悬臂板结构多点激励系统及地面颤振模拟技术

Multi-point excitation system of cantilever plate structure and ground flutter simulation technology

摘要

地面颤振试验是一种新的结构颤振研究方法，通过将连续分布的气动力降阶为若干集中力，并采用激振器进行加载，从而实现对结构颤振响应的模拟。为研究悬臂板结构在给定风速下的地面颤振响应模拟技术，构建了基于悬臂板结构的多点激励系统的理论模型；针对超声速环境下的结构颤振分析，采用活塞理论建立了悬臂板气动模型；针对多点激励系统各通道之间的耦合问题，采用前置反馈方法实现了对悬臂板-激振器多点激励系统的解耦控制；最后，基于所提出的理论模型搭建了试验平台。分析结果表明，所建立的悬臂板地面颤振模拟试验系统在不同的马赫数下能够完成对结构响应的模拟，试验结果与理论计算结果非常吻合。对于马赫数为4.3和4.5的工况，试验结果与仿真结果的误差小于2.5%。

Abstract

Ground flutter test is a novel approach for structural flutter investigation，in which the continuously distributed aerodynamic forces are reduced to a set of discrete concentrated forces and applied through shakers，thereby enabling the simulation of the structural flutter response. To study the ground flutter response simulation technology of a cantilever plate structure at a given flow speed，a theoretical model of a multi-point excitation system based on the cantilever plate structure was developed. For flutter analysis in a supersonic environment，the aerodynamic model of the cantilever plate was established using the piston theory. To address the coupling between different channels of the multi-point excitation system，a pre-feedback method was employed to achieve decoupled control of the cantilever plate-shaker multi-point excitation system. Finally，an experimental platform was constructed based on the proposed theoretical model. The analysis results indicate that the developed cantilever plate ground flutter simulation test system can reproduce the structural response at different Mach numbers，with the experimental results showing very good agreement with the theoretical predictions. For the cases with Mach numbers of 4.3 and 4.5，the discrepancies between the experimental and numerical results are less than 2.5%.

关键词

地面颤振试验 / 多点激励系统 / 悬臂板 / 解耦控制 / PID控制

Key words

ground flutter test / multi-point excitation system / cantilever plate / decoupling control / PID control

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基金资助

国家自然科学基金资助项目(12202116)

黑龙江省自然科学基金资助项目(LH2023A003)