Purpose

The purpose of this study is to develop a normal contact stiffness (NCS) model among three disks of the assembled rotor system, which systematically considers the friction coefficient, the asperities interaction and the elastoplastic contact regime.

Design/methodology/approach

Based on the revised fractal theory, considering the friction effect, the elastoplastic contact regime and the asperities interaction in a simple way, the total NCS among three disks of the rod-fastening rotor bearing system is established. Effects of fractal dimension and roughness, friction coefficient, asperities interaction and material properties on the normal stiffness are investigated by simulations and the relevant comparisons are given for examining the reasonability of the proposed model.

Findings

NCS will decrease when asperities interaction and friction are included. As the load increases, the influences of asperities interaction and friction on stiffness become serious. NCS will be enhanced when the elastoplastic regime is considered.

Originality/value

A comprehensive NCS model is developed. It provides a theoretical basis for the modeling of the NCS for multi-interfaces.

中文翻译：

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考虑摩擦和凹凸相互作用的紧固杆转子系统三盘间法向分形接触刚度模型

目的

本研究的目的是开发组装转子系统的三个盘之间的法向接触刚度 (NCS) 模型，该模型系统地考虑了摩擦系数、凹凸相互作用和弹塑性接触状态。

设计/方法/方法

基于修正的分形理论，简单地考虑摩擦效应、弹塑性接触方式和凹凸不平相互作用，建立了杆紧固转子轴承系统三个盘之间的总NCS。通过仿真研究了分形维数和粗糙度、摩擦系数、粗糙相互作用和材料特性对法向刚度的影响，并给出了相关比较，以检验所提出模型的合理性。

发现

当包括粗糙相互作用和摩擦时，NCS 将减少。随着载荷的增加，凹凸相互作用和摩擦对刚度的影响变得严重。当考虑弹塑性机制时，NCS 将得到增强。

原创性/价值

开发了一个综合的 NCS 模型。为多接口的NCS建模提供了理论依据。