Lightweight design of greenhouse frame structure considering mechanical load and thermal load

doi:10.13733/j.jcam.issn.2095-5553.2024.06.013

Abstract

Abstract:

In order to explore the influence of temperature change on the safety of greenhouse skeleton structure, an optimal design model of greenhouse skeleton thermoelastic structure considering mechanical load and thermal load was established. With the goal of minimizing the maximum stress value of the structure under mechanical load and thermal load, and choosing the total material consumption of the structure as the constraint, the stress distribution under the combined action of mechanical load and thermal load was considered to achieve the optimal design of the continuum structure of the greenhouse framework, so that the structure could minimize the stress concentration of the structure under the premise of meeting the support stiffness. Considering the design dependency and intermediate variables in the thermal stress optimization problem, the density filter function was used to obtain a clear optimal topology. Through two typical greenhouse frame optimization examples, the maximum equivalent stress of the optimized structure under different temperature changes and material consumption was compared. The results showed that the maximum equivalent stress optimization efficiency of the model could reach about 15% under the same volume fraction. Under the same load conditions, increasing the volume ratio by 0.1 could achieve an increase of nearly 1% in the maximum equivalent stress optimization effect of the structure. The obtained conceptual design scheme of the greenhouse skeleton structure has guiding significance for the design of the greenhouse skeleton structure in engineering applications.

Key words: greenhouse structure, topology optimization, thermoelastic structure, stress

摘要：

为探究温度变化对温室大棚骨架结构安全性的影响，建立考虑机械载荷和热载荷的大棚骨架热弹性结构优化设计模型。以机械载荷和热载荷下结构的最大应力值最小化为目标，以结构的总材料用量为约束，考虑机械载荷与热载荷联合作用下的应力分布，实现对大棚骨架的连续体结构优化设计,使结构在满足支撑刚度的前提下最大程度缓和结构的应力集中问题。考虑到热应力优化问题中的设计依赖性和中间变量问题，采用密度过滤函数获得清晰的最优拓扑构型。通过两种典型温室大棚骨架优化算例，对比不同温度变化幅度和不同材料用量下优化结构的最大等效应力，结果表明：该模型在相同体积比下结构最大等效应力优化效率最高可达到约15%，同种载荷条件下体积比增加0.1可实现结构最大等效应力优化效果提高近1%。该研究为考虑机械载荷和热载荷的大棚骨架热弹性结构优化设计提供有效的设计方法，对工程应用中的温室大棚骨架结构设计具有指导意义。

关键词: 温室结构, 拓扑优化, 热弹性结构, 应力

CLC Number:

S625.1

Fan Jian, , Yi Zhenfeng, , Yao Xingzhi, , Xie Jinpeng, Tan Wenchao, , Wang Yu, . Lightweight design of greenhouse frame structure considering mechanical load and thermal load[J]. Journal of Chinese Agricultural Mechanization, 2024, 45(6): 77-81.

凡健, , 易振峰, , 姚兴智, , 谢锦鹏, 谭文超, , 王昱, . 考虑机械载荷和热载荷的温室大棚骨架结构轻量化设计[J]. 中国农机化学报, 2024, 45(6): 77-81.

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