Accelerated Vibration Testing Based on Fatigue （加速振动测试基于疲劳）.pdf

ACCELERATED VIBRATION TESTING BASED ON FATIGUE DAMAGE SPECTRA Dr. A Halfpenny nCode International, 230 Woodbourn Road, Sheffield S9 3LQ, UK ABSTRACT Failure of an aerospace component can arise through the long term exposure to fatigue damaging events such as large numbers of low amplitude random events and/or relatively fewer high amplitude events. Mission profiling and test synthesis is a process for deriving a simple laboratory test that has at least the same damage potential as the real environment but in a fraction of the real time. In this paper we introduce the technical concepts and present a case study showing how new technology has dramatically reduced the time it takes to prepare and reduce the original test data. KEYWORDS Fatigue Damage Spectrum, Mission Profiling, Test Synthesis, Shock Response Spectrum, Extreme Response Spectrum, Accelerated Vibration Test INTRODUCTION A successful durability rig test should satisfy the following criteria:- 1. The test must be suitable for the item in question, be that a single component, sub-assembly or airframe. 2. The test must replicate the same failure mechanisms observed in the real loading environment. 3. The test should be representative of the real loading environment within known statistical margins. 4. The test should be accelerated where possible to improve development schedules and reduce cost; however, it should not incur unrealistically high loads that might alter the failure mechanism. 5. The test specification should be suitable for laboratory based testing and Finite Element (FE) based analysis. In this paper we are interested in vibration testing emplo