【摘要】 为了减少拖拉机颠簸对搅浆平地机作业性能的影响，本文在两者之间添加了被动隔振系统。通过田间试验获取隔振系统的振动数据，分析了地面作用对隔振系统工作的影响。建立了搅浆平地机与水田土壤接触的隔振系统模型，基于加速度频域积分与最小二乘法辨识了该模型的参数，优化了隔振系统的刚度。结果表明：在地面作用下，隔振系统的固有频率增加了8.5%,静扰度和有效隔振频率分别减小了0.02 m和6.4%;辨识出隔振系统等效阻尼系数为12 329 N·s/m,土壤作用的等效刚度系数和等效阻尼系数分别为11 560 N/m和3 129 N·s/m;确定了优化后隔振系统的刚度为59 253 N/m,能够有效隔离9 Hz以上的振动，理论响应位移和响应加速度的均方根分别降低29.1%和58.4%。更多还原

【Abstract】 Aiming to reduce the impact of tractor jolts on the operating performance of the paddy field puddling and leveling machine, a passive vibration isolation system was added between them. The vibration data of the vibration isolation system were obtained through field experiments, and the effects of ground interaction on the system’s performance were analyzed. To obtain the interaction relationship between the vibration isolation system and the ground, a vibration isolation system model for the interaction between the puddling and leveling machine and paddy field soil was established. To establish a complete model of the vibraiton isolation system, frequency domain integration of acceleration and the least squares method were used to identify the model parameters. In addition, the stiffness of the passive vibration isolation system was optimized based on the vibration isolation system model in contact with the soil. The results showed that due to ground interaction, the natural frequency of the vibration isolation system was increased by 8.5%, whereas the static deflection and the effective isolation frequency were reduced by 0.02 m and 6.4%, respectively. The identified parameters included an equivalent damping coefficient of 12 329 N·s/m for the vibration isolation system, and equivalent stiffness and damping coefficients of 11 560 N/m and 3 129 N·s/m for the soil. The appropriate stiffness for the isolation system was determined to be 59 253 N/m, which effectively isolated vibrations above 9 Hz. Under this condition, the RMS of the system’s displacement and acceleration responses were reduced by 29.1% and 58.4%, respectively.更多还原