基于 Neum an故障源 ,建立一种新的故障源模型 ,即具有实输入数组的故障源模型 (简称实故障源 )。利用概率分析方法研究在实故障源作用下 ,由函数单元构成的控制系统的可靠性 ,并给出了系统不可靠度的下界估计。可靠性估计定理给出的下限值可作为工程实践中很有价值的参考点。 Based on Neum an fault source, a new fault source model is established, that is, a fault source model with real input array (referred to as real fault source). Using the probability analysis method, the reliability of the control system composed of functional elements under the action of real fault sources is studied. The lower bound of the unreliability of the system is given. The lower limit value given by the reliability estimation theorem can be used as a valuable reference point in engineering practice.