| Summary: | 碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 102 === The agricultural transporter is one kind of agricultural machinery successfully developed and made by local manufacturers. Its major function is to carry farm crops, goods, and products. Due to its great adaptability to terrain, it is very popular with farmers. Moreover, it undoubtedly reduces the human labor in agriculture tasks.
In recent years, there have been dramatic changes to our agricultural environment. The performance of agricultural machinery has improved considerably, and the power and carrying capacity requirements of agricultural transporters are not the same as before. Due to the demand of the market, agricultural transporters with high working capacity have been successfully developed and manufactured. However, whether these new types of agricultural transporter are really safe will become a significant issue.
In this study, a Computer-Aided Engineering software named ADAMS is used as a research tool. By means of ADAMS, a multi-body system model of an agricultural transporter can be built to simulate its motion. The relevant vehicle specifications are provided by local manufacturers. In the simulation, the maximum speed of the vehicle is limited to 20 km/h. The power of the engine is classified as 19hp / 21.5hp / 23hp to obtain the dynamic simulation, and the capacity of the loading platform is grouped into 1200kg / 2400kg / 3600kg. Moreover, various simulated roads are selected. The simulation parameters include braking distance, minimum turning radius, and tests in even/sloping fields, which are according to the regulation of the Performance Test of Agricultural Transporters. Therefore, we can observe the results after the simulation and compare these with real field tests.
The results from the simulation show the weight of loading greatly affects braking distance. Agricultural transporters without loading and loading with 1200kg and 2400kg on platform can meet the requirement of the regulation of the Performance Test of Agricultural Transporters. Only in the situation of a loading weight over 3600kg, will it exceed the specified value. Further, the minimum turning radius is in the range of 6.41 to 6.50 meters from the simulation, meaning the turning performance is acceptable. For the simulation of the sloping field test, the vehicle can halt on a 15-degree ramp and the center of gravity of the vehicle remains stable without slippage. Besides, the transporter can restart again smoothly. In conclusion, the simulated tests show the safety performance of an agricultural transporter with high carrying capacity and a high-powered engine can still meet the requirements of the regulation of the Performance Test of Agricultural Transporters. In addition, when this transporter operates on even ground, a sloping field or rugged road, the chance of rollover is almost nil.
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