According to the failure site data of the well pumping unit in active service, its life statistical model is determined and the service reliability is evaluated quantitatively.
由在役抽油机故障的现场数据来判定其寿命统计模型，实现对抽油机使用可靠性的定量评定。
Static analysis of Model LCJ1250 chain pumping unit indicates that the rather low reliability of the unit is due to the premature failure of the path chain caused by the action of lateral bending.
对LCJ1250链条抽油机的静力学分析与计算表明，由于轨迹链条承受侧向弯曲作用而早期失效，造成抽油机可靠性低。
The relation model of failure modes and characters of the unit under test (UUT) is created. The general adequacy criterion for the sample set is proposed according to the relation model.
建立了故障模式与被测单元(UUT)特性之间的关系模型，根据关系模型建立了样本集的通用充分性准则。
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