Using Computer Technique for Developing Method for Vibration Damage Estimation Under Combined Random and Deterministic Loading

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-12-01 DOI:10.2478/ama-2023-0065

Michał Ptak, Jerzy Czmochowski

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Abstract

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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利用计算机技术开发随机和确定性组合载荷下的振动损伤估算方法

摘要本文的重点是为军用直升机、战斗机和其他承受随机和确定性组合载荷的飞机开发一种新的振动损伤评估方法。第一阶段的研究重点是频域损伤预测，这是由 Bishop 提出并由 Sweitzer、Schlesinger、Woodward、Kerr、Murthy、Datta 和 Atkins 开发的传统方法。上述基于频域的方法已在 MSC CAE Fatigue 等商业软件中使用。频域损伤预测是基于频域中的谱矩叠加和雨流周期计数算法的 Dirlik 方法。第一阶段的研究表明，基于传递函数的传统算法是在 Abaqus 环境中使用有限元法（FEM）开发的，非常保守。第二阶段的研究旨在开发一种新方法，以实现更稳健、更准确的损坏估计。为此，采用了蒙特卡罗方法，从频域信号中检索时域随机信号。为获得系统传递函数，使用有限元分析获得了 1 g 负载谐波系统响应。随后，通过随机加载的 PSD 输入曲线和确定性加载的正弦波或正弦扫频函数对其进行线性缩放，以计算线性系统的累积系统响应。这项研究在对线性系统进行有效频域有限元分析的基础上，利用时域和频域相结合的方法，开发出一种精确估算振动损伤的新方法。考虑到实际测试中使用的信号削波和频率分辨率，所提出的新方法还可用于精确复制测试条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.