水稻整株秸秆还田机刀轴可靠性灵敏度分析及优化

为使1ZT-210型水稻整株秸秆还田机刀轴的设计更趋合理，充分考虑设计中的模糊因素，通过模糊综合评判确定刀轴的壁厚；建立了影响刀轴功能的各随机变量的可靠性灵敏度矩阵，通过编写计算机程序得到各设计因素对于刀轴可靠性的灵敏度设计信息。依据灵敏度分析结果，选取可靠性设计参数，刀轴截面较常规设计减小39.17%。数值算例表明，计算结果与通常的定性分析结果完全一致，验证了本方法的有效性。田间试验表明，可靠性灵敏度设计使刀轴的寿命增加560 h，埋草率提高到95%。

Optimization and reliability sensitivity analysis for cutter shaft of whole rice straw returning machine

In order to rationalize the design of the straw-mulching cutter shaft of the whole straw-returning machine (Model: 1ZT-210), fuzzy factors in the design were fully considered, and the wall thickness of the cutter shaft was obtained by fuzzy comprehensive evaluation; and the reliability sensitivity matrix of the random variables effecting the cutter shaft's function was established. The design information of the reliability sensitivity of the cutter shaft was obtained by the computer programming. Based on the results of sensitivity analysis, extract reliability design parameters were selected, then the cross-sectional area of the cutter shaft was reduced by 39.17% compared with conventional design. A numerical example demonstrates that the result of presented method is accord with the qualitative analysis; the proposed method is efficient and accurate. The results of the field experiment manifest that the reliability sensitivity design makes the life of cutter shaft increase 560 hours, and the pass rate of weed buried raises to 95%.