Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 !., .,. GUIDANCE FOR DEVELOPMENT OF ,. LABORATORY DYNAMIC TEST SPECIFICATION APPR.IDIXA ! . A-1 . INTRODUCTION .,. ,,, ...:, Laboratory test specifications developed from test item stresses measured during actual service conditions are or may be significantly more realistic than the standard laboratory specifications contained.Ln the dynamic test procedures of this standard. This is generally true even when compromise is made due to unavailability of prototypes, lack of definition of’service scenarios, or limited measured service stress data.
All possible effort should be made to develop realistic laboratory test specifications. Seqvice scenarios ehould be estimated and ballast loads used to obtain field data for interim criteria. It is imperative that the interim criteria be updated’as prototypes and additional data and information become available. ,. In the development of laboratory test specifications, the effort must be planned since each step in the process affects all other steps. Factora such as cost, sample eizes, test facilities,’conduct of test’,and.pass-fail criteria must be considered. Detailed procedures, including assumptions, approximations, and supporting rationale, should be fully documented.
The degree of accuracy should be consistent throughout the specification de- velopment, teat program, and evaluation of resulta. While technical.analysis is a valuable tool, sound judgment is the basis of quality.in testing. A-2. GENERAL PROCEDURES The procedures for development of a laboratory dynamic test .specifi”cationcan I be generalized as follows: I a. Define service scenarioa in standard. ,, accordance with s e c t i on 4 of this b. Obtain representative field stress data.’ c. Estimate the fragility of the item relative This information is used to: to the service conditions. (1) Reevaluate the decision to conduct the test.
(2) Determine the degree of accuracy required for the apecification . development. (3) Predict critical frequencies and establish a hierarchy with respect to frequency. . traneient) for processing by METHOD 514.3 APPENDIX A d. Develop a failure model for potential use laboratory teat. in the time scaling of the ,, :, e. Separate.types of data (periodic, randOm, individual techniques.’ 19 July lg83 514.3-76 .