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针对振动压路机机械有级调幅机构存在传动冲击、振幅调节精度差的弱点,提出电液无级调幅机构。详述了其组成结构和运行机理,通过运动学和动力学方程建立系统的数学模型。阐述了液压系统工作原理和电气控制流程。试验结果表明,电液无级调幅机构的稳态响应误差可控制在0.04 mm范围内,系统阶跃响应的过渡时间为1.9 s,超调基本为0。电液无级调幅机构在快速性、准确性和稳定性方面均可满足振动压路机的性能要求。
Aiming at the weak point of mechanical amplitude modulation mechanism of vibratory roller with transmission impact and poor amplitude adjustment accuracy, a electro-hydraulic stepless amplitude modulation mechanism is proposed. The structure and operation mechanism of the system are described in detail. The mathematical model of the system is established through kinematics and dynamics equations. Describes the hydraulic system working principle and electrical control process. The experimental results show that the steady-state response error of the electro-hydraulic stepless amplitude modulation mechanism can be controlled in the range of 0.04 mm, the transition time of the system step response is 1.9 s, and the overshoot is almost zero. Electro-hydraulic stepless amplitude modulation agencies in the fast, accuracy and stability can meet the performance requirements of vibratory roller.