考虑打滑现象的振动压路机振动轮的滞回响应特性研究

发布时间：2018-09-06 19:31

【摘要】：水平振动压实下土壤的滞回恢复力与位移呈现对称滞回特性,考虑土壤的密实度较高时振动轮在土壤面层发生脱耦打滑现象,采用双线性对称滞回模型建立分段的二自由度振动压路机动力学方程,在一次近似前提下,利用谐波线性法将非线性作用力线性化为等效刚度和等效阻尼。通过数值仿真研究振动轮在水平激振下非线性滞回响应特性。结果表明:在对称滞回力的作用下,振动轮发生超谐波共振,频谱呈现以基波为主,仅含明显的高奇次倍谐波特性。随土壤密实度的增大,振动轮频谱呈现明显的偶次倍和分数倍谐波成分,标志打滑的发生,一定条件下振动轮进入复杂的拟周期运动。合理调整激振参量,可在一定程度下抑制打滑,使得振动轮维持稳定的倍周期运动。
[Abstract]:The hysteretic restoring force and displacement of the soil under horizontal vibration compaction show symmetrical hysteretic characteristics. Considering the high compactness of the soil, the vibration wheel occurs decoupling and slipping in the soil surface. The dynamic equations of two-degree-of-freedom vibratory roller are established by using a bilinear symmetric hysteretic model. On the premise of first order approximation, the nonlinear force is linearized into equivalent stiffness and damping by harmonic linear method. The nonlinear hysteretic response of the vibration wheel under horizontal excitation is studied by numerical simulation. The results show that the vibration wheel has super harmonic resonance under the action of symmetrical hysteretic return force, and the frequency spectrum is dominated by fundamental wave, which contains only the characteristic of high odd order harmonic. With the increase of soil compactness, the frequency spectrum of vibration wheel presents significant harmonic components of even and fractional times, indicating the occurrence of slip, and the vibration wheel enters into complex quasi-periodic motion under certain conditions. By adjusting the excitation parameters reasonably, the sliding can be restrained to a certain extent, and the vibration wheel can maintain a stable periodic motion.
【作者单位】：福建农林大学机电工程学院;福州大学机械工程及自动化学院;
【基金】：国家自然科学基金项目(51175086) 福建省自然科学基金资助项目(2013J01171)
【分类号】：U415.521

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