Vibration Suppression of Grass Trimmer Handle using Tunable Vibration Absorber

Subject Areas : vibration and control

Sushil Sahebrao  Patil ¹ (Department of Mechanical Engineering, College of Engineering Malegaon (Bk), Savitribai Phule Pune University, India)

Received: 2018-12-26 Accepted : 2019-05-25 Published : 2019-06-01

Keywords: Handle Vibration, Grass Trimmer, Vibration control, Vibration Absorber, Modal Analysis,

Abstract :

The electrical grass trimmers are widely used for cutting grass along the highways, roadside & general agricultural work. Grass trimming involves the use of motorized cutter spinning at high speed, resulting in hand-arm vibration syndrome among the machine operators. The purpose of this work is to reduce the handle vibration of grass trimmer using tuned vibration absorber (TVA). The variable stiffness dual mass vibration absorber is designed using Dunkerleys Equation and fabricated for testing. The experimental modal analysis of absorber is conducted to find resonance frequencies of the absorber and to validate the results obtained from equations. The experimental tests are carried on grass trimmer with absorber attached at different location for two cutter head positions to find the absorber attachment location to reduce handle vibrations to minimum level. The results indicated that the vibration attenuation is affected by the location of absorber and cutter head position of grass trimmer.

References:

[1]    Brown, A. P., The Effects of Anti-Vibration Gloves on Vibration Induced Disorders: a Case Study, Journal of Hand Therapy, Vol. 3, No. 2, 1990, pp. 94-100, DOI: 10.1016/S0894-1130(12) 80007-X.

[2]    Muralidhar, A., Bishu, R., and Hallbeck, M., The Development and Evaluation of an Ergonomic Glove, Applied Ergonomics, Vol. 30, No. 6, 1999, pp. 555-563,DOI:10.1016/S0003-6870(99)00005-8.

[3]    Sam, B., Kathirvel, K., Vibration Characteristics of Walking and Riding Type Power Tillers, Biosystems Engineering, Vol. 95, No. 4, 2006, pp. 517-52 DOI:10.1016/j.biosystemseng. 2006.08.013.

[4]    Tewari, V. K., Dewangan, K. N., Effect of Vibration Isolators in Reduction of Work Stress During Field Operation of Hand Tractor, Biosystems Engineering., Vol. 103, No. 2, 2009, pp. 146-158. DOI: 10.1016/j.biosystemseng.2009.03.002

[5]    Rakheja, S., Dong, R., Welcome, D., and Schopper, A. W., Estimation of Tool-Specific Isolation Performance of Antivibration Gloves, International Journal of Industrial Ergonomic, Vol. 30, No. 2, 2002, pp. 71-87. DOI: 10. 1016/S0169-8141 (02)00071-9.

[6]    Fasana, A., Giorcelli, E. A., Vibration Absorber for Motorcycle Handles, Meccanica, Vol. 45, No. 1, 2010, pp. 79-88. DOI: 10.1007/ s11012-009-9229-8.

[7]    Golysheva, E. V., Babitsky, V. I., and Veprik, A. M., Vibration Protection for an Operator of a Hand-Held Percussion Machine, Journal of Sound and Vibration, Vol. 274, No. 1-2, 2004, pp. 351-367. DOI: 10.1016/j.jsv.2003.05.019.

[8]    Kadam, R., Vibration Characterization and Numerical Modeling of a Pneumatic Impact Hammer, Master Thesis, Virginia Polytechnic Institute and State University, July 20, 2006.

[9]    Mallick, Zulquernain., Optimization of the Operating Parameters of Grass Trimming Machine, Applied Ergonomics, Vol. 41, No. 2, 2010, pp. 260-265, DOI:10.1016/j.apergo. 2009. 07.010

[10] Hao, K. Y., Mei, L. X., and Ripin, Z. M., Tuned Vibration Absorber for Suppression of Hand-Arm Vibration in Electric Grass Trimmer, International Journal of Industrial Ergonomics, Vol. 41, No. 5, 2011, pp. 494-508, DOI: 10.1016/j.ergon.2011.05.005

[11] Hao, K. Y., Ripin, Z. M., Nodal Control of Grass Trimmer Handle Vibration, International Journal of Industrial Ergonomics, Vol. 43, No. 1, 2013, pp. 18-30, DOI: 10.1016/j.ergon.2012.10.007.

[12] Sheth, A. J., Design and Performance Evaluation of Tuned Vibration Absorber for the Vibration Control of a Centrifugal Pump, Int. J of Advanced Design and Manufacturing Technology, Vol. 7, No. 1, 2014, pp. 53-58.

[13] Patil, S. S., Grass Trimmer Handle Vibration Reduction by Imposing Node Method Using Vibration Absorber, Noise and Vibration Worldwide, Vol. 49, No. 2, 2018, pp. 50-61. DOI: 10.1177/0957456518763158. 

[14] Hill, S. G., Snyder, S. D., Design of an Adaptive Vibration Absorber to Reduce Electrical Transformer Structural Vibration, Journal of Vibration and Acoustics, Vol. 124, No. 3, 2002, pp. 606-6011, DOI: 10.1115/1.1500338.

[15] Thomson, W. T., Dahleh, M. D., Theory of Vibration with Application, Prentice Hall, 1997, ISBN-0 7487 4380 4.