一、前言关于可靠性问题已有很多的讨论。如何提高产品的可靠性,已成为当前我厂设计和生产中的主要课题。但是可靠性问题并不是一个抽象的定性的概念,而应该是一个具体的定量的概念。因此,愈来愈多的人研究可靠性,研究可靠性评价,研究提高可靠性的途径。要提高可靠性,首先必须要能正确评价可靠性。在设计中经常遇到方案和结构的选择 I. Preface There has been a lot of discussion on reliability issues. How to improve the reliability of products has become the main issue in the design and production of our factory at present. But the reliability problem is not an abstract and qualitative concept, but a concrete and quantitative concept. Therefore, more and more people study the reliability, research the reliability evaluation, and study the ways to improve the reliability. To improve reliability, we must first be able to correctly evaluate the reliability. In the design often encountered in the program and structure of choice