Multi-Axis Vibration Testing of Spacecraft Structures - Recent Experiences and Prospects -.

Abstract

This paper deals with the employment of hydraulic multi-axis vibration simulators for dynamic qualification of large spacecraft structures in the lower frequency range. Potential advantages of such facilities are discussed considering single-axis and multi-axis test philosophies. A multi-axis transient test concept, currently under discussion among European space industries, is addressed, and some initial results of related studies are presented. They illustrate both, the capability and the practical limitations of current facilities, employed to experimentally simulate transient flight loads. Recent developments, aimed at improving the control systems of hydraulic shakers with regard to specific requirements of potential users in the aerospace field, are expected to further augment the interest in this type of vibration test facility as a versatile tool for qualification testing as well as for experimental system identification.