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      2. 山地果園輪式運輸機半主動懸架系統設計與試驗





        廣東省科技計劃項目(2019B020223001; 2020B090926004); 廣東省現代農業產業技術體系創新團隊-茶葉產業創新團隊設施與機械化崗位專家(2019LM119); 現代農業產業技術體系建設專項資金(CARS-26)

        Design and test of semi-active suspension system of wheeled transporter for hilly orchard

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          為解決山地果園運輸機在實際使用中因路況起伏不平而引起的劇烈振動問題,結合山地實際路面情況,設計使用CDC阻尼器的半主動懸架系統,并安裝于華南農業大學研發的丘陵山地果園電動輪式運輸機。以安裝使用CDC阻尼器的半主動懸架系統的丘陵山地果園輪式運輸機為研究對象,采用振動儀和振動傳感器搭建振動測試系統,在行駛速度和載荷一定的工況下,分別測試該輪式運輸機裝有半主動懸架前后行駛過程中座椅位置Z軸的振動信號,考察半主動懸架裝車前后的振動差異。結果顯示,裝有使用CDC阻尼器的半主動懸架的輪式運輸機振動降幅達50%,達到了半主動懸架系統的設計要求;裝有使用CDC阻尼器的半主動懸架系統的車身振動頻率集中,范圍大于8 Hz,表明車輛的駕駛舒適性較好。


          In order to solve the severe vibration problem of hilly orchard transporter in practice, a semi-active suspension system using CDC dampers was designed and the loading tests were carries out. An orchard road input model was first established as well. When using the road input model established to select a simulated road, the α is 0.9, the coefficient of corresponding road roughness is 4 096×10-6 m3, and the vehicle speed is 10 m/s. A road input model was created in MATLAB/Simulink, then the semi-active suspension and passive suspension models were established, and MATLAB was used to establish the Simulink model of the fuzzy PID controller based on the suspension system dynamics model. The parameters of the semi-active suspension were analyzed and adjusted to obtain the ideal simulation response results. The results showed that the performance of the semi-active suspension system is 10%-20% higher than that of the passive suspension system. Finally, the mechanical structure of the semi-active suspension system was designed and the loading test of the system was carried out. The mechanical structure of the semi-active suspension system is made up of elastic elements, shock absorber reformation, guiding mechanism and various parts connecting parts, and semi-active suspension. The system is arranged according to the layout space of the front axle. The shock absorbers are arranged in an oblique arrangement with a horizontal angle of 30°. The elastic elements are arranged vertically. The guide mechanism is installed in the middle of the front axle to limit the front and rear of the front axle and constrain the vertical movement trajectory. According to the fuzzy PID controller designed, the control circuit system is designed and the semi-active suspension is tested. The vibration test system is built using the vibration instrument and the vibration sensor and the vibration signal of the Z axis of the seat position of the vehicle is tested during driving. Under certain conditions of speed and load, the test results of the semi-active suspension before and after loading showed that the vibration reduction of the transporter equipped with the semi-active suspension reached 50%, meeting the design requirements of the semi-active suspension system. The vibration frequency range of the vehicle body equipped with a semi-active suspension system is greater than 8 Hz, indicating that the vehicle has good driving comfort. Although this paper has done a certain theoretical analysis on designing the semi-active suspension system of the wheeled transporter for hilly orchard, there are still many things that can be further studied and expanded. For example, neural network or genetic algorithm can be used to optimize the fuzzy PID controller so that it can respond better to road excitation. When the system is in motion simulation, Adams can be used to perform kinematics simulation analysis, analyze the mechanical performance of the system in motion, and optimize its design.



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        • 在線發布日期: 2020-12-01
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