Diesel-Biodiesel Fuel Effect on the Vibration Acceleration Envelope Curves of a Riding Two-Wheel Power Tiller

Application of two-wheel tractors is being increased as the main source of power supply for agricultural equipment due to their economic benefits. The single-cylinder diesel engine used in these tractors and the lack of suspension system are the main cause for the generation of high levels of vibrations. In addition, excessive using of non-renewable fossil fuels as the fuel of internal combustion engine and environmental pollution are the problems of the tractor engine. In this study, bio-renewable energy including various blended diesel-biodiesel fuels was consumed in the engine of a 13-hp power tiller to reduce the vibration. To do so, the maximum and minimum vibration acceleration envelope curves of the engine were investigated when the different percentage of biodiesel was added to the pure diesel fuel. Time domain vibration acceleration signals of the power tiller handle and trailer seat were measured and stored at four gear ratios, five engine rotational speeds as well as five blended fuels (B0, B2, B4, B6, B8) and at three directions. Then, the root mean square (RMS) values of vibration acceleration in all speeds, ratios, and directions were calculated by means of FFT in different frequencies. After that, the minimum and maximum curves were calculated at the trailer seat and handle grip positions. According to the results, the vibration acceleration of the engine in both positions was high while using pure diesel fuel (B0). Moreover, adding 8% Biodiesel to the fuel (B8) reduced the vibration acceleration of the engine transferred to the positions. Hence, less vibration is transferred to the drivers and they can drive more safely while using a diesel-biodiesel blend.