ 2003 Cambridge University Press 79 DOI: 10.1017/S0022112003004671, United Kingdom

Heil, Matthias, And Sarah L. Waters, 2006. Transverse Flows In Rapidly Oscillating Elastic Cylindrical Shells, J. Fluid Mech. (2006), vol. 547, pp. 185–214. @ 2006 Cambridge University Press 185 DOI:10.1017/S0022112005007214, United Kingdom

Housner, 1954. Bending Vibrations Of A Pipeline Containing Flowing Fluid, J. Appl Meh 1954.74.205. Int Ref. HPO 469

Munson, Bruce R., 2003, Fundamentals of Fluid Mechanics, 4th edn, John Wiley & Sons Inc., New York

Naguleswararn, S., & C.J.H. Williams, 1968. Lateral Vibrations Of A Tube Containing A Fluid, J Mech Eng. Eng Sci 10 (3) 228-238 1968 Int Ref., 472

Olesen, H. P., Detection Of Pressure Variations In Thin Walled Tubes By Vibration Measurements, www.bksv.com/doc/13-069.pdf

Pejack, E. R., 2006. Apparatus For Demonstrating Self-excited Vibrations In Fluid Flow, Department of Mechanical Engineering, University of the Pacific, Stockton, California 95211, USA

Thompson, W., M. Dahleh, 1998. Theory of Vibration with Applications, 5th edn, Prestice-Hall, Upper Saddle River, NJ Walker, Rocky, 2007, Fluid Power Handbook & Directory, Nevada,

http://www.hydraulicspneumatics.com, December 2008

Wardana, I.N.G., 2000. Getaran Pipa Akibat Aliran Fluida, Proc. Piping Technology Seminar 2000, p. 213-221.

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Published

2010-02-15

Issue

Vol. 5 No. 1 (2009): Edisi Pebruari 2009

Section

Article

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