The NASA/Industry Design Analysis Methods for Vibrations (DAMVIBS) Program - Accomplishments and Contributions

A NASA Langley-sponsored rotorcraft structural dynamics program known as DAMVIBS (Design Analysis Methods for VIBrationS) with the objective of establishing the technology base needed by the industry for developing an advanced finite-element-based dynamics design analysis capability for vibrations has been underway since 1984. Under the program, teams from the four major helicopter manufacturers have formed finite-element models, conducted ground vibration tests, and made test/analysis comparisons of both metal and composite airframes, performed "difficult components" studies on airframes to identify components which need more complete finite-element representation for improved correlation, and evaluated industry codes for computing coupled rotor-airframe vibrations. Studies aimed at establishing the role that structural optimization can play in airframe vibrations design work have also been initiated. Five government/industry meetings have been held in connection with these activities during the course of the program. Because the DAMVIBS Program is coming to an end, the fifth meeting included a brief assessment of the program and its benefits to the industry. The assessment indicated that the DAMVIBS Program has resulted in notable technical achievements and changes in industrial design practice, all of which have significantly advanced the industry's capability to use and rely on finite-element-based dynamics analyses during the design process. The purpose of this paper is to present a summary of the major accomplishments and contributions which may be ascribed to the program.