Analysis and evaluation of vibration characteristics of a new type of electric mini-tiller based on vibration test
Keywords:
electric mini-tiller, vibration characteristics, time domain analysis, frequency domain analysis, hand transmitted vibrationAbstract
Now the internal combustion engine mini-tiller has become the main and indispensable agricultural machinery in vast hilly and mountainous areas of Southwest China. However, its intense vibration may pose a big threat to operators. As a countermeasure to the tiller vibration, a new type of electric mini-tiller powered with a group of lithium battery and a brushless DC motor was developed. The vibration signals at the handle of the tiller were tested under 6 conditions as follows: the tiller was under states of static and working in the field, at slow, medium and rapid speed, respectively. The signals were processed by means of the time domain eigenvalue analysis and the frequency spectrum analysis. The results show that with the electric motor rated speed increased from 95 to 140 r/min under static conditions, the RMS values increased 122.54%, and with the forward speed increased from 0.30 to 0.80 m/s under working conditions, the RMS values increased 201.78%. When the tiller was working, the first order vibration frequencies were 25.99 Hz, 26.99 Hz and 28.99 Hz at slow, medium and rapid speed respectively, all not within 37.50-65.00 Hz, the sensitive range of human hands to the vibration frequency. In addition, according to the results of hand transmitted vibration analysis, it can be found that compared with operating the internal combustion engine mini-tiller under the same working condition, the onset of vibration-induced white finger can be delayed for 3.70 years to 10.20 years by operation of the new electric tiller. Keywords: electric mini-tiller, vibration characteristics, time domain analysis, frequency domain analysis, hand transmitted vibration DOI: 10.25165/j.ijabe.20191205.4737 Citation: Niu P, Chen J, Zhao J D, Luo Z Y. Analysis and evaluation of vibration characteristics of a new type of electric mini-tiller based on vibration test. Int J Agric & Biol Eng, 2019; 12(5): 106–110.References
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[3] Ahmadian H, Hassan-Beygi R, Ghobadian B. Determination of a power tiller vibration acceleration envelope curves on transportation mode. International Conference on Mechanical Engineering and Advanced Technology, ICMEAT, 2012.
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[8] Xu L Z, Chai X Y, Gao Z P, Li Y M, Wang Y D. Experimental study on driver seat vibration characteristics of crawler-type combine harvester. Int J Agric & Biol Eng, 2019; 12(2): 90–97.
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[11] Thomas H L, Morten K E, Ario K. Experimental analysis of occupational whole-body vibration exposure of agricultural tractor with large square baler. International Journal of Industrial Ergonomics, 2015; 47: 79–83.
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[13] Sam B, Kathirvel K. Development and evaluation of vibration isolators for reducing hand transmitted vibration of walking and riding type power tillers. Biosystems Engineering, 2009; 103(4): 427–437.
[14] Kalra M, Rakheja S, Marcotte P, Dewangan K N, Adewusi S. Measurement of coupling forces at the power tool handle-hand interface. International Journal of Industrial Ergonomics, 2015; 50: 105–120.
[15] Liang X C, Chen J, Wang Z. Research on the vibration of mini-tiller. INMATEH-Agricultural Engineering, 2018; 56(3): 17–24.
[16] Bini S, Kathirvel K. Vibration characteristics of walking and riding type power tillers. Biosystems Engineering, 2006; 95(4): 517–528.
[17] Tewari V K, Dewangan K N. Effect of vibration isolators in reduction of workstress during field operation of hand tractor. Biosystems Engineering, 2009; 103(4): 146–158.
[18] Cai K, Zhang J L, Ke X R, Deng J Z, He D Q, Zhong B H. Research on the control system of dual-driven electric rotary tiller. Guangdong Agricultural Sciences, 2013; 14: 179–181. (in Chinese)
[19] Gao H S, Zhu S H, Shi J K, Yang J H, Xu X L, Chang Y L, Chen Y. Development of electric micro-farming machines for green-houses. Journal of Machine Design, 2012; 29(11): 83–87. (in Chinese)
[20] Li L, Lu C, Dai M L, Yang L, Zhao W. The design and research of new environmental motor-driven micro rotary tiller. Journal of Yancheng Institute of Technology: Natural Science Edition, 2017; 37(3): 9–13. (in Chinese)
[21] ISO 5349-a. Mechanical vibration- measurement and evaluation of human exposure to hand transmitted vibration, part 1: general requirements, Geneva, Switzerland, 2001.
[22] ISO 5349-b. Mechanical vibration- measurement and evaluation of human exposure to hand transmitted vibration, part 2: practical guidance for measurement at workplace, Geneva, Switzerland, 2001.
[23] Yang J, Meng X W. Study on vibration mechanism and measures for vibration reducing to the handle of cultivator by virtual prototype technology. Transactions of the CSAM, 2005; 36(2): 39–42. (in Chinese)
[24] Li G, Chen J, Xie H J, Wang S M. Vibration test and analysis of mini-tiller. Int J Agric & Biol Eng, 2016; 9(3): 97–103.
[25] Wen B C, Liu S Y. Mechanical vibration theory and dynamic design method. Mechanical Industry Press, China, 2002.
[26] Ragni L, Vassalini G, Xu F, Zhang L B. Vibration and noise of small implements for soil tillage. J. Agric. Engng Res, 1999; 74(4): 403–409.
