Investigating a power tiller vibration transmissibility using diesel-biodiesel fuel blends on stationary conditions.

The wide use of fossil fuel in internal combustion engine cause reduction in these fuel resources and also increase in greenhouse gasses and environmental pollution, for conquering these problems, so many researches have done for finding the renewable herbaceous fuel. Between these different kinds of fuel, biodiesel seems to be appropriate because of the nonexistence of air pollutions and the existence of similar trait with diesel fuel. In this research, vibration of 13hp power tiller in 5 levels of engine speed and 6 levels of consuming fuel blends for investigating the power tiller engine vibration behavior and the vibration transmissibility. Results showed that vibration transmissibility is decreased by increasing the engine speed. The maximum of the vibration transmissibility is happened in B20 and B5 and minimum of it is happened in B15 and D respectively. Also it is observed that the amount of vibration acceleration in longitudinal axis is much more than other two axes. The vibration acceleration value, in the frequency range of 8 to 100 Hz was higher than a dangerous frequency range of hand-arm vibration transmission and the total weighted acceleration has the maximum value at the frequency of 20, 31.5, 40 and 63 Hz with the vibration amplitude reach up to 20, 12.6, 18.6 and 40 m/s2 respectively. The best engine speed are 1400, 1600 and 2000 rpm, in this Engine speed using the B20 and B5 seems appropriate.

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