中文摘要：

讨论了一类含未知参数的非线性系统的自适应无源化问题．通过引入切换拓宽可反馈无源化对象的范围，在控制项前面的系数是未知参数线性函数的条件下构造出自适应无源反馈规律．在该条件不满足时，基于无源性分析给出了鲁棒自适应控制器，可以保证闭环系统是全局渐近稳定的．仿真结果表明了所提出算法的有效性．

英文摘要：

Adaptive passivation for a class of nonlinear systems with unknown parameter is discussed. The range of the systems which can be passivated is enlarged by using switching control. Adaptive feedback controllers that render the closed systems passivation are constructed under the condition that the unknown parameters enter linearly into the coefficient of the control item. Robust adaptive controllers are given based on passive system theory, which guarantee the closed system is global asymptotic stable. Simulation example results show the effectiveness of the proposed approach.