为保证播种深度稳定,提高播种质量,通过对加装两种不同仿形加载机构的免耕播种机开沟深度和弹簧形变量时域分析,建立了传递函数.作业速度为5 km·h-1时,新型仿形加载机构的弹簧形变量均值与变异系数分别为0.26 cm、38.5%,验证了免耕播种机系统为欠阻尼衰减振动系统,阻尼比为0.62;系统响应时间与最大超调量比原仿形加载机构分别减少18%、32%,其结果比原仿形加载机构系统平稳性好,有利于免耕播种机开沟深度稳定.%In northeast ridge-zone of China,the temperature is low,and wind erosion and spring drought occurred seriously.Maize planting proposed higher requirements for the performance of no-till planter.In order to ensure the sta-bility of sowing depth and improve sowing quality,the transfer function of new profile loading mechanism was established by analyzing the time of sowing depth and spring deformation of no-tillage sowing with two different loading mechanisms. The spring deformation variable mean value and variance coefficient are 0.26 cm and 38.5%,respectively,when the working speed is 5 km·h-1,and the damping ratio of the system is less than 0.62.Response time and maximum over-shoot were reduced by 18% and 32%,respectively.The result is better than that of original profile loading system, which is favorable to the trench depth stability of no-till planter.
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