For grain combine harversters the correlation between cutting frequency and forward speed is typically based on the theoretical matching value of the cutting pattern. However, in reality cutting frequency is affected by cutting resistance which strongly linked to the physical and mechanical characteristics of the crop stems. Consequently, the field cutting frequency is usually lower the standard setting, resulting in the possibility of increasing losses during harvesting. An optimal cutting frequency model was built firstly based on the cutting pattern but the influencing factors on cutting frequency was analysed, and then a relationship model between cutting energy and cutting frequency was built. A regression model of the influence of wheat stem moisture content and cutting section area on cutting frequency was established by wheat stem cutting experiments. Thus, a cutting frequency compensation control strategy was proposed. To verify the effectiveness of the control strategy, field tests were carried out on uniformly growing wheat fields. The results showed that at the forward speeds of 1 m s⁻¹ and 1.5 m s⁻¹, the maximum deviation between the cutting frequency determined by this proposed approach and the optimal cutting frequency were 0.47 Hz and 1.1 Hz, respectively. Comparing performance without this compensation model, the maximum deviation of the cutting frequency without compensation decreased by 28.33% and 24.60%, respectively. The results indicated that with the proposed approach, the maximum deviation between the field cutting frequency and the predicted optimal cutting frequency could be significantly decreased and the cutting performance of the combine harvester could be observably improved.

对于谷物联合收割机，切割频率与前进速度之间的相关性通常基于切割模式的理论匹配值。但是，实际上，切割频率受切割阻力的影响，而切割阻力与农作物茎的物理和机械特性密切相关。因此，田间切割的频率通常低于标准设置，导致收获期间损失增加的可能性。首先根据切削方式建立了最佳切削频率模型，分析了切削频率的影响因素，然后建立了切削能量与切削频率的关系模型。通过小麦茎秆cutting插试验，建立了小麦茎秆含水量和cutting插面积对切削频率影响的回归模型。因此，提出了切削频率补偿控制策略。为了验证控制策略的有效性，对均匀生长的麦田进行了田间试验。结果表明，在1 m s的前进速度下^-1和1.5 m s ^-1，该方法确定的切割频率与最佳切割频率之间的最大偏差分别为0.47 Hz和1.1 Hz。比较没有此补偿模型的性能，没有补偿的切削频率的最大偏差分别降低了28.33％和24.60％。结果表明，所提出的方法可以大大降低田间切割频率与预测的最佳切割频率之间的最大偏差，并可以明显提高联合收割机的切割性能。