全馈式水稻联合收割机头部振动分析及拓扑优化

IF 2.2 2区 农林科学 Q2 AGRICULTURAL ENGINEERING International Journal of Agricultural and Biological Engineering Pub Date : 2023-01-01 DOI:10.25165/j.ijabe.20231604.7096
Han Tang, Changsu Xu, Jianhua Zhu, Rui Guan, Jinwu Wang
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引用次数: 0

摘要

全馈式水稻联合收割机机头机架由于各工作部件运动产生的激振力而产生剧烈振动。为解决这一问题,建立了箱梁框架的参数化模型,并通过基于特征系统实现算法(ERA)的自由模态分析和自由振动模态试验结果的对比,验证了有限元模型的准确性。计算了约束模态频率,并与外部激励源频率进行了比较,结果表明,一阶和八阶模态固有频率分别与脱粒缸和发动机的激励频率耦合,易于发生共振。为了避免共振和实现轻量化设计,进行了拓扑优化和有限元分析。优化结果表明,强度和刚度均满足要求,重量比优化前降低14.17%。一阶和八阶模态固有频率远离脱粒缸和发动机的激励频率范围,且远离各激励频率范围,有效避免了共振的发生。现场试验表明,优化后的头框8个测点在3个方向上的振动加速度峰值明显减小,有效地降低了收获过程中头框的振动。本研究为获取农业机械关键部件的振动特性提供了一种方法,为水稻、小麦、油菜等作物联合收割机的头框减重减振提供了参考。关键词:特征系统实现算法,模态分析,自由模态试验,拓扑优化,轻量化,田间试验DOI: 10.25165/ j.j ijabe.20231604.7096引用本文:唐辉,徐春生,朱建华,关锐,王建文。全饲型水稻联合收割机收箱振动分析与拓扑优化。农业与生物工程学报,2023;16(4): 96 - 108。
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Vibration analysis and topology optimization of the header of full-feeding rice combine harvester
The header frame of full-feeding rice combine harvester was characterized by severe vibration due to the excitation force generated by the movement of each working part. In order to solve the problem, the parametric model of header frame was established, and the accuracy of the finite element model was verified by comparison the results of the free modal analysis and free vibration modal test based on Eigensystem Realization Algorithm (ERA). Then the constrained modal frequencies were calculated and compared with the external excitation source frequencies, the results showed that the first and eighth order modal natural frequencies were coupled with the excitation frequencies of the threshing cylinder and the engine respectively, which was apt to resonate. To avoid resonance and achieve lightweight design, topology optimization and the finite element analysis was carried out. The optimization results showed that the strength and rigidity meet the requirements and the weight was 14.17% lower than before. The first and eighth order modal natural frequencies were far away from the excitation frequencies range of threshing cylinder and engine, and the frequencies were far away from the range of each excitation frequency, which effectively avoided the occurrence of resonance. Field experiments showed that the peak value of the vibration acceleration in the three directions of the 8 measuring points of the optimized header frame was significantly reduced, which effectively reduced the vibration of the header frame during harvest. This study provides a method for obtaining the vibration characteristics of key components of agricultural machinery, and provides a reference for the weight and vibration reduction of header frame of rice, wheat, rape and other crop combine harvesters. Keywords: eigensystem realization algorithm, modal analysis, free modal test, topology optimization, lightweight, field experiment DOI: 10.25165/j.ijabe.20231604.7096 Citation: Tang H, Xu C S, Zhu J H, Guan R, Wang J W. Vibration analysis and topology optimization of the header of full-feeding rice combine harvester. Int J Agric & Biol Eng, 2023; 16(4): 96-108.
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来源期刊
CiteScore
4.30
自引率
12.50%
发文量
88
审稿时长
24 weeks
期刊介绍: International Journal of Agricultural and Biological Engineering (IJABE, https://www.ijabe.org) is a peer reviewed open access international journal. IJABE, started in 2008, is a joint publication co-sponsored by US-based Association of Agricultural, Biological and Food Engineers (AOCABFE) and China-based Chinese Society of Agricultural Engineering (CSAE). The ISSN 1934-6344 and eISSN 1934-6352 numbers for both print and online IJABE have been registered in US. Now, Int. J. Agric. & Biol. Eng (IJABE) is published in both online and print version by Chinese Academy of Agricultural Engineering.
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