Accelerated structural tests can evaluate the fatigue life of tractors and reduce the development costs and test time. An indoor test bench has great potential for carrying out fatigue tests due to its simple control, anti-interference and high repeatability. For the unreasonable design and insufficient damage correlation of the tractor indoor durability test, a method for designing tractor accelerated structure tests suitable for a drum-type test bench was developed. Taking the construction of optimisation matrix for accelerated structural test design as its core, the time-domain extrapolation method based on peak-over-threshold model, the augmented Lagrangian multiplier method for solving the optimal matrix and the Monte Carlo method for sensitivity analysis were combined. Field conditions and 23 simulated working conditions based on a four-wheel drum test bench were carried out, and the tractor field loads and simulated test loads had high consistency in the amplitude and frequency domains. The results show that the optimal repetitions required for the ten critical simulated working conditions were 0, 0, 0, 350, 0, 0, 531, 1031, 86 and 0 respectively. The combined test total duration was only 34 h, the acceleration coefficient was 12.6 and the average relative error of damage was only 14.56%. Compared with the results of Monte Carlo method, the errors of the optimal repetition times of the simulated working conditions were less than 5%, which verifies the accuracy, rationality and effectiveness of the design method of tractor durability accelerated structure test.

加速的结构测试可以评估拖拉机的疲劳寿命，并减少开发成本和测试时间。室内试验台具有简单的控制，抗干扰性和高重复性，因此具有进行疲劳试验的巨大潜力。针对拖拉机室内耐久性试验设计不合理，损伤相关性不足的问题，提出了一种适用于鼓式试验台的拖拉机加速结构试验设计方法。以加速结构试验设计优化矩阵的构建为核心，结合基于阈值峰值模型的时域外推法，求解最优矩阵的增强拉格朗日乘子法和敏感性分析的蒙特卡洛法相结合。在四轮鼓试验台的基础上进行了田间条件和23种模拟工作条件，拖拉机的田间载荷和模拟试验载荷在幅度和频域上具有较高的一致性。结果表明，十个关键模拟工作条件所需的最佳重复分别为0、0、0、350、0、0、531、1031、86和0。组合测试的总持续时间仅为34 h，加速系数为12.6，平均损坏相对误差仅为14.56％。与蒙特卡罗方法的结果相比，模拟工况下最佳重复次数的误差小于5％，验证了拖拉机耐久性加速结构试验设计方法的准确性，合理性和有效性。拖拉机的现场载荷和模拟试验载荷在振幅和频率域上具有较高的一致性。结果表明，十个关键模拟工作条件所需的最佳重复分别为0、0、0、350、0、0、531、1031、86和0。组合测试的总持续时间仅为34 h，加速系数为12.6，平均损坏相对误差仅为14.56％。与蒙特卡罗方法的结果相比，模拟工况的最佳重复次数误差小于5％，验证了拖拉机耐久性加速结构试验设计方法的准确性，合理性和有效性。拖拉机的现场载荷和模拟试验载荷在振幅和频率域上具有较高的一致性。结果表明，十个关键模拟工作条件所需的最佳重复分别为0、0、0、350、0、0、531、1031、86和0。组合测试的总持续时间仅为34 h，加速系数为12.6，平均损坏相对误差仅为14.56％。与蒙特卡罗方法的结果相比，模拟工况下最佳重复次数的误差小于5％，验证了拖拉机耐久性加速结构试验设计方法的准确性，合理性和有效性。结果表明，十个关键模拟工作条件所需的最佳重复分别为0、0、0、350、0、0、531、1031、86和0。组合测试的总持续时间仅为34 h，加速系数为12.6，平均损坏相对误差仅为14.56％。与蒙特卡罗方法的结果相比，模拟工况下最佳重复次数的误差小于5％，验证了拖拉机耐久性加速结构试验设计方法的准确性，合理性和有效性。结果表明，十个关键模拟工作条件所需的最佳重复分别为0、0、0、350、0、0、531、1031、86和0。组合测试的总持续时间仅为34 h，加速系数为12.6，平均损坏相对误差仅为14.56％。与蒙特卡罗方法的结果相比，模拟工况下最佳重复次数的误差小于5％，验证了拖拉机耐久性加速结构试验设计方法的准确性，合理性和有效性。