基于组合近似模型的分体式插秧机秧箱轻量化设计

Lightweight designs of split seedling box of rice transplanter based on ensemble approximate model

为了解决插秧机秧箱质量过重影响机器工作稳定性和作业质量等问题,以可调行距高速插秧机分体式秧箱为研究对象,建立其有限元模型,对秧箱进行了静动态性能分析。根据有限元分析结果,采用最优拉丁超立方试验设计和组合近似模型相结合的优化设计方法,以刚度和模态作为约束条件,以质量作为优化目标,建立轻量化设计的数学模型,采用粒子群优化算法进行了求解。优化结果显示,秧箱质量由优化前的14.6 kg下降到13.2 kg,减轻了9.59%。根据轻量化设计结果对秧箱进行了结构改进,并进行了仿真验证,结果表明改进后的秧箱刚度分布更加均匀,弯曲刚度、扭转刚度和一阶固有频率等性能指标均有不同程度的提高,为轻量化秧箱产品研发提供了理论依据。

In order to solve the problem of the effect of heavy weight on the stability and working quality of the machine, a static and dynamic performance analysis based on the establishment of finite element mode on split seedling box of adjustable row spacing high speed transplanter was carried out. According to the results of finite element analysis, a mathematical model of lightweight design was established with stiffness and mode as constraints, quality as the optimization goal by using the combined method of optimal Latin hypercube design and ensemble approximate model, which was solved by particle swarm optimization algorithm. The optimization results indicated that the quality of the seedling box decreased by 9.59% from 14.6 kg to 13.2 kg. According to the optimal results, the structure of the seedling box was improved and the simulation verification was carried out. Simulation results showed that not only the stiffness distribution of improved seedling box is more uniform, but also the bending stiffness, torsional stiffness and the first order natural frequency are improved to some extent, which provides a theoretical basis for the research and development of lightweight seedling box.