Full-scale static test of small composite aircraft

Abstract

This paper addresses the accuracy of test load application and reaction prediction of aircraft full-scale static test. Factors which have an effect on the accuracy of load application have been identified. An effective procedure for installing test article and actuators is proposed to achieve accurate loading direction compared to conventional one. A method to define quality of load control for a full-scale static test is suggested by using root mean square deviation (RMSD) of command-feedback (CMF) values. Test result of U1 test condition for the KC-100 full-scale static test has shown 8.7 N of averaged RMSD value. At the end, an approach to make general equation for reaction to load increment has been presented and reaction can be assumed to have relation of linear to load increment for symmetric load condition. The linear behavior has been shown through a test data of the KC-100 aircraft which has high stiffness of composite material structure. The test result presents that the linear behavior of the reaction has been well corresponding to the linear model.

Keywords:

• full-scale static test
• KC-100
• test system
• test frame
• test load control error
• reaction load
• restraint system
• root mean square deviation (RMSD)
• command-feedback (CMF)