[2] Rabbani M A, Tsujimoto T, Mitsuoka M, Inoueb E, Okayasub T. Prediction of the vibration characteristics of half-track tractor considering a three-dimensional dynamic model. Biosystem Engineering, 2011; 110(2): 178–188.
[3] Ahmadian H, Hassan-Beygi R, Ghobadian B. Determination of a power tiller vibration acceleration envelope curves on transportation mode. International Conference on Mechanical Engineering and Advanced Technology, ICMEAT, 2012.
[4] Kabir Md S N, Chung S-O, Kim Y-J, Sung N-S, Hong S-J. Measurement and evaluation of whole body vibration of agricultural tractor operator. Int J Agric & Biol Eng, 2017; 10(1): 248–255.
[5] Wang Y X, Osman A N, Zhang D X, Yang L, Cui T, Zhong X J. Optimized design and field experiment of a staggered vibrating subsoiler for conservation tillage. Journal of Vibration and Shock, 2019; 12(1): 59–65.
[6] Niu P, Yang M J, Chen J, Yang L, Xie S Y, Chen X B. Structural optimization of handrail of a handheld tiller by vibration modal analysis. INMATEH-Agricultural Engineering, 2017; 52(2): 91–98.
[7] Fabbri A, Cevoli C, Cantalupo G. A method for handlebars ballast calculation in order to reduce vibration transmissibility in walk behind tractors. Journal of Agricultural Engineering, 2017; 48(2): 81–87.
[8] Xu L Z, Chai X Y, Gao Z P, Li Y M, Wang Y D. Experimental study on driver seat vibration characteristics of crawler-type combine harvester. Int J Agric & Biol Eng, 2019; 12(2): 90–97.
[9] Griffin M J. Measurement, evaluation, and assessment of peripheral neurological disorders caused by hand-transmitted vibration. International Archives of Occupational and Environmental Health, 2008; 81: 559–573.
[10] Xu G, Zhu S H, Nie X T, He L, Li K. Natural frequencies calculation for vibrating systems of tractors made in China. Journal of Vibration and Shock, 2014; 33(15): 157–161.
[11] Thomas H L, Morten K E, Ario K. Experimental analysis of occupational whole-body vibration exposure of agricultural tractor with large square baler. International Journal of Industrial Ergonomics, 2015; 47: 79–83.
[12] Dewangan K N, Tewari V K. Vibration energy absorption in the hand-arm system of hand tractor operator. Biosystems Engineering, 2009; 103(4): 445–454.
[13] Sam B, Kathirvel K. Development and evaluation of vibration isolators for reducing hand transmitted vibration of walking and riding type power tillers. Biosystems Engineering, 2009; 103(4): 427–437.
[14] Kalra M, Rakheja S, Marcotte P, Dewangan K N, Adewusi S. Measurement of coupling forces at the power tool handle-hand interface. International Journal of Industrial Ergonomics, 2015; 50: 105–120.
[15] Liang X C, Chen J, Wang Z. Research on the vibration of mini-tiller. INMATEH-Agricultural Engineering, 2018; 56(3): 17–24.
[16] Bini S, Kathirvel K. Vibration characteristics of walking and riding type power tillers. Biosystems Engineering, 2006; 95(4): 517–528.
[17] Tewari V K, Dewangan K N. Effect of vibration isolators in reduction of workstress during field operation of hand tractor. Biosystems Engineering, 2009; 103(4): 146–158.
[18] Cai K, Zhang J L, Ke X R, Deng J Z, He D Q, Zhong B H. Research on the control system of dual-driven electric rotary tiller. Guangdong Agricultural Sciences, 2013; 14: 179–181. (in Chinese)
[19] Gao H S, Zhu S H, Shi J K, Yang J H, Xu X L, Chang Y L, Chen Y. Development of electric micro-farming machines for green-houses. Journal of Machine Design, 2012; 29(11): 83–87. (in Chinese)
[20] Li L, Lu C, Dai M L, Yang L, Zhao W. The design and research of new environmental motor-driven micro rotary tiller. Journal of Yancheng Institute of Technology: Natural Science Edition, 2017; 37(3): 9–13. (in Chinese)
[21] ISO 5349-a. Mechanical vibration- measurement and evaluation of human exposure to hand transmitted vibration, part 1: general requirements, Geneva, Switzerland, 2001.
[22] ISO 5349-b. Mechanical vibration- measurement and evaluation of human exposure to hand transmitted vibration, part 2: practical guidance for measurement at workplace, Geneva, Switzerland, 2001.
[23] Yang J, Meng X W. Study on vibration mechanism and measures for vibration reducing to the handle of cultivator by virtual prototype technology. Transactions of the CSAM, 2005; 36(2): 39–42. (in Chinese)
[24] Li G, Chen J, Xie H J, Wang S M. Vibration test and analysis of mini-tiller. Int J Agric & Biol Eng, 2016; 9(3): 97–103.
[25] Wen B C, Liu S Y. Mechanical vibration theory and dynamic design method. Mechanical Industry Press, China, 2002.
[26] Ragni L, Vassalini G, Xu F, Zhang L B. Vibration and noise of small implements for soil tillage. J. Agric. Engng Res, 1999; 74(4): 403–409.
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Published
2019-10-14
How to Cite
Niu, P., Chen, J., Zhao, J., & Luo, Z. (2019). Analysis and evaluation of vibration characteristics of a new type of electric mini-tiller based on vibration test. International Journal of Agricultural and Biological Engineering, 12(5), 106–110. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/4737
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Power and Machinery Systems
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