Attenuation Of Grass Trimmer Handle Vibration Using Imposing Node Technique
| dc.contributor.author | Ko, Ying Hao | |
| dc.date.accessioned | 2019-06-24T02:20:54Z | |
| dc.date.available | 2019-06-24T02:20:54Z | |
| dc.date.issued | 2012-06 | |
| dc.description.abstract | Prolonged use of grass trimmer exposes the user to the risk of hand-arm vibration syndrome. Imposing node technique was investigated in order to achieve low vibration (node) at the grass trimmer handle location. It is established that, for the grass trimmer system which can be modelled as a beam, the vibration at the handle location can be minimized. The mathematical model of grass trimmer system is presented, and a criterion for implementing the vibration attenuation by imposing node technique is developed. The optimum tuning frequencies of tuned vibration absorbers (TVAs) attached at the points of 0.74L and 0.85L along the shaft of grass trimmer were determined using this approach. Transverse deflection, experimental modal analysis, and operating deflection shape analysis of the grass trimmer were carried out and TVAs were designed and fabricated to validate the proposed theory and display its practicality. The results indicated that node was induced in the vicinity of the loop handle location (0.79L). Moreover, the vibration along the segment of the shaft (0.70L-0.94L) was also found to have relatively small amplitude. The TVAs were found to have best performance with 71% reduction on the frequency-weighted rms acceleration at loop handle and 72% for rear handle. The results from modal analysis and operating deflection shape revealed that the presence of TVAs has successfully reduced the large deformations of the loop and rear handle where the node was shifted nearer to the handle location. The effect of TVAs was also evaluated during the field test involving grass trimming operation and subjective rating. The results indicated that average reduction of frequency-weighted rms acceleration was by 25%, 69%, 17%, 58% in Xh-, Yh-, Zh-axes and hv a respectively during the cutting operation. From the field test, subjective rating of vibration perception consistently rate better for controlled grass trimmer. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/8348 | |
| dc.language.iso | en | en_US |
| dc.publisher | Universiti Sains Malaysia | en_US |
| dc.subject | Attenuation of grass trimmer handle vibration | en_US |
| dc.subject | using imposing node technique | en_US |
| dc.title | Attenuation Of Grass Trimmer Handle Vibration Using Imposing Node Technique | en_US |
| dc.type | Thesis | en_US |
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