热与结构相互作用对带有多个间隙感应接头的重型机械压力机非线性行为的影响

IF 2.6 2区 工程技术 Q2 MECHANICS
Xuze Wu, Yu Sun, Wen Liu, Yu Chen, Ruoda Wang, Yi Qiao, Yu Wang
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引用次数: 0

摘要

热弹性流体力学(TEHD)效应对改善机械压力机的动态行为有很大帮助,尤其是在高速、重载和高温的复杂条件下。本研究提出了一种新型混合 TEHD 模型和多物理场问题的数值算法,用于预测机械压力机的非线性行为(考虑到多个间隙引起的接头)。提出的润滑原理包括接触事件引起的热效应以及 TEHD 在复杂润滑条件下对间隙尺寸的影响。采用等效节点力法统一处理间隙接头的弹性变形和热变形。在引入非守恒力的情况下,分别采用拉格朗日法和 Newmark- (beta)积分算法建立并求解了系统的动态模型。考虑到不同的流体粘度和曲柄速度,进行了数值模拟,以研究机械压力机在各种润滑条件下的非线性行为。结果表明了摩擦接触对轴承热特性的重要影响。与传动部件的弹性变形效应相比,系统位置精度的变化主要受混合润滑接头的动力学影响。此外,还进行了实验研究以验证数值结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thermal-structure interactions on the nonlinear behavior of the heavy-load mechanical press with multiple clearance-induced joints

Thermal-structure interactions on the nonlinear behavior of the heavy-load mechanical press with multiple clearance-induced joints

The thermal elastohydrodynamic (TEHD) effect contributes significantly to the improvement of dynamic behavior of mechanical presses, especially under the complex conditions of high speed, heavy load, and high temperature. In this work, a novel mixed-TEHD model and the numerical algorithm for the multiphysics problem are proposed to predict the nonlinear behavior of the mechanical press considering multiple clearance-induced joints. The propounded lubrication principle includes the thermal effects caused by contact event and the influence of TEHD on the clearance dimension under complex lubrication conditions. The equivalent nodal force method is adapted as the unified treatment of elastic and thermal deformation in the clearance joints. With the introduction of non-conservative forces, the system’s dynamic model is formulated and solved by the Lagrange approach and Newmark-\(\beta \) integration algorithm, respectively. Numerical simulations are performed considering different fluid viscosities and crank speeds to investigate the nonlinear behavior of the mechanical press under various lubrication conditions. The results demonstrate the significance of frictional contact on the bearing thermal characteristics. Compared to the elastic deformation effect of transmission components, the variation of system position accuracy is primarily governed by the dynamics of mixed-lubricated joints. Furthermore, experimental studies are performed to validate the numerical findings.

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来源期刊
CiteScore
6.00
自引率
17.60%
发文量
46
审稿时长
12 months
期刊介绍: The journal Multibody System Dynamics treats theoretical and computational methods in rigid and flexible multibody systems, their application, and the experimental procedures used to validate the theoretical foundations. The research reported addresses computational and experimental aspects and their application to classical and emerging fields in science and technology. Both development and application aspects of multibody dynamics are relevant, in particular in the fields of control, optimization, real-time simulation, parallel computation, workspace and path planning, reliability, and durability. The journal also publishes articles covering application fields such as vehicle dynamics, aerospace technology, robotics and mechatronics, machine dynamics, crashworthiness, biomechanics, artificial intelligence, and system identification if they involve or contribute to the field of Multibody System Dynamics.
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