Measurement and Analysis of Handle Vibration for Grass Trimmers and Brush Cutters
Date Issued
2011
Date
2011
Author(s)
Chang, Chen-Yueh
Abstract
There are estimated about ten thousands of workers who use grass trimmers and brush cutters in Taiwan. Grass trimmers and brush cutters are cheaper, more portable, easier operation than other forms of lawn mowers, so they are widely used in field of horticulture and weed removal. It will cause human body damage if a user operates a grass trimmer or brush cutter for a long time, because such machines will deliver vibration from the tool handle to the human arm. The type of vibration is also called hand - arm vibration. After operating a grass trimmer or brush cutter for a long time, it will also cause disease of skeleton, muscle and nerve.
This study is based on ISO 5349. The measurement system consists of a hand-arm vibration measurement set (Svantek SV51), a power supply/coupler (KISTLER 5134) and a data recorder (Kyowa RTP-50A). The measurement data are then analyzed by a signal analyzer (Bruel & Kjar Type 2035). The daily working time and career lifetime that based on international standard of hand-arm vibration can also be calculated.
The results show that the total acceleration of such machines increases when the engine speed increases. The vibration caused by the two blades as cutter is significantly greater than that caused by monofilament cutting device. According to Directive 2002/44/ec of the European parliament and of the council, the maximum daily working hours are between 2.75 to 6.70 hours. The career lifetime is between 3.28 to 5.23 years according to ISO-5349. By using Taguchi method, the contributions of total vibration with the factors of machine types, engine speed and cutting device account for 5.80%, 56.88% and 24.94% separately. And in this case, this method can also find an optimal operating parameter with using knap sack of brush cutters, 4500 rpm of engine speed and monofilament of cutting device.
Subjects
hand-arm vibration,grass trimmer
brush cutter
frequency analysis
Taguchi method
SDGs
Type
thesis
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