一類非匹配不確定純反饋非線性系統(tǒng)新型變冪次趨近律滑?刂
[Abstract]:A sliding mode control method based on variable power law is proposed to solve the output problem of a class of non-matching uncertain pure feedback nonlinear systems represented by (gas metal arc welding-GMAW. First, the first order derivative of the system with mismatched uncertainties is obtained by using the sliding mode differentiator. Due to the finite-time stability of the terminal sliding mode, the proposed method has the advantages of high estimation accuracy and fast convergence rate of estimation error. Then, a new variable power law is proposed, and it is proved that under the same gain, the speed of approach is faster than that of existing laws, and it has the ability to adjust the speed of approach adaptively. It can not only ensure that the trajectory of the system approaches the sliding mode surface in finite time in the global range, but also avoid the chattering near the sliding mode surface. Finally, the arc length in GMAW with mismatched disturbance is simulated by using variable power law sliding mode variable structure control method and traditional approach law sliding mode variable structure control method. The tracking effect of arc length is compared and the steady-state error is analyzed. The results show that the variable power law sliding mode variable structure method can effectively improve the rapidity of the system convergence, and the sliding mode control method is robust to the nonlinear system with unmatched uncertainties.
【作者單位】: 四川大學(xué)電氣信息學(xué)院;
【基金】:中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助(20826041A4133)
【分類號(hào)】:TP273
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