ISSN:0748-8017    

DOI:10.1002/qre.4680100102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractIn destructive stress testing, industrial quality control, or other situations, data may consist only of record setting values, such as successive values that are smaller than all previous ones observed. Here, for a two‐parameter Weibull distribution, the performance of the maximum likelihood estimators (MLEs) from record‐breaking data is studied by computer simulations. Comparison of the biases and mean squared errors of these estimators with those of the MLEs for complete samples from the Weibull distribution is discussed and some examples are presen

ISSN:0748-8017    

DOI:10.1002/qre.4680100105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractA new technique for reliability and quality optimization of electronic components and assemblies, the so calledin situaccelerated ageing technique with electrical testing, is presented. This technique is extremely useful for the building‐in approach to quality and reliability. First, it can be used to optimize an electronic component or assembly with respect to its quality and reliability performance at a very early stage, i.e. at the design level, at the level of materials selection, and at the level of identifying production techniques and defining production parameters. The typical test time is of the order of 24 hours, which is sufficiently short to allow a design of experiments type approach to quality and reliability optimization. Furthermore, the technique is also very useful for obtaining a deeper understanding of the physico‐chemical processes which lead to failure. A number of practical examples where the technique has been successfully applied are discus

ISSN:0748-8017    

DOI:10.1002/qre.4680100106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper provides a general approach for determining tolerances for machined parts which minimizes the combined machining cost and quality cost. We derive a mathematical model which takes into consideration both machining cost and quality cost, which depend on tolerance specifications and the distribution of the machined part dimension produced by a chosen machining process. The model represents the quality cost with a loss function and represents the machining cost with a fitted curve based on some original data. The distribution of the machined part characteristic is taken to be either normal or triangular, depending on model assumptions. By applying this model, designers can determine the tolerance which provides the minimum expected total cost.

ISSN:0748-8017    

DOI:10.1002/qre.4680100107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractWith repairable systems, it is suspected than many of the post‐failure repairs have the effect of partially resetting the failure rate of the system. Consequently, identifying the correct failure model and its associated parameters is confounded by the impact of these repair effects. The purpose of this paper is to compare the use of several simulation strategies involving mimicking experiments, to assist in this identification process. Data collected from a hydrelectric turbine unit is used to illustrate the approac

ISSN:0748-8017    

DOI:10.1002/qre.4680100108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThe major concern of this paper is to provide a review of the use of SPC techniques in batch production. Data transformation is considered as one of the most important activities when implementing SPC in such an environment. Other activities include focusing attention on the process rather than on the product and the use of standardized control charts (SCCs) in place of traditional charts. Aspects of data transformation are dealt with especially with regard to explaining the mechanism of data transformation and selecting as well as evaluating several transformation techniques. In addition, a method of sensitivity analysis for SCCs is also included.

ISSN:0748-8017    

DOI:10.1002/qre.4680100109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper describes three types of high voltage power transistors that are in widespread use in the electronics industry today, and their susceptibility to reverse‐biased second breakdown while switching unclamped inductive loads. It provides a brief explanation of the phenomenon of second breakdown in transistors under both forward‐biased and reverse‐biased conditions. It describes a stress circuit that has been developed to incorporate switching of unclamped inductive loads as an integral part of operational life testing. A case history incorporating this technique is presented for the 2SD1739 high voltageNPNbipolar power trans

ISSN:0748-8017    

DOI:10.1002/qre.4680100110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractReliability demonstration tests frequently require large sample sizes which are objectionable from both a cost and time standpoint. The approach presented, referred to as bias sampling, offers a means to demonstrate conformance to reliability objectives with reduced test samples and test time. The reduction is achieved by selection and test of samples from the lower‐median sub‐population of a random sample. The prediction assumes that the entire population of samples was tested. Rationale for the approach is presented along with guidelines for sample selection. Two application examples illustrate how the methodology is being employed at Chrysler Corporat

ISSN:0748-8017    

DOI:10.1002/qre.4680100111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY