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4LL-1.5Y型履带式油菜联合收获机割台振动分析
马丽娜,魏俊逸,黄小毛,宗望远,詹广超
0
(华中农业与大学工学院,武汉 430070; 农业部长江中下游农业装备重点实验室,武汉 430070)
摘要:
针对油菜联合收获机振动剧烈,整机稳定性、工作可靠性和驾驶舒适性较差等问题,以4LL-1.5Y型履带式油菜联合收获机的割台为研究对象,在道路运输(仅发动机工作)、道路运输(发动机与工作部件同时工作)以及田间收获作业 3 种典型工况下,在割台上选择3个测点,利用DHDAS动态信号采集分析系统对油菜联合收获机割台振动进行了测试,并基于时域分析、小波分析和频域分析对试验数据进行了处理。研究表明:发动机、拨禾轮、割刀的振动是整机主要激振源,但作物喂入割台后,吸收了部分振动,使得拨禾轮和割刀的振动总量分别下降了23.5%和68.7%;振动信号主要集中在0~125 Hz内,油菜联合收获机割台上各激振力的激振频率以低频为主;油菜联合收获机工作时发动机引起的一阶惯性振动频率为29.18 Hz;研究结果对提高油菜联合收获机工作的可靠性、降低收获损失、减轻驾驶员的疲劳具有重要意义。
关键词:  油菜联合收获机  振动测试  时域分析  小波包变换  频域分析
DOI:10.13610/j.cnki.1672-352x.20191013.013
基金项目:国家自然科学基金(51805198)资助。
Vibration analysis of cutting table of 4LL-1.5Y crawler rape combine harvester
MA Lina,WEI Junyi,HUANG Xiaomao,ZONG Wangyuan,ZHAN Guangchao
(College of Engineering, Huazhong Agriculture University, Wuhan 430070; Key Laboratory of Agriculture Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan 430070)
Abstract:
To deal with severe vibration, and poor stability, reliability and driving comfort of rape combine harvesters, the vibration of the cutting table on a 4LL-1.5Y crawler rape combine harvester was studied. Three measuring points were placed on the cutting table and tests were conducted under three typical working conditions: road transportation (engine working only), road transportation (engine and harvesting parts working simultaneously) and field harvesting operation. The vibration of the cutting table was tested by DHDAS dynamic signal acquisition and analysis system, and the experimental data were processed based on time domain analysis, wavelet analysis and frequency domain analysis. The results show that the vibration of the engine, pulley and cutter is the main exciting source of the whole machine, but the vibration of the pulley and cutter is partially absorbed after the crop is fed into the cutting table, which reduces the total vibration of the pulley and cutter by 23.5% and 68.7% respectively. The vibration signals are mainly in the range of 0-125 Hz, and the excitation frequencies of the exciting forces on the cutting table are mainly in the low-frequency range. The first-order inertial vibration frequency caused by the engine is 29.18 Hz when the rape combine harvester is working. The results of the study are significant for improving the reliability of the rape combine harvester, reducing harvesting losses and alleviating fatigue of the operator.
Key words:  rape combine harvester  vibration test  time domain analysis  wavelet packet transform  frequency domain analysis

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