中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2014年
11期
1530-1534
,共5页
垂直激振%弹塑性变形%不对称滞回模型%跳振%混沌
垂直激振%彈塑性變形%不對稱滯迴模型%跳振%混沌
수직격진%탄소성변형%불대칭체회모형%도진%혼돈
vertical excitation%elastic-plastic deformation%asymmetric hysteresis model%j ump vibration%chaos
振动压实下土壤滞回恢复力与位移呈现不对称滞回特性，考虑土壤密实度较高时振动轮易发生跳振现象，建立了基于土壤特性参数的不对称滞回模型，一次近似的前提下，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，对压实系统振动轮的非线性滞回特性进行了研究。结果表明：压实初期土壤处于弹塑性变形阶段，振动轮产生超谐波共振；压实中后期随着压实土壤的不断密实，振动轮产生亚谐波共振，标志着跳振的发生，一定条件下进入混沌状态；合理调整激振力和激振频率可以有效地抑制跳振，避免混沌运动。
振動壓實下土壤滯迴恢複力與位移呈現不對稱滯迴特性，攷慮土壤密實度較高時振動輪易髮生跳振現象，建立瞭基于土壤特性參數的不對稱滯迴模型，一次近似的前提下，利用諧波線性法將非線性作用力線性化為等效剛度和等效阻尼。通過數值倣真，對壓實繫統振動輪的非線性滯迴特性進行瞭研究。結果錶明：壓實初期土壤處于彈塑性變形階段，振動輪產生超諧波共振；壓實中後期隨著壓實土壤的不斷密實，振動輪產生亞諧波共振，標誌著跳振的髮生，一定條件下進入混沌狀態；閤理調整激振力和激振頻率可以有效地抑製跳振，避免混沌運動。
진동압실하토양체회회복력여위이정현불대칭체회특성，고필토양밀실도교고시진동륜역발생도진현상，건립료기우토양특성삼수적불대칭체회모형，일차근사적전제하，이용해파선성법장비선성작용력선성화위등효강도화등효조니。통과수치방진，대압실계통진동륜적비선성체회특성진행료연구。결과표명：압실초기토양처우탄소성변형계단，진동륜산생초해파공진；압실중후기수착압실토양적불단밀실，진동륜산생아해파공진，표지착도진적발생，일정조건하진입혼돈상태；합리조정격진력화격진빈솔가이유효지억제도진，피면혼돈운동。
The resilience against displacement revealed asymmetrical hysteresis during the vibrato-ry compaction.As the soil compactness was high enough,the j ump vibration of vibration roller was produced.An asymmetric hysteresis model was established in terms of segmental line according to soil property parameters.According to the first order approximation,the equivalent damping coeffi-cient and equivalent stiffness coefficient were deduced through the harmonic linearization method.By means of numerical simulation,the hysteresis response characteristics of the drum were analyzed. During the beginning of vibration compaction,soil presents elastic-plastic characteristics and super-harmonics occur.With the increase of soil density during the ending of vibratory compaction,sub-harmonics may occur,which marks the occurrence of j ump vibration.Under some conditions,chaos can be induced.Adj ustment of excitation amplitude and excitation frequency can availably restrain j ump vibration and chaos motion of the drum.
