輸送變速流體之管樑的主動振動制抑

Active Vibration Suppression of Pipes Conveying Fluids with Time-varying Flowing Speeds

林益煌(Y. H. Lin) ； 何建毅(C. Y. Ho)

《中華民國振動與噪音工程學會論文集》 1998 (1998/05) Pp. 89-98

https://doi.org/10.30028/CSSVANNUAL.199805.0089

摘要

本研究之目的主要是探討探結構因輸送變速流體引致振動之動態分析及控制。文中將先由系統之運動特性。建立變速流體之有限元素換型，在振動控制方面，採用參考模型之適應控制(Modal Reference Adaptive Control, MRAC)方式。探結構於輸送變速流體時，在臨界流速之前亦可能會產生顫振(flutter)之現象。本研究將以MRAC方式抑制此現象之發生，並顯示MRAC於平均流速及流體脈動頻率變化時，仍有極佳之振動控制效能。文中提供一數值算例。以分析變速流體之平均流速在臨界流速以下之管樑振動控制特性，以對此一控制系統提供控制設計上之參考。

並列摘要

This study investigates the dynamic behavior and control of pipes conveying fluids with lime-varying flow speeds. The model reference adaptive control (MRAC) approach s applied for vibration control of the dynamic system. For a pipe conveying fluids with time-varying flow speeds, flutter exists even when the mean flow speed is below the traditional critical speed. The MRAC approach is applied to suppress the resulted flutter in this study and the approach is shown to have excellent vibration suppression performance with variations, unknown to the control system, of mean flow speed or oscillation frequency of the fluid. Numerical results are presented to demonstrate the vibration suppression characteristics of the control system with a mean flow speed below the traditional critical speed.