Frequency Matching Method and Experiment of Variable Stiffness Vibration Energy Feedback Device for Electric Tractor
Abstract
In allusion to the efficient vibration energy recovery problem of a wheeled electric tractor, a variable stiffness spring was innovatively integrates into the research team’s existing vibration energy feedback device and a method was proposed to match the device’s resonance frequency with the road surface excitation frequency, thereby improving energy capture performance. Firstly, the range of road excitation frequency was analyzed based on the road grade and vehicle speed of the electric tractor. Subsequently, a nonlinear 10-degree-of-freedom dynamic model of the variable stiffness vibration energy feedback device was formulated. With the QR decomposition, implicit restart Arnoldi method (IRAM) and adaptive cross approximation algorithm (ACA), the modal frequencies of the device were solved, and the modal evolution law was analyzed by combining these methods with the finite element method. On this basis, the stiffness coefficient of variable stiffness spring was determined, and the frequency matching method for the variable stiffness vibration energy feedback device was proposed. Finally, fixed-frequency and swept-frequency bench tests were conducted to compare the energy capture performance of the fixed and variable stiffness vibration energy feedback devices. The results demonstrated that the variable stiffness spring structure significantly broadened the resonance band of the device, increased the maximum instantaneous output voltage to 52.2V, and boosted the average output power and electricity generation by 34.4% and 42.8%, respectively，at the same time, it met the vibration reduction requirement for the battery pack. The above research can provide theoretical and technical support for the power supply of electric tractors and it was of great significance to promote the development of its energy-saving technology.
Keywords: electric tractor;variable stiffness;frequency matching;vibration energy capture
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HUANG Bin, KONG Xiangzhi. New quality agricultural productive forces empower farmers income: theoretical mechanism and practical path [J ]. Journal of China Agricultural University ( Social Sciences) , 2025 ,42 ; 1 - 13. (in Chinese)
XU Liyou, ZHANG Junjiang, YAN Xianghai, et al. Review of research for agricultural equipment electrification technology [J ] . Transactions of the Chinese Society for Agricultural Machinery, 2023,54(9) :1 - 12. (in Chinese)
LI Liqiao, GAO Zongyu, NIE Jing. Load-adaptive energy management strategy for electric tractor based on hybrid power source [J] . Transactions of the Chinese Society for Agricultural Machinery, 2024,55(9) ;459 -469. ( in Chinese)
LUO H Z, XIE В, TONG К Y, et al. Energy-saving drive control strategy for electric tractors based on terrain parameter identification [ J ]. Applied Energy ,2024 ,376 ; 124230.
SHI Huirong, ZUO Cunsheng, GAO Quanfu. Combined resonance analysis of a servo piezoelectric-magnetic coupled energy harvester [J]. Journal of Vibration and Shock, 2024,43(3) ;209 -217,226. (in Chinese)
JIN F Y, ZANG С P, XING G P, et al. Resonant peak reduction of a rotor system based on gradually variable stiffness of supports with shape memory alloy springs[ J ]. Journal of Sound and Vibration ,2024 ,591 :118626.
WANG X D, WANG Q, WANG W, et al. Performance investigation of piezoelectric-mechanical electromagnetic compound vibration energy harvester for electric tractor[ J ]. Energy ,2023 ,281 :128285.
WANG Ruochen, JIAO Yu, QIAN Jingang, et al. Design and experiment on semi-active controller for hybrid suspension[ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2017,48(6) :334 -340. (in Chinese)
WU Yipeng, LI Sen, LAN Chunbo, et al. Recent development of piezoelectric energy harvesting structures and the technology of frequency up-converting oscillators [ J ]. Journal of Mechanical Engineering, 2022,58(20) ;27 -45. (in Chinese)
ZHOU Kuntao, YANG Tao, GE Gen, et al. Study on the steady state statistical characteristics of variable-section piezoelectric cantilever energy harvester under Gaussian white noise excitation [ J ]. Journal of Vibration Engineering, 2024,37(5) ;864 - 874. ( in Chinese)
LAI Z H, XU J С, FANG S T, et al. Energy harvesting from a hybrid piezo-dielectric vibration energy harvester with a self-priming circuit [ J]. Energy ,2023 ,273 :127205.
GAO Yanhui. Theoretical and finite element simulation researc h on piezoelectric energy harvester of cantilever beam with variable stiffness [ D ]. Beijing: Beijing University of Technology ,2019. (in Chinese)
YANG T, HUANG Z, XIE J, et al. Dynamic analysis and energy harvesting of double nonlinear stiffness vibration isolator [J ] . Engineering Structures ,2025 ,332 ; 120028.
WEI Yongxiang. Design of nonlinear electromagnetic energy harvester for low-frequency and broadband vibration [ D], Changsha: Hunan University of Technology ,2023. (in Chinese)
MINA G, GHADER R, VAHID M. A wide-bandwidth MEMS energy harvester based on a novel voltage-sliding stiffness tunability [ J ]. Applied Mathematical Modelling,2024 ,125 :16 - 34.
SHEN J W, WAN S, FU J D, et al. A magnetic plucking frequency up-conversion piezoelectric energy harvester with nonlinear energy sink structure [ J ]. Applied Energy, 2024,376:124326.
CAO Yongyong. Nonlinear dynamic characteristics and mechanism investigation of rotational motion energy harvesting [ D ]. Beijing: University of Science and Technology Beijing,2023. (in Chinese)
LUO Feng, YANG Zhongjiong, ZHOU Liqiang. Effects of variable pitch spring on ride comfort of formula student racings [J] . China Mechanical Engineering,2017 ,28(24) :2971 -2975. (in Chinese)
CHEN Xiaoliang. A composite adaptive fuzzy control of semi-active seat suspension for large tractors [D]. Luoyang: Henan University of Science and Technology ,2023.
YAN Jianguo. Study on vibration characteristics of tractor based on excitation of agriculture terrain roughness [ D ]. Hohhot: Inner Mongolia Agricultural University,2020. (in Chinese)
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