RESEARCH PAPER
Using Computer Technique for Developing Method for Vibration Damage Estimation Under Combined Random and Deterministic Loading
1
Department of Machine Design and Research, Wroclaw University of Technology and Science, ul. Ignacego Łukasiewicza 7/9, 50-371 , Wrocław, Poland
Submission date: 2023-03-23
Acceptance date: 2023-06-16
Online publication date: 2023-12-30
Publication date: 2023-12-01
Acta Mechanica et Automatica 2023;17(4):558-569
KEYWORDS
vibration damagerandom vibrationFEMMonte Carlo methodfrequencytime domain Rainflow Cycle Counting algorithms
ABSTRACT
This paper is focusses on developing a novel method for vibration damage estimation for military helicopters, fighter aircrafts and any other aircraft exposed to combined stochastic and deterministic loading. The first stage of the research focused on frequency domain damage prediction, which is the legacy method proposed by Bishop and developed by Sweitzer, Schlesinger, Woodward, Kerr, Murthy, Datta and, Atkins. The mentioned frequency domain-based method is used in commercial software, e.g., MSC CAE Fatigue. Frequency domain damage prediction is based on superposition of spectral moments and Dirlik method of Rainflow Cycle Counting algorithm in frequency domain. The first phase of the research showed the legacy algorithm based on transfer function developed using FEM (Finite Element Method) method in Abaqus environment and is very conservative. The second stage of the research aims to develop a novel method which allowing for more robust and accurate damage estimation. For this purpose, the Monte Carlo method for retrieving random signal in the time domain from signal in frequency domain was used. To obtain the system transfer function, – the 1 g load harmonic system response was obtained using FEM analysis. It was subsequently scaled linearly by the PSD input curve for random loading and sine wave, or sine sweep function for deterministic loading to calculate the cumulative system response of the linear system. The research allows the development of a novel method to precisely estimate vibration damage using combined time and frequency domains approach, based on effective frequency domain FEM analysis of the linear system. The new proposed method can be also used for precise replication of test conditions via considering signal clipping and frequency resolution used for real testing.
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