Sammendrag
As part of production assurance and reliability management, particularly in the engineering phase, reliability testing can be carried out to obtain relevant information related to the system performance. The testing represents a type of physical examination of the item, where the required level of reliability is to be demonstrated for the relevant environment and lifetime. For some items, an accelerated testing is required to obtain this information, as the failure characteristics might not be revealed from regular reliability life testing. However, as noted in the international standard ISO 20815:2018 on production assurance and reliability management, the obtained information could sometimes be misleading. One should be careful when using information from the reliability tests, as the test requirements are often misunderstood, and it could be difficult to apply these consistently in planning and execution; for example, from qualification testing. Hence, to achieve useful information, it is important to handle uncertainties in an appropriate way.
In this paper, we discuss the claim above, particularly why it is important to capture the uncertainties for the different types of reliability tests, within the context of ISO 20815:2018. Focus is on the reporting and usefulness of the test results. A common finding to several types of reliability tests is that there are different ways of interpreting and using the requirements, which strongly influence both assumptions made and the conclusions, and are thus influencing the usefulness of the information. In the paper, we give some advice on how to handle different uncertainty aspects in the test reporting and in use in a production assurance and reliability management context.
Vis fullstendig beskrivelse
