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Development of Shock and Vibration Test Specifications For Telecommunications Equipment in Automotive Environments.


This paper presents the results of programme of work undertaken by VTT and Nokia Research in Finland. The document is a 14 page paper generated in 2001.

Results from the development of shock and vibration test specifications for telecommunication equipment on the basis of field measurements are presented. Telecommunication products can be installed into various locations in vehicles. Thus, the measurements were conducted from several possible mounting locations. Five different telecommunication equipment was studied. In addition, various road types and situations giving different impact loads were studied. On the basis of the provided life cycle profiles the measured environmental conditions were combined and test acceleration was used in order to obtain the final shock and vibration test requirements.

Telecommunication equipment is exposed to significant shock and vibration loads in automotive environment. Examples for representative test levels can be found in handbooks and standards (IEC 60721-3-5 (1997), ETS 300-019-1-5 (1992) ). In addition, vehicle manufacturers may provide more specific test requirements. However, telecommunication products may be installed into different locations with different mounting systems in vehicles and therefore vibration and shock environmental conditions can change significantly for even similar products. Therefore, it may be necessary to study the shock and vibration levels in actual field conditions and to use this knowledge for the generation of more accurate and optimized test procedures. This process is often called environmental test tailoring. At the same time, in addition to improve testing, the measured data can be used for improving equipment and mounting system design.

In the work presented in this paper the main objective was to generate shock and vibration test specifications for telecommunication equipment in automotive environment with the use of field measurements and environmental test tailoring. In addition, the test tailoring process itself is studied. The produced test requirements represent the estimated total life cycle load, i.e. amount of shock and vibration loads that the product experiences during its life time. Furthermore, the tests are accelerated in order to reduce testing time and costs.

The conducted work is connected to research program MERA (Mechanical Stresses in Equipment Design) which is part of Finnish National Research Program ETX.

CEEES is a confederation of the environmental engineering societies of

the United Kingdom (SEE),
France (ASTE),
Germany (GUS),
Sweden (SEES),
Switzerland (SSEE),
Finland (KOTEL),
Belgium (BSMEE),
the Netherlands (PLOT),
Italy (AITPA),
Czech Republic (NACEI)
Austria (ÖGUS)
Portugal (SOPSAR